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+# Security Quick Wins Implementation Guide
+**Get 80% of security value with 20% of effort**
+
+**Status:** Ready to Deploy
+**Time to Implement:** 1-2 hours
+**Value:** HIGH - Immediate protection against common attacks
+
+---
+
+## What You're Getting
+
+✅ **Security Headers** - Prevents XSS, clickjacking, MIME sniffing
+✅ **Input Validation** - Sanitizes HTML, enforces length limits
+✅ **Rate Limiting** - Prevents brute force, DoS, spam
+✅ **CSRF Protection** - Prevents cross-site request forgery
+✅ **Security Logging** - Audit trail for all security events
+✅ **Response Sanitization** - Hides stack traces and sensitive data
+
+**What This Protects Against:**
+- Cross-Site Scripting (XSS) attacks
+- Cross-Site Request Forgery (CSRF)
+- Clickjacking
+- MIME type confusion attacks
+- Brute force authentication
+- Form spam
+- DoS attacks
+- Information disclosure
+
+---
+
+## Prerequisites
+
+### 1. Install Dependencies
+```bash
+cd /home/theflow/projects/tractatus
+
+# Install required npm packages
+npm install express-rate-limit validator csurf cookie-parser
+```
+
+### 2. Create Log Directory
+```bash
+# Create security log directory
+sudo mkdir -p /var/log/tractatus
+sudo chown -R $USER:$USER /var/log/tractatus
+sudo chmod 750 /var/log/tractatus
+```
+
+---
+
+## Step 1: Update src/server.js
+
+Add the following to your `src/server.js` file. **Insert in the order shown:**
+
+```javascript
+const express = require('express');
+const cookieParser = require('cookie-parser');
+const csrf = require('csurf');
+
+// Import security middleware
+const { securityHeadersMiddleware } = require('./middleware/security-headers.middleware');
+const { publicRateLimiter } = require('./middleware/rate-limit.middleware');
+const { sanitizeErrorResponse, sanitizeResponseData } = require('./middleware/response-sanitization.middleware');
+
+const app = express();
+
+// ============================================================
+// SECURITY MIDDLEWARE (Apply BEFORE routes)
+// ============================================================
+
+// 1. Security Headers (HIGH VALUE - 5 minutes to add)
+app.use(securityHeadersMiddleware);
+
+// 2. Cookie Parser (required for CSRF)
+app.use(cookieParser());
+
+// 3. Body Parsers
+app.use(express.json({ limit: '1mb' }));  // Payload size limit
+app.use(express.urlencoded({ extended: true, limit: '1mb' }));
+
+// 4. Response Data Sanitization
+app.use(sanitizeResponseData);
+
+// 5. Public Rate Limiting (100 req/15min per IP)
+app.use(publicRateLimiter);
+
+// 6. CSRF Protection (POST/PUT/DELETE/PATCH only)
+const csrfProtection = csrf({ cookie: true });
+app.use((req, res, next) => {
+  if (['POST', 'PUT', 'DELETE', 'PATCH'].includes(req.method)) {
+    return csrfProtection(req, res, next);
+  }
+  next();
+});
+
+// ============================================================
+// YOUR EXISTING ROUTES
+// ============================================================
+
+// CSRF token endpoint (for forms)
+app.get('/api/csrf-token', (req, res) => {
+  res.json({ csrfToken: req.csrfToken() });
+});
+
+// ... your existing routes here ...
+
+// ============================================================
+// ERROR HANDLING (Apply AFTER routes)
+// ============================================================
+
+// CSRF Error Handler
+app.use((err, req, res, next) => {
+  if (err.code === 'EBADCSRFTOKEN') {
+    return res.status(403).json({
+      error: 'Invalid CSRF token',
+      message: 'Request blocked for security reasons'
+    });
+  }
+  next(err);
+});
+
+// General Error Handler (hides stack traces in production)
+app.use(sanitizeErrorResponse);
+
+// Start server
+const PORT = process.env.PORT || 9000;
+app.listen(PORT, () => {
+  console.log(`Server running on port ${PORT}`);
+  console.log('✅ Security middleware active');
+});
+```
+
+---
+
+## Step 2: Add Form-Specific Rate Limiting
+
+For form submission endpoints (contact, cases, media inquiries), add stricter rate limiting:
+
+```javascript
+const { formRateLimiter } = require('./middleware/rate-limit.middleware');
+const { createInputValidationMiddleware } = require('./middleware/input-validation.middleware');
+
+// Example: Case submission endpoint
+app.post('/api/cases/submit',
+  formRateLimiter,  // 5 submissions/min
+  createInputValidationMiddleware({
+    title: { type: 'text', required: true, maxLength: 200 },
+    description: { type: 'text', required: true, maxLength: 5000 },
+    contact_email: { type: 'email', required: true },
+    contact_name: { type: 'text', required: true, maxLength: 100 }
+  }),
+  casesController.submitCase
+);
+
+// Example: Contact form
+app.post('/api/contact',
+  formRateLimiter,
+  createInputValidationMiddleware({
+    name: { type: 'text', required: true, maxLength: 100 },
+    email: { type: 'email', required: true },
+    message: { type: 'text', required: true, maxLength: 5000 }
+  }),
+  contactController.submitContact
+);
+```
+
+---
+
+## Step 3: Update Client-Side Forms for CSRF
+
+Add CSRF token to all forms that POST/PUT/DELETE:
+
+```javascript
+// Fetch CSRF token before form submission
+async function submitForm(formData) {
+  try {
+    // Get CSRF token
+    const tokenResponse = await fetch('/api/csrf-token');
+    const { csrfToken } = await tokenResponse.json();
+
+    // Add CSRF token to form data
+    formData.append('_csrf', csrfToken);
+
+    // Submit form
+    const response = await fetch('/api/cases/submit', {
+      method: 'POST',
+      body: formData
+    });
+
+    if (!response.ok) {
+      throw new Error('Submission failed');
+    }
+
+    return await response.json();
+  } catch (error) {
+    console.error('Form submission error:', error);
+    throw error;
+  }
+}
+```
+
+**For JSON submissions:**
+```javascript
+async function submitJSON(data) {
+  // Get CSRF token
+  const tokenResponse = await fetch('/api/csrf-token');
+  const { csrfToken } = await tokenResponse.json();
+
+  // Submit with CSRF token
+  const response = await fetch('/api/cases/submit', {
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/json',
+      'CSRF-Token': csrfToken  // Can also use header instead of body
+    },
+    body: JSON.stringify({
+      ...data,
+      _csrf: csrfToken  // Or include in body
+    })
+  });
+
+  return response.json();
+}
+```
+
+---
+
+## Step 4: Test the Security Measures
+
+### Test Security Headers
+```bash
+# Check headers are present
+curl -I http://localhost:9000
+
+# Expected headers:
+# Content-Security-Policy: ...
+# X-Content-Type-Options: nosniff
+# X-Frame-Options: DENY
+# X-XSS-Protection: 1; mode=block
+# Referrer-Policy: strict-origin-when-cross-origin
+# Permissions-Policy: geolocation=(), ...
+```
+
+### Test Rate Limiting
+```bash
+# Exceed public limit (should get 429 after 100 requests)
+for i in {1..110}; do
+  curl -s -o /dev/null -w "%{http_code}\n" http://localhost:9000
+done
+
+# Expected: First 100 return 200, remaining return 429
+```
+
+### Test Input Validation
+```bash
+# Test XSS payload (should be sanitized)
+curl -X POST http://localhost:9000/api/contact \
+  -H "Content-Type: application/json" \
+  -d '{"name":"<script>alert(1)</script>","email":"test@example.com","message":"test"}'
+
+# Expected: Name sanitized to empty or plain text
+```
+
+### Test CSRF Protection
+```bash
+# Request without CSRF token (should be rejected)
+curl -X POST http://localhost:9000/api/contact \
+  -H "Content-Type: application/json" \
+  -d '{"name":"Test","email":"test@example.com","message":"test"}'
+
+# Expected: 403 Forbidden with "Invalid CSRF token"
+```
+
+### Check Security Logs
+```bash
+# View security events
+tail -f /var/log/tractatus/security-audit.log
+
+# Should see JSON entries for:
+# - rate_limit_exceeded
+# - input_sanitized
+# - input_validation_failure
+```
+
+---
+
+## Step 5: Deploy to Production
+
+### 1. Commit Changes
+```bash
+git add src/middleware/ src/utils/security-logger.js src/server.js
+git commit -m "security: implement quick wins (headers, rate limiting, CSRF, input validation)"
+```
+
+### 2. Deploy to Production
+```bash
+# Your deployment script
+./scripts/deploy-full-project-SAFE.sh
+
+# Or manual deployment
+rsync -avz --chmod=D755,F644 -e "ssh -i ~/.ssh/tractatus_deploy" \
+  src/middleware/ src/utils/security-logger.js \
+  ubuntu@vps-93a693da.vps.ovh.net:/var/www/tractatus/src/
+
+# Restart production server
+ssh -i ~/.ssh/tractatus_deploy ubuntu@vps-93a693da.vps.ovh.net \
+  "sudo systemctl restart tractatus"
+```
+
+### 3. Verify Production
+```bash
+# Check headers on production
+curl -I https://agenticgovernance.digital
+
+# Test rate limiting
+for i in {1..110}; do
+  curl -s -o /dev/null -w "%{http_code}\n" https://agenticgovernance.digital
+done
+
+# Check SecurityHeaders.com grade
+# Visit: https://securityheaders.com/?q=https://agenticgovernance.digital
+# Expected: Grade A or A+
+```
+
+### 4. Monitor for Issues
+```bash
+# Watch production logs
+ssh -i ~/.ssh/tractatus_deploy ubuntu@vps-93a693da.vps.ovh.net \
+  "tail -f /var/www/tractatus/logs/combined.log"
+
+# Watch security logs
+ssh -i ~/.ssh/tractatus_deploy ubuntu@vps-93a693da.vps.ovh.net \
+  "tail -f /var/log/tractatus/security-audit.log"
+```
+
+---
+
+## What's Next? (Phase 1-6)
+
+These quick wins give you immediate protection. When ready for comprehensive security:
+
+1. **Phase 1** - Install ClamAV, YARA, fail2ban, Redis
+2. **Phase 2** - File upload malware scanning, email security
+3. **Phase 3** - Enhanced input validation (NoSQL injection, XSS detection)
+4. **Phase 4** - JWT authentication, Redis rate limiting, IP blocking
+5. **Phase 5** - Security dashboard, ProtonMail alerts, Signal notifications
+6. **Phase 6** - Penetration testing, team training, external audit
+
+See `docs/plans/security-implementation-roadmap.md` for full details.
+
+---
+
+## Troubleshooting
+
+### "Cannot find module 'express-rate-limit'"
+```bash
+npm install express-rate-limit validator csurf cookie-parser
+```
+
+### "Permission denied: /var/log/tractatus/"
+```bash
+sudo mkdir -p /var/log/tractatus
+sudo chown -R $USER:$USER /var/log/tractatus
+sudo chmod 750 /var/log/tractatus
+```
+
+### CSRF token errors on GET requests
+CSRF protection is only applied to POST/PUT/DELETE/PATCH. GET requests should not be affected.
+
+### Rate limit too restrictive
+Adjust limits in `src/middleware/rate-limit.middleware.js`:
+```javascript
+const publicRateLimiter = createRateLimiter({
+  windowMs: 15 * 60 * 1000,
+  max: 200,  // Increase from 100 to 200
+  tier: 'public'
+});
+```
+
+### Security headers causing issues
+Temporarily disable specific headers in `src/middleware/security-headers.middleware.js` while debugging.
+
+---
+
+## Performance Impact
+
+Expected performance impact: **<10ms per request**
+
+- Security headers: <1ms (set headers only)
+- Input validation: 2-5ms (depends on input size)
+- Rate limiting: 1-2ms (in-memory lookup)
+- CSRF validation: 1-2ms (token comparison)
+- Response sanitization: 1-2ms (field removal)
+
+**Total:** ~5-10ms additional latency per request (negligible for most applications)
+
+---
+
+## Success Criteria
+
+✅ Security headers present on all responses
+✅ SecurityHeaders.com grade A or A+
+✅ Rate limiting preventing abuse (429 errors after limits)
+✅ CSRF tokens required for POST/PUT/DELETE
+✅ Input sanitization removing HTML tags
+✅ Security events logged to `/var/log/tractatus/security-audit.log`
+✅ Error responses sanitized (no stack traces in production)
+✅ Zero false positives with legitimate traffic
+
+---
+
+## Support
+
+**Questions?** Check:
+- `docs/plans/security-implementation-roadmap.md` - Full implementation plan
+- `docs/plans/security-implementation-tracker.md` - Phase tracking
+- `.claude/instruction-history.json` - inst_041 through inst_046
+
+**Issues?** Create incident report in `docs/security/incidents/`
+
+**Ready for More?** Proceed to Phase 1 in the tracker!
+
+---
+
+**Last Updated:** 2025-10-14
+**Version:** 1.0 (Quick Wins)
+**Next:** Full Phase 1-6 implementation
diff --git a/docs/plans/security-implementation-tracker.md b/docs/plans/security-implementation-tracker.md
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+# Security Implementation Tracker
+**Tractatus 6-Phase Security Framework**
+
+**Project Start:** 2025-10-14
+**Target Completion:** TBD
+**Current Phase:** Phase 0 (Quick Wins)
+**Overall Status:** 🟡 In Progress
+
+---
+
+## Quick Reference
+
+| Phase | Status | Progress | Start Date | Completion Date | Effort (hours) |
+|-------|--------|----------|------------|-----------------|----------------|
+| **Phase 0: Quick Wins** | 🟡 In Progress | 0% | 2025-10-14 | - | 0 / 5 |
+| **Phase 1: Foundation** | ⚪ Not Started | 0% | - | - | 0 / 25 |
+| **Phase 2: File & Email** | ⚪ Not Started | 0% | - | - | 0 / 45 |
+| **Phase 3: App Security** | ⚪ Not Started | 0% | - | - | 0 / 35 |
+| **Phase 4: API Protection** | ⚪ Not Started | 0% | - | - | 0 / 35 |
+| **Phase 5: Monitoring** | ⚪ Not Started | 0% | - | - | 0 / 45 |
+| **Phase 6: Integration** | ⚪ Not Started | 0% | - | - | 0 / 30 |
+| **TOTAL** | - | 0% | - | - | 0 / 220 |
+
+**Legend:** 🟢 Complete | 🟡 In Progress | 🔴 Blocked | ⚪ Not Started
+
+---
+
+## Phase 0: Quick Wins (80/20 Approach)
+
+**Goal:** Implement high-value, low-effort security measures immediately
+**Duration:** 1 day
+**Effort:** 5 hours
+**Status:** 🟡 In Progress
+
+### Quick Win Tasks
+
+#### QW-1: Security Headers Middleware ✅ HIGH VALUE, LOW EFFORT
+- [ ] Create `src/middleware/security-headers.middleware.js`
+- [ ] Implement CSP, HSTS, X-Frame-Options, X-Content-Type-Options
+- [ ] Apply globally to all routes in `src/server.js`
+- [ ] Test headers with `curl -I localhost:9000`
+- [ ] Verify on SecurityHeaders.com
+- **Effort:** 30 minutes
+- **Value:** Prevents XSS, clickjacking, MIME sniffing attacks
+
+#### QW-2: Basic Input Validation ✅ HIGH VALUE, MEDIUM EFFORT
+- [ ] Install dependencies: `npm install validator dompurify jsdom`
+- [ ] Create `src/middleware/input-validation.middleware.js` (basic version)
+- [ ] Implement HTML sanitization and length limits
+- [ ] Apply to critical endpoints (cases, media, contact)
+- [ ] Test with XSS payloads
+- **Effort:** 1 hour
+- **Value:** Prevents XSS and injection attacks on forms
+
+#### QW-3: Rate Limiting (In-Memory) ✅ HIGH VALUE, LOW EFFORT
+- [ ] Install: `npm install express-rate-limit`
+- [ ] Create `src/middleware/rate-limit.middleware.js` (basic version)
+- [ ] Apply to public endpoints (100 req/15min)
+- [ ] Apply to form endpoints (5 req/min)
+- [ ] Test by exceeding limits
+- **Effort:** 30 minutes
+- **Value:** Prevents brute force, DoS, spam
+
+#### QW-4: File Upload Size Limits ✅ MEDIUM VALUE, LOW EFFORT
+- [ ] Configure multer file size limits in existing upload routes
+- [ ] Set 10MB for documents, 50MB for media
+- [ ] Add basic MIME type validation
+- [ ] Test with oversized files
+- **Effort:** 20 minutes
+- **Value:** Prevents resource exhaustion
+
+#### QW-5: CSRF Protection ✅ HIGH VALUE, LOW EFFORT
+- [ ] Install: `npm install csurf cookie-parser`
+- [ ] Configure CSRF middleware in `src/server.js`
+- [ ] Add CSRF token endpoint `/api/csrf-token`
+- [ ] Update client-side forms to include CSRF token
+- [ ] Test CSRF rejection
+- **Effort:** 45 minutes
+- **Value:** Prevents cross-site request forgery
+
+#### QW-6: Basic Security Logging ✅ MEDIUM VALUE, LOW EFFORT
+- [ ] Create `/var/log/tractatus/security-audit.log`
+- [ ] Create `src/utils/security-logger.js` (simple version)
+- [ ] Log failed auth attempts, rate limits, validation failures
+- [ ] Test logging with security events
+- **Effort:** 30 minutes
+- **Value:** Audit trail for security events
+
+#### QW-7: Response Sanitization ✅ MEDIUM VALUE, LOW EFFORT
+- [ ] Create `src/middleware/response-sanitization.middleware.js`
+- [ ] Hide stack traces in production
+- [ ] Remove sensitive fields from responses
+- [ ] Apply error handler globally
+- [ ] Test with forced errors
+- **Effort:** 30 minutes
+- **Value:** Prevents information disclosure
+
+#### QW-8: Deploy to Production ✅ CRITICAL
+- [ ] Commit all changes
+- [ ] Deploy security middleware to production
+- [ ] Verify headers on production
+- [ ] Monitor for false positives
+- [ ] Create rollback plan
+- **Effort:** 30 minutes
+- **Value:** Security improvements live
+
+### Quick Wins Completion Criteria
+- [ ] All 8 quick win tasks completed
+- [ ] Security headers active on production
+- [ ] Basic input validation working
+- [ ] Rate limiting preventing abuse
+- [ ] CSRF protection enabled
+- [ ] Security logging operational
+- [ ] Zero critical issues from quick wins
+- [ ] Performance impact <10ms per request
+
+**Progress:** 0 / 8 tasks complete (0%)
+
+---
+
+## Phase 1: Foundation & Sovereign Tools
+
+**Goal:** Install and configure all security infrastructure
+**Duration:** 1-2 weeks
+**Effort:** 25 hours
+**Status:** ⚪ Not Started
+**Dependencies:** Phase 0 complete
+
+### Infrastructure Installation
+
+#### P1-1: ClamAV Antivirus Setup
+- [ ] Install ClamAV and daemon: `apt install clamav clamav-daemon`
+- [ ] Configure `/etc/clamav/clamd.conf` (max file sizes)
+- [ ] Configure `/etc/clamav/freshclam.conf` (daily updates)
+- [ ] Update virus definitions: `freshclam`
+- [ ] Enable and start services
+- [ ] Test with EICAR file
+- **Effort:** 2 hours
+- **Blockers:** None
+- **Priority:** HIGH
+
+#### P1-2: YARA Pattern Matching
+- [ ] Install YARA: `apt install yara`
+- [ ] Create `/etc/yara/rules/` directory
+- [ ] Create base rule set (suspicious executables, scripts, macros)
+- [ ] Test rules on sample files
+- [ ] Document rule update process
+- **Effort:** 1.5 hours
+- **Blockers:** None
+- **Priority:** HIGH
+
+#### P1-3: fail2ban Installation
+- [ ] Install fail2ban: `apt install fail2ban`
+- [ ] Copy jail.conf to jail.local
+- [ ] Basic configuration (will integrate in Phase 5)
+- [ ] Enable and start service
+- [ ] Verify status
+- **Effort:** 1 hour
+- **Blockers:** None
+- **Priority:** MEDIUM
+
+#### P1-4: Redis for Rate Limiting
+- [ ] Install Redis: `apt install redis-server`
+- [ ] Configure `/etc/redis/redis.conf` (bind localhost, password)
+- [ ] Set maxmemory 256mb
+- [ ] Enable and start service
+- [ ] Test connection with redis-cli
+- **Effort:** 1 hour
+- **Blockers:** None
+- **Priority:** MEDIUM (can use in-memory initially)
+
+#### P1-5: Email Stack Installation
+- [ ] Install postfix: `apt install postfix`
+- [ ] Install SpamAssassin: `apt install spamassassin`
+- [ ] Install amavisd-new: `apt install amavisd-new`
+- [ ] Install OpenDKIM: `apt install opendkim`
+- [ ] Basic configuration (detailed in Phase 2)
+- [ ] Verify services running
+- **Effort:** 3 hours
+- **Blockers:** None
+- **Priority:** LOW (can defer if no email submissions yet)
+
+### Logging Infrastructure
+
+#### P1-6: Log Directory Setup
+- [ ] Create `/var/log/tractatus/` with correct permissions
+- [ ] Create `/var/quarantine/tractatus/` for suspicious files
+- [ ] Create `/var/quarantine/email/` for suspicious emails
+- [ ] Configure log rotation in `/etc/logrotate.d/tractatus`
+- [ ] Test log rotation
+- **Effort:** 30 minutes
+- **Blockers:** None
+- **Priority:** HIGH
+
+### Communication Setup
+
+#### P1-7: ProtonMail Configuration
+- [ ] Create ProtonMail Business accounts
+- [ ] Configure `security@tractatus.digital`
+- [ ] Configure `admin@tractatus.digital`
+- [ ] Set up custom domain integration
+- [ ] Test email delivery to all team members
+- [ ] Document credentials securely
+- **Effort:** 2 hours
+- **Blockers:** None
+- **Priority:** MEDIUM
+
+#### P1-8: Signal Setup
+- [ ] Create "Tractatus Security Team" Signal group
+- [ ] Add all team members with verified numbers
+- [ ] Document escalation protocol (4 levels)
+- [ ] Test notification chain with dummy alert
+- [ ] Save group ID for automation
+- **Effort:** 1 hour
+- **Blockers:** Team member availability
+- **Priority:** MEDIUM
+
+### Documentation
+
+#### P1-9: Security Documentation Structure
+- [ ] Create `docs/security/` directory structure
+- [ ] Create `SECURITY_POLICY.md` (template)
+- [ ] Create `INCIDENT_RESPONSE.md` (template)
+- [ ] Create `ALERT_THRESHOLDS.md`
+- [ ] Create `TOOL_INVENTORY.md`
+- [ ] Document all installed tools and versions
+- **Effort:** 2 hours
+- **Blockers:** None
+- **Priority:** MEDIUM
+
+### Phase 1 Completion Criteria
+- [ ] All sovereign tools installed and operational
+- [ ] ClamAV scanning functional (tested with EICAR)
+- [ ] YARA rules loading without errors
+- [ ] fail2ban service running
+- [ ] Redis operational (or documented as deferred)
+- [ ] Email stack installed (or documented as deferred)
+- [ ] Log directories created with correct permissions
+- [ ] ProtonMail accounts configured
+- [ ] Signal group created with all team members
+- [ ] Security documentation structure in place
+- [ ] Tool inventory documented
+
+**Progress:** 0 / 9 tasks complete (0%)
+
+---
+
+## Phase 2: File & Email Security
+
+**Goal:** Implement file upload validation and email security pipeline
+**Duration:** 2-3 weeks
+**Effort:** 45 hours
+**Status:** ⚪ Not Started
+**Dependencies:** Phase 1 complete
+
+### File Upload Validation (inst_041)
+
+#### P2-1: Enhanced Security Logger
+- [ ] Upgrade `src/utils/security-logger.js` with full JSON logging
+- [ ] Add severity levels
+- [ ] Add event type taxonomy
+- [ ] Test logging to `/var/log/tractatus/security-audit.log`
+- [ ] Verify log format with JSON parser
+- **Effort:** 1 hour
+- **Blockers:** Phase 1 logging setup
+- **Priority:** HIGH
+
+#### P2-2: File Security Middleware
+- [ ] Create `src/middleware/file-security.middleware.js`
+- [ ] Implement file(1) type validation
+- [ ] Integrate ClamAV scanning (clamdscan)
+- [ ] Integrate YARA pattern matching
+- [ ] Implement quarantine system
+- [ ] Add comprehensive logging
+- [ ] Create size limit enforcement
+- **Effort:** 6 hours
+- **Blockers:** Phase 1 ClamAV/YARA installed
+- **Priority:** HIGH
+
+#### P2-3: File Upload Route Integration
+- [ ] Apply file security to `/api/cases/submit`
+- [ ] Apply to `/api/media/upload`
+- [ ] Apply to any other upload endpoints
+- [ ] Update multer configuration
+- [ ] Test with clean files
+- [ ] Test with malware samples (EICAR)
+- **Effort:** 2 hours
+- **Blockers:** P2-2 complete
+- **Priority:** HIGH
+
+#### P2-4: Quarantine Management
+- [ ] Create quarantine review script
+- [ ] Add manual release procedure
+- [ ] Add permanent delete procedure
+- [ ] Document quarantine workflow
+- [ ] Test quarantine/release/delete
+- **Effort:** 2 hours
+- **Blockers:** P2-2 complete
+- **Priority:** MEDIUM
+
+### Email Security (inst_042)
+
+#### P2-5: Postfix Configuration
+- [ ] Configure `/etc/postfix/main.cf`
+- [ ] Set up virtual domains
+- [ ] Configure relay restrictions
+- [ ] Enable TLS
+- [ ] Test mail delivery
+- **Effort:** 3 hours
+- **Blockers:** Phase 1 email stack installed
+- **Priority:** MEDIUM (if email submissions active)
+
+#### P2-6: SpamAssassin Configuration
+- [ ] Configure `/etc/spamassassin/local.cf`
+- [ ] Set required score: 5.0
+- [ ] Add custom rules for governance domain
+- [ ] Enable auto-learn
+- [ ] Test spam filtering
+- **Effort:** 2 hours
+- **Blockers:** P2-5 complete
+- **Priority:** MEDIUM
+
+#### P2-7: amavisd-new Integration
+- [ ] Configure `/etc/amavis/conf.d/`
+- [ ] Integrate ClamAV backend
+- [ ] Set virus scanning policies
+- [ ] Configure quarantine actions
+- [ ] Test virus detection in email
+- **Effort:** 3 hours
+- **Blockers:** P2-5, P2-6 complete
+- **Priority:** MEDIUM
+
+#### P2-8: DKIM/SPF/DMARC Setup
+- [ ] Generate DKIM keys
+- [ ] Add DNS TXT records (DKIM, SPF, DMARC)
+- [ ] Configure OpenDKIM
+- [ ] Test email authentication
+- [ ] Verify with mail-tester.com
+- **Effort:** 4 hours
+- **Blockers:** P2-5 complete
+- **Priority:** MEDIUM
+
+#### P2-9: Email Attachment Validation
+- [ ] Configure allowed attachment types
+- [ ] Block executables, scripts, archives
+- [ ] Implement attachment scanning
+- [ ] Set up email quarantine
+- [ ] Test with various attachment types
+- **Effort:** 2 hours
+- **Blockers:** P2-7 complete
+- **Priority:** MEDIUM
+
+### Testing & Documentation
+
+#### P2-10: File Security Testing
+- [ ] Test with clean PDF, DOC, images
+- [ ] Test with EICAR malware
+- [ ] Test with MIME type mismatch
+- [ ] Test with oversized files
+- [ ] Test with ZIP bombs
+- [ ] Document test results
+- **Effort:** 2 hours
+- **Blockers:** P2-3 complete
+- **Priority:** HIGH
+
+#### P2-11: Email Security Testing
+- [ ] Send clean email with attachment
+- [ ] Send spam-like email
+- [ ] Send email with malware attachment
+- [ ] Test DKIM/SPF/DMARC validation
+- [ ] Verify quarantine functionality
+- [ ] Document test results
+- **Effort:** 2 hours
+- **Blockers:** P2-9 complete
+- **Priority:** MEDIUM
+
+### Phase 2 Completion Criteria
+- [ ] File upload validation operational on all endpoints
+- [ ] ClamAV detecting malware (100% EICAR detection)
+- [ ] YARA detecting suspicious patterns
+- [ ] File quarantine system working
+- [ ] Clean files passing validation
+- [ ] Email stack configured (if applicable)
+- [ ] Spam filtering operational
+- [ ] Email virus scanning functional
+- [ ] DKIM/SPF/DMARC passing
+- [ ] Email quarantine working
+- [ ] Zero false positives with legitimate files
+- [ ] All tests documented
+
+**Progress:** 0 / 11 tasks complete (0%)
+
+---
+
+## Phase 3: Application Security
+
+**Goal:** Input validation, HTTP headers, CSRF protection, CSP reporting
+**Duration:** 1-2 weeks
+**Effort:** 35 hours
+**Status:** ⚪ Not Started
+**Dependencies:** Phase 0 (quick wins provide foundation)
+
+### Enhanced Input Validation
+
+#### P3-1: Full Input Validation Middleware
+- [ ] Enhance existing input validation from Phase 0
+- [ ] Add data type validation (email, URL, phone, numeric)
+- [ ] Add NoSQL injection detection
+- [ ] Add XSS pattern detection
+- [ ] Implement validation schemas per endpoint
+- [ ] Test with injection payloads
+- **Effort:** 4 hours
+- **Blockers:** Phase 0 basic validation in place
+- **Priority:** HIGH
+
+#### P3-2: Apply Validation to All Endpoints
+- [ ] `/api/cases/submit` validation schema
+- [ ] `/api/media/inquiry` validation schema
+- [ ] `/api/contact` validation schema
+- [ ] Any other form endpoints
+- [ ] Test each endpoint with valid/invalid data
+- **Effort:** 3 hours
+- **Blockers:** P3-1 complete
+- **Priority:** HIGH
+
+### Enhanced Security Headers
+
+#### P3-3: Upgrade Security Headers
+- [ ] Enhance existing headers from Phase 0
+- [ ] Add Permissions-Policy
+- [ ] Fine-tune CSP directives
+- [ ] Add CSP report-uri
+- [ ] Test on SecurityHeaders.com (target: A+)
+- **Effort:** 2 hours
+- **Blockers:** Phase 0 basic headers in place
+- **Priority:** MEDIUM
+
+#### P3-4: CSP Violation Reporting Endpoint
+- [ ] Create `/api/csp-violations` endpoint
+- [ ] Parse CSP reports
+- [ ] Log to security audit trail
+- [ ] Test with intentional CSP violation
+- [ ] Monitor for patterns
+- **Effort:** 2 hours
+- **Blockers:** P3-3 complete
+- **Priority:** MEDIUM
+
+### CSRF Protection
+
+#### P3-5: CSRF Token Management
+- [ ] Enhance CSRF from Phase 0 if needed
+- [ ] Ensure all POST/PUT/DELETE protected
+- [ ] Test token rotation per session
+- [ ] Test CSRF rejection
+- [ ] Document client-side integration
+- **Effort:** 1 hour
+- **Blockers:** Phase 0 CSRF in place
+- **Priority:** HIGH
+
+### Testing & Documentation
+
+#### P3-6: Input Validation Testing
+- [ ] Test XSS payloads (script tags, event handlers)
+- [ ] Test NoSQL injection (`$ne`, `$gt`, etc.)
+- [ ] Test SQL injection patterns
+- [ ] Test length limit enforcement
+- [ ] Test data type validation
+- [ ] Document all test cases
+- **Effort:** 3 hours
+- **Blockers:** P3-2 complete
+- **Priority:** HIGH
+
+#### P3-7: Security Headers Testing
+- [ ] Verify all headers present
+- [ ] Test CSP blocking inline scripts
+- [ ] Test X-Frame-Options blocking iframes
+- [ ] Test HSTS enforcement
+- [ ] Run SecurityHeaders.com scan
+- [ ] Document header configuration
+- **Effort:** 2 hours
+- **Blockers:** P3-3 complete
+- **Priority:** MEDIUM
+
+### Phase 3 Completion Criteria
+- [ ] Input validation on all form endpoints
+- [ ] HTML sanitization removing XSS patterns
+- [ ] NoSQL injection detection functional
+- [ ] Security headers returning A or A+ grade
+- [ ] CSP violation reporting operational
+- [ ] CSRF protection on all state-changing operations
+- [ ] Zero false positives with legitimate input
+- [ ] All tests passing
+- [ ] Documentation complete
+
+**Progress:** 0 / 7 tasks complete (0%)
+
+---
+
+## Phase 4: API Protection
+
+**Goal:** Rate limiting, JWT authentication, IP blocking, request validation
+**Duration:** 1-2 weeks
+**Effort:** 35 hours
+**Status:** ⚪ Not Started
+**Dependencies:** Phase 1 (Redis), Phase 0 (basic rate limiting)
+
+### JWT Authentication System
+
+#### P4-1: JWT Middleware Implementation
+- [ ] Create `src/middleware/auth.middleware.js`
+- [ ] Implement access token generation (15min expiry)
+- [ ] Implement refresh token generation (7day expiry)
+- [ ] Implement token verification
+- [ ] Add role-based authorization
+- [ ] Test token lifecycle
+- **Effort:** 4 hours
+- **Blockers:** None
+- **Priority:** HIGH
+
+#### P4-2: Authentication Routes
+- [ ] Create `/api/auth/login` endpoint
+- [ ] Create `/api/auth/refresh` endpoint
+- [ ] Create `/api/auth/logout` endpoint
+- [ ] Hash passwords with bcrypt
+- [ ] Test authentication flow
+- **Effort:** 3 hours
+- **Blockers:** P4-1 complete
+- **Priority:** HIGH
+
+#### P4-3: Apply Authentication to Routes
+- [ ] Protect `/api/cases/*` (authenticated)
+- [ ] Protect `/api/media/*` (authenticated)
+- [ ] Protect `/api/admin/*` (admin role)
+- [ ] Protect `/api/governance/*` (admin role)
+- [ ] Test unauthorized access rejection
+- **Effort:** 2 hours
+- **Blockers:** P4-2 complete
+- **Priority:** HIGH
+
+### Enhanced Rate Limiting
+
+#### P4-4: Redis-Based Rate Limiting
+- [ ] Upgrade rate limiting from Phase 0 to use Redis
+- [ ] Create `src/middleware/rate-limit.middleware.js` (full version)
+- [ ] Implement public tier (100 req/15min)
+- [ ] Implement authenticated tier (1000 req/15min)
+- [ ] Implement admin tier (50 req/15min)
+- [ ] Test each tier
+- **Effort:** 3 hours
+- **Blockers:** Phase 1 Redis installed
+- **Priority:** HIGH
+
+#### P4-5: IP Blocking System
+- [ ] Implement violation tracking in Redis
+- [ ] Add automatic blocking (10 violations = 24hr block)
+- [ ] Create IP whitelist mechanism
+- [ ] Test blocking and expiry
+- [ ] Document manual unblock procedure
+- **Effort:** 3 hours
+- **Blockers:** P4-4 complete
+- **Priority:** MEDIUM
+
+### API Request Validation
+
+#### P4-6: API Validation Middleware
+- [ ] Create `src/middleware/api-validation.middleware.js`
+- [ ] Implement content-type validation
+- [ ] Implement payload size validation (1MB max)
+- [ ] Implement unexpected field rejection
+- [ ] Test with malformed requests
+- **Effort:** 2 hours
+- **Blockers:** None
+- **Priority:** MEDIUM
+
+### Response Sanitization
+
+#### P4-7: Enhanced Response Sanitization
+- [ ] Upgrade from Phase 0 quick win
+- [ ] Hide stack traces in production
+- [ ] Remove internal paths from errors
+- [ ] Sanitize database errors
+- [ ] Test with forced errors
+- **Effort:** 2 hours
+- **Blockers:** Phase 0 basic sanitization
+- **Priority:** MEDIUM
+
+### Testing & Documentation
+
+#### P4-8: Authentication Testing
+- [ ] Test login with valid credentials
+- [ ] Test login with invalid credentials
+- [ ] Test token expiry (15min access)
+- [ ] Test refresh token flow
+- [ ] Test role-based authorization
+- [ ] Document JWT configuration
+- **Effort:** 2 hours
+- **Blockers:** P4-3 complete
+- **Priority:** HIGH
+
+#### P4-9: Rate Limiting Testing
+- [ ] Exceed public limit (test 101 requests)
+- [ ] Exceed authenticated limit (test 1001 requests)
+- [ ] Trigger IP block (10 violations)
+- [ ] Verify Redis storing data
+- [ ] Test distributed rate limiting
+- [ ] Document rate limit configuration
+- **Effort:** 2 hours
+- **Blockers:** P4-5 complete
+- **Priority:** HIGH
+
+### Phase 4 Completion Criteria
+- [ ] JWT authentication operational
+- [ ] Access tokens expiring after 15 minutes
+- [ ] Refresh tokens working (7 days)
+- [ ] Role-based authorization enforced
+- [ ] Redis-based rate limiting active
+- [ ] IP blocking functional (10 violations = block)
+- [ ] Content-type validation enforced
+- [ ] Payload size limits working
+- [ ] Response sanitization hiding sensitive data
+- [ ] All tests passing
+- [ ] Documentation complete
+
+**Progress:** 0 / 9 tasks complete (0%)
+
+---
+
+## Phase 5: Security Monitoring & Alerting
+
+**Goal:** Dashboard, fail2ban, alerts, weekly reports
+**Duration:** 2-3 weeks
+**Effort:** 45 hours
+**Status:** ⚪ Not Started
+**Dependencies:** Phases 1-4 complete
+
+### Security Monitoring Dashboard
+
+#### P5-1: Dashboard Frontend
+- [ ] Create `public/admin/security-monitoring.html`
+- [ ] Build metrics grid (8 key metrics)
+- [ ] Build recent events table
+- [ ] Build top violating IPs display
+- [ ] Add time range selector
+- [ ] Style with Tailwind
+- **Effort:** 6 hours
+- **Blockers:** None
+- **Priority:** HIGH
+
+#### P5-2: Dashboard Backend API
+- [ ] Create `src/controllers/security-monitoring.controller.js`
+- [ ] Implement log parsing function
+- [ ] Implement metrics calculation
+- [ ] Create `/api/security-monitoring/metrics` endpoint
+- [ ] Create `/api/security-monitoring/events` endpoint
+- [ ] Test with sample log data
+- **Effort:** 4 hours
+- **Blockers:** None
+- **Priority:** HIGH
+
+#### P5-3: Dashboard Client-Side Logic
+- [ ] Create `public/js/admin/security-monitoring.js`
+- [ ] Fetch and display metrics
+- [ ] Fetch and render events table
+- [ ] Implement auto-refresh (every 30s)
+- [ ] Add loading states
+- [ ] Test dashboard interaction
+- **Effort:** 3 hours
+- **Blockers:** P5-1, P5-2 complete
+- **Priority:** HIGH
+
+### fail2ban Integration
+
+#### P5-4: fail2ban Filter Configuration
+- [ ] Create `/etc/fail2ban/filter.d/tractatus.conf`
+- [ ] Add patterns for rate limit violations
+- [ ] Add patterns for authentication failures
+- [ ] Add patterns for injection attempts
+- [ ] Test filter with fail2ban-regex
+- **Effort:** 2 hours
+- **Blockers:** Phase 1 fail2ban installed
+- **Priority:** MEDIUM
+
+#### P5-5: fail2ban Jail Configuration
+- [ ] Configure jail in `/etc/fail2ban/jail.local`
+- [ ] Set maxretry: 10, findtime: 3600, bantime: 86400
+- [ ] Enable tractatus jail
+- [ ] Restart fail2ban
+- [ ] Test banning with violations
+- **Effort:** 1 hour
+- **Blockers:** P5-4 complete
+- **Priority:** MEDIUM
+
+### Alert System
+
+#### P5-6: ProtonMail Alert Integration
+- [ ] Install ProtonMail Bridge on server
+- [ ] Create `src/utils/email-alerts.js`
+- [ ] Configure nodemailer with ProtonMail Bridge
+- [ ] Create email alert templates
+- [ ] Test email sending
+- **Effort:** 3 hours
+- **Blockers:** Phase 1 ProtonMail accounts
+- **Priority:** MEDIUM
+
+#### P5-7: Signal Notification Integration
+- [ ] Install signal-cli on server
+- [ ] Register Signal number
+- [ ] Create `src/utils/signal-alerts.js`
+- [ ] Implement text notification function
+- [ ] Test Signal sending to group
+- **Effort:** 2 hours
+- **Blockers:** Phase 1 Signal group created
+- **Priority:** MEDIUM
+
+#### P5-8: Alert Monitoring Service
+- [ ] Create `src/services/alert-monitor.service.js`
+- [ ] Implement threshold checking (10 violations, 100 global)
+- [ ] Integrate email alerts
+- [ ] Integrate Signal notifications
+- [ ] Start monitoring on server startup
+- [ ] Test alert triggers
+- **Effort:** 4 hours
+- **Blockers:** P5-6, P5-7 complete
+- **Priority:** HIGH
+
+### Weekly Security Reports
+
+#### P5-9: Report Generator Script
+- [ ] Create `scripts/generate-security-report.js`
+- [ ] Implement metrics aggregation (7 days)
+- [ ] Implement trend analysis (week-over-week)
+- [ ] Identify attack patterns
+- [ ] Generate recommendations
+- [ ] Email report to security team
+- **Effort:** 4 hours
+- **Blockers:** P5-6 complete
+- **Priority:** MEDIUM
+
+#### P5-10: Schedule Weekly Reports
+- [ ] Add cron job for Monday 9am reports
+- [ ] Test manual report generation
+- [ ] Verify email delivery
+- [ ] Create report archive directory
+- [ ] Document report format
+- **Effort:** 1 hour
+- **Blockers:** P5-9 complete
+- **Priority:** MEDIUM
+
+### Testing & Documentation
+
+#### P5-11: Dashboard Testing
+- [ ] Verify metrics calculating correctly
+- [ ] Test with various time ranges
+- [ ] Test event table pagination
+- [ ] Test auto-refresh
+- [ ] Load test dashboard (1000+ events)
+- [ ] Document dashboard usage
+- **Effort:** 2 hours
+- **Blockers:** P5-3 complete
+- **Priority:** HIGH
+
+#### P5-12: Alert Testing
+- [ ] Trigger single IP alert (10 violations)
+- [ ] Trigger global alert (100 violations)
+- [ ] Trigger malware alert
+- [ ] Verify email delivery
+- [ ] Verify Signal notification
+- [ ] Test alert escalation
+- **Effort:** 2 hours
+- **Blockers:** P5-8 complete
+- **Priority:** HIGH
+
+### Phase 5 Completion Criteria
+- [ ] Security dashboard accessible and functional
+- [ ] Metrics displaying correctly
+- [ ] Recent events table showing log data
+- [ ] fail2ban banning IPs automatically
+- [ ] ProtonMail alerts sending successfully
+- [ ] Signal notifications delivering
+- [ ] Alert thresholds triggering correctly
+- [ ] Weekly reports generating and emailing
+- [ ] No false positive alerts
+- [ ] All tests passing
+- [ ] Documentation complete
+
+**Progress:** 0 / 12 tasks complete (0%)
+
+---
+
+## Phase 6: Integration & Hardening
+
+**Goal:** Testing, penetration testing, documentation, training
+**Duration:** 1-2 weeks
+**Effort:** 30 hours
+**Status:** ⚪ Not Started
+**Dependencies:** Phases 1-5 complete
+
+### Integration Testing
+
+#### P6-1: End-to-End Security Tests
+- [ ] Create `tests/integration/security-integration.test.js`
+- [ ] Test file upload → malware → quarantine → alert flow
+- [ ] Test XSS attempt → sanitization → rate limit → block flow
+- [ ] Test auth failure → logging → alert flow
+- [ ] Test coordinated attack → multiple layers → escalation
+- [ ] All integration tests passing
+- **Effort:** 6 hours
+- **Blockers:** All previous phases complete
+- **Priority:** HIGH
+
+#### P6-2: Performance Testing
+- [ ] Measure baseline response times (without security)
+- [ ] Measure with all security middleware (<50ms impact)
+- [ ] Load test rate limiting
+- [ ] Stress test file validation
+- [ ] Profile Redis performance
+- [ ] Optimize bottlenecks
+- **Effort:** 4 hours
+- **Blockers:** P6-1 complete
+- **Priority:** MEDIUM
+
+### Penetration Testing
+
+#### P6-3: Automated Security Scanning
+- [ ] Run OWASP ZAP scan
+- [ ] Run Nikto web scanner
+- [ ] Run testssl.sh for TLS
+- [ ] Run nmap port scan
+- [ ] Document findings
+- [ ] Fix critical vulnerabilities
+- **Effort:** 3 hours
+- **Blockers:** None
+- **Priority:** HIGH
+
+#### P6-4: Manual Penetration Testing
+- [ ] SQL/NoSQL injection attempts
+- [ ] XSS payload testing
+- [ ] CSRF bypass attempts
+- [ ] Authentication bypass attempts
+- [ ] Authorization escalation tests
+- [ ] File upload exploits
+- [ ] Document all findings
+- [ ] Fix all issues found
+- **Effort:** 6 hours
+- **Blockers:** P6-3 complete
+- **Priority:** HIGH
+
+### Documentation
+
+#### P6-5: Complete Security Documentation
+- [ ] Finalize `SECURITY_POLICY.md`
+- [ ] Complete `INCIDENT_RESPONSE.md`
+- [ ] Document `ALERT_THRESHOLDS.md`
+- [ ] Update `TOOL_INVENTORY.md`
+- [ ] Create `SECURITY_TESTING.md`
+- [ ] Review all documentation for accuracy
+- **Effort:** 4 hours
+- **Blockers:** None
+- **Priority:** HIGH
+
+#### P6-6: Operational Runbooks
+- [ ] Create daily operations checklist
+- [ ] Create weekly operations checklist
+- [ ] Create monthly operations checklist
+- [ ] Create troubleshooting guide
+- [ ] Create disaster recovery procedures
+- [ ] Test all procedures
+- **Effort:** 3 hours
+- **Blockers:** P6-5 complete
+- **Priority:** MEDIUM
+
+### Team Training
+
+#### P6-7: Security Training Sessions
+- [ ] Schedule training sessions (7 hours per member)
+- [ ] Module 1: Security Framework Overview (1 hour)
+- [ ] Module 2: Incident Response Training (2 hours)
+- [ ] Module 3: Tool-Specific Training (3 hours)
+- [ ] Module 4: Security Monitoring (1 hour)
+- [ ] All team members trained
+- **Effort:** 2 hours prep + training time
+- **Blockers:** P6-5 complete
+- **Priority:** HIGH
+
+#### P6-8: Incident Response Drill
+- [ ] Create incident simulation scenario
+- [ ] Schedule drill with team
+- [ ] Execute incident response playbook
+- [ ] Time response actions
+- [ ] Identify improvement areas
+- [ ] Update playbook based on learnings
+- **Effort:** 3 hours
+- **Blockers:** P6-7 complete
+- **Priority:** MEDIUM
+
+### Final Validation
+
+#### P6-9: External Security Audit
+- [ ] Engage external security consultant (optional)
+- [ ] Provide audit scope and access
+- [ ] Review audit findings
+- [ ] Address critical/high findings
+- [ ] Document remediation
+- [ ] Obtain sign-off
+- **Effort:** Variable (external)
+- **Blockers:** P6-4 complete
+- **Priority:** MEDIUM (optional but recommended)
+
+#### P6-10: Production Deployment Approval
+- [ ] Complete deployment checklist
+- [ ] Review all test results
+- [ ] Confirm zero critical vulnerabilities
+- [ ] Obtain stakeholder approval
+- [ ] Schedule production deployment
+- [ ] Execute deployment
+- [ ] Monitor for issues
+- **Effort:** 2 hours
+- **Blockers:** All tasks complete
+- **Priority:** CRITICAL
+
+### Phase 6 Completion Criteria
+- [ ] All integration tests passing
+- [ ] Performance impact <50ms
+- [ ] Penetration testing complete (no critical findings)
+- [ ] All security documentation complete
+- [ ] Operational runbooks tested
+- [ ] Team training complete (100% attendance)
+- [ ] Incident response drill successful
+- [ ] External audit passed (if conducted)
+- [ ] Production deployment approved
+- [ ] Post-implementation review complete
+
+**Progress:** 0 / 10 tasks complete (0%)
+
+---
+
+## Maintenance Schedule
+
+### Daily Checks (5 minutes)
+- [ ] Review security dashboard
+- [ ] Check for critical alerts
+- [ ] Verify fail2ban status
+- [ ] Check ClamAV daemon running
+
+### Weekly Tasks (30 minutes)
+- [ ] Review weekly security report
+- [ ] Analyze attack patterns
+- [ ] Review quarantined files
+- [ ] Update YARA rules if needed
+
+### Monthly Tasks (2 hours)
+- [ ] Verify ClamAV definitions updating
+- [ ] Review and adjust alert thresholds
+- [ ] Update security tool versions
+- [ ] Review access control lists
+- [ ] Security metrics review meeting
+
+### Quarterly Tasks (1 day)
+- [ ] Comprehensive security audit
+- [ ] Penetration testing
+- [ ] Team training refresher
+- [ ] Review incident response playbook
+- [ ] Update security documentation
+
+---
+
+## Risk Register
+
+| Risk | Likelihood | Impact | Mitigation | Owner | Status |
+|------|------------|--------|------------|-------|--------|
+| ClamAV false positives | Medium | Medium | Whitelist mechanism, manual review | SysAdmin | ⚪ |
+| Redis failure impacts rate limiting | Low | High | Fallback to in-memory | Developer | ⚪ |
+| Performance degradation | Medium | Medium | Benchmarking, optimization | Developer | ⚪ |
+| Alert fatigue | Medium | High | Threshold tuning | Security Team | ⚪ |
+| Tool incompatibility | Low | Medium | Version control, testing | SysAdmin | ⚪ |
+| Zero-day exploits | Low | High | Defense in depth, monitoring | Security Team | ⚪ |
+
+---
+
+## Notes & Decisions
+
+### 2025-10-14: Initial Tracker Creation
+- Created 6-phase implementation tracker
+- Added Phase 0 for quick wins (80/20 approach)
+- Quick wins: Security headers, input validation, rate limiting, CSRF, logging, response sanitization
+- Target: Get basic security in place within 1 day
+
+### Decisions Log
+- [ ] Decision: Start with Phase 0 (quick wins) before full implementation
+- [ ] Decision: Use in-memory rate limiting initially, upgrade to Redis in Phase 4
+- [ ] Decision: Defer email stack if no email submissions yet
+- [ ] Decision: ProtonMail Business for secure communications
+- [ ] Decision: Signal for team notifications and video calls
+
+---
+
+## Contact & Escalation
+
+**Security Team:**
+- Project Owner: [Name]
+- Lead Developer: [Name]
+- System Administrator: [Name]
+- Security Reviewer: [Name]
+
+**Escalation Path:**
+1. Low: Email security@tractatus.digital
+2. Medium: Email + Signal text
+3. High: Signal text + phone call
+4. Critical: Signal video call (immediate)
+
+**External Resources:**
+- Security Consultant: [Contact]
+- Legal Counsel: [Contact]
+- Incident Response: [Contact]
+
+---
+
+**Last Updated:** 2025-10-14
+**Next Review:** After Phase 0 completion
+**Tracker Version:** 1.0
diff --git a/src/middleware/input-validation.middleware.js b/src/middleware/input-validation.middleware.js
new file mode 100644
index 00000000..834fd6b0
--- /dev/null
+++ b/src/middleware/input-validation.middleware.js
@@ -0,0 +1,179 @@
+/**
+ * Input Validation Middleware (inst_043 - Quick Win Version)
+ * Sanitizes and validates all user input
+ *
+ * QUICK WIN: Basic HTML sanitization and length limits
+ * Full version in Phase 3 will add NoSQL/XSS detection, type validation
+ */
+
+const validator = require('validator');
+const { logSecurityEvent, getClientIp } = require('../utils/security-logger');
+
+// Input length limits per field type (inst_043)
+const LENGTH_LIMITS = {
+  email: 254,
+  url: 2048,
+  phone: 20,
+  name: 100,
+  title: 200,
+  description: 5000,
+  case_study: 50000,
+  default: 5000
+};
+
+/**
+ * Basic HTML sanitization (removes HTML tags)
+ * Full version will use DOMPurify for more sophisticated sanitization
+ */
+function sanitizeHTML(input) {
+  if (typeof input !== 'string') return '';
+
+  // Remove HTML tags (basic approach)
+  return input
+    .replace(/<[^>]*>/g, '')  // Remove HTML tags
+    .replace(/javascript:/gi, '')  // Remove javascript: URLs
+    .replace(/on\w+\s*=/gi, '')  // Remove event handlers
+    .trim();
+}
+
+/**
+ * Validate email format
+ */
+function isValidEmail(email) {
+  return validator.isEmail(email);
+}
+
+/**
+ * Validate URL format
+ */
+function isValidURL(url) {
+  return validator.isURL(url, { require_protocol: true });
+}
+
+/**
+ * Create input validation middleware
+ */
+function createInputValidationMiddleware(schema) {
+  return async (req, res, next) => {
+    const clientIp = getClientIp(req);
+    const errors = [];
+    const sanitized = {};
+
+    try {
+      for (const [field, config] of Object.entries(schema)) {
+        const value = req.body[field];
+
+        // Required field check
+        if (config.required && !value) {
+          errors.push(`${field} is required`);
+          continue;
+        }
+
+        // Skip validation if optional and not provided
+        if (!value && !config.required) {
+          continue;
+        }
+
+        // Length validation
+        const maxLength = config.maxLength || LENGTH_LIMITS[config.type] || LENGTH_LIMITS.default;
+        if (value && value.length > maxLength) {
+          errors.push(`${field} exceeds maximum length of ${maxLength} characters`);
+          continue;
+        }
+
+        // Type-specific validation
+        if (config.type === 'email' && !isValidEmail(value)) {
+          errors.push(`${field} must be a valid email address`);
+          continue;
+        }
+
+        if (config.type === 'url' && !isValidURL(value)) {
+          errors.push(`${field} must be a valid URL`);
+          continue;
+        }
+
+        // HTML sanitization (always applied to text fields)
+        if (typeof value === 'string') {
+          sanitized[field] = sanitizeHTML(value);
+
+          // Log if sanitization changed the input (potential XSS attempt)
+          if (sanitized[field] !== value) {
+            await logSecurityEvent({
+              type: 'input_sanitized',
+              sourceIp: clientIp,
+              userId: req.user?.id,
+              endpoint: req.path,
+              userAgent: req.get('user-agent'),
+              details: {
+                field,
+                original_length: value.length,
+                sanitized_length: sanitized[field].length
+              },
+              action: 'sanitized',
+              severity: 'low'
+            });
+          }
+        } else {
+          sanitized[field] = value;
+        }
+      }
+
+      // If validation errors, reject request
+      if (errors.length > 0) {
+        await logSecurityEvent({
+          type: 'input_validation_failure',
+          sourceIp: clientIp,
+          userId: req.user?.id,
+          endpoint: req.path,
+          userAgent: req.get('user-agent'),
+          details: {
+            errors,
+            fields: Object.keys(schema)
+          },
+          action: 'rejected',
+          severity: 'medium'
+        });
+
+        return res.status(400).json({
+          error: 'Validation failed',
+          details: errors
+        });
+      }
+
+      // Replace req.body with sanitized values
+      req.body = { ...req.body, ...sanitized };
+      req.validationPassed = true;
+
+      next();
+
+    } catch (error) {
+      console.error('[INPUT VALIDATION ERROR]', error);
+
+      await logSecurityEvent({
+        type: 'input_validation_error',
+        sourceIp: clientIp,
+        userId: req.user?.id,
+        endpoint: req.path,
+        userAgent: req.get('user-agent'),
+        details: {
+          error: error.message
+        },
+        action: 'rejected',
+        severity: 'high'
+      });
+
+      return res.status(500).json({
+        error: 'Validation failed',
+        message: 'An error occurred during input validation'
+      });
+    }
+  };
+}
+
+module.exports = {
+  createInputValidationMiddleware,
+  sanitizeHTML,
+  isValidEmail,
+  isValidURL,
+  LENGTH_LIMITS
+};
diff --git a/src/middleware/rate-limit.middleware.js b/src/middleware/rate-limit.middleware.js
new file mode 100644
index 00000000..f71e8d1a
--- /dev/null
+++ b/src/middleware/rate-limit.middleware.js
@@ -0,0 +1,96 @@
+/**
+ * Rate Limiting Middleware (inst_045 - Quick Win Version)
+ * Prevents brute force, DoS, and spam attacks
+ *
+ * QUICK WIN: In-memory rate limiting (no Redis required)
+ * Full version in Phase 4 will use Redis for distributed rate limiting
+ */
+
+const rateLimit = require('express-rate-limit');
+const { logSecurityEvent, getClientIp } = require('../utils/security-logger');
+
+/**
+ * Create rate limiter with custom handler for security logging
+ */
+function createRateLimiter(options) {
+  const {
+    windowMs,
+    max,
+    tier,
+    message,
+    skipSuccessfulRequests = false
+  } = options;
+
+  return rateLimit({
+    windowMs,
+    max,
+    skipSuccessfulRequests,
+    standardHeaders: true,
+    legacyHeaders: false,
+    handler: async (req, res) => {
+      const clientIp = getClientIp(req);
+
+      await logSecurityEvent({
+        type: 'rate_limit_exceeded',
+        sourceIp: clientIp,
+        userId: req.user?.id || req.user?.userId,
+        endpoint: req.path,
+        userAgent: req.get('user-agent'),
+        details: {
+          tier,
+          limit: max,
+          window_ms: windowMs,
+          window_display: `${windowMs / 1000} seconds`
+        },
+        action: 'blocked',
+        severity: 'medium'
+      });
+
+      res.status(429).json({
+        error: 'Rate limit exceeded',
+        message: message || `Too many requests. Limit: ${max} per ${windowMs / 1000} seconds`,
+        retryAfter: Math.ceil(windowMs / 1000)
+      });
+    }
+  });
+}
+
+/**
+ * Public endpoints: 100 requests per 15 minutes per IP (inst_045)
+ */
+const publicRateLimiter = createRateLimiter({
+  windowMs: 15 * 60 * 1000,  // 15 minutes
+  max: 100,
+  tier: 'public',
+  message: 'Too many requests from this IP. Please try again later.'
+});
+
+/**
+ * Form submissions: 5 requests per minute per IP (inst_043)
+ * More restrictive for form spam prevention
+ */
+const formRateLimiter = createRateLimiter({
+  windowMs: 60 * 1000,  // 1 minute
+  max: 5,
+  tier: 'form',
+  message: 'Too many form submissions. Please wait before submitting again.'
+});
+
+/**
+ * Authentication endpoints: 10 attempts per 5 minutes
+ * Prevents brute force authentication attacks
+ */
+const authRateLimiter = createRateLimiter({
+  windowMs: 5 * 60 * 1000,  // 5 minutes
+  max: 10,
+  tier: 'auth',
+  message: 'Too many authentication attempts. Please try again later.',
+  skipSuccessfulRequests: true  // Don't count successful logins
+});
+
+module.exports = {
+  publicRateLimiter,
+  formRateLimiter,
+  authRateLimiter,
+  createRateLimiter
+};
diff --git a/src/middleware/response-sanitization.middleware.js b/src/middleware/response-sanitization.middleware.js
new file mode 100644
index 00000000..0b73985a
--- /dev/null
+++ b/src/middleware/response-sanitization.middleware.js
@@ -0,0 +1,115 @@
+/**
+ * Response Sanitization Middleware (inst_013, inst_045)
+ * Prevents information disclosure in error responses
+ *
+ * QUICK WIN: Hide stack traces and sensitive data in production
+ * NEVER expose: stack traces, internal paths, environment details
+ */
+
+/**
+ * Sanitize error responses
+ * Production: Generic error messages only
+ * Development: More detailed errors for debugging
+ */
+function sanitizeErrorResponse(err, req, res, next) {
+  const isProduction = process.env.NODE_ENV === 'production';
+
+  // Log full error details internally (always)
+  console.error('[ERROR]', {
+    message: err.message,
+    stack: err.stack,
+    path: req.path,
+    method: req.method,
+    ip: req.ip,
+    user: req.user?.id || req.user?.userId,
+    timestamp: new Date().toISOString()
+  });
+
+  // Determine status code
+  const statusCode = err.statusCode || err.status || 500;
+
+  // Generic error messages for common status codes
+  const genericErrors = {
+    400: 'Bad Request',
+    401: 'Unauthorized',
+    403: 'Forbidden',
+    404: 'Not Found',
+    405: 'Method Not Allowed',
+    413: 'Payload Too Large',
+    429: 'Too Many Requests',
+    500: 'Internal Server Error',
+    502: 'Bad Gateway',
+    503: 'Service Unavailable'
+  };
+
+  // Production: Generic error messages only
+  if (isProduction) {
+    return res.status(statusCode).json({
+      error: genericErrors[statusCode] || 'Error',
+      message: err.message || 'An error occurred',
+      // NEVER include in production: stack, file paths, internal details
+    });
+  }
+
+  // Development: More detailed errors (but still sanitized)
+  res.status(statusCode).json({
+    error: err.name || 'Error',
+    message: err.message,
+    statusCode,
+    // Stack trace only in development
+    stack: process.env.NODE_ENV === 'development' ? err.stack : undefined
+  });
+}
+
+/**
+ * Remove sensitive fields from objects
+ * Useful for sanitizing database results before sending to client
+ */
+function removeSensitiveFields(data, sensitiveFields = ['password', 'passwordHash', 'apiKey', 'secret', 'token']) {
+  if (Array.isArray(data)) {
+    return data.map(item => removeSensitiveFields(item, sensitiveFields));
+  }
+
+  if (typeof data === 'object' && data !== null) {
+    const sanitized = { ...data };
+
+    // Remove sensitive fields
+    for (const field of sensitiveFields) {
+      delete sanitized[field];
+    }
+
+    // Recursively sanitize nested objects
+    for (const key in sanitized) {
+      if (typeof sanitized[key] === 'object' && sanitized[key] !== null) {
+        sanitized[key] = removeSensitiveFields(sanitized[key], sensitiveFields);
+      }
+    }
+
+    return sanitized;
+  }
+
+  return data;
+}
+
+/**
+ * Middleware to sanitize response data
+ * Apply before sending responses with user/database data
+ */
+function sanitizeResponseData(req, res, next) {
+  // Store original json method
+  const originalJson = res.json.bind(res);
+
+  // Override json method to sanitize data
+  res.json = function(data) {
+    const sanitized = removeSensitiveFields(data);
+    return originalJson(sanitized);
+  };
+
+  next();
+}
+
+module.exports = {
+  sanitizeErrorResponse,
+  removeSensitiveFields,
+  sanitizeResponseData
+};
diff --git a/src/middleware/security-headers.middleware.js b/src/middleware/security-headers.middleware.js
new file mode 100644
index 00000000..7b7a0f22
--- /dev/null
+++ b/src/middleware/security-headers.middleware.js
@@ -0,0 +1,63 @@
+/**
+ * Security Headers Middleware (inst_044 - Quick Win Version)
+ * Implements comprehensive HTTP security headers
+ *
+ * QUICK WIN: Low effort, high value security improvement
+ * - Prevents XSS, clickjacking, MIME sniffing attacks
+ * - Enforces HTTPS, limits referrer leakage
+ * - Restricts dangerous browser features
+ */
+
+/**
+ * Apply security headers to all HTTP responses
+ */
+function securityHeadersMiddleware(req, res, next) {
+  // Content Security Policy (enforces inst_008 at HTTP level)
+  // Allows Tailwind inline styles, blocks inline scripts
+  res.setHeader(
+    'Content-Security-Policy',
+    [
+      "default-src 'self'",
+      "script-src 'self'",
+      "style-src 'self' 'unsafe-inline'",  // Tailwind requires inline styles
+      "img-src 'self' data: https:",
+      "font-src 'self' https://fonts.gstatic.com https://cdnjs.cloudflare.com",
+      "connect-src 'self'",
+      "frame-ancestors 'none'",
+      "base-uri 'self'",
+      "form-action 'self'",
+      "upgrade-insecure-requests",
+      "block-all-mixed-content"
+    ].join('; ')
+  );
+
+  // Prevent MIME type sniffing attacks
+  res.setHeader('X-Content-Type-Options', 'nosniff');
+
+  // Prevent clickjacking via iframes
+  res.setHeader('X-Frame-Options', 'DENY');
+
+  // Enable browser XSS filter (legacy browsers)
+  res.setHeader('X-XSS-Protection', '1; mode=block');
+
+  // Enforce HTTPS (HSTS) - only add if HTTPS is available
+  if (req.secure || req.get('x-forwarded-proto') === 'https') {
+    res.setHeader(
+      'Strict-Transport-Security',
+      'max-age=31536000; includeSubDomains'  // 1 year
+    );
+  }
+
+  // Limit referrer information leakage
+  res.setHeader('Referrer-Policy', 'strict-origin-when-cross-origin');
+
+  // Restrict dangerous browser features
+  res.setHeader(
+    'Permissions-Policy',
+    'geolocation=(), microphone=(), camera=(), payment=()'
+  );
+
+  next();
+}
+
+module.exports = { securityHeadersMiddleware };
diff --git a/src/utils/security-logger.js b/src/utils/security-logger.js
new file mode 100644
index 00000000..dd4f2a04
--- /dev/null
+++ b/src/utils/security-logger.js
@@ -0,0 +1,71 @@
+/**
+ * Security Event Logger (inst_046 - Quick Win Version)
+ * Centralized logging for all security events
+ *
+ * QUICK WIN: Simple file-based logging with JSON format
+ * Full version in Phase 5 will add ProtonMail/Signal alerts
+ */
+
+const fs = require('fs').promises;
+const path = require('path');
+
+const SECURITY_LOG_PATH = '/var/log/tractatus/security-audit.log';
+
+/**
+ * Log a security event to audit trail
+ *
+ * @param {Object} event - Security event details
+ * @param {string} event.type - Event type (e.g., 'rate_limit_violation')
+ * @param {string} event.sourceIp - Source IP address
+ * @param {string} event.userId - User ID (if authenticated)
+ * @param {string} event.endpoint - Request endpoint
+ * @param {string} event.userAgent - User agent string
+ * @param {Object} event.details - Additional event details
+ * @param {string} event.action - Action taken (e.g., 'blocked', 'logged')
+ * @param {string} event.severity - Severity level ('low', 'medium', 'high', 'critical')
+ */
+async function logSecurityEvent(event) {
+  const logEntry = {
+    timestamp: new Date().toISOString(),
+    event_type: event.type || 'unknown',
+    source_ip: event.sourceIp || 'unknown',
+    user_id: event.userId || 'anonymous',
+    endpoint: event.endpoint || 'unknown',
+    user_agent: event.userAgent || 'unknown',
+    violation_details: event.details || {},
+    action_taken: event.action || 'logged',
+    severity: event.severity || 'medium'
+  };
+
+  const logLine = JSON.stringify(logEntry) + '\n';
+
+  try {
+    // Ensure log directory exists
+    const logDir = path.dirname(SECURITY_LOG_PATH);
+    await fs.mkdir(logDir, { recursive: true, mode: 0o750 });
+
+    // Append to log file
+    await fs.appendFile(SECURITY_LOG_PATH, logLine, { encoding: 'utf-8' });
+  } catch (error) {
+    // Fallback to console if file logging fails
+    console.error('[SECURITY LOGGER ERROR]', error.message);
+    console.error('[SECURITY EVENT]', logEntry);
+  }
+}
+
+/**
+ * Helper: Extract client IP from request (handles proxies)
+ */
+function getClientIp(req) {
+  return (
+    req.ip ||
+    req.headers['x-forwarded-for']?.split(',')[0]?.trim() ||
+    req.connection.remoteAddress ||
+    'unknown'
+  );
+}
+
+module.exports = {
+  logSecurityEvent,
+  getClientIp
+};