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+# Security Documentation
+
+## Overview
+
+This document outlines the comprehensive security measures implemented in the Bootstrap App. The application follows industry best practices and security standards to protect against common threats and vulnerabilities.
+
+## Security Architecture
+
+### Defense in Depth
+
+The application implements multiple layers of security:
+
+1. **Network Security**: HTTPS, CORS, security headers
+2. **Authentication**: JWT token-based authentication
+3. **Authorization**: Role-based access control (RBAC)
+4. **Input Security**: Validation, sanitization, size limits
+5. **Data Security**: Encryption, secure storage
+6. **Monitoring**: Audit logging, security event tracking
+7. **Infrastructure**: Secure deployment practices
+
+## Authentication System
+
+### JWT (JSON Web Tokens)
+
+**Implementation**:
+- RS256/HS256 signing algorithms
+- Configurable token expiration (default: 24 hours access, 7 days refresh)
+- Secure token storage and transmission
+- Token revocation support
+
+**Security Features**:
+- Cryptographically secure secret generation
+- Token payload minimization
+- Automatic token expiration
+- Refresh token rotation
+
+**Configuration**:
+```env
+JWT_SECRET=base64-encoded-secret-64-bytes
+JWT_ACCESS_TTL_HOURS=24
+JWT_REFRESH_TTL_DAYS=7
+JWT_ISSUER=omega-server
+```
+
+### Password Security
+
+**Hashing**:
+- bcrypt with cost factor 12
+- Salt automatically generated per password
+- Resistant to rainbow table attacks
+
+**Password Policy**:
+- Minimum 8 characters
+- Must contain uppercase, lowercase, number, special character
+- Common password detection
+- Password strength scoring (0-100)
+
+**Additional Security**:
+- Account lockout after failed attempts
+- Password history prevention
+- Secure password reset flow
+
+## Authorization System
+
+### Role-Based Access Control (RBAC)
+
+**Components**:
+- **Users**: Individual user accounts
+- **Roles**: Collections of permissions (admin, user, viewer)
+- **Permissions**: Granular access rights (user:create, user:read, etc.)
+
+**Permission Format**:
+```
+resource:action
+Examples: user:create, role:delete, system:admin
+```
+
+**Default Roles**:
+- **admin**: Full system access
+- **user**: Standard user privileges
+- **viewer**: Read-only access
+
+### Permission Checking
+
+**Implementation**:
+```go
+// Middleware-based permission checking
+app.Get("/api/v1/users", authMW.HasPermission("user:read"), controller.GetUsers)
+
+// Service-level permission checking
+if !user.HasPermission("user:create") {
+    return errors.New("insufficient permissions")
+}
+```
+
+## Input Security
+
+### Validation & Sanitization
+
+**Input Validation**:
+- JSON schema validation
+- Type checking
+- Range validation
+- Format validation (email, UUID, etc.)
+
+**Input Sanitization**:
+- HTML entity encoding
+- SQL injection prevention
+- XSS protection
+- Path traversal prevention
+
+**Request Limits**:
+- Maximum request size: 10MB
+- Request timeout: 30 seconds
+- Header size limits
+- URL length limits
+
+### Content Security
+
+**Content-Type Validation**:
+- Strict content-type checking
+- File upload validation
+- MIME type verification
+- Extension whitelist
+
+**File Upload Security**:
+- Virus scanning integration points
+- File size limits
+- Storage isolation
+- Access control
+
+## Network Security
+
+### HTTPS/TLS
+
+**Requirements**:
+- TLS 1.2+ minimum
+- Strong cipher suites
+- Perfect Forward Secrecy
+- HSTS headers
+
+**Certificate Management**:
+- Automated certificate renewal
+- Certificate pinning options
+- Certificate transparency monitoring
+
+### CORS (Cross-Origin Resource Sharing)
+
+**Configuration**:
+```env
+CORS_ALLOWED_ORIGIN=https://yourdomain.com,https://app.yourdomain.com
+```
+
+**Security Headers**:
+- Strict origin validation
+- Credential handling
+- Preflight request validation
+
+### Security Headers
+
+**Implemented Headers**:
+```http
+X-Content-Type-Options: nosniff
+X-Frame-Options: DENY
+X-XSS-Protection: 1; mode=block
+Strict-Transport-Security: max-age=31536000; includeSubDomains; preload
+Content-Security-Policy: default-src 'self'
+Referrer-Policy: strict-origin-when-cross-origin
+```
+
+## Rate Limiting
+
+### Multi-Layer Rate Limiting
+
+**Global Rate Limiting**:
+- 100 requests per minute per IP
+- Configurable limits per endpoint
+- Token bucket algorithm
+
+**Authentication Rate Limiting**:
+- 5 login attempts per 15 minutes
+- Progressive delays for failed attempts
+- Account lockout protection
+
+**API Rate Limiting**:
+- Per-user rate limits
+- Per-endpoint specific limits
+- Burst capacity handling
+
+### Implementation
+
+```go
+// Global rate limiting
+app.Use(securityMW.RateLimit(100, 1*time.Minute))
+
+// Authentication rate limiting
+app.Post("/auth/login", securityMW.AuthRateLimit(), authController.Login)
+```
+
+## Data Protection
+
+### Encryption
+
+**Encryption at Rest**:
+- Database field-level encryption for sensitive data
+- AES-256-GCM encryption
+- Secure key management
+
+**Encryption in Transit**:
+- TLS 1.2+ for all communications
+- Certificate validation
+- Perfect Forward Secrecy
+
+**Key Management**:
+```env
+ENCRYPTION_KEY=32-character-hex-key  # 256-bit key
+```
+
+### Data Classification
+
+**Sensitive Data Types**:
+- Passwords (hashed with bcrypt)
+- Personal information (encrypted)
+- Authentication tokens (secure storage)
+- System secrets (environment variables)
+
+**Data Handling**:
+- Minimal data collection
+- Data retention policies
+- Secure data deletion
+- Access logging
+
+## Audit & Monitoring
+
+### Audit Logging
+
+**Logged Events**:
+- Authentication attempts (success/failure)
+- Authorization decisions
+- Data access and modifications
+- Administrative actions
+- Security events
+
+**Audit Log Format**:
+```json
+{
+  "id": "uuid",
+  "userId": "user-id",
+  "action": "create",
+  "resource": "user",
+  "resourceId": "target-user-id",
+  "success": true,
+  "ipAddress": "192.168.1.1",
+  "userAgent": "Browser/1.0",
+  "timestamp": "2024-01-01T12:00:00Z",
+  "details": {...}
+}
+```
+
+### Security Event Monitoring
+
+**Event Types**:
+- Brute force attempts
+- Privilege escalation attempts
+- Suspicious activity patterns
+- Rate limit violations
+- Authentication anomalies
+
+**Response Actions**:
+- Automatic account lockout
+- Rate limit enforcement
+- Security team notifications
+- Event correlation
+
+## Vulnerability Management
+
+### Security Testing
+
+**Automated Testing**:
+- Static code analysis
+- Dependency vulnerability scanning
+- Security unit tests
+- Integration security tests
+
+**Manual Testing**:
+- Penetration testing
+- Code review
+- Security architecture review
+- Threat modeling
+
+### Dependency Management
+
+**Security Practices**:
+- Regular dependency updates
+- Vulnerability scanning
+- License compliance
+- Supply chain security
+
+**Go Module Security**:
+```bash
+go mod tidy
+go list -m -u all
+go mod download
+```
+
+## Incident Response
+
+### Security Incident Types
+
+**Authentication Incidents**:
+- Brute force attacks
+- Credential stuffing
+- Account takeover
+
+**Authorization Incidents**:
+- Privilege escalation
+- Unauthorized access
+- Permission bypass
+
+**Data Incidents**:
+- Data breach
+- Data exposure
+- Data integrity issues
+
+### Response Procedures
+
+**Detection**:
+- Automated monitoring alerts
+- Log analysis
+- User reports
+- Security team monitoring
+
+**Response**:
+1. Incident containment
+2. Impact assessment
+3. Evidence preservation
+4. Stakeholder notification
+5. Recovery procedures
+6. Post-incident review
+
+## Secure Configuration
+
+### Environment Security
+
+**Production Settings**:
+```env
+GO_ENV=production
+DEBUG_MODE=false
+LOG_LEVEL=WARN
+```
+
+**Secret Management**:
+- Environment variable storage
+- Secure secret generation
+- Secret rotation procedures
+- Access control for secrets
+
+### Database Security
+
+**Security Measures**:
+- Connection encryption
+- Prepared statements (SQL injection prevention)
+- Access control
+- Backup encryption
+
+**Configuration**:
+- Minimal database privileges
+- Regular security updates
+- Connection pooling limits
+- Query logging for monitoring
+
+## Compliance & Standards
+
+### Security Standards
+
+**Frameworks**:
+- OWASP Top 10 compliance
+- NIST Cybersecurity Framework
+- ISO 27001 principles
+- PCI DSS guidelines (where applicable)
+
+**Security Controls**:
+- Access control (AC)
+- Audit and accountability (AU)
+- Configuration management (CM)
+- Identification and authentication (IA)
+- System and communications protection (SC)
+
+### Privacy Protection
+
+**Data Protection**:
+- GDPR compliance considerations
+- Data minimization principles
+- User consent management
+- Right to deletion
+
+**Privacy by Design**:
+- Default privacy settings
+- Data encryption
+- Access logging
+- User control over data
+
+## Deployment Security
+
+### Secure Deployment
+
+**Build Security**:
+- Secure build pipeline
+- Dependency verification
+- Binary signing
+- Vulnerability scanning
+
+**Runtime Security**:
+- Minimal attack surface
+- Process isolation
+- Resource limits
+- Security monitoring
+
+### Infrastructure Security
+
+**Server Hardening**:
+- OS security updates
+- Unnecessary service removal
+- Firewall configuration
+- Intrusion detection
+
+**Container Security** (if applicable):
+- Minimal base images
+- Security scanning
+- Runtime protection
+- Resource limits
+
+## Security Maintenance
+
+### Regular Security Tasks
+
+**Daily**:
+- Security log review
+- Incident monitoring
+- Threat intelligence updates
+
+**Weekly**:
+- Vulnerability assessment
+- Security metric review
+- Access review
+
+**Monthly**:
+- Security training updates
+- Policy review
+- Penetration testing
+- Security architecture review
+
+### Security Updates
+
+**Update Process**:
+1. Security advisory monitoring
+2. Impact assessment
+3. Testing in staging
+4. Coordinated deployment
+5. Verification testing
+
+**Emergency Updates**:
+- Critical vulnerability response
+- Out-of-band patching
+- Incident coordination
+- Communication procedures
+
+## Security Contact Information
+
+### Reporting Security Issues
+
+**Internal Team**:
+- Security team email: security@company.com
+- Incident hotline: +1-XXX-XXX-XXXX
+- Escalation procedures: [Internal documentation]
+
+**External Researchers**:
+- Security disclosure policy
+- Responsible disclosure program
+- Bug bounty program (if applicable)
+- PGP key for encrypted communication
+
+### Security Training
+
+**Developer Training**:
+- Secure coding practices
+- Security testing procedures
+- Incident response training
+- Regular security updates
+
+**User Training**:
+- Security awareness
+- Password best practices
+- Phishing recognition
+- Incident reporting
+
+## Conclusion
+
+This security documentation outlines the comprehensive security measures implemented in the Bootstrap App. Regular review and updates of these security practices ensure ongoing protection against evolving threats.
+
+For questions about security implementations or to report security issues, please contact the security team through the designated channels.
+
+**Last Updated**: [Current Date]
+**Next Review**: [Review Date]
+**Document Version**: 1.0