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docs/architecture/security.rst

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+Security Architecture
+===================
+
+This document outlines the security architecture of the AI-Writer platform, including authentication, authorization, data protection, and security best practices.
+
+Authentication and Authorization
+------------------------------
+
+User Authentication
+~~~~~~~~~~~~~~~~~
+
+AI-Writer implements a multi-layered authentication system:
+
+1. **Password-based Authentication**
+   
+   * Passwords are hashed using bcrypt with appropriate work factors
+   * Password complexity requirements are enforced
+   * Account lockout after multiple failed attempts
+   * Password reset via secure email workflow
+
+2. **API Key Authentication**
+   
+   * Unique API keys for programmatic access
+   * Keys are stored using secure hashing
+   * Keys can be scoped to specific permissions
+   * Keys can be revoked at any time
+
+3. **OAuth 2.0 (for multi-user deployments)**
+   
+   * Standard OAuth 2.0 flow with authorization code
+   * JWT tokens with appropriate expiration
+   * Refresh token rotation
+   * PKCE for public clients
+
+Authorization Model
+~~~~~~~~~~~~~~~~
+
+The platform uses a role-based access control (RBAC) system:
+
+1. **User Roles**
+   
+   * **Admin**: Full system access
+   * **Editor**: Content creation and editing
+   * **Viewer**: Read-only access to content
+   * **API**: Programmatic access with limited scope
+
+2. **Permission Scopes**
+   
+   * `content:read`: View content
+   * `content:write`: Create and edit content
+   * `content:delete`: Delete content
+   * `user:read`: View user information
+   * `user:write`: Modify user information
+   * `settings:read`: View settings
+   * `settings:write`: Modify settings
+   * `api:manage`: Manage API keys
+
+3. **Resource-level Permissions**
+   
+   * Permissions are checked at the resource level
+   * Users can only access their own content
+   * Sharing functionality with explicit permissions
+
+Data Protection
+-------------
+
+Encryption
+~~~~~~~~~
+
+1. **Data in Transit**
+   
+   * TLS 1.3 for all communications
+   * Strong cipher suites
+   * HSTS implementation
+   * Certificate pinning for API clients
+
+2. **Data at Rest**
+   
+   * Database encryption
+   * Encrypted file storage
+   * Secure key management
+   * Regular key rotation
+
+3. **Sensitive Data**
+   
+   * API keys and credentials are encrypted
+   * PII is encrypted with separate keys
+   * Encryption keys are properly secured
+
+API Key Security
+~~~~~~~~~~~~~~
+
+1. **Key Generation**
+   
+   * Keys are generated using cryptographically secure random functions
+   * Sufficient entropy (256 bits)
+   * Keys follow a consistent format for validation
+
+2. **Key Storage**
+   
+   * Only key hashes are stored in the database
+   * Secure comparison for validation
+   * Keys are never logged or exposed in error messages
+
+3. **Key Management**
+   
+   * Keys can be rotated regularly
+   * Unused keys are automatically expired
+   * Key usage is logged for audit purposes
+
+Secure Development Practices
+--------------------------
+
+Input Validation
+~~~~~~~~~~~~~~
+
+1. **API Input Validation**
+   
+   * All input is validated against schemas
+   * Type checking and constraint validation
+   * Protection against injection attacks
+   * Input sanitization where appropriate
+
+2. **Content Validation**
+   
+   * Content is scanned for malicious elements
+   * HTML/Markdown sanitization
+   * File upload validation and scanning
+
+3. **Error Handling**
+   
+   * Secure error handling that doesn't leak sensitive information
+   * Consistent error responses
+   * Detailed internal logging for troubleshooting
+
+Dependency Management
+~~~~~~~~~~~~~~~~~~
+
+1. **Dependency Scanning**
+   
+   * Regular scanning for vulnerable dependencies
+   * Automated updates for security patches
+   * Dependency pinning for stability
+
+2. **Minimal Dependencies**
+   
+   * Only necessary dependencies are included
+   * Regular dependency audits
+   * Preference for well-maintained libraries
+
+3. **Containerization**
+   
+   * Minimal base images
+   * Non-root container execution
+   * Image scanning for vulnerabilities
+
+Logging and Monitoring
+--------------------
+
+Security Logging
+~~~~~~~~~~~~~~
+
+1. **Authentication Events**
+   
+   * Login attempts (successful and failed)
+   * Password changes and resets
+   * API key creation and usage
+   * Session management events
+
+2. **Authorization Events**
+   
+   * Permission checks
+   * Access denials
+   * Privilege escalation
+   * Role changes
+
+3. **System Events**
+   
+   * Configuration changes
+   * Service starts and stops
+   * Database migrations
+   * Backup and restore operations
+
+Monitoring and Alerting
+~~~~~~~~~~~~~~~~~~~~~
+
+1. **Security Monitoring**
+   
+   * Real-time monitoring for suspicious activities
+   * Anomaly detection for unusual patterns
+   * Rate limiting and abuse detection
+   * Geographic anomaly detection
+
+2. **Performance Monitoring**
+   
+   * Resource usage tracking
+   * API response time monitoring
+   * Error rate monitoring
+   * Database performance tracking
+
+3. **Alerting**
+   
+   * Immediate alerts for security incidents
+   * Escalation procedures
+   * On-call rotation
+   * Incident response playbooks
+
+Compliance and Privacy
+--------------------
+
+Data Governance
+~~~~~~~~~~~~~
+
+1. **Data Classification**
+   
+   * Clear classification of data sensitivity
+   * Handling procedures for each classification
+   * Access controls based on classification
+   * Retention policies by data type
+
+2. **Data Minimization**
+   
+   * Only necessary data is collected
+   * Automatic data pruning
+   * Anonymization where possible
+   * Purpose limitation
+
+3. **User Consent**
+   
+   * Clear consent mechanisms
+   * Granular permission options
+   * Easy consent withdrawal
+   * Consent records
+
+Privacy Features
+~~~~~~~~~~~~~
+
+1. **User Privacy Controls**
+   
+   * Data export functionality
+   * Account deletion
+   * Privacy settings management
+   * Usage tracking opt-out
+
+2. **Data Portability**
+   
+   * Export in standard formats
+   * Complete data export
+   * Machine-readable formats
+   * Import capabilities
+
+3. **Transparency**
+   
+   * Clear privacy policy
+   * Data usage explanations
+   * Third-party data sharing disclosure
+   * Processing activities documentation
+
+Security Testing
+--------------
+
+Vulnerability Management
+~~~~~~~~~~~~~~~~~~~~~
+
+1. **Security Testing**
+   
+   * Regular penetration testing
+   * Static application security testing (SAST)
+   * Dynamic application security testing (DAST)
+   * Software composition analysis (SCA)
+
+2. **Bug Bounty Program**
+   
+   * Responsible disclosure policy
+   * Security researcher engagement
+   * Vulnerability triage process
+   * Remediation tracking
+
+3. **Security Reviews**
+   
+   * Code reviews with security focus
+   * Architecture security reviews
+   * Threat modeling
+   * Security design reviews
+
+Incident Response
+~~~~~~~~~~~~~~~
+
+1. **Incident Response Plan**
+   
+   * Defined incident response procedures
+   * Roles and responsibilities
+   * Communication templates
+   * Escalation paths
+
+2. **Breach Notification**
+   
+   * Legal compliance with notification requirements
+   * User communication plan
+   * Regulatory reporting procedures
+   * Post-incident analysis
+
+3. **Recovery Procedures**
+   
+   * Backup and restore testing
+   * Business continuity planning
+   * Disaster recovery procedures
+   * Service level objectives
+
+Security Roadmap
+--------------
+
+Planned Security Enhancements
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+1. **Short-term (0-6 months)**
+   
+   * Implement multi-factor authentication
+   * Enhance API key management
+   * Improve security logging
+   * Conduct initial penetration test
+
+2. **Medium-term (6-12 months)**
+   
+   * Implement security information and event management (SIEM)
+   * Enhance data encryption
+   * Develop comprehensive security training
+   * Implement automated security testing in CI/CD
+
+3. **Long-term (12+ months)**
+   
+   * Achieve SOC 2 compliance
+   * Implement advanced threat protection
+   * Develop zero-trust architecture
+   * Enhance privacy features for international compliance