Multi-layered security implementation for secure credential storage.

• bcrypt hashing: Salt-based password hashing
• Session tokens: Secure token-based authentication
• Input validation: Server-side request validation

• AES-256: Fernet symmetric encryption
• PBKDF2: 100,000 iterations for key derivation
• Master keys: Password-derived encryption keys

• Prepared statements: SQL injection prevention
• Foreign keys: Data integrity constraints
• Indexes: Performance optimization
• Encrypted storage: All sensitive data encrypted

1. User password → bcrypt hash (stored)
2. User password + salt → PBKDF2 → key derivation key
3. Master key + key derivation key → encrypted master key (stored)
4. Vault data + master key → encrypted vault data (stored)

• No plaintext password storage
• Encrypted sensitive data at rest
• Master keys cleared on logout
• Secure session management

• Rainbow table attacks (salted hashes)
• Brute force attacks (bcrypt complexity)
• SQL injection (prepared statements)
• Data breaches (encrypted storage)

For production deployment:

• HTTPS/TLS for all communications
• Rate limiting on authentication endpoints
• Security headers (CSP, HSTS, etc.)
• Regular security audits
• Proper logging and monitoring

• Secure execution environment
• PostgreSQL server security
• User follows security best practices
• No malware on execution system

1. Defense in Depth: Multiple security layers
2. Least Privilege: Minimal database permissions
3. Secure Defaults: Strong cryptographic parameters
4. Input Validation: All user inputs sanitized
5. Error Handling: No sensitive information in error messages