# Boundaries
## Purpose
Security boundary enforcement and cryptographic operations providing maximum isolation and protection.
## Key Components
- **crypto.py**: Cryptographic key management, state encryption, and audit signing with industry-standard algorithms
- **filesystem.py**: Comprehensive filesystem boundary enforcement with path validation and resource monitoring
## Architecture & Dependencies
**External**: cryptography library for AES-GCM encryption and ECDSA signatures, psutil for resource monitoring
**Internal**: Types system for security contexts, contracts system for validation enforcement
**Patterns**: Factory pattern for key generation, Strategy pattern for encryption algorithms
## Critical Considerations
- **Security**: All cryptographic operations use industry-standard algorithms with proper key management
- **Performance**: O(1) key operations, O(n) encryption/decryption, optimized for high-frequency usage
- **Integration**: Seamless integration with contract system for automatic security validation
## Related Documentation
- [Security Framework Documentation](../../docs/security/SECURITY_FRAMEWORK.md)
- [Architecture Overview](../../ARCHITECTURE.md)
