This library implements several security measures to ensure safe cryptographic operations:

1. Cryptographically Secure Randomness: Uses Python's secrets module for all random number generation
2. Timing-Safe Comparisons: Uses hmac.compare_digest() to prevent timing attacks
3. Input Validation: Comprehensive validation of all inputs to prevent injection attacks
4. Secure Hash Algorithms: Only allows secure hash algorithms (SHA-256, SHA-384, SHA-512, SHA-3, BLAKE2)
5. Zero-Knowledge Proofs: Proper Schnorr signatures on secp256k1 for proving knowledge without revelation

• No Plaintext Storage: The secure CLI never stores sensitive values on disk
• Secure File Permissions: All storage files use 0600 permissions (owner read/write only)
• Secure Input: Sensitive values are prompted without echo using getpass
• Migration Tool: Safe migration from legacy insecure format to secure format

• Elliptic Curve Cryptography: Uses secp256k1 (same as Bitcoin)
• Non-Interactive Proofs: Fiat-Shamir heuristic for non-interactive ZKPs
• Proper Challenge Generation: Cryptographically secure challenge derivation
• Point Validation: All elliptic curve points are validated before use

1. Use the Secure CLI: Always use commit-reveal-secure instead of the legacy CLI
2. Migrate Legacy Data: Use commit-reveal-migrate to upgrade from old formats
3. Secure Environment: Run in a trusted environment with proper access controls
4. Regular Updates: Keep the library updated to the latest version
5. Backup Management: Securely handle any backups of commitment data

1. Input Validation: Always validate inputs using the provided validation functions
2. Error Handling: Handle ValidationError and SecurityError appropriately
3. Memory Management: Clear sensitive data when no longer needed
4. ZKP Usage: Understand the security model of zero-knowledge proofs before use
5. Testing: Use the comprehensive test suite for any modifications

The library supports only cryptographically secure hash algorithms:

• Recommended: SHA-256 (default), SHA-384, SHA-512
• Alternative: SHA-3 variants, BLAKE2
• Forbidden: MD5, SHA-1 (deprecated and insecure)

While the ZKP implementation is cryptographically sound, consider these limitations:

1. Simplified Implementation: This is not a general-purpose ZKP library
2. Single-Use Proofs: Each proof should only be verified once
3. Public Key Reuse: Don't reuse public keys across different commitments
4. Implementation Maturity: Consider established ZKP libraries for high-stakes applications

The library is designed to resist:

• Timing Attacks: Constant-time comparisons for reveal operations
• Side-Channel Attacks: Secure random number generation
• Injection Attacks: Comprehensive input validation
• Directory Traversal: Filename sanitization in CLI
• Information Leakage: No plaintext storage in secure mode

1. Trusted Environment: The library runs in a trusted environment
2. Secure Transport: Network communication (if any) uses secure channels
3. Access Control: Proper file system permissions are maintained
4. Hardware Security: The underlying hardware is not compromised

1. Hardware Attacks: Physical access to the device
2. Operating System Compromise: Kernel-level attacks
3. Network Security: Secure communication between parties
4. Key Management: Long-term cryptographic key storage

If you discover a security vulnerability, please report it responsibly:

• Email: security@example.com (replace with actual contact)
• PGP Key: [Provide PGP public key for encrypted communication]
• Response Time: We aim to respond within 48 hours

1. Describe the Vulnerability: Clear description of the issue
2. Proof of Concept: Steps to reproduce (if safe to do so)
3. Impact Assessment: Potential impact and affected versions
4. Suggested Fix: Proposed solution (if you have one)

1. Acknowledgment: Confirmation of receipt within 48 hours
2. Assessment: Initial assessment within 5 business days
3. Fix Development: Security patch development
4. Disclosure: Coordinated disclosure once patch is available
5. Credit: Public acknowledgment of responsible disclosure (if desired)

• Day 0: Vulnerability reported
• Day 1-2: Acknowledgment and initial triage
• Day 3-7: Detailed assessment and impact analysis
• Day 8-30: Security patch development and testing
• Day 31+: Coordinated public disclosure

• v1.0.0: Complete security review of all components
• Ongoing: Automated security scanning via CI/CD pipeline

No external security audits have been conducted yet. We welcome professional security audits from qualified firms.

1. Immediate Response: Critical issues are addressed immediately
2. Security Patches: Released as patch versions (e.g., 1.0.1)
3. Advance Notice: Registered users may receive advance notification
4. Public Disclosure: Full disclosure after patches are available

• GitHub Releases: Subscribe to release notifications
• Security Advisories: GitHub Security Advisory system
• Mailing List: [If available] Security-focused mailing list

• NIST Recommendations: Follows NIST cryptographic guidelines
• RFC Compliance: Adheres to relevant RFC standards
• Industry Best Practices: Implements recognized security patterns

• Static Analysis: Bandit security linter integration
• Dependency Scanning: Regular vulnerability scanning of dependencies
• Type Safety: Comprehensive type hints and mypy checking
• Test Coverage: >90% test coverage including security tests

Yes, version 1.0+ is designed for production use with proper security measures.

The library implements sound cryptographic principles, but consider a professional audit for high-stakes applications.

We follow responsible disclosure practices and will patch vulnerabilities promptly.

Stay current with the latest patch version for security updates.

The implementation follows established cryptographic principles, but it's a simplified version. For complex ZKP needs, consider specialized libraries.

Last Updated: 2024-01-01 Next Review: 2024-07-01