We provide security updates for the following versions:

We take the security of our SLIP-0039 implementation seriously. If you discover a security vulnerability, please report it responsibly.

Please do NOT create a public GitHub issue for security vulnerabilities.

Instead, please report security issues by:

1. Email: Send details to slip39_security@supere.simplelogin.com
2. Private disclosure: Use GitHub's private vulnerability reporting feature
3. Encrypted communication: Use our PGP key if available

When reporting a security vulnerability, please include:

• Description: Clear description of the vulnerability
• Impact: Potential security impact and affected components
• Reproduction: Step-by-step instructions to reproduce the issue
• Environment: .NET version, operating system, and other relevant details
• Proof of Concept: Code or examples demonstrating the vulnerability (if applicable)

We aim to respond to security reports according to the following timeline:

• Initial Response: Within 48 hours
• Confirmation: Within 7 days
• Fix Development: Within 30 days (depending on complexity)
• Release: As soon as possible after fix is ready

1. Assessment: We evaluate the reported vulnerability
2. Confirmation: We confirm the issue and determine impact
3. Fix Development: We develop and test a security fix
4. Coordinated Disclosure: We work with the reporter on disclosure timing
5. Release: We release a security update
6. Advisory: We publish a security advisory with details

This project implements SLIP-0039 Shamir's Secret Sharing, which involves handling sensitive cryptographic material. Key security aspects:

• ✅ Specification Compliance: Implement SLIP-0039 exactly as specified
• ✅ Standard Libraries: Use proven .NET cryptographic libraries
• ✅ Input Validation: Rigorous validation of all inputs
• ✅ Memory Safety: Secure handling of sensitive data
• ✅ Test Vector Compliance: Pass all official test vectors

• ❌ Custom Crypto: No custom cryptographic primitives
• ❌ Key Storage: We don't store or manage private keys
• ❌ Network Communication: No network operations
• ❌ Side-Channel Protection: Basic implementation (not hardened against timing attacks)

When using this library:

// ✅ Good: Clear sensitive data
var secret = Encoding.UTF8.GetBytes(sensitiveData);
try 
{
    var shares = Slip39ShareGeneration.GenerateShares(secret, 2, 3);
    // Use shares...
}
finally 
{
    Array.Clear(secret, 0, secret.Length); // Clear sensitive data
}

// ❌ Bad: Leaving secrets in memory
var shares = Slip39ShareGeneration.GenerateShares(
    Encoding.UTF8.GetBytes(sensitiveData), 2, 3);

• Secure Storage: Store mnemonic shares securely and separately
• Backup Strategy: Have a proper backup strategy for your shares
• Threshold Security: Understand that you need the threshold number of shares
• Passphrase Security: Use strong, memorable passphrases when applicable
• Environment Security: Use the tool in a secure environment

• Side-Channel Attacks: Not hardened against timing or power analysis attacks
• Memory Dumps: Sensitive data may persist in memory dumps
• Multi-Threading: Not designed for concurrent access to sensitive operations
• Platform Security: Relies on underlying platform security

• ✅ Development and Testing: Safe for development and testing
• ✅ Educational Purposes: Good for learning SLIP-0039
• ✅ Non-Critical Applications: Suitable for non-critical secret sharing
• ⚠️ Production Use: Review security requirements carefully
• ❌ High-Security Environments: May not meet stringent security requirements

• Implementation Bugs: Errors in cryptographic implementation
• Input Validation: Improper handling of malicious inputs
• Memory Safety: Sensitive data handling issues
• API Misuse: Insecure usage patterns

• Physical Attacks: Hardware-based attacks on the device
• Social Engineering: Attacks targeting users directly
• Operating System: Vulnerabilities in the underlying OS
• Network Security: Network-based attacks (not applicable)

• ✅ Code Review: Internal code review completed
• ✅ Test Vector Validation: All official test vectors pass
• ✅ Static Analysis: Basic static analysis performed
• ❌ External Audit: No external security audit performed
• ❌ Formal Verification: No formal verification performed

• Consider external security audit for future versions
• Implement additional security hardening measures
• Add more comprehensive security testing

We believe in responsible disclosure and will:

• Acknowledge: Acknowledge valid security reports promptly
• Communicate: Keep reporters informed of progress
• Credit: Provide appropriate credit for valid reports (if desired)
• Timeline: Work towards reasonable disclosure timelines
• Coordination: Coordinate with reporters on public disclosure

• SLIP-0039 Specification
• .NET Cryptography Guidelines
• Secure Coding Practices

• Uses .NET built-in cryptographic libraries
• Follows Microsoft's cryptographic guidelines
• Implements industry-standard algorithms

For security-related questions or concerns:

• General Questions: Create a GitHub discussion
• Security Reports: Use the private reporting methods described above
• Project Maintainers: Contact through GitHub

Important: This security policy applies specifically to the SLIP-0039 .NET implementation. Users are responsible for securing their own applications and environments when using this library.