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Version 4.5.22 — Advanced Cryptographic Core Update

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@SecureBitChat SecureBitChat released this 07 Nov 15:55
4.5.22
968fff9

Version 4.5.22 — Advanced Cryptographic Core Update

Enhanced HKDF-Based Key Derivation

Major cryptographic upgrade implementing a modern, RFC 5869-compliant HKDF derivation process, ensuring stronger isolation and future-proof session key security.

Key Improvements:

  • Implemented proper HKDF key derivation following RFC 5869
  • Added Perfect Forward Secrecy (PFS) for enhanced session confidentiality
  • Improved key separation via unique info parameters per derived key
  • Increased salt entropy from 32 → 64 bytes
  • Integrated ECDH + HKDF flow following Web Crypto API standards
  • Introduced metadata encryption key for sensitive data protection
  • Added structured error handling and validation logic
  • Backward compatible with previous secure sessions

Security Enhancements

This release significantly strengthens the cryptographic infrastructure of SecureBit Chat:

  • Cryptographic isolation between encryption, metadata, and handshake keys
  • Enhanced protection against cross-key and future key compromise
  • Improved compliance with OWASP cryptographic storage recommendations
  • Alignment with RFC 7748 and NIST SP 800-56A standards
  • Higher resistance to potential entropy degradation

Technical Details

  • Refactored deriveSharedKeys() with HKDF-compliant key schedule
  • Updated WebRTCManager to integrate the new messageKey API
  • Enhanced validation and fallback error handling
  • Standardized crypto operations across all supported browsers
  • Improved logging and debugging for cryptographic lifecycle tracking

Architecture Overview


CryptoCore:
  - HKDF (RFC 5869) compliant derivation
  - ECDH ephemeral key exchange
  - Unique salt & info separation
  - Metadata encryption key layer
  - Automatic key validation
  - Structured error isolation

Browser Compatibility

  • Chrome / Edge 90+ ✅
  • Firefox 88+ ✅
  • Safari 14+ ✅
  • Opera 75+ ✅

Why This Update Matters

Version 4.4.99 establishes a new level of cryptographic robustness. By integrating Perfect Forward Secrecy and HKDF key derivation, SecureBit Chat achieves modern, standard-compliant, and future-ready encryption security — without sacrificing backward compatibility.

[[🚀 Try SecureBit Chat](https://securebitchat.github.io/securebit-chat/)](https://securebitchat.github.io/securebit-chat/) • [[📖 Full Changelog](CHANGELOG.md)](CHANGELOG.md) • [[⭐ Star on GitHub](https://github.com/SecureBitChat/securebit-chat)](https://github.com/SecureBitChat/securebit-chat)
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