Keccak-256 Security API
Version: 1.0.0
Last Updated: 2025-01-02
Security Classification: Cryptographic Hash Function
Author: MetaMUI Security Team
Overview
Keccak-256 is the original Keccak algorithm (before NIST modifications), used primarily in Ethereum and other blockchain systems.
- Algorithm Family: Keccak (SHA-3 predecessor)
- Security Level: 128-bit collision resistance
- Output Size: 256 bits (32 bytes)
- Sponge Rate: 1088 bits
- Compatibility: Ethereum standard
Security Warnings ⚠️
- Not SHA3-256: Different padding than standardized SHA3-256
- Blockchain Standard: Used in Ethereum, not NIST SHA-3
- Sponge Construction: Different security model than Merkle-Damgård
- Domain Separation: Ensure proper domain separation in multi-use scenarios
API Functions
Hashing
def keccak256(data: bytes) -> bytes:
"""Compute Keccak-256 hash (Ethereum-compatible)"""
Security Best Practices
- Use for Ethereum compatibility only
- Use SHA3-256 for new non-blockchain applications
- Ensure correct padding (Keccak vs SHA-3)
- Validate against Ethereum test vectors
Security Analysis
Threat Model: Keccak-256 Threat Model
The comprehensive threat analysis covers:
- Algorithm-specific attack vectors
- Implementation vulnerabilities
- Side-channel considerations
- Quantum resistance analysis (where applicable)
- Deployment recommendations
For complete security analysis and risk assessment, see the dedicated threat model documentation.