SLH-DSA-SHAKE-256f Security API
Side-channel claim limit. Nothing on this page claims constant-time behaviour or side-channel resistance for any target: the side-channel harness covers nothing (finding A48) and no measurement exists. The Rust and C cores are designed for constant time and unmeasured; managed runtimes (JIT, GC, bounds checks) make no timing claim. Where this page names constant-time or side-channel techniques, in prose or in code, they are design intent or recommendations, not measured properties.
Version: 1.0.0
Last Updated: 2025-01-02
Security Classification: Stateless Hash-Based Signature
Author: MetaMUI Security Team
Overview
SLH-DSA-SHAKE-256f uses SHAKE256 for enhanced security, providing 256-bit security level with stateless operation.
- Algorithm Family: Hash-based signature
- NIST Security Level: Level 5 (256-bit security)
- Key Sizes:
- Public Key: 64 bytes
- Secret Key: 128 bytes
- Signature: 29792 bytes (fast variant)
- Standard: FIPS 205
Security Warnings ⚠️
- Very Large Signatures: 29792 bytes per signature
- Maximum Security: 256-bit post-quantum security
- SHAKE256-based: Uses Keccak sponge construction
- Bandwidth Consideration: Not suitable for constrained networks
API Functions
Similar to SLH-DSA-SHA2-128f with SHAKE256 and level 5 parameters.
Security Analysis
Threat Model: SLH-DSA-SHAKE-256f 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.