SLH-DSA-192 (FIPS 205 Level 3) Parameter Tier — Network Default
Parameter-tier sub-spec for SLH-DSA-192 (NIST FIPS 205 security level 3), the Lux network default hash-based signature. Algorithm definition deferred to LP-4500.
Implementation status (code-audited 2026-07-03): SHIPPED Parameters confirmed against luxfi/crypto/slhdsa (circl v1.6.3).
Abstract
SLH-DSA-192 is the NIST FIPS 205 security-level-3 parameter family
of the Stateless Hash-based Digital Signature Algorithm and the
Lux network default for hash-based signatures (precompile
address 0x012203 in LP-0120 uses SLH-DSA-192f). This LP pins the
tier identifier, covers both the "s" (small, ~16 KB sig) and "f"
(fast, ~35,664 B sig) sub-variants, and points at the algorithm
spec in LP-4500. Sizes: public key 48 B, secret key 96 B.
Verification time ~1.92 ms (131 µs cached). Use SLH-DSA-192 for
conservative defense-in-depth alongside ML-DSA-65 (LP-4420) on
long-lived signing keys, audit trails, and cert profiles requiring
hash-only security assumptions.
Reference implementation
- Primitive:
luxfi/crypto/slhdsa/slhdsa192 - Hash backend: SHA2-384 or SHAKE192
- Threshold wrapper (Magnetar): LP-4540
- Test vectors: NIST KAT vectors (FIPS 205 Appendix B)
Provenance
Originally LP-4420, renumbered 2026-05-18 to consolidate all cryptographic primitives into the 4xxx range with family sub-ranges (PQ hash signatures 4500-4599). The 4420 slot is retained as a permanent pointer to this LP.
Copyright
Copyright and related rights waived via CC0.