Algorithms
What is SLH-DSA?
Also known as SPHINCS+.
Stateless Hash-Based Digital Signature Algorithm. NIST's hash-based signature standard, finalised as FIPS 205 in August 2024. Twelve parameter sets across SHA2 / SHAKE hash families. Conservative security based solely on hash-function strength — used by QNSP on Government tier when lattice assumptions are not acceptable.
Deep dive
SLH-DSA on QNSP
NIST's hash-based digital signature standard, finalised August 2024 as FIPS 205. SLH-DSA's security rests only on the hardness of finding hash function preimages — the most conservative assumption available — making it the natural choice for long-archival signatures and government-tier policy.
For parameter sets, key and signature sizes, NIST ACVP conformance status, and when to use it, see the full SLH-DSA algorithm reference.
FAQ
Common questions
What is SLH-DSA?
Stateless Hash-Based Digital Signature Algorithm. NIST's hash-based signature standard, finalised as FIPS 205 in August 2024. Twelve parameter sets across SHA2 / SHAKE hash families. Conservative security based solely on hash-function strength — used by QNSP on Government tier when lattice assumptions are not acceptable.
What is SLH-DSA also known as?
SLH-DSA is also known as SPHINCS+. Stateless Hash-Based Digital Signature Algorithm. NIST's hash-based signature standard, finalised as FIPS 205 in August 2024. Twelve parameter sets across SHA2 / SHAKE hash families. Conservative security based solely on hash-function strength — used by QNSP on Government tier when lattice assumptions are not acceptable.
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