Technical dictionary
Hash-based signature
Signatures built from hash functions (e.g. XMSS, LMS, SPHINCS+/SLH-DSA)—conservative PQ option.
Definition
Hash-based signatures rely on hash function properties rather than factoring or discrete logs. Some are stateful (XMSS/LMS); SLH-DSA is stateless.
They often have larger signatures but strong confidence assumptions relative to newer lattices for some risk appetites.