Signature schemes built out of and based on properties of hash functions. **DO NOT USE THIS TAG** if the signature is based on other hard problems and just happen to employ a hash function.

Hash-based digital signatures, such as Lamport one-time signatures, are digital signature schemes based on a (non-trapdoor) one-way function such as a cryptographic hash function. Such schemes are expected to remain secure even against attacks using quantum computers.

See also: