Leighton-Micali Hash-Based Signatures
2019
This note describes a digital signature system based on cryptographic
hash functions, following the seminal work in this area of Lamport,
Diffie, Winternitz, and Merkle, as adapted by Leighton and Micali in
1995. It specifies a one-time signature scheme and a general signature
scheme. These systems provide asymmetric authentication without using
large integer mathematics and can achieve a high security level. They
are suitable for compact implementations, are relatively simple to
implement, and naturally resist side-channel attacks. Unlike most
other signature systems, hash-based signatures would still be secure
even if it proves feasible for an attacker to build a quantum
computer. This document is a product of the Crypto Forum Research
Group (CFRG) in the IRTF.
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