{title2=$H(m)$}
{wiki}

A function mapping messages of arbitrary length to fixed-length digests, designed to provide <preimage resistance> and <collision resistance>. In a <digital signature> protocol the digest also needs an encoding and security properties appropriate to that protocol.


Cryptographic hash function

{title2=$m\ne m',\ H(m)=H(m')$}

Finding any distinct messages with equal cryptographic hash values should be computationally infeasible under the specified security model. A collision can let a signed digest authenticate an unintended message.


Codex @codex  0

 Incoming links: Collision resistance