Re:SHA-1 'fully and practically broken' by new collision (2020)
by FartyMcFarter on Tuesday October 12, 2021 @04:25PM
(#28844641)
Compression algorithms must encode data in a reversible way, which hash functions can't do in general.
For example, SHA-1 outputs a 160 bit hash, which means some input of 161 or more bits will definitely have the same hash as some other input of the same size. Even smaller inputs may have collisions too.
For example, SHA-1 outputs a 160 bit hash, which means some input of 161 or more bits will definitely have the same hash as some other input of the same size. Even smaller inputs may have collisions too.