zlib does not use crc at all (zip does, but zlib doesn't). It uses adler-32 which shares most properties with crc32 (prob of missing a random error is almost th

zlib does not use crc at all (zip does, but zlib doesn't). It uses adler-32 which shares most properties with crc32 (prob of missing a random error is almost the same, error patterns are easy to analyze and are 16-bit additive and independent of data).