Sha256 checksum mac4/3/2023 Collision resistance means that it isn't feasible to create two files that have the same hash, and preimage resistance means that it isn't feasible to create a file with the same hash as a specific target file. What is a cryptographic hash?Ĭryptographic hashes provide additional properties over simple checksums (all cryptographic hashes can be used as checksums, but not all checksums are cryptographic hashes).Ĭryptographic hashes (that aren't broken or weak) provide collision and preimage resistance. Examples of checksums are CRCs, Adler-32, XOR (parity byte(s)). In general a checksum provides no guarantee that intentional modifications weren't made, and in many cases it is trivial to change the file while still having the same checksum. What is a checksum?Ī checksum simply verifies with a high degree of confidence that there was no corruption causing a copied file to differ from the original (for varying definitions of "high"). You mention checksums, PGP, and SHA in your question title, but these are all different things.
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