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What is Cryptographic Hash Function?

A cryptographic hash function is an algorithm that can be run on a piece of data, like an individualĀ fileĀ or a password, to produce a value called a checksum.

Unlike secret key and public key algorithms, hash functions, also called message digests, have no key. Instead, a fixed-length hash value is computed, based on the plaintext that makes it impossible for either the contents or length of the plaintext to be recovered.

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