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A fixed-length value used as a message fingerprint is called a
Message value
Hash value
MAC
Digital signature
Since the hash is short, using the hash instead of the original input is much faster. Cryptographic hash functions take an input of arbitrary length and produces a message digest that is of a fixed, short length (e.g. 128 or 160 bits). The digest is sometimes also called the "hash" or "fingerprint" of the input. The Fixed-Length is the Hash Value.
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