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A checksum is a small-sized datum derived from a block of digital data to detect errors which may have occurred in its transmission or storage.
The Non cryptographic hash functions only try to avoid collisions for non malicious input. Some aim to detect accidental changes in data.
A keyed cryptographic hash produces an output that depends both on the input data, and a key, and it is cryptographically secure.
The Unkeyed hash functions are, by its definition, hash functions processed without a key. The SHA-1 is an Unkeyed hash functions.
String encoders and decoders
In cryptography, a block cipher is a deterministic algorithm processing on fixed-length data string. Which called a block, with an unvarying transformation that is specified by a symmetric key.