Hash Function
Fleeting External reference: https://en.wikipedia.org/wiki/Hash_function
Hash function  Wikipedia
Hash functions are related to (and often confused with) checksums, check digits, fingerprints, lossy compression, randomization functions, errorcorrecting codes, and ciphers.
Secure Hash Algorithms

External reference: https://en.wikipedia.org/wiki/Secure_Hash_Algorithms Secure Hash Algorithms  Wikipedia
The Secure Hash Algorithms are a family of cryptographic hash functions published by the National Institute of Standards and Technology (NIST) as a U.S. Federal Information Processing Standard (FIPS), including