Hash functions
Hash functions are mainly used in cryptography to check the integrity of messages, digital signatures, manipulation detection, fingerprints, and password storage. A function is a good hash function if the input string cannot be guessed based on the output. As hash functions convert random amounts of data to fixed-length strings, there may be some inputs that hash into the same string. Hash functions are created in such a way as to make these collisions extremely difficult to find. The most used hash functions are as follows:
MD2, MD4, and MD5 have 128-bits length and are not secure. SHA-1 has 160-bits length, but it is also not secure. ...
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