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Hash Functions

What is hash function ?! Hash function maps a variable length message into a fixed length hash value. Cryptographic hash function is an algorithm for which no attack is more efficient than brute force to find 1- Get the message from the hash value. 2- Find two messages with the same hash value. Building a simple hash function The simplest form of hash function is bit-by-bit XOR but it is not secure at all h = B1 ⊕ B2 ⊕ B3 ….
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Secure Hashing Algorithm

Secure Hashing Algorithm (SHA) is based on the hash function MD4 ,SHA was developed by National Institute of Standards and Technology (NIST) and published in 1993 known as SHA-0, and then published SHA-1 in 1995 that produces a hash value of 160 bits, Then SHA-2 with a hash value length of 256,384 and 512 bits known as SHA-256 SHA-384 and SHA-512 respectively. SHA-512 SHA-512 takes as input a message with a maximum length less than \(2^{128}\) and produces 512 bits.
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