SHA-2 (Secure Hash Algorithm 2) is defined in RFC 4634 and FIPS 180 and added three additional hash functions in the SHA family.

SHA-2 is a Block Cipher based on the SHA.

SHA-2 is a set of Cryptographic Hash Functions designed by the United States National Security Agency (NSA). They are built using the Merkle-Damgard construction, from a one-way compression function itself built using the Davies–Meyer structure from a (classified) specialized Block Cipher.

SHA-2 includes significant changes from its predecessor, Secure Hash Algorithm (SHA-1).

SHA-2 family consists of six Hash Functions with Message-Digest (hash values) that are 224, 256, 384 or 512 bits:

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