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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:
SHA-2 (Secure Hash Algorithm 2) is a set of cryptographic hash functions designed by the United States National Security Agency (NSA) and first published in 2001. [3] [4] They are built using the Merkle–Damgård construction, from a one-way compression function itself built using the Davies–Meyer structure from a specialized block cipher.
Whirlpool is a Miyaguchi-Preneel construction based on a substantially modified Advanced Encryption Standard (AES). Whirlpool takes a message of any length less than 2 256 bits and returns a 512-bit message digest. [3] The authors have declared that "WHIRLPOOL is not (and will never be) patented. It may be used free of charge for any purpose." [2]
BLAKE was submitted to the NIST hash function competition by Jean-Philippe Aumasson, Luca Henzen, Willi Meier, and Raphael C.-W. Phan. In 2008, there were 51 entries. BLAKE made it to the final round consisting of five candidates but lost to Keccak in 2012, which was selected for the SHA-3 algorithm.
Encrypt xmm using 256-bit AES key indicated by handle at m512 and store result in xmm. [c] AESDEC256KL xmm,m512: F3 0F 38 DF /r: Decrypt xmm using 256-bit AES key indicated by handle at m512 and store result in xmm. [c] AESKLE+WIDE_KL AES Wide Key Locker instructions. Perform encryption or decryption for eight 128-bit AES blocks at once ...
Encryption scrambles and unscrambles your data to keep it protected. • A public key scrambles the data. • A private key unscrambles the data. Credit card security. When you make a purchase on AOL, we'll only finish the transaction if your browser supports SSL.
The following tables compare general and technical information for a number of cryptographic hash functions. See the individual functions' articles for further information.
The methods resemble the block cipher modes of operation usually used for encryption. Many well-known hash functions, including MD4 , MD5 , SHA-1 and SHA-2 , are built from block-cipher-like components designed for the purpose, with feedback to ensure that the resulting function is not invertible.