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SHA-2: A family of two similar hash functions, with different block sizes, known as SHA-256 and SHA-512. They differ in the word size; SHA-256 uses 32-bit words where SHA-512 uses 64-bit words. There are also truncated versions of each standard, known as SHA-224, SHA-384, SHA-512/224 and SHA-512/256. These were also designed by the NSA.
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.
The following tables compare general and technical information for a number of cryptographic hash functions. See the individual functions' articles for further information.
TLS 1.0 (deprecated) TLS 1.1 (deprecated) TLS 1.2 TLS 1.3 EV [n 3] [1] SHA-2 [2] ECDSA [3] BEAST [n 4] CRIME [n 5] POODLE (SSLv3) [n 6] RC4 [n 7] FREAK [4] [5] Logjam Google Chrome (Chrome for Android) [n 8] [n 9] 1–9 Windows (10+) macOS (11+) Linux Android (8.0+) iOS (16+) ChromeOS: Disabled by default Yes Yes No No No Yes (only desktop ...
SHA-2 available in 224, 256, 384, and 512-bit variants; HMAC keyed hash; PBKDF2 Key derivation function (RFC 2898) Digital signature standards.
SHA-2 basically consists of two hash algorithms: SHA-256 and SHA-512. SHA-224 is a variant of SHA-256 with different starting values and truncated output. SHA-384 and the lesser-known SHA-512/224 and SHA-512/256 are all variants of SHA-512. SHA-512 is more secure than SHA-256 and is commonly faster than SHA-256 on 64-bit machines such as AMD64.
SHA-2 SHA-3 RIPEMD-160 Tiger Whirlpool BLAKE2 GOST R 34.11-94 [45] (aka GOST 34.311-95) GOST R 34.11-2012 (Stribog) [46] SM3; Botan: Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Bouncy Castle: Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes BSAFE Crypto-J Yes Yes Yes Yes Yes No No No No No No cryptlib: Yes Yes Yes Yes Yes No Yes No No No No Crypto++ ...
Even if a given hash function becomes insecure, it is sufficient to replace it by a different, secure one to obtain a secure instantiation of the hash-based signature scheme under consideration. Some hash-based signature schemes (such as XMSS with pseudorandom key generation) are forward secure, meaning that previous signatures remain valid if ...