Secure Hash
Algorithm

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The Secure Hash Algorithm is 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), and may refer to:-

SHA-0: A retronym applied to
the original version of the 160-bit hash function published in 1993 under the
name "SHA". It was withdrawn shortly after publication due to an undisclosed
"significant flaw" and replaced by the slightly revised version SHA-1.

SHA-1:
A 160-bit hash function which resembles the earlier MD5 algorithm. This was
designed by the National Security Agency (NSA) to be part of the Digital
Signature Algorithm. Cryptographic weaknesses were discovered in SHA-1, and
the standard was no longer approved for most cryptographic uses after
2010.

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
standardized, known as SHA-224 and SHA-384. These were also designed by the
NSA.

SHA-3:
A hash function formerly called Keccak, chosen in 2012 after a public
competition among non-NSA designers. It supports the same hash lengths as
SHA-2, and its internal structure differs significantly from the rest of the
SHA family.

The corresponding standards are FIPS
PUB 180 (original SHA), FIPS PUB 180-1 (SHA-1), FIPS PUB 180-2 (SHA-1, SHA-256,
SHA-384, and SHA-512). NIST has said that FIPS 180-5 will include SHA-3.

This disambiguation
page lists articles associated with the same title.
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to the intended article.

Retrieved from "http://en.wikipedia.org/w/index.php?title=Secure_Hash_Algorithm&oldid=536510446"

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