SHA


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SHA

SHA

(Secure Hash Algorithm) A family of popular cryptographic hash algorithms used to create digital signatures. The 160-bit SHA was developed by the National Institute of Standards & Technology (NIST) in 1993, and SHA-1 was the first revision in 1994. SHA-1 is similar to the MD4 and MD5 algorithms developed by Rivest, but is slightly slower and more secure. See MD5.

SHA-2 and SHA-3
Released in 2001, the stronger SHA-2 version superseded SHA-1. Because computers are increasingly more powerful, the stronger algorithm is encouraged by certificate authorities (CAs) to prevent an attacker from impersonating a CA. SHA-256 and SHA-512 are SHA-2 algorithms using hash lengths of 256 and 512 bits respectively, and SHA-224 and SHA-384 are truncated versions.

SHA-3 was released by NIST in 2015, which supports the same hash lengths as SHA-2 but uses a different cryptographic method based on the Keccak algorithm. SHA-3 was the result of a NIST competition for a new hash standard that began in 2006 and ended in 2012. See cryptographic hash function and digital signature.
References in periodicals archive ?
There is an emerging need for a guidebook that focuses on both the current available emergency procedures and also on how a SHA should react to and recover from a regional emergency.
The 93 suites in Sha are not about four walls, fluffy duvets, sheer curtains and a fancy coffee machine.
Sha Tin's card also hosted the Hong Kong Classic Cup, which produced a major shock result as 125-1 shot It Has To Be You beat 127-1 chance President Lincoln.
I would also like to put my thanks on record to Mark Ogden, Kevin Orford and David Stout, who have all done an outstanding job as interim SHA chief executives.
Sha says everyone in his college knew the couple was dating.
The crowd sang along on the refrain ("Let's go to the hop, oh baby, let's go to the hop") as Sha Na Na sang about the pleasures of doing 1950s dances like The Bop and The Stroll.
The opening of Hyatt Regency Hong Kong, Sha Tin willfurther strengthen our brand portfolio in Hong Kong," said Larry Tchou, managing director,Hyatt Hotels & Resorts - Asia Pacific.
This situation pervades the selected "scientific evidence" upon which the SHA has chosen to base their decision.
Okulihonga shihapu kombinga yomaufemba etu opamilele ongo ovakainhu osho sha li sha tulwa monomola yotete kuvahapu, ofimbo vamwe va li va teelela okutukulilafana omadiladilo nomauyelele novakainhu vakwao ovo va dja koitukulwa yoshilongo ya yoolokafana.
Trust bosses faced axing up to 200 jobs, but NHS West Midlands strategic health authority has worked out a funding package after the Department of Health and the SHA asked KPMG to assess the trust's financial needs to break even.
Toward that goal, the Maryland SHA recently volunteered to apply an environmental stewardship approach to a transportation improvement project by implementing the following key actions:
The event will feature a judging of classic cars, musical performers such as Sha Na Na and the Kingsmen, booths and displays featuring fire engines, police cars and children's games.