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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Released in 2001, the stronger SHA-2 version superseded SHA-1.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 ?
A spokesman for the East Midlands SHA, now part of NHS Midlands and East, said: "The material makes it clear that it was NHS East Midlands, the strategic health authority (now part of NHS Midlands and East), which was concerned about patient safety at the trust.
The West Midlands Strategic Health Authority said many hospitals across the region already sent out text message reminders to help prevent the problem.
COUNTING DOWN TO GAMES North East Olympic ambassador Elaine Wilson from North East Strategic Health Authority at Newburn Riverside
Staff at the Strategic Health Authority began getting off their chairs and into action in June and now more than 60% are engaged in fitness activities.
The move will see strategic health authority chief Bill McCarthy take up a post in October charged with setting up the new NHS Commissioning Board based in Leeds, which will have overall charge of the health service.
Table 1 shows the proportion of patients seen within 18 weeks by Strategic Health Authority for admitted and non-admitted pathways.
The strategic health authority, which manages NHS finances, lent University Hospitals Coventry and Warwickshire NHS Trust pounds 27 million in 2006 for income and expenditure, to help trust bosses balance the books in the long term.
Speaking on behalf of the NHS organisations involved, Dr Paul Watson, medical director of the Essex Strategic Health Authority and chairman of the West Essex Breast Screening Incident team, said: "We very much regret that the breast screening service in West Essex was not meeting national quality standards for a time and that we needed to call women back for further assessment, which may have been extremely stressful.
It calls on council chief executive David Henshaw to tell Merseyside and Cheshire strategic health authority and primary care trusts that ``means other than the deliberate addition of pesticides to our drinking water'' should be used to improve dental care.
He had been chief executive of Avon, Gloucestershire and Wiltshire strategic health authority since January 2003.
This year not one strategic health authority has a large enough prescription budget to cope with demand.
The company's customers include Boeing, the United Nations, the National Library of Wales, Interfleet Technology, Deloitte Touche Tohmatsu, the World Trade Organization, Cheshire and Merseyside Strategic Health Authority, and nearly half of the UK's police forces.

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