What is SHA-1?
SHA-1 (Secure Hash Algorithm) is a most commonly used from SHA series of cryptographic hash functions, designed by the National Security Agency of USA and published as their government standard.
SHA-1 produce the 160-bit hash value. Original SHA (or SHA-0) also produce 160-bit hash value, but SHA-0 has been withdrawn by the NSA shortly after publication and was superseded by the revised version commonly referred to as SHA-1. The other functions of SHA series produce 224-, 256-, 384- and 512-bit hash values.
History of SHA series.
SHA-0 published in 1993 as the Secure Hash Standard, FIPS PUB 180 by National Institute of Standards and Technology.
SHA-1 published in 1995 in FIPS PUB 180-1.
SHA-256, SHA-384 and SHA-512 first published in 2001 as draft FIPS PUB 180-2 and released as official standard in 2002.
SHA-224 published in 2004 as change notice for FIPS PUB 180-2.
About AccuHash 2.0
AccuHash 2.0 (the Windows utility for protecting the integrity and verifying the accuracy of data files) currently support SHA-1 (Secure Hash Algorithm) designed by the National Security Agency (NSA) in 1993 as the algorithm of the Secure Hash Standard (SHS, FIPS 180). checksums. Latest version of AccuHash is 2.0.18 - ah2setup.exe (968Kb) from Jun 11, 2006.