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SHA-1 (Secure Hash Algorithm) is a cryptographic hash function that was first published in 1995 in Federal Information Processing Standards (FIPS) PUB 180-1 by the National Security Agency (NSA) as a fix to an unknown flaw found in SHA-0.

In February of 2005 an attack was announced that could find collisions in SHA-1 requiring fewer than 269 operations.


On most Unix systems the tool sha1sum can be used to compute the SHA-1 hash of a file or devices.

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