SHA-1

SHA-1 is a widely-used 160-bit cryptographic hash function.

Specifications

 * FIPS PUB 180-1
 * FIPS PUB 180-4

Software

 * OpenSSL
 * GNU coreutils → sha1sum

Links

 * Wikipedia article
 * Google Security Blog: Announcing the first SHA1 collision
 * https://shattered.it/