The sha1 secure hash algorithm produces a digest of 160 bits. This provides 80 bits of security against collisions given the birthday attack (ref). An update document from NIST [L1 ] specifies a new family of secure hashing algorithms with longer digest lengths, specifically SHA-256, SHA-384, and SHA-512. An additional update also specifies SHA-224.
See also sha1, md4, md5, ripemd, cryptkit
[ Category Package, subset Tcllib | Category Cryptography ]