A hash algorithm with a key length of 160 bits that was developed by the NSA.
(Secure Hash Algorithm-1). Authentication algorithm that generates a 160-bit message digest using a 160-bit key. IPSec truncates the message digest to 96 bits.
A fairly fast, well regarded hash function with 160-bit digests that has been standardized by the National Institute of Standards and Technology (NIST).
Secure Hashing Algorithm. The algorithm operates on any input length less than 2 64 to produce a message digest. The SHA1 algorithm is input to DSA.