Skip to main content
U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.


Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

Secure Hash Standard (SHS)



Elaine B. Barker


[Superseded by FIPS 180-2(August 2002):] This standard specifies a Secure Hash Algorithm (SHA-1) which can be used to generate a condensed representation of a message called a message digest. The SHA-1 is required for use with the Digital Signature Algorithm (DSA) as specified in the Digital Signature Standard (DSS) and whenever a secure hash algorithm is required for federal applications. The SHA-1 is used by both the transmitter and intended receiver of a message in computing and verifying a digital signature. [Supersedes FIPS 180 (May 11, 1993):]
Federal Inf. Process. Stds. (NIST FIPS) - 180-1
Report Number


computer security, digital signatures, Federal Information Processing Standard, hash algorithm
Created April 17, 1995, Updated February 19, 2017