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.

NIST SP 800-21 E2

Guideline for Implementing Cryptography in the Federal Government

Date Published: December 2005

Supersedes: SP 800-21 (11/01/1999)


Elaine Barker (NIST), William Barker (NIST), Annabelle Lee (NIST)



cryptographic algorithm; cryptographic hash function; cryptographic key; cryptographic module; digital signature; key establishment; key management; message authentication code
Control Families

Contingency Planning; Incident Response; Planning; System and Services Acquisition; System and Communications Protection


Download URL

Supplemental Material:
None available

Document History:
12/01/05: SP 800-21 E2 (Final)