A key specification documents the data format, encryption algorithms, hashing algorithms, signature algorithms, physical media, and data constraints for keys required by a cryptographic device and/or application.
Source(s):
NIST SP 800-57 Part 2
[Superseded]
A specification of the data format, cryptographic algorithms, physical media, and data constraints for keys required by a cryptographic device, application or process.
Source(s):
NIST SP 800-57 Part 2 Rev.1