Key Revocation

A function in the lifecycle of keying material; a process whereby a notice is made available to affected entities that keying material should be removed from operational use prior to the end of the established cryptoperiod of that keying material. 

See NIST SP 800-57 Part 1 Rev. 4 for more information. 
 
A stage in the lifecycle of keying material; a process whereby a notice is made available to affected entities that keying material should be removed from operational use prior to the end of the established cryptoperiod of that keying material. 

See NIST SP 800-57 Part 2 for more information.