The set of Key Material Identification Numbers (KMIDs) of all keys in a universal that have been reported compromised. Cryptographic devices will not establish a secure connection with equipment whose KMID is on the CKL.
Source(s):
CNSSI 4009-2015
from
CNSSI 4032
A list of named keys that are known or suspected of being compromised.
Source(s):
NIST SP 800-57 Part 2 Rev.1
under Compromised key list (CKL)