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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.
CNSSI 4009-2015 from CNSSI 4032
A list of named keys that are known or suspected of being compromised.
NIST SP 800-57 Part 2 Rev.1 under Compromised key list (CKL)