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A framework for publicly logging the existence of Transport Layer Security (TLS) certificates as they are issued or observed in a manner that allows anyone to audit CA activity and notice the issuance of suspect certificates as well as to audit the certificate logs themselves. (Experimental RFC 6962)
NIST SP 1800-16B under Certificate Transparency from RFC 6962
NIST SP 1800-16C under Certificate Transparency from RFC 6962