Instruction for National Security Systems Public Key Infrastructure X.509 Certificate Policy Under CNSS Policy No.25 [Version 1.1] [open pdf - 616KB]
"The Committee on National Security Systems Instruction (CNSSI) No. 1300, 'Instruction for National Security Systems (NSS) Public Key Infrastructure (PKI) X.509 Certificate Policy, Under CNSS Policy No. 25,' provides a secure, interoperable electronic environment that closes the gap between the classified Federal PKI, managed by the Federal PKI Policy Authority, and the highly classified Intelligence Community PKI, managed by the Office of the Director for National Intelligence (ODNI)."
CNSS Instruction No. 1300
Committee on National Security Systems: http://www.cnss.gov