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DTIC ADA404837: Communications and Information. Communications Security: Protected Distribution Systems (PDS)

Air Force Instruction (AFI) 33-201, (FOUO) Communications Security (COMSEC), requires the use of National Security Agency (NSA)-endorsed communications security (COMSEC) products and services to secure classified telecommunications by all Air Force activities and their contractors. Information systems or networks that process classified national security information in more than one controlled access area (CAA) and require the transfer of that information between CAAs, must use a secure means of transference--secure telecommunications or courier. If secure telecommunications is chosen, include a secure telecommunications requirement (COMSEC) in the systems security policy. In order of preference, the COMSEC requirement is met by: NSA-endorsed COMSEC systems (encryption), NSA-endorsed intrusion detection optical communications system (IDOCS), or a protected distribution system (PDS). AFI 33-201 also requires the use of NSA-endorsed COMSEC products, techniques, and protected services to protect certain unclassified, sensitive telecommunications involving Air Force activities and their contractors. When certain unclassified, sensitive information must be protected, and a PDS is chosen

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