SRC-232

CCSDS 355.0-B-2, Space Data Link Security Protocol, Blue Book, Recommended Standard, July 2022, 74 pp.

Commissioned by CCSDS. Who paid for a study is recorded because it bears on how its conclusions should be read, not because it makes them wrong.

Published claims resting on this source

• CLM-0762 The civil space command-link security standard says exactly which parts of a message it protects and which it does not: it fully protects the command payload, only partly protects the message header, and leaves several control and status channels unprotected altogether.
• CLM-0763 The civil space link security standards deliberately do not say which encryption to use, do not describe how to build a real system, and leave the choice of algorithm to the mission; a companion document adds the key management, rekeying and replay protection needed to run the protocol.

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