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 Traffic-flow security - Definition 

Traffic-flow security is the use of measures that conceal the presence and properties of valid messages on a network to prevent traffic analysis. This can be done by operational proceedures or by the protection resulting from features inherent in some cryptographic equipment. Techniques used include:

  • changing radio callsigns frequently
  • encryption of a message's sending and receiving addresses (codress messages)
  • causing the circuit to appear busy at all times or much of the time by sending dummy traffic
  • sending a continuous encrypted signal, whether or not traffic is being transmitted.

Traffic-flow security is one aspect of communications security.

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