Message Flow Confidentiality <A NAME=x400mfc> </A>

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Message Flow Confidentiality  

Message flow confidentiality allows the message originator to conceal the flow of a message through the MHS, protecting against information that may be derived from its observation. This service counters the threats of traffic analysis and loss of anonymity of the communicating parties. It is provided by a technique called double enveloping.

To provide this service, the message originator specifies that the content of a message is itself a complete message (usually encrypted). The recipient on the outer envelope, upon receiving the message, forwards the message to the recipient named on the inner envelope. Double enveloping only provides a limited message flow confidentiality service. A more comprehensive service would include traffic padding and routing control, which are outside the scope of the X.400 Recommendations.

John Barkley
Fri Oct 7 16:17:21 EDT 1994