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Payload Security Header (PSH): the optional application protection mechanism Bundle Agent Region ? Region ? Source Application Node Destination Application Node The Payload Security Header is computed once at the source bundle agent, carried unchanged throughout the DTN, and checked at the destination bundle agent. It contains an encrypted hash of the entire bundle, minus the BAH and other mutable fields, such as the custodian and sender fields If the received hash does not match the hash calculated at the destination, the bundle is discarded. PSH Source vs. Sender Destination vs. Receiver |