FPT_SSP.2 Mutual trusted acknowledgement
User application notes
In this component, in addition to the TSF being able to provide an acknowledgement for the receipt of a data transmission, the TSF must comply with a request from another part of the TSF for an acknowledgement to the acknowledgement.
For example, the local TSF transmits some data to a remote part of the TSF. The remote part of the TSF acknowledges the successful receipt of the data and requests that the sending TSF confirm that it receives the acknowledgement. This mechanism provides additional confidence that both parts of the TSF involved in the data transmission know that the transmission completed successfully.