Data integrity

 

A message can be digitally signed by a message exit at the sending end of a channel. The digital signature can then be checked by a message exit at the receiving end of a channel to detect whether the message has been deliberately modified.

Some protection can be provided by using a message digest instead of a digital signature. A message digest might be effective against casual or indiscriminate tampering, but it does not prevent the more informed individual from changing or replacing the message, and generating a completely new digest for it. This is particularly true if the algorithm that is used to generate the message digest is a well known one.

 

Parent topic:

Message exit

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