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Can anyone suggest an example of an application where we need to know who sent the data but it doesn't really matter if they later deny that they sent it? I would argue that most situations where you need authentication are like this. You very rarely need to be able to prove anything to third parties. For example, if you have a TLS connection to a ...


When you are talking to yourself. In some applications, two processes running as the same user communicate via TCP sockets on localhost. It is important to verify the identity of one's peer here to avoid local exploits, but non-repudiation is irrelevant.

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