Option B, the sender's private key. It's like locking your door with your own key, not your neighbor's. Makes sense, right? Unless your neighbor is really good at lockpicking, then you might want to rethink that strategy.
I'm going with B. The sender's private key is the way to go. Unless you're a spy, then you might want to use the receiver's key... or maybe the session key? Ah, who knows, just pick B and get it over with!
Hmm, I think D is the right answer. The receiver's public key is used to verify the digital signature, right? It's like catching a fastball with your face, gotta use the right hand for that.
Roy
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