Your answer to each question should:
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Use Microsoft Word format
Question 1
Suppose you changed the protocol in Kaufman & Perlman §20.8.2 Plausible Deniability Based on Public Key Technology so Alice first signs S, and then encrypts with Bob’s public key. So, instead of sending [{S}Bob]Alice to Bob, she sends {[S]Alice}Bob. Written in the syntax of the textbook:
message M sent to Bob = (M, MAC<M, S>, {[ S ]Alice}Bob)
Does this work? (i.e., can Bob be sure that the message came from Alice, but not be able to prove it to a third party?) Your response needs to include a justification with citations.
Question 2
Consider the following format for Alice sending signed, encrypted email to Bob:
Alice invents a secret key S and sends {S}Bob, the message encrypted with S, and the message digest of the message signed by Alice. Is this secure? Your response needs to include a justification with citations. (Hint: Alice only signs the message digest. You may want to breakdown the information the question provides into the syntax of the textbook and compare the results with known methods.)
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