Microsoft Word

Your answer to each question should:

• Not exceed one (1) page in length
• Use 12 pt Times Roman font
• Use left justification
• Use single line spacing with no more than 6pt line space

Your submitted paper should:

• Not include a title page
• Set margins: Left = 1”, right = 1”, top = 1” and bottom = 1”
• Include your name in the header and a page number in the footer
• Use an additional page for the bibliography, if needed
• Include citations at the sentence level

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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