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Talk about the properties of each of the following protocols, such as perfect forward secrecy, escrow foilage against passive attacks, escrow foilage against active attacks, identity hiding, perfect forward secrecy for identity hiding. Assume private encryption keys are escrowed and private signature keys are not escrowed.

• Protocol 14-2.

• A modified form of Protocol 14-2 in which the first two messages are encrypted with the other end’s public key rather than signed by the transmitter’s private signature key. So in message 1 Alice sends {“Alice”, ga mod p} encrypted with Bob’s public key, and Bob in message 2 sends {“Bob”, gb mod p} encrypted with Alice’s public key.

• Protocol 14-4.

• Protocol 14-9, where Alice and Bob share a secret key S.

• Each side sends a nonce encrypted with other’s public encryption key, resulting key is ⊕ of two nonces

• Assume Alice and Bob share a secret S. Design a protocol in which they can do mutual authentication and establish a shared secret with PFS. Can it be done without DiffieHellman or any other form of public key cryptography?

• Protocol 14-2, but with each side deterministically generating the Diffie-Hellman private numbers as described in §14.4 PFS-Foilage from a seed given to the client machine and escrowed at the server machine.


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