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(a) Using Fermat's theorem, find 3201 mod 11.
(b) Explain how the Diffie-Hellman key agreement protocol works and what its purpose and main properties are.
Consider a Diffie-Hellman scheme with a common prime q = 11 and a primitive root α = 2.
(i) If user A has public key YA = 9, what is A's private key XA?
(ii) If user B has public key YB = 3, what is the shared secret key K, shared with A?
(c) Briefly explain the Output Feedback (OFB) mode of operation stating its advantages, disadvantages and uses.
table for inverse z transform
(a) (i) If m = p·q·r where p, q, and r are prime numbers, what is Φ(m)? (ii) Therefore, Determine Φ(440). (b) Describe the following terms as used in cryptography: (i)
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