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Question:
(a) Explain how the Diffie-Hellman key establishment protocol works.
(b) Prove that the Diffie-Hellman key establishment protocol is vulnerable to a `man in the middle attack '.
(c) Alice and Bob uses the Diffie-Hellman protocol to communicate. In order to be certain that they are communicating with each other, they introduce authentication into the key establishment protocol by making use of the Key Exchange Algorithm. Explain how the Key Exchange Algorithm works.
Problem (1) - Alice, Bob and Charlie have a secret key a=3, b=4, c=5, respectively. - They want to find a common secret key using Diffie-Hellan key exchange protocol (with g
(a) Consider the subsequent authentication options: A. Using password. B. Using pin and fingerprint Which option A or B provides stronger security and why? (b) Give
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(a) Using the extended Euclidean algorithm, find the multiplicative inverse of 504 mod 67. (b) Decrypt the following ciphertext, which has been encrypted using Caesar cipher:
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