Answer to Question #306717 in MatLAB for Anku

Question

Assume Bob sends an Elgamal encrypted message to Alice. Wrongly, Bob uses the same parameter i for all messages. Moreover, we know that each of Bob's cleartexts start with the number x₁ = 21 (Bob's ID). We now obtain the following ciphertexts

(KE,1 = 6,y₁ = 17), (KE.2 = 6, y2 = 25).

The Elgamal parameters are p = 31, α = 3, ß = 18. Determine the second plaintext

x2.

Answer 1

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