Question: c) Decrypt the ciphertext given below using the given formula and alphabet index: Ciphertext: pbby ph diwhy wkh wrjd Formula: p = d (3, c)

c) Decrypt the ciphertext given below using the given formula and

c) Decrypt the ciphertext given below using the given formula and alphabet index: Ciphertext: pbby ph diwhy wkh wrjd Formula: p = d (3, c) mod 26 e g h i gk 1 m n 0 1 2 3 4 5 6 7 8 9 10 11 12 13 op 9 r S t u V W X z 14 15 16 17 18 19 20 21 22 23 24 25 [10 marks] d) Describe Diffie-Hellman protocol for Bob and Alice who agreed on two values 5 and 7. Bob's random value is 3 and Alice's random value is 4. [15 marks]

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