Question: QUESTION 1 (a) A block cipher of length 64 bits is used as a hashing function. (i) Sketch the block diagram for the hashing function

QUESTION 1

(a) A block cipher of length 64 bits is used as a hashing function.

(i) Sketch the block diagram for the hashing function if the message length is 512 bits.

(ii) Explain how to use the hashing function described as a cipher and what is the advantage?

b) The parameters for an El-Gamal signature are as follows: Primitive element a=7,and prime number q =13.

  1. For a number between 3 to 11, calculate a suitable public key that can be assigned to the users.
  2. To encrypt a message m=8, a random seed r=5 is generated. Calculate the generator function is sent together with the cipher text.
  3. The RSA public key cipher can be used to generate a digital signature. Is this applicable to the El-Gamal public key cipher?

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