1- Perform just one round operation of the S-DES for the following 8-bit input.
Input à 10011101

Find the output which becomes the input for the next round using the following figure.

[Marks: 3]

Answer:

2- Alice and Bob agree on prime numbers p=113 and g=11. Alice choose a random secret number as 29 and Bob choose random secret number 17. Find the shared secret key to encrypt a message using Diffie Key exchange algorithm.

[Marks: 2]

Answer:

3- Alice chooses (3, 33) as private key and (7, 33) as public key. Bob sends the following ciphertext message to Alice using RSA algorithm.

1, 16, 30, 2, 7, 7, 20, 22, 13, 20, 12, 20, 18, 16

Find the plain text message received by Alice.

[Marks: 3]

Answer:

Sample Solution

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