Perform just one round operation of the S-DES for the following 8-bit input. Input 10011101 Find the output which becomes the input for the next round using the following figure.
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cryptography
Requirements: 3pgs
Semester 2 ? 2022/2023
Question 1: [Marks: 20]
Perform just one round operation of the S-DES for the following 8-bit input.
Input 10011101
Find the output which becomes the input for the next round using the following figure.
Solutions:
Question 2: [Mark: 15]
Alice and Bob agree on prime numbers p=113 and g=11. Alice chooses 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.
Solutions:
Question 3: [Mark: 15]
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.
Solutions:
Private key of Alice (3, 33)
Plain text message: ??
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