Lab 3 (15/03/2023)

Problems for lab session:

Practicals

NOTE: You need to print all of the following 4 things for Part-1 (Q1) & Part-2

1. Plaintext or original message
2. Key/Shift Value
3. Ciphertext
4. Decrypted text

Part-1:

1. Define Vernam Cipher and apply as per the given instructions:

   • Encrypt the message: A cat is not a dog
   • Length of message = Length of key = 18
   • Unique Key: Your Roll Number + Cryptography

2. Define a function LinearCongruentialGenerator() to generate Pseudo-Random Numbers (PRNs) with the following properties:

   • Seed value (X0): Your Roll Number
   • Generate 3 random numbers using LinearCongruentialGenerator()

Part-2:

1. Define a Caesar Cipher for English alphabets (UPPER CASE only) and:

   • encrypt <YOUR FIRST NAME> using any desired key/shift value > 3
   • decrypt the generated ciphertext

* You are allowed to import the functions defined in previous lab sessions, too (if needed)

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