Lab 6 (05/04/2023)

Problems for lab session:

Practicals

Use the following plaintext for encryption in the following questions:

Plaintext: 2210ModernCrypto

Part-1:

1. Define a function strToBin() to perform the following operation:

   • Convert any string (of bytes or char.) to a binary string
   • Use the ASCII values for intermediate operation
   • Each char. MUST be converted to the 8-bit binary string

2. Define a function binToStr() to perform the following operation:

   • Convert any binary string to ASCII char. string
   • Each char. MUST be retrieved from the sets of 8-bit binary string

Part-2:

1. Implement the Feistel Cipher algorithm for data-encryption with the following properties:

   • The complete plaintext MUST be converted to a binary string before the operation
   • The entire plaintext should be split only in two halves viz left half (L1) and right half (R1)
   • The algorithm MUST use two random keys K1 and K2 generated using LinearCongruentialGenerator()
   • There MUST be exactly three rounds for encryption

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