DES

This repository has an implementation of DES encryption.

Below is the description of the assignment.

DES program consists of several classes:

1. DES_Simultion

   • Main simulation engine

2. Conversion

   • Provides utility functions for conversion between a string of characters and a binary string
   • Not part of DES

3. DES

   • Includes encryption and decryption algorithms

4. IP

   • Initial permutation

5. FeisteNetwork

   • Consists of 16 rounds.
   • This class includes the f-function with four steps: Expansion, Xor, S-box substitution, Permutation

6. IPinverse

   • Final permutation, inverse of the initial permutation

7. KeySchedule

• Includes key scheduling algorithms for both encryption and decryption

7. To run the DES_Simulation class, provide two command line arguments for a file name for plaintext and another file name for the key To run, type “java DES_Simulation input.txt key.txt”

   With the given txt files, your program output must be:

ciphertext: 0011011101110111100110111110011011101010000011011001110011111000 Success recoverted Text: Hi World

8. .txt files are included:
   • The plaintext.txt file contains exactly 8 characters which fit in a block of 64 bits.
   • The key.txt file contains a key of 64 bits.
   • You may choose different plaintext and keys.