Implementation of the Data Encryption Standard (DES) Algorithm as an Assigent of the Subject Fundamental Concepts of Criptography 220 from Curtin University, Semester 1 2014.

• The input of plaintext for your code is required to be any text file instead of its direct binary representation.
• The key for encryption and decryption is required to be any combination of characters and symbols with any length.
• You are required to implement key generation, switch function and K function first and then combine all of these operations to achieve DES.
• After finishing your programming, and make sure it works properly. Then you can change the Sbox by your self and check whether your code still works.