[Solved] SIL765 Assignment 1

You are required to develop a program to encrypt (and similarly decrypt) a 128bit plaintext using AES that uses keys of size 128 bit, and 10 rounds. Instead of using an available library, I insist that you program any and every element of each of the 10 rounds of AES (and that means Substitute bytes, shiftrows, etc., generation of subkeys, etc.). Having done that, and for a one or more input plaintext(s), verify that indeed the output of the 1^st and 9^th encryption round is identical to the output of the corresponding decryption rounds. (This is illustrated below).

Project 1:

You are required to develop a program to encrypt (and similarly decrypt) a 64bit plaintext using DES. Instead of using an available library, I insist that you program any and every element of each of the 16 rounds of DES (and that means Fbox, 32bit exchanges, generation of subkey required in each round). Having done that, with one or more 64bit plaintext(s), verify that indeed the output of the J^th encryption round is identical to the output of the (16J)^th decryption round. (This is illustrated below for round 16 of encryption).