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You have to implement encryption and decryption with Simplified DES, as discussed in the class and in Stallings 3rdedition. The permutations IP, P10, P8, and SW, and the functionsfk, F, and the S-box S0 are all as described, andcan be hardwired into your program. For parts (a) and (b), you will use the original S1 box as described in Stallings3rd edition.However, for part (c), you have to use a modified S-box S1.In the modified S1, the rows 2and 3 are the same as described for the original S1, but the rows 0 and 1 have been switched. So row 1 is 0,1,2,3 androw 0 is 2,0,1,3. Your program should:take as input a 8-bit block of plaintext and a 10-bit key.Show the following output (please only print what is being asked for, and nothing else):(a) the intermediate result after the SW operation while encypting.(b) the ciphertext.(c) the intermediate result after the SW operation while decrypting.(d) the result of the decryption process.You have to run your programs on the following inputs:(a) with the original S1: the example from the textbook i.e. the plaintext is 10111101 and the key is 1010000010.In this case we know the ciphertext should come out to be 01110101, so this is a good way to check that yourprogram is performing correctly on this input.(b) with the original S1: the plaintext is 01010111 and the key is 1011100110.(c) with the modified S1: the plaintext is 01110101 and the key is 1100110111.Please note that you do not have to actually implement these operations as bit operations. For example, you canstore the plaintext as an array of integers.If you find it easier, you can hard-wire the S-boxes (S0,S1,S1) in your program.