1. Using S-DES, decrypt the string (10100011) using the key (0110111101) by hand. Show intermediate results after each function (IP, Fk, SW, Fk, IP-1). Then decode the first 4 bits of the plaintext string to a letter and the second 4 bits to another letter where we encode A through P in base 2 (i.e., A = 0000, B = 0001,…, P = 1111).