Q2: MDES Consider a block cipher MDES ("mini" DES) which works exactly the same as LDES, except that the operation from (A; 2; B) to (M4; 2) is based on the following S-box. 123 000 001 010 011 100 101 110 111 JJ2 00 00 00 01 00 00 10 11 Now design a new program with modify the LDES algorithm to implement the MDES. Test your program with the key set and message as in part 1: for each key = 00, 01, 10, Show all I/O of running the programs. 0000), E1000), E0100), E0010), E0001), E1100), 1010), 1001), 40110), 0101), 20011), 20111), 1011), 1101), 1110), 1111). Discuss if the MDES still has the problem existing in LDES (refer to points e and f)