Only need help with TASK 2 here. Providing the text from task 1, as its information might be relevant to task 2. 1. Study G-Schreiber cipher design. Describe known plain-text attack against its internal settings: 1)0-1 distribution on the wheels, 2) wheels initial state, 3) cabling permutation. The analysis is based on two observations: if the cipher-text 5-bit group is 11111 or 00000 at some moment, then the 5-bit group at the switches input is 11111 or 00000 respectively as well. So one can reconstruct the first 5 bits on the plug for those moments. Therefore the cabling to the first 5 plug positions and 0-1 distribution on related wheels are easily reconstructed by testing periodicity: the period of the bit sequence from a wheel with n =47,53,..,73 positions is n. You know switches input/ output at almost any moment now. Learn about control 5-bit group if switches input/ output comprise single 1 or single 0, that is of weight 1 or 4. Reconstruct the rest of the cabling and 0-1 distribution on related wheels . Remark the bits representing plain-text/cipher-text characters are numbered from left to right. So, for instance, the left most bit of a 5-bit group representing a plain-text character is XORed with the left most bit on the plug. The bottom bit of the output (see the picture) is the left most bit of a 5-bit combination representing the cipher-text character. Also have a look at the Maple implementation provided. TASK 2. For the plain-text, Latin alphabet 60 times, 1560 characters, a related cipher-text for the first 1560-10=1550 characters is given below. The plain-text was encoded by teleprinter code CCITT2 in Letter Shift, provided in the Lecture Notes and then got encrypted. Cipher-text 5-bit groups are encoded by their positions in CCITT2 code, e.g., 11000 is encoded by 1, 10011 is encoded by 2 and so on. Exemplary program for encryption with G-Schreiber including the code is provided. Find all internal settings of the cipher. Give a short description of the attack, comment the stages. Besides, continue encryption and provide the cipher-text(10 numbers) for the rest of the plaintext(10 characters). Plain-text = ABCDEGHIJKLMNOPQRSTUVWXY ABCDEFGHIJKLMNOPQRSTUVWXYZ Cipher-text = [5, 22, 29, 31, 9, 5, 13, 10, 24, 17, 18, 26, 25, 18, 29, 18, 16, 19, 17, 27, 28, 26, 17, 6, 2, 22, 12, 4, 8, 23, 8, 5, 17, 12, 19, 7, 32, 26, 11, 1, 10, 27, 26, 26, 29, 7, 24, 14, 2, 31, 30, 9, 13, 11, 8, 16, 11, 28, 14, 14, 10, 21, 31, 26, 27, 2, 30, 14, 17, 23, 2, 12, 24, 28, 16, 14, 32, 22, 23, 23, 19, 22, 24, 1, 18, 30, 13, 27, 23, 22, 6, 5, 6, 6, 16, 25, 9, 7, 23, 30, 27, 2, 23, 9, 15, 5, 12, 18, 1, 25, 15, 13, 4, 15, 19, 23, 13, 13, 10, 8, 20, 7, 8, 28, 23, 2, 1, 26, 5, 29, 19, 5, 13, 14, 17, 32, 29, 5, 22, 21, 14, 9, 30, 12, 9, 18, 22, 19, 2, 13, 18, 9, 22, 32, 10, 3, 4, 17, 9, 22, 14, 23, 7, 12, 25, 24, 31, 24, 5, 17, 9, 15, 31, 2, 2, 3, 7, 7, 28, 30, 22, 3, 21, 8, 17, 30, 15, 29, 32, 15, 20, 9, 14, 32, 10, 28, 1, 14, 1, 14, 7, 7, 29, 17, 8, 2, 32, 29, 22, 20, 31, 31, 8, 3, 14, 30, 7, 8, 24, 7, 4, 22, 17, 10, 20, 9, 21, 11, 29, 6, 5, 20, 22, 20, 23, 9, 3, 11, 10, 2, 15, 20, 23, 22, 15, 12, 10, 11, 16, 13, 19, 21, 17, 13, 7, 26, 7, 21, 4, 19, 19, 2, 21, 19, 20, 19, 18, 21, 24, 11, 21, 7, 3, 15, 1, 10, 16, 16, 21, 13, 7, 17, 5, 21, 6, 27, 27, 7, 4, 6, 13, 29, 4, 14, 8, 24, 31, 1, 32, 30, 15, 14, 28, 20, 6, 4, 19, 14, 22, 25, 30, 13, 2, 8, 20, 22, 23, 9, 9, 21, 1, 5, 27, 22, 23, 15, 11, 18, 21, 10, 25, 15, 6, 32, 9, 14, 3, 14, 25, 30, 3, 9, 4, 22, 1, 2, 32, 27, 17, 30, 14, 9, 30, 25, 16, 27, 16, 2, 7, 11, 4, 21, 7, 8, 7, 2, 16, 2, 31, 19, 27, 8, 23, 7, 19, 17, 12, 17, 26, 19, 5, 7, 25, 4, 29, 6, 18, 10, 8, 21, 23, 21, 17, 5, 29, 32, 6, 21, 7, 1, 24, 20, 11, 7, 10, 24, 6, 12, 10, 32, 16, 26, 22, 12, 17, 4, 8, 11, 28, 23, 11, 2, 25, 21, 2, 26, 17, 10, 24, 3, 28, 28, 9, 19, 10, 24, 2, 5, 13, 11, 25, 31, 25, 21, 5, 12, 17, 30, 5, 16, 1, 21, 31, 14, 5, 6, 21, 14, 13, 29, 11, 21, 21, 4, 32, 20, 20, 23, 14, 1, 22, 5, 26, 11, 11, 30, 11, 1, 24, 13, 4, 25, 6, 4, 18, 32, 18, 21, 16, 7, 28, 26, 25, 18, 10, 31, 24, 12, 9, 6, 8, 6, 28, 7, 27, 7, 31, 21, 29, 9, 2, 7, 29, 11, 7, 26, 25, 2, 20, 7, 27, 4, 18, 6, 22, 8, 16, 26, 9, 17, 21, 28, 3, 20, 16, 18, 7, 10, 13, 3, 2, 30, 26, 14, 3, 8, 25, 6, 25, 15, 7, 22, 20, 32, 4, 29, 27, 15, 27, 24, 20, 20, 15, 22, 10, 13, 29, 18, 19, 3, 29, 19, 12, 6, 12, 16, 4, 1, 18, 8, 12, 31, 28, 32, 15, 31, 24, 4, 11, 7, 6, 16, 26, 28, 18, 14, 32, 2, 2, 7, 6, 18, 3, 11, 22, 6, 14, 31, 17, 20, 4, 7, 7, 3, 27, 20, 28, 24, 3, 15, 28, 4, 3, 23, 4, 7, 28, 20, 13, 10, 6, 14, 23, 22, 9, 16, 1, 7, 19, 8, 15, 26, 3, 20, 20, 26, 12, 24, 14, 24, 31, 3, 16, 14, 25, 28, 5, 28, 22, 28, 4, 20, 6, 5, 10, 28, 10, 16, 29, 2, 5, 29, 22, 24, 24, 14, 12, 18, 19, 6, 8, 17, 5, 13, 2, 15, 6, 29, 1, 2, 5, 4, 10, 20, 1, 24, 16, 19, 2, 24, 13, 2, 25, 29, 5, 22, 1, 3, 20, 6, 6, 10, 2, 20, 29, 1, 6, 7, 24, 11, 31, 30, 1, 9, 14, 1, 28, 20, 30, 23, 16, 6, 31, 7, 22, 23, 32, 31, 30, 7, 9, 31, 23, 8, 7, 5, 26, 25, 22, 20, 7, 21, 23, 19, 22, 21, 11, 1, 6, 12, 28, 25, 30, 10, 13, 21, 16, 7, 10, 19, 27, 28, 21, 12, 25, 7, 30, 25, 8, 9, 26, 21, 1, 16, 17, 15, 13, 20, 16, 10, 20, 27, 7, 17, 15, 12, 2, 24, 24, 16, 2, 6, 30, 17, 29, 14, 6, 11, 31, 10, 14, 26, 10, 9, 31, 28, 7, 29, 19, 3, 3, 9, 16, 3, 11, 28, 17, 15, 12, 12, 1, 32, 24, 13, 17, 20, 26, 19, 27, 16, 18, 32, 8, 16, 13, 31, 30, 5, 4, 7, 11, 22, 21, 26, 9, 3, 1, 29, 25, 4, 13, 27, 24, 9, 6, 30, 4, 1, 25, 12, 19, 14, 19, 17, 19, 32, 25, 21, 16, 6, 3, 11, 30, 3, 22, 3, 22, 25, 27, 29, 1, 28, 20, 1, 8, 1, 21, 29, 31, 17, 12, 24, 7, 18, 2, 4, 4, 6, 14, 22, 27, 9, 3, 9, 13, 22, 30, 31, 26, 16, 3, 9, 16, 12, 24, 7, 29, 32, 8, 19, 8, 21, 29, 5, 26, 4, 31, 11, 13, 15, 12, 4, 12, 25, 20, 19, 19, 3, 31, 16, 6, 21, 27, 10, 22, 32, 20, 4, 31, 1, 24, 8, 30, 21, 4, 2, 5, 17, 28, 7, 21, 7, 32, 28, 30, 22, 29, 18, 11, 10, 5, 29, 2, 15, 15, 31, 28, 10, 29, 3, 16, 24, 8, 10, 28, 18, 31, 32, 2, 10, 28, 15, 27, 26, 12, 31, 26, 2, 1, 2, 21, 30, 4, 5, 4, 18, 30, 24, 12, 21, 27, 9, 21, 7, 28, 30, 10, 18, 12, 30, 26, 15, 19, 8, 15, 11, 21, 24, 6, 9, 26, 17, 12, 3, 22, 31, 5, 31, 30, 31, 28, 31, 17, 7, 26, 22, 12, 14, 13, 17, 28, 4, 22, 6, 29, 31, 11, 9, 18, 7, 13, 7, 1, 15, 26, 30, 5, 3, 6, 19, 8, 18, 14, 27, 3, 26, 23, 1, 32, 28, 17, 4, 18, 29, 13, 11, 3, 17, 16, 26, 19, 15, 3, 9, 8, 12, 1, 15, 10, 26, 30, 16, 16, 5, 25, 9, 6, 17, 19, 23, 18, 26, 8, 19, 31, 29, 2, 14, 2, 29, 14, 19, 23, 23, 7, 23, 3, 22, 9, 2, 18, 23, 22, 26, 21, 24, 9, 4, 13, 29, 27, 25, 30, 15, 12, 7, 27, 17, 25, 31, 32, 29, 7, 5, 15, 24, 29, 19, 11, 6, 12, 28, 12, 23, 21, 28, 1, 13, 2, 30, 18, 20, 29, 21, 13, 7, 30, 28, 13, 13, 10, 29, 30, 16, 28, 8, 31, 30, 20, 4, 27, 25, 29, 14, 4, 5, 8, 23, 5, 21, 8, 24, 8, 6, 6, 32, 15, 5, 18, 7, 7, 10, 19, 23, 10, 12, 4, 17, 6, 13, 3, 27, 28, 24, 25, 23, 28, 3, 25, 28, 1, 25, 24, 4, 20, 14, 4, 29, 19, 17, 31, 31, 18, 3, 8, 26, 12, 9, 11, 12, 19, 23, 16, 8, 28, 27, 22, 26, 7, 21, 16, 25, 16, 25, 30, 15, 3, 9, 31, 13, 14, 14, 6, 22, 32, 5, 15, 23, 6, 15, 18, 15, 7, 21, 23, 30, 7, 6, 13, 22, 7, 18, 5, 27, 9, 20, 10, 24, 25, 3, 8, 13, 6, 16, 16, 1, 12, 8, 9, 28, 12, 29, 16, 18, 6, 26, 14, 17, 24, 21, 15, 19, 15, 15, 13, 18, 21, 25, 9, 3, 22, 10, 28, 14, 18, 15, 28, 9, 31, 2, 23, 8, 20, 4, 18, 17, 10, 2, 27, 9, 31, 4, 13, 10, 9, 26, 23, 19, 29, 20, 15, 7, 30, 32, 31, 19, 28, 25, 7, 24, 10, 5, 2, 24, 5, 8, 14, 28, 21, 17, 14, 19, 5, 4, 14, 5, 29, 2, 12, 10, 21, 10, 25, 5, 12, 30, 28, 11, 27, 24, 31, 4, 24, 2, 5, 29, 31, 22, 22, 13, 11, 3, 29, 8, 30, 12, 30, 6, 11, 22, 15, 10, 26, 1, 24, 14, 2, 27, 18, 8, 24, 31, 6, 17, 29, 7, 9, 10, 17, 23, 32, 5, 12, 31, 3, 4, 3, 20, 26, 22, 22, 22, 29, 2, 6, 7, 7, 17, 20, 9, 12, 25, 26, 31, 10, 20, 17, 20, 15, 24, 24, 27, 29, 27, 15, 30, 22, 7, 14, 13, 2, 31, 32, 4, 30, 4, 24, 12, 21, 4, 19, 18, 10, 5, 12, 20, 23, 17, 15, 21, 27, 23, 6, 24, 5, 1, 31, 31, 20, 9, 11, 31, 23, 11, 1, 12, 8, 11, 24, 29, 12, 23, 29, 30, 17, 20, 16, 20, 1, 22, 10, 3, 30, 12, 28, 4, 28, 10, 13, 12]

I a G-Schreiber example [> restart [> with (StringTools ) : with (ListTools ) : with (RandomTools): 1,1],[0,0,1,1,0],[0,0,0,1,1],[0,1,1,0,1],[1,1,1,0,1],[0,1,0,1,0],[1,0,1,0, 0 ], [0,0,0,0,1],[1,1,1,0,0],[0,1,1,1,1],[1,1,0,0,1],[1,0,1,1,1],[1,0,1,0,1], [1,0,0,0,1],[0,0,0,1,0],[0,1,0,0,0],[1,1,1,1,1],[1,1,0,1,1],[0,0,1,0,0],[0, 0,0,0,0]] : nops (Code)