QUESTION 1 a) Write your UB number as a 32 -bit vector by converting each digit in the number into a 4-bit binary number (see example below). This will be the plaintext for this question. b) Construct enough of the output sequence of the linear feedback shiit register (LFSR) with connection polynomial (4,1+D1+D2) and initial state [0, 0,1,1] to determine the prefix and the period of its output sequence. c) Assume that LFSR 1 produces the output sequence of period 5 that starts 1,0,1,1,0, LFSR 2 produces the oulput sequence of period 3 that starts 1,1,0, and LFSR 3 produces the oulput sequence of period 7 that starts 1,1,0,1,1,0,0,. Give the first 32 bits of the kevstream calculated by the Geffe generator, whose block diagram is below. 1 d) Use the keystream you calculated in part c) to encrypt the plaintext you calculated in part a) by