a) Write your UB number as a 32-bit vector by converting each digit in the number...
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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. UB number: 2 2 0 3 1 5 Bit vector. 0000 1000 0000 0001 0010 0011 b) Construct enough of the output sequence of the linear feedback shift register (LFSR) with connection polynomial (4, 1+ D1 + Ds) 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 output sequence of period 3 that starts and LFSR 3 produces the output sequence of period 7 that starts Give the first 32 bits of the keystream calculated by the Geffe generator, whose block diagram is below. 1,1,0,. 1, 1, 0, 1, 1, 0, 0, LSFR 1 XI LSFR 2 X2 7 0 0101 0010 LSFR 3 X3 7 Keystream d) Use the keystream you calculated in part c) to encrypt the plaintext you calculated in part a) by choing them together. PARK 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. UB number: 2 2 0 3 1 5 Bit vector. 0000 1000 0000 0001 0010 0011 b) Construct enough of the output sequence of the linear feedback shift register (LFSR) with connection polynomial (4, 1+ D1 + Ds) 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 output sequence of period 3 that starts and LFSR 3 produces the output sequence of period 7 that starts Give the first 32 bits of the keystream calculated by the Geffe generator, whose block diagram is below. 1,1,0,. 1, 1, 0, 1, 1, 0, 0, LSFR 1 XI LSFR 2 X2 7 0 0101 0010 LSFR 3 X3 7 Keystream d) Use the keystream you calculated in part c) to encrypt the plaintext you calculated in part a) by choing them together. PARK
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