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2. We conduct a known-plaintext attack on an LFSR-based stream cipher. We know that the plaintext sent was: 1001 0010 0110 1101 1001 0010
2. We conduct a known-plaintext attack on an LFSR-based stream cipher. We know that the plaintext sent was: 1001 0010 0110 1101 1001 0010 0110 By tapping the channel we observe the following stream: 1011 1100 0011 0001 0010 1011 0001 a. What is the degree m of the key stream generator? (5 pts) b. What is the initialization vector? (5 pts) c. Determine the feedback coefficients of the LFSR. (10 pts) d. Draw a circuit diagram and verify the output sequence of the LFSR. (10 pts)
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a We can find the key stream by doing XOR of the plain text and the ciphered text which gives ...
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Computer System Architecture
Authors: M. Morris Mano
3rd Edition
0131755633, 978-0131755635
