Similar to Problem 2.10 in the textbook(Understanding Cryptography): We conduct a known-plaintext attack on an LFSR-based stream cipher. We know that the plaintext sent was: 1011 0110 1110 1001 1000 1010 1110 By tapping the channel we observe the following stream: 1001 1000 1011 0101 0011 0011 1001

1. What is the degree m of the key stream generator? ( )

2. What is the initialization vector? (in the order z0 z1 z2) ( )

3. Determine the feedback coefficients of the LFSR. (in the order c0 c1 c2) ( )

4. Draw a circuit diagram and verify the output sequence of the LFSR. If it starts with the initialization vector what would be its contents after 5 clock signals? (in the order z0 z1 z2) ( )