NOTE: I NEED ANSWERS WITH DETAILED EXPLANATION. FOR INSTANCE, I KNOW THE ANSWER FOR QUESTION 1 IS 512. BUT I NEED TO KNOW WHY IT IS 512? REST FOR THE SAME, PLEASE. I DON'T WANT TO JUST COPY. I NEED TO UNDERSTAND. IF YOU JUST WRITE 512, I'LL GIVE YOU A THUMBS DOWN!! IF YOU CAN'T GIVE A CLEAR EXPLANATION, PLEASE JUST DON'T ASNWER IT.

THANK YOU.

Given is a stream cipher which uses a single LFSR as key stream generator. The LFSR has a degree of 256.

1. How many plaintext/ciphertext bit pairs are needed to launch a successful attack?

2. Describe all steps of the attack in detail and develop the formulae that need to be solved.

3. What is the key in this system? Why doesnt it make sense to use the initial contents of the LFSR as the key or as part of the key?