(Solved): Exercise 1: (Stream Cipher) Use A5\1 to generate 3 key streams from the following registers data xy ...

Exercise 1: (Stream Cipher) Use A5\1 to generate 3 key streams from the following registers data $$\begin{array}{l}x\\ y\\ Z1\end{array}$$ Answer: key streams $$=$$ Exercise 2: (Block Cipher) Consider a block cipher using 8-bit blocks that is based on the basic DES architecture (Feistel network) with two rounds and no initial or final permutation. $$\mathrm{PT}=11011111$$, $$\mathrm{K}=1111$$. Find $${\mathrm{CT}}_2$$