1 Consider a block cipher using 8-bit blocks that is based on Feistel network with three rounds and no initial or final permutation. The scrambling function for round i is f(x, K) = (2*i* K) * mod 13, for i = 1, 2,3 where the key K is a member of Z15 and x=3. If K = 5 and the plaintext is 01110100, what is the ciphertext? Draw the picture of the Feistel Cipher network, and show your intermediate results.