Exercise 3: Apply Two round on the basic DES architecture (Feistel network WITH no initial or final permutation) to the string C=11100101 and the key K=0010, where the function f is defined by f(R,K)=R+K ( + is bitwise XOR). AND The function for round i to generate A) Calculate K1, K2? b) What is the Plaintext? Draw the picture of the Feistel Cipher network to help you, and show your intermediate results