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.

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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.

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