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Information Security

Question 2: NetApp company is a company offering Storage systems, they decided to encrypt customers data using a block cipher with 8-bit blocks that is based on the basic DES architecture (Feistel network) with two rounds and no initial or final permutation. The function for round i is K_i = i * (K-2), for i = 1, 2, where f (K_i , R_i ) = K_i XOR R_i. Using K =1001, and the intermediate values of L₁=1110 and R₁=0110 to find the plain text and ciphertext.

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RO-1110 0-1111 K1= R12 L1 K2= R2- L2