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20. Suppose that we use a block cipher to encrypt according to the rule C0 = IV xor (P0 ,K), C1 = C0 xor E(P1,

20. Suppose that we use a block cipher to encrypt according to the rule

C0 = IV xor (P0 ,K), C1 = C0 xor E(P1, K), C2= C1 xor E(P2,K),...

a. What is the corresponding decryption rule?

b. Give two security disadvantages of this mode as compared to CBC

mode

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