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5. Modes of Operation 21 C2 ek ER ex es ex ek ek IV yi 42 Figure 1: Mode of operation for a novel encryption

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5. Modes of Operation 21 C2 ek ER ex es ex ek ek IV yi 42 Figure 1: Mode of operation for a novel encryption mode (a) Specify the encryption formula for Figure 1. (b) Specify the decryption formula for Figure 1. (c) Draw the block diagram for the decryption. (d) Critique this mode of operation and compare it to CBC and CFB in terms of security and efficiency

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