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1. Briefly explain why the final operation in a Feistel cipher is an additional swap operation. 2. In your own words, briefly explain how Cipher

1. Briefly explain why the final operation in a Feistel cipher is an additional swap operation.

2. In your own words, briefly explain how Cipher Block Chaining mode produces a non-repetitive ciphertext from repetitive plaintext.

Please I need the answer to these questions?? Thanks !!!

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