1) In section 4.1?under the subsection on the motivations for the Feis
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Get it written →1) In section 4.1 under the subsection on the motivations for the Feistel cipher structure. it was stated that for a block of n bits, the number of different reversible mappings for the ideal blockcipher is 2n!. How is this justified?
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2) Describe how with 128 chosen ciphertexts, an adversary can decrypt any ciphertext without knowledge of the secret key k.
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