Question: 3 . 4 Keeping in mind that a useful encryption algorithm requires the ability to decrypt, which of the following are possible? a ) An

3.4 Keeping in mind that a useful encryption algorithm requires the ability to decrypt, which of the following are possible?
a) An encryption algorithm for which there are two tuples, key1, block1 and key2, block2, that map to the same ciphertext block.

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