Answer the following below: 1. The process where a sequence of plaintext elements is replaced by a permutation of the sequence; in other words, no elements are added and deleted or replaces in the sequence, rather the order in which the elements appear in the sequence is changed known as what process? 2. The process where each plaintext element or group of elements is uniquely replaced by a corresponding ciphertext element or group of elements defines what process? 3. What is the average block size when using a block cipher?

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