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P1. A message has 2000 characters. If it is supposed to be encrypted using a block cipher of 64 bits, find the size of the

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P1. A message has 2000 characters. If it is supposed to be encrypted using a block cipher of 64 bits, find the size of the padding and the number of blocks. P2. The input/output relation in a 2*2 S-Box is shown by the following table. Find out the table for the inverse S-Box Input: right bit 0 Input: left bit 01 11 1 1000

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