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Problem 4 (2 points). Assume the DES only has 3 rounds instead of 16 rounds. Please explain why a weak key in DES will cause

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Problem 4 (2 points). Assume the DES only has 3 rounds instead of 16 rounds. Please explain why a weak key in DES will cause self-inverting (i.e., Enck(Enck(m))=m, where k is a weak key)

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