How many exclusive-or operations are used in the des cipher, Computer Engineering

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How many exclusive-or operations are used in the des cipher

Problem

1. How many permutations are used in a DES cipher algorithm? How many permutations are used in the round-key generator?

2. How many exclusive-or operations are used in the DES cipher?

3. Why does the DES function need an expansion permutation?

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Computer Engineering: How many exclusive-or operations are used in the des cipher

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Computer Engineering: How many exclusive-or operations are used in the des cipher

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