Proble1 compare the substitution in des and aes why do we, Ask an Expert

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Proble

1. Compare the substitution in DES and AES. Why do we have only one substitution table (S-box) in AES. but several in DES?

2. Compare the permutations in DES and AES. Why do we need expansion and compression permutations in DES. but not in AES?

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