Question: 1.(Please answer the following question: 1) What is diffusion? 2)In DES, does Initial Permutation and Final Permutation increase security of DES? 3) In the Feistel

1.(Please answer the following question:

1) What is diffusion?

2)In DES, does Initial Permutation and Final Permutation increase security of DES?

3) In the Feistel structure, which part got encrypted? why is that?

4)Is DES secure? Why?

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