Question: 1 Why is it important to study the Feistel cipher? 3.2 What is the difference between a block cipher and a stream cipher? 3.3 Why

1 Why is it important to study the Feistel cipher? 3.2 What is the difference between a block cipher and a stream cipher? 3.3 Why is it not practical to use an arbitrary reversible substitution cipher of the kind shown in Table 3.1? 3.4 What is a product cipher? 3.5 What is the difference between diffusion and confusion? 3.6 Which parameters and design choices determine the actual algorithm of a Feistel cipher? 3.7 Explain the avalanche effect.

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