1 Explain the avalanche effect.
2 Briefly define a group.
3 Briefly define a ring.
4 Briefly define a field.
5 What does it mean to say that b is a divisor of a?
1 What is the difference between a block cipher and a stream cipher?
2 Why is it not practical to use an arbitrary reversible substitution cipher of the kind?
3 What is a product cipher?
4 What is the difference between diffusion and confusion?
5 Which parameters and design choices determine the actual algorithm of a Feistel cipher?
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