Encryption algorithms

1 What is the OSI security architecture?

2 What is the difference between passive and active security threats?

3 List and briefly define categories of passive and active security attacks.

4 List and briefly define categories of security services.

5 List and briefly define categories of security mechanisms.

1 What are the essential ingredients of a symmetric cipher?

2 What are the two basic functions used in encryption algorithms?

3 How many keys are required for two people to communicate via a cipher?

4 What is the difference between a block cipher and a stream cipher?

5 What are the two general approaches to attacking a cipher?

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