Public-key cryptography

1 What are two different uses of public-key cryptography related to key distribution?

2 List four general categories of schemes for the distribution of public keys.

3 What are the essential ingredients of a public-key directory?

4 What is a public-key certificate?

5 What are the requirements for the use of a public-key certificate scheme?

1 What is the purpose of the X.509 standard?

2 What is a chain of certificates?

3 How is an X.509 certificate revoked?

4 Give examples of replay attacks.

5 List three general approaches to dealing with replay attacks.



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