Key Distribution and User Authentication

1 List ways in which secret keys can be distributed to two communicating parties.

2 What is the difference between a session key and a master key?

3 What is a key distribution center?

4 What entities constitute a full-service Kerberos environment?

5 In the context of Kerberos, what is a realm?

6 What are the principal differences between version 4 and version 5 of Kerberos?

7 What is a nonce?

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

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

10 What is a public-key certificate?

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

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

13 What is a chain of certificates?

14 How is an X.509 certificate revoked?