1. In the context of Kerberos, what is a principal?
2. What are the ingredients of a authentication server’s ticket? Explain the significance of each.
3. List the environmental shortcomings and technical deficiencies of Kerberos version 4.
4. What is a public-key certificate?
5. What is a X.509 certificate?
6. Why is it sometimes desirable to revoke an X.509 certificate before it expires?