1. In general words, describe the overall authentication scheme of Kerberos V5 including the advantages and disadvantages in regard to performance and security protection. Include how Kerberos V5 handles tickets.

2. Consider the following variant of Kerberos. Instead of having postdated or renewable tickets (2 types of tickets), a server, which notes that the start-time is older than some limit, presents the ticket to the TGS and asks if it should believe the ticket. What are the trade-offs of this approach to the Kerberos V5 approach? (You will need to understand the Kerberos V process to answer this.)