1)	Why is badmail setgid instead of setuid?  Put another way,
	what problem am I avoiding by that choice?  (Hint: what
	privileges does the owner of a file have?)

2)	Programs like ftpd switch between privileged and unprivileged
	mode, depending on what they're doing.  Binding to privileged
	sockets requires root permissions; opening files for a user
	requires user permissions.  Should the program run as root
	most of the time, and only assume user privileges as needed,
	or should it run as the user most of the time, and only assume
	root as needed?  Explain.

3)	Suppose that all cryptographic keys were stored in a separate
	machine on the network.  To use a key, you have to contact this
	machine.  Is this a good or a bad idea?  Explain?

4)	Explain the advantages and disadvantages of a public hacking
	contest as a form of "tiger team".