In this chapter, we looked at a variety of network-based
authentication systems, including Sun's Network
Information Service (NIS), Sun's NIS+, Kerberos, and
LDAP. We also looked at how the Pluggable Authentication Module (PAM)
system can be used to transparently integrate any of these
authentication systems with a wide variety of modern Unix offerings.
There are many network-based authentication systems. If you have more
than a few computers to administer, it is likely that you will chose
to deploy one or more of these systems. No matter what you use, be
sure that all authentication information sent across your network is
encrypted. And be sure that the system you plan to deploy runs on all
of the computers that you wish to support. Otherwise, your system may
cause more problems than it solves.