Chapter 3. Security Review: The Upper Layers
If you refer to Figure 2.1, you’ll notice that the hourglass gets wide at the top, very wide. There are many, many different applications, most of which have some security implications. This chapter just touches the highlights.
Messaging
In this section, we deal with mail transport protocols. SMTP is the most common mail transport protocol—nearly every message is sent this way. Once mail has reached a destination spool host, however, there are several options for accessing that mail from a dumb server.
SMTP
One of the most popular Internet services is electronic mail. Though several services can move mail on the net, by far the most common is Simple Mail Transfer Protocol (SMTP) [Klensin, 2001].
Traditional ...
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