
14 Chapter 1
nonrepudiation, and authenticity. These terms have very spe-
cific meanings, which we’ll discuss in this chapter. As an end
user, you should understand how OpenPGP works so that you
understand its limitations.
OpenPGP can do only six things, which are all missing
from today’s email architecture, and are extremely valuable
in many circumstances. What you do with OpenPGP is deter-
mined by which of the six tasks you want to accomplish. Have a
look at Table 1-1.
Table 1-1: Key Usages
Desired Effect Action
I want anyone who reads this message to
know beyond a doubt that I sent it—I cannot
repudiate it.
Digitally sign the message with your ...