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Communication Security: Remote Access and Messaging • Chapter 3 155

4. PGP uses public key cryptography, which uses a “secret” or “pri-
vate” key to encrypt and decrypt messages.
5. Using an open SMTP relay server gives a spammer free reliable
delivery of their messages.
6. Fixes for SMTP relay are available for Microsoft and UNIX e-mail
servers.
7. New e-mail servers that come with SMTP relay are disabled by
default.
8. Spam is unsolicited e-mail messages, much like the advertise-
ments and other junk e-mail that frequently fills home mail-
boxes.
9. Users must know the methods for reducing the amount of spam
they receive.
10. Virus hoaxes are warnings about viruses that do not exist; in
these cases, the hoax itself becomes the virus because well-
meaning people forward it to everyone they know.

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