Chapter 12. Hardening Your System

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This chapter covers ways to harden your system further to reduce the likelihood of a successful break-in. The topics covered include:

• "Protecting User Sessions with SSH" on page 409

• "Virtual Private Networks (VPNs)" on page 422

• "Pretty Good Privacy (PGP)" on page 430

• "Using GPG to Encrypt Files the Easy Way" on page 431

• "Firewalls with IP Tables and DMZ" on page 446

• "Firewalls with IP Chains and DMZ" on page 514

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