A Practical Guide to Ubuntu Linux

Appendix C. Security

<feature><title></title>

IN THIS APPENDIX

Encryption	992
File Security	997
Email Security	997
Network Security	998
Host Security	1001
Login Security	1002
Remote Access Security	1003
Viruses and Worms	1004
Physical Security	1004
Security Resources	1006

</feature>

Security is a major part of the foundation of any system that is not totally cut off from other machines and users. Some aspects of security have a place even on isolated machines. Examples of these measures include periodic system backups, BIOS or power-on passwords, and self-locking screensavers.

A system that is connected to the outside world requires other mechanisms to secure it: tools to check files (tripwire), audit tools (tiger/cops), secure access methods (kerberos/ssh), services ...