Introduction
Installation and setup
Reliability
Hackers
Backups
Encryption
Viruses and trojans
Intrusion prevention
Intrusion detection
Resources
top and ps
Secure SHell (ssh)
rsync
lsof
tcpdump
netstat

Intrusion prevention

Make it less easy for hackers or anyone with physical access to your computer to get in:
  1. Lock the BIOS (with a password) so that you can only boot from C:

  2. Use passwords ALWAYS and make the difficult to guess. There are good password crackers out there.

  3. Don't rely on encryption. Remove private files to floppy and store them physically away.

  4. Don't accept programs or email attachments from "just anywhere". Your level of security is only as high as the origins of your software. This includes things like word-processors, O/S's, etc.

  5. Don't run commands people tell you to via IRC or ICQ.

  6. Don't give anyone unsupervised access to your computer or account.

  7. Don't create security holes (like with "xhost +", or by exporting filesystems using NFS, or by creating NT shares, etc.)

  8. Run as few services as possible.