One of the worlds most wanted hacker turned security productive member ~ geekypedia

Kevin Mitnick came by his security expertise the hard way. In the 1990s, his electronic penetration of some of the biggest companies in the world made him a notorious tech boogieman, and ultimately landed him five years in prison.

Now free and clear, Mitnick has reinvented himself as a computer security consultant and writer. He travels the world teaching organizations how to secure their information in a world of corporate spies and younger versions of himself. He took a break from his jet-setting to share some practical security tips. Clip them and stick them on your parents' refrigerator or your IT administrator's white board.

Here is Top 10 list of steps you should take to protect your information and your computing resources from the bad boys and girls of cyberspace:

Back up everything! You are not invulnerable. Catastrophic data loss can happen to you -- one worm or Trojan is all it takes.
Choose passwords that are reasonably hard to guess -- don't just append a few numbers to a no-brainer. Always change default passwords.
Use an antivirus product like AVG or Norton, and set it to update daily.
Update your OS religiously and be vigilant in applying all security patches released by the software manufacturer.
Avoid hacker-bait apps like Internet Explorer and disable automatic scripting on your e-mail client.
Use encryption software like PGP (pretty good privacy) when sending sensitive e-mail. You can also use it to protect your entire hard drive.
Install a spyware detection app -- or even several. Programs that can be set to run frequently, like SpyCop, are ideal.
Use a personal firewall. Configure it to prevent other computers, networks and sites from connecting to you, and specify which programs are allowed to connect to the net automatically.
Disable any system services you're not using, especially apps that could give others remote access to your computer (like Remote Desktop, RealVNC and NetBIOS).
Secure your wireless networks. At home, enable WPA (Wi-Fi protected access) with a password of at least 20 characters. Configure your laptop to connect in Infrastructure mode only, and don't add networks unless they use WPA.

Today, Mitnick has been able to move past his role as a black hat hacker and become a productive member of society. He served five years, about 8 months of it in solitary confinement, and is now a computer security consultant, author and speaker.