Most home computer systems security is in the "low security" category.
Military applications are built to maximal levels of "High Assurance" to allow restricted, authorized access only and protect classified information.
Governments and Commercial Institutions maintain "Medium Assurance" to protect their valuable information.
Home and small business computer systems, however, are much more "user friendly" but offer lower assurance and aren't protected by these maximal levels of security.
The home computer user has to rely on additional software security for protection, and should assume that sooner or later some kind of security breaches are almost inevitable.
Once you've thought about the physical side of your computer security you are ready to tackle the next aspect of computer safety... going online.
When you go online you join over one billion personal computers that are already out there (as of June 2008...ref:Wikipedia).
It is estimated that number will jump to two billion computers by 2014... and more than a few of these users are "the bad guys"... hackers, crackers, scammers and worse.
That's when you really become vulnerable to attack from hackers and cyber criminals.
And that's when you need to get serious about your computer internet security.
The Internet Revolution, Globalization, and the Global Financial Crisis created the perfect storm... Old Business models are being destroyed and jobs are disappearing offshore at an astonishing rate. Analysts warn that "China and India are poised to out-think us and out-compete us by their sheer numbers" and that "there is no job security now".
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Who Ate My Lunch?