As daunting as securing your Linux system might seem, one thing to remember is that every extra step makes a difference. It's almost always better to make a modest stride than let uncertainty keep you from starting.
Fortunately, there are a few basic techniques that greatly benefit users at all levels, and knowing how to securely wipe your hard drive in Linux is one of them. Because I adopted Linux primarily with security in mind, this is one of the first things I learned. Once you have absorbed this lesson, you will be able to part with your hard drives safely.
As you might have deduced, the usual way of deleting doesn't always cut it. The most often-used processes for deleting files -- clicking "delete" in the operating system or using the "rm" command -- are not secure.click here for more
source:http://www.technewsworld.com/perl/section/tech-security/
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