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[debian-knoppix] Re: Secure Deleting


On the matter of secure deleting:

On Tue, Nov 05, 2002 at 12:00:02PM +0100, debian-knoppix-request@linuxtag.org wrote:

> No, after deleting a file, you would use dd to create a big NEW file with zeros
> or random data until your entire filesystem is full. That's the only way in which
> the "unused" blocks of old file versions are being physically overwritten.

New files with zeroes is not a good idea. I recommend everyone to get
yourself a picture of a raster-ray-microscope in the magnectic spectrum
to see what is left after such attemps ... You most probably don't want
to write files to journaled partions if you need to delete them in a
secure manner on a by-file basis.

However, if your systems are not journaled, the dd-method is not too
bad, if you aren't too paranoid. Be sure to use if=/dev/urandom instead
of /dev/zero or /dev/random.


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