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Re: Shred. Was: Securely wiping...

Subject: Re: Shred. Was: Securely wiping...
Date: Wed, 06 Oct 2004 14:14:32 -0700
Nathan R. Valentine wrote:


   Generally speaking, it is more reliable to shred a device than a
file, since this bypasses the problem of filesystem design mentioned
above.  However, even shredding devices is not always completely
reliable.  For example, most disks map out bad sectors invisibly to the
application; if the bad sectors contain sensitive data, `shred' won't
be able to destroy it.

I'll repeat an assertion that I've made before -- overwriting offers only a probabilistic reassurance that data cannot be reconstructed. Some transparent encryption mechanism in which the key to a file is "lost" provides the ability to "shred" a file, even on read-only or unmounted media.




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