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From: kudzu at tenebras.com (Michael Sierchio) Subject: Re: [PAPER] Juggling with packets: floating data storage Jason wrote: > May I draw your attention to an old Gutmann paper that is still very > much worth the read. > > http://www.cs.auckland.ac.nz/~pgut001/pubs/secure_del.html > > There is another paper that is also worth the read but sadly I've lost > the last reference to it I had. > > Deletion of data in RAM and even replacing it does not ensure that the > old data is not recoverable. Even the overwriting scheme proposed is not workable in practice, at least not for hard drives or compact flash media -- both of which silently remap sectors when "difficulties" are discovered, such that it is impossible to write to them again because they are invisible to the OS -- but they're visible to direct forensic examination. Only a CPA-IND encryption scheme in which keys are managed separately from the filesystem, and where a key-per-file scheme is in force, and where directories are similarly encrypted is there any degree of provable secure deletion.
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