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Date:      Thu, 18 Nov 1999 16:09:59 -0500 (EST)
From:      Dug Song <dugsong@monkey.org>
To:        Jonathon McKitrick <jcm@dogma.freebsd-uk.eu.org>
Cc:        security@freebsd.org, questions@freebsd.org
Subject:   Re: secure filesystem wiping
Message-ID:  <Pine.BSO.4.10.9911181606420.12081-100000@funky.monkey.org>
In-Reply-To: <Pine.BSF.4.02A.9911182103340.6933-100000@dogma.freebsd-uk.eu.org>

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On Thu, 18 Nov 1999, Jonathon McKitrick wrote:

> Why isn't it possible to read unallocated sectors and write back sectors
> full of garbage, or 0xFF?

this was the topic of a recent thread on comp.security.unix:

http://x44.deja.com/viewthread.xp?AN=542077498&search=thread&svcclass=dncurrent&ST=PS&CONTEXT=942959294.75104298&HIT_CONTEXT=942959294.75104298&HIT_NUM=0&recnum=%3caziS3.1656$4G.29

peter gutmann's excellent paper from the 6th USENIX security symposium is
probably the definitive answer:

	http://www.fish.com/security/secure_del.html

-d.

---
http://www.monkey.org/~dugsong/



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