RE: Interesting One
From: Trevor Cushen (Trevor.Cushen@sysnet.ie)Date: 10/30/02
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Date: Wed, 30 Oct 2002 10:29:08 -0000 From: "Trevor Cushen" <Trevor.Cushen@sysnet.ie> To: <security-basics@securityfocus.com>
I believe the DOD level is 7 overwrites before the data is deemed
unrecoverable. Bear in mind however that the DOD practise is to burn
the hard drive as part of the disposal procedure.
I used @Stake autopsy and found it very quick and easy to use for
recovery of deleted files.
BackByte is another good tool but not free like Autopsy. The 30
overwrites and still getting data I don't believe however. I would
imagine the disk was used again about 30 times but the recovered data
was on a section of disk that had not been reused. I don't rule out
that it can be done but not by anything on the market. If you are
really unsure try posting your query to the people at Vogon.
www.vogon.co.uk
They are the best at this stuff bar none. Read some of their news
stories for just how realistic computer forensics is.
Trevor Cushen
Sysnet Ltd
www.sysnet.ie
Tel: +353 1 2983000
Fax: +353 1 2960499
-----Original Message-----
From: Michael Cunningham [mailto:crayola@optonline.net]
Sent: 29 October 2002 19:43
To: Dave Adams; security-basics@security-focus.com
Subject: RE: Interesting One
> Anyway, to get to the point, the guy that came to see me said that
> their forensics guys could read data off a hard drive that had been
> written over up to thirty times. I find this very hard to believe and
> told him I thought
> he was mistaken but the guy was adamant that it could be done.
Yes, it can be done.. it would cost about 100k per drive and the ability
to access an electron scanning microscope. At 30 times I highly doubt
they could recover anything of any value anyway. Using most commercially
available products like "Encase", you can recover files that have been
deleted, but not overwritten. Once the data is overwritten you are
getting into using tools which are not available to the general public
as far as I am aware.
Mike
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