[40041] in bugtraq
Re: [BugTraq] Peter Gutmann data deletion theaory?
daemon@ATHENA.MIT.EDU (Richard Clayton)
Mon Aug 1 14:57:17 2005
Message-ID: <3C7eGFBraU6CFAVC@highwayman.com>
Date: Thu, 28 Jul 2005 21:57:15 +0100
To: bugtraq@securityfocus.com
From: Richard Clayton <richard@highwayman.com>
In-Reply-To: <20050724001536.GC32500@paradise.net.nz>
MIME-Version: 1.0
In article <20050724001536.GC32500@paradise.net.nz>, Volker Kuhlmann
<list0570@paradise.net.nz> writes
>> Unlike DRAM and SRAM, Flash etc. has no continual or repetitive
>> amplification function. Traces of previous charges may remain, but I
>> doubt they would be recoverable, except perhaps by the most drastic
>> forensic techniques
>
>I would expect flash memory content to be easily recoverable when
>opening the chip.
yes indeed ! there's remnants of charge left on the floating gates of
transistors, even after explicit attempts to erase; and they are
relatively straightforward to read out
have a look at Sergei Skorobogatov's research on this topic (and on data
remanence on semiconductors generally)
http://www.cl.cam.ac.uk/users/sps32/
--
richard Richard Clayton
They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety. Benjamin Franklin
