Re: [BugTraq] Peter Gutmann data deletion theaory?

[Richard Clayton <richard () highwayman com>]

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