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Re: forensics Digest 17 Jun 2005 15:04:36 -0000 Issue 499

Subject: Re: forensics Digest 17 Jun 2005 15:04:36 -0000 Issue 499
Date: Wed, 22 Jun 2005 17:11:56 -0400
On Wed, 22 Jun 2005 08:25:01 EDT, tearsong said:
One thought, though: doesn't a reboot reset the RAM anyway?

i have heard (and i wouldnt, by any means, stake my life on this!)
that *only* a soft boot (reboot) will not completely clear the RAM... 
however a hard boot (shut down) will most definatly.  if anyone can
verify/deny this, i'd be grateful.

Way back when, some friends of mine were doing research on RAM chips(*), and we
found out the hard way that at least for some technologies, the state of a
given cell after a power cycle could be dependent on its state before power
cycling happened.  Took quite a while to debug that one - we'd made the rash
assumption that a RAM memory chip started out as either all-zeros or all-ones,
depending how the cells were tied.  Peter Gutmann also mentions it in sections
7 and 8 of his paper http://www.cs.auckland.ac.nz/~pgut001/pubs/secure_del.html

(*) J. Bisgrove, J. Lynch, P. McNulty, W. Abdel-Kader, V. Kletnieks,
W. Kolasinski: "Comparison of soft errors induced by heavy ions and
protons". IEEE Transactions on Nuclear Science, Vol NS-33, No. 6,
p. 1571 (6 Dec 1986)

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