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