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Article #188Re: random or urandom???
From: Wim Ton
Date: Tue, 10 Sep 2002 21:27
Date: Tue, 10 Sep 2002 21:27
19 lines
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2447 bytes
Hi, I do not think that the random/encryption algo make any difference. The attacker is interested in what is not visible. The attacker will try to subtrack the overwriting data form the signal, and in this case it does not matter what the overwriting signal was, because it is clearly readable. The signal were they are after, is the magnetic field that is slightly outside the track, caused by head placement tolerance or diffusion. The old algorithmn of writing all 1's thane all 0's and than a fixed pattern is ment to counter the effect of magnetic hysterese. Complete erasure is difficult, I have seen a report were they had to use AC fields followed by DC fields from a superconducting magnet. And that was before GMR heads Wim
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