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Article #189Re: random or urandom???
From: David
Date: Thu, 12 Sep 2002 18:47
Date: Thu, 12 Sep 2002 18:47
30 lines
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2586 bytes
Wim Ton wrote: > > 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 I always liked the "drop it from the roof" technique myself :) -- David Filion filiond[at]videotron[dot]ca Linux counter #195143 "Yes, it's manly, but let's face it, so is bungee-jumping with the cord tied to your testicles." -- Linus Torvalds
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 1041dd,28c4c3b7567c439e X-Google-Attributes: gid1041dd,public X-Google-Thread: 111514,28c4c3b7567c439e X-Google-Attributes: gid111514,public X-Google-Thread: fc814,28c4c3b7567c439e X-Google-Attributes: gidfc814,public X-Google-Thread: 106e9e,28c4c3b7567c439e X-Google-Attributes: gid106e9e,public X-Google-Thread: 100c5f,28c4c3b7567c439e X-Google-Attributes: gid100c5f,public X-Google-ArrivalTime: 2002-09-12 11:50:57 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!cyclone.bc.net!snoopy.risq.qc.ca!wesley.videotron.net!wagner.videotron.net.POSTED!not-for-mail Message-ID: <3D80E14C.E257872@videotron.ca> From: David <filiond@videotron.ca> X-Mailer: Mozilla 4.79 [en] (WinNT; U) X-Accept-Language: en MIME-Version: 1.0 Newsgroups: alt.linux,alt.os.linux.suse,at.tuwien.lva.se-linux,comp.os.linux.security,comp.security Subject: Re: random or urandom??? References: <3d7cd0f2$0$25296$91cee783@newsreader01.highway.telekom.at> <alil7b$1qm7an$1@ID-125932.news.dfncis.de> <m3d6rmm9mi.fsf@mika.informatik.uni-freiburg.de> <4rOf9.36957$rd2.30338@news-binary.blueyonder.co.uk> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 30 Date: Thu, 12 Sep 2002 14:47:40 -0400 NNTP-Posting-Host: 207.96.202.130 X-Complaints-To: abuse@videotron.ca X-Trace: wagner.videotron.net 1031856651 207.96.202.130 (Thu, 12 Sep 2002 14:50:51 EDT) NNTP-Posting-Date: Thu, 12 Sep 2002 14:50:51 EDT