From owner-freebsd-security Thu Nov 18 13: 4:47 1999 Delivered-To: freebsd-security@freebsd.org Received: from serenity.mcc.ac.uk (serenity.mcc.ac.uk [130.88.200.93]) by hub.freebsd.org (Postfix) with ESMTP id F09EE14D0B; Thu, 18 Nov 1999 13:04:36 -0800 (PST) (envelope-from jcm@dogma.freebsd-uk.eu.org) Received: from dogma.freebsd-uk.eu.org ([130.88.200.97]) by serenity.mcc.ac.uk with esmtp (Exim 1.92 #3) id 11oYjK-000HkP-00; Thu, 18 Nov 1999 21:04:34 +0000 Received: from localhost (jcm@localhost) by dogma.freebsd-uk.eu.org (8.9.3/8.9.3) with SMTP id VAA07140; Thu, 18 Nov 1999 21:04:33 GMT (envelope-from jcm@dogma.freebsd-uk.eu.org) Date: Thu, 18 Nov 1999 21:04:33 +0000 (GMT) From: Jonathon McKitrick To: peter.jeremy@alcatel.com.au Cc: TrouBle , security@freebsd.org, questions@freebsd.org Subject: Re: secure filesystem wiping In-Reply-To: <99Nov19.074604est.40354@border.alcanet.com.au> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-security@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Fri, 19 Nov 1999, Peter Jeremy wrote: >This isn't technically possible. You can't securely wipe data from a >disk using the disks own R/W head/electronics (which is the only way >to preserve intact files). Why isn't it possible to read unallocated sectors and write back sectors full of garbage, or 0xFF? -jm To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message