From owner-freebsd-security Fri May 21 5:53:39 1999 Delivered-To: freebsd-security@freebsd.org Received: from weathership.homeport.org (breakwater.homeport.org [216.67.13.2]) by hub.freebsd.org (Postfix) with ESMTP id 1C80A1531A for ; Fri, 21 May 1999 05:53:36 -0700 (PDT) (envelope-from adam@weathership.homeport.org) Received: (from adam@localhost) by weathership.homeport.org (8.8.8/8.8.5) id JAA01189; Fri, 21 May 1999 09:09:02 -0400 (EDT) Date: Fri, 21 May 1999 09:09:02 -0400 From: Adam Shostack To: gc Cc: security@FreeBSD.ORG Subject: Re: Secure Deletion Message-ID: <19990521090901.A1155@weathership.homeport.org> References: <3.0.6.32.19990520095507.00840010@india.wind-river.com> <374474D4.2263@iafrica.com.na> <374519D4.403016C2@virtual-pc.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.95.3i In-Reply-To: <374519D4.403016C2@virtual-pc.com>; from gc on Fri, May 21, 1999 at 09:31:16AM +0100 Sender: owner-freebsd-security@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Fri, May 21, 1999 at 09:31:16AM +0100, gc wrote: | Could someone enlighten me as to why the first move is not to write back | an inverted copy of the data to even out the residual field before | resorting to other patterns? (this assumes you are deleting a file and | thus still have the data before you start). You mean other than the fact that it doesn't work? :) See Guttman's paper in Usenix Security 96: http://www.cs.auckland.ac.nz/~pgut001/pubs/secure_del.html Adam -- "It is seldom that liberty of any kind is lost all at once." -Hume To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message