From owner-freebsd-security Thu Nov 18 23: 0:39 1999 Delivered-To: freebsd-security@freebsd.org Received: from ind.alcatel.com (postal.xylan.com [208.8.0.248]) by hub.freebsd.org (Postfix) with ESMTP id 4A19215592; Thu, 18 Nov 1999 23:00:36 -0800 (PST) (envelope-from wes@softweyr.com) Received: from mailhub.xylan.com (mailhub [198.206.181.70]) by ind.alcatel.com (8.9.3+Sun/8.9.1 (ind.alcatel.com 3.0 [OUT])) with SMTP id XAA26732; Thu, 18 Nov 1999 23:00:08 -0800 (PST) X-Origination-Site: Received: from omni.xylan.com by mailhub.xylan.com (SMI-8.6/SMI-SVR4 (mailhub 2.1 [HUB])) id XAA02388; Thu, 18 Nov 1999 23:00:07 -0800 Received: from softweyr.com ([204.68.178.39]) by omni.xylan.com (4.1/SMI-4.1 (xylan engr [SPOOL])) id AA21036; Thu, 18 Nov 99 23:00:04 PST Message-Id: <3834F573.EE821665@softweyr.com> Date: Fri, 19 Nov 1999 00:00:03 -0700 From: Wes Peters Organization: Softweyr LLC X-Mailer: Mozilla 4.7 [en] (X11; U; FreeBSD 3.1-RELEASE i386) X-Accept-Language: en Mime-Version: 1.0 To: Barrett Richardson Cc: Kris Kennaway , TrouBle , David G Andersen , freebsd-security@FreeBSD.ORG Subject: Re: secure filesystem wiping References: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-security@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Barrett Richardson wrote: > > Wes Peters wrote: > > > > I've tested obliterate on some rather large files (250 MB) and it exhausts > > the system entropy pool very quickly, even on a system with a busy network. > > Does anyone make a hardware entropy device? ;^) > > > > How about pseudo-random data? Aren't the passes with random data just > a little extra icing? > > Also, will my system choke if I mmap a 250 MB file on a system > with 32 MB of ram? That was why I was thinking of obliterating > files in strips. Mine don't choke when I mmap 250 MB files on a system with 512MB of RAM. I guess that's not quite the same, but it does have two processes doing this at the same time; one on each processor. -- "Where am I, and what am I doing in this handbasket?" Wes Peters Softweyr LLC wes@softweyr.com http://softweyr.com/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message