From owner-freebsd-questions@FreeBSD.ORG Tue Jan 18 17:15:52 2011 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id CDD6B106566B for ; Tue, 18 Jan 2011 17:15:52 +0000 (UTC) (envelope-from rsmith@xs4all.nl) Received: from smtp-vbr4.xs4all.nl (smtp-vbr4.xs4all.nl [194.109.24.24]) by mx1.freebsd.org (Postfix) with ESMTP id 621FD8FC1F for ; Tue, 18 Jan 2011 17:15:51 +0000 (UTC) Received: from slackbox.erewhon.net (slackbox.xs4all.nl [213.84.242.160]) by smtp-vbr4.xs4all.nl (8.13.8/8.13.8) with ESMTP id p0IHFpHm075062 for ; Tue, 18 Jan 2011 18:15:51 +0100 (CET) (envelope-from rsmith@xs4all.nl) Received: by slackbox.erewhon.net (Postfix, from userid 1001) id A3955BAAB; Tue, 18 Jan 2011 18:15:50 +0100 (CET) Date: Tue, 18 Jan 2011 18:15:50 +0100 From: Roland Smith To: freebsd-questions@freebsd.org Message-ID: <20110118171550.GA64143@slackbox.erewhon.net> References: <4D34A6EF.30600@alokat.org> <20110117225308.GA40523@slackbox.erewhon.net> <20110118070719.GA51692@slackbox.erewhon.net> <20110118161040.GC76347@libertas.local.camdensoftware.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="T4sUOijqQbZv57TR" Content-Disposition: inline In-Reply-To: <20110118161040.GC76347@libertas.local.camdensoftware.com> X-GPG-Fingerprint: 1A2B 477F 9970 BA3C 2914 B7CE 1277 EFB0 C321 A725 X-GPG-Key: http://www.xs4all.nl/~rsmith/pubkey.txt X-GPG-Notice: If this message is not signed, don't assume I sent it! User-Agent: Mutt/1.5.21 (2010-09-15) X-Virus-Scanned: by XS4ALL Virus Scanner Subject: Re: harddrive encryption X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 18 Jan 2011 17:15:52 -0000 --T4sUOijqQbZv57TR Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Jan 18, 2011 at 08:10:40AM -0800, Chip Camden wrote: > It seems prudent to me to reduce the attack surface to that which really > needs to be defended -- "When you defend everything, you defend nothing". > Not to mention avoiding the overhead of encrypting OS files. Indeed. =20 > What do you folks think of the relative merits of AES vs Blowfish for > disk encryption? Neither have been broken with their complete number of rounds. Versions of both can be broken with a reduced number of rounds. See http://www.schneier.com/paper-blowfish-oneyear.html for some analysis of blowfish, and e.g. http://www.schneier.com/paper-rijndael.html for several attacks on Rijndael with reduced rounds. It looks like both are viable choices today. Certainly good enough to prote= ct your data in case of hardware theft. No encryption method is secure against lead-pipe cryptanalysis. [http://www.schlockmercenary.com/2009-10-19] :-) But it seems like a safe bet that there will be more effort spent on breaki= ng AES/Rijndael. Roland --=20 R.F.Smith http://www.xs4all.nl/~rsmith/ [plain text _non-HTML_ PGP/GnuPG encrypted/signed email much appreciated] pgp: 1A2B 477F 9970 BA3C 2914 B7CE 1277 EFB0 C321 A725 (KeyID: C321A725) --T4sUOijqQbZv57TR Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.16 (FreeBSD) iEYEARECAAYFAk01ysYACgkQEnfvsMMhpyV7hwCfRn+SQyB9IeIaiv/gvHaPiEIK HNAAn2zS40QgLZPZUrRzrFQWQI4shh4f =sJ+w -----END PGP SIGNATURE----- --T4sUOijqQbZv57TR--