Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S275692AbTHOHkN (ORCPT ); Fri, 15 Aug 2003 03:40:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S275700AbTHOHkN (ORCPT ); Fri, 15 Aug 2003 03:40:13 -0400 Received: from rth.ninka.net ([216.101.162.244]:25475 "EHLO rth.ninka.net") by vger.kernel.org with ESMTP id S275692AbTHOHkK (ORCPT ); Fri, 15 Aug 2003 03:40:10 -0400 Date: Fri, 15 Aug 2003 00:40:04 -0700 From: "David S. Miller" To: Andries Brouwer Cc: val@nmt.edu, daw@mozart.cs.berkeley.edu, linux-kernel@vger.kernel.org Subject: Re: [RFC][PATCH] Make cryptoapi non-optional? Message-Id: <20030815004004.52f94f9a.davem@redhat.com> In-Reply-To: <20030815093003.A2784@pclin040.win.tue.nl> References: <20030809173329.GU31810@waste.org> <20030813032038.GA1244@think> <20030813040614.GP31810@waste.org> <20030814165320.GA2839@speare5-1-14> <20030815001713.GD5333@speare5-1-14> <20030815093003.A2784@pclin040.win.tue.nl> X-Mailer: Sylpheed version 0.9.2 (GTK+ 1.2.10; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 785 Lines: 23 On Fri, 15 Aug 2003 09:30:03 +0200 Andries Brouwer wrote: > On Thu, Aug 14, 2003 at 06:17:13PM -0600, Val Henson wrote: > > > entropy(x) >= entropy(x xor y) > > entropy(y) >= entropy(x xor y) > > Is this trolling? Are you serious? These lemma are absolutely true. XOR is the worst way to gain entropy because it means that if you are able to know anything about either 'x' or 'y' then you are able to know something about the resulting entropy. It is the reason our ipv4 routing cache hashes used to be exploitable. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/