Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S275478AbTHNUHg (ORCPT ); Thu, 14 Aug 2003 16:07:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S275482AbTHNUHg (ORCPT ); Thu, 14 Aug 2003 16:07:36 -0400 Received: from zcars0m9.nortelnetworks.com ([47.129.242.157]:7923 "EHLO zcars0m9.nortelnetworks.com") by vger.kernel.org with ESMTP id S275478AbTHNUHe (ORCPT ); Thu, 14 Aug 2003 16:07:34 -0400 Message-ID: <3F3BEBFB.7010003@nortelnetworks.com> Date: Thu, 14 Aug 2003 16:07:23 -0400 X-Sybari-Space: 00000000 00000000 00000000 00000000 From: Chris Friesen User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.8) Gecko/20020204 X-Accept-Language: en-us MIME-Version: 1.0 To: David Wagner Cc: linux-kernel@vger.kernel.org Subject: Re: [RFC][PATCH] Make cryptoapi non-optional? References: <20030809173329.GU31810@waste.org> <20030813032038.GA1244@think> <20030813040614.GP31810@waste.org> <20030814165320.GA2839@speare5-1-14> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 922 Lines: 27 David Wagner wrote: > I don't see where you are getting this from. Define > F(x) = first80bits(SHA(x)) > G(x) = first80bits(SHA(x)) xor last80bits(SHA(x)). > What makes you think that F is a better (or worse) hash function than G? > > I think there is little basis for discriminating between them. > If SHA is cryptographically secure, both F and G are fine. In this case we can save the bother of doing the xor, no? Chris -- Chris Friesen | MailStop: 043/33/F10 Nortel Networks | work: (613) 765-0557 3500 Carling Avenue | fax: (613) 765-2986 Nepean, ON K2H 8E9 Canada | email: cfriesen@nortelnetworks.com - 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/