From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sebastian Schuberth Subject: Exploiting SHA1's "XOR weakness" allows for faster hash calculation Date: Wed, 05 Dec 2012 10:19:43 +0100 Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit To: git@vger.kernel.org X-From: git-owner@vger.kernel.org Wed Dec 05 10:20:22 2012 Return-path: Envelope-to: gcvg-git-2@plane.gmane.org Received: from vger.kernel.org ([209.132.180.67]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1TgB9R-0005nc-4W for gcvg-git-2@plane.gmane.org; Wed, 05 Dec 2012 10:20:21 +0100 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752216Ab2LEJUF (ORCPT ); Wed, 5 Dec 2012 04:20:05 -0500 Received: from plane.gmane.org ([80.91.229.3]:53111 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751737Ab2LEJUD (ORCPT ); Wed, 5 Dec 2012 04:20:03 -0500 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1TgB9D-0005WS-2O for git@vger.kernel.org; Wed, 05 Dec 2012 10:20:09 +0100 Received: from 192.100.123.82 ([192.100.123.82]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 05 Dec 2012 10:20:07 +0100 Received: from sschuberth by 192.100.123.82 with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 05 Dec 2012 10:20:07 +0100 X-Injected-Via-Gmane: http://gmane.org/ X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: 192.100.123.82 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:17.0) Gecko/17.0 Thunderbird/17.0 Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org Archived-At: Hi, to say it in advance: I do not want to trigger any bogus security discussion here. Instead, I believe the findings from [1] allow for an up to 20% faster SHA1 calculation, if my brief reading of the presentation is correct. Any opinions on integration this optimization into Git? [1] https://hashcat.net/p12/js-sha1exp_169.pdf -- Sebastian Schuberth