From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff King Subject: Re: Migrating away from SHA-1? Date: Tue, 12 Apr 2016 19:44:07 -0400 Message-ID: <20160412234406.GC2210@sigill.intra.peff.net> References: <570D78CC.9030807@zytor.com> <1460502934.5540.71.camel@twopensource.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Cc: Stefan Beller , "H. Peter Anvin" , "git@vger.kernel.org" To: David Turner X-From: git-owner@vger.kernel.org Wed Apr 13 01:44:20 2016 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 1aq7yi-0001SM-KK for gcvg-git-2@plane.gmane.org; Wed, 13 Apr 2016 01:44:16 +0200 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966707AbcDLXoL (ORCPT ); Tue, 12 Apr 2016 19:44:11 -0400 Received: from cloud.peff.net ([50.56.180.127]:48312 "HELO cloud.peff.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S932781AbcDLXoK (ORCPT ); Tue, 12 Apr 2016 19:44:10 -0400 Received: (qmail 15420 invoked by uid 102); 12 Apr 2016 23:44:09 -0000 Received: from Unknown (HELO peff.net) (10.0.1.2) by cloud.peff.net (qpsmtpd/0.84) with SMTP; Tue, 12 Apr 2016 19:44:09 -0400 Received: (qmail 12226 invoked by uid 107); 12 Apr 2016 23:44:14 -0000 Received: from sigill.intra.peff.net (HELO sigill.intra.peff.net) (10.0.0.7) by peff.net (qpsmtpd/0.84) with SMTP; Tue, 12 Apr 2016 19:44:14 -0400 Received: by sigill.intra.peff.net (sSMTP sendmail emulation); Tue, 12 Apr 2016 19:44:07 -0400 Content-Disposition: inline In-Reply-To: <1460502934.5540.71.camel@twopensource.com> Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org Archived-At: On Tue, Apr 12, 2016 at 07:15:34PM -0400, David Turner wrote: > It would be possible, of course, to GPG-sign the entire commit's > transitive data (rather than just the SHA1s of same). But as far as I > know, that is not ever what is done. There is a project called git-evtag which does this, and you can find mention on the list. The problem is just that it's not very efficient. That's maybe OK for tag-signing, which is relatively rare. It wouldn't really work for commit-signing. -Peff