From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on dcvr.yhbt.net X-Spam-Level: X-Spam-ASN: AS31976 209.132.180.0/23 X-Spam-Status: No, score=-2.7 required=3.0 tests=AWL,BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,RCVD_IN_DNSWL_HI,RCVD_IN_SORBS_SPAM, RP_MATCHES_RCVD shortcircuit=no autolearn=no autolearn_force=no version=3.4.0 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by dcvr.yhbt.net (Postfix) with ESMTP id 1BEE7209B8 for ; Thu, 14 Sep 2017 15:45:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751323AbdINPpU (ORCPT ); Thu, 14 Sep 2017 11:45:20 -0400 Received: from mail-it0-f50.google.com ([209.85.214.50]:45313 "EHLO mail-it0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751255AbdINPpT (ORCPT ); Thu, 14 Sep 2017 11:45:19 -0400 Received: by mail-it0-f50.google.com with SMTP id v19so537674ite.0 for ; Thu, 14 Sep 2017 08:45:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=rl09XYn5Uu1RJfqjFaanajW3rx4Ob+eg44oAV1/yJZ4=; b=m9l59KHJt3mxRTnLKFusakNyi8a8mdcebu5thvNbfDVwR3zHecErSV8ZXAqe1VO28h HHXkA1AST4do+WI0XDOV8NCATFVY8ChpywX/GmDvt47CSegqYtSIrRwJUDQ2SQuIxZbw G2q06Lrlc5XdVnN1rVFf4Ef4I/b7fh5jNATDoq2lpf8krwksoydjnO8RBqiP2ESVSQMF MoKBOsHxaSfoFAnIaNy+JBs31vt0VdsLMjNL24Sk6cKUPXqeNZtAHzmkqQwc8eQI9A1w 1E7ewok4YjPArkjnpXgVe4emszZr8oqGsAVfrKjNxjPkTyX0wbWlNr6rXK/XJKobxaMO N4Fw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=rl09XYn5Uu1RJfqjFaanajW3rx4Ob+eg44oAV1/yJZ4=; b=uHtdHZfj1i99pgo/55GwZNGL0qDl5gJvZ8p2fAPUVwDeyGJlmraT+/O2O+52hJx7WZ UB39CvkZsv7EwBKEzjeUSn/pvpgfHd18hpwB+JmidcKciIk1YEvTUfrJ9rF/Nlh+TLf4 ZnVFszyDN2mSJHaXUh4shC/Q3FeoHAh029NVjaH2Rd3CZcJ/RR5WJmw5v6mujbouvp9r Uu0oR+xO1gz6x6Z9CnZS5PBv4MwG5lFrud+zFZI/bEDP4BA/sOjptgb3G/4pGdIZszKg bv2Ljolhz6uI3LQ9/yoE+WjQjYP6+f6zilLyQY1TiJT9rHNqJZsjs0hF67LUMsOH9Tqa FeAA== X-Gm-Message-State: AHPjjUhX0WaCqm2i7BBWk8x+FyfjdD7dVQMQSMKUsTYd0sebWnXsyXn7 7iFb6Ug+qQ+ONccE2xi6XpSPwQs3LvBYv5vn/Ew= X-Google-Smtp-Source: AOwi7QCff8rw36JMneSvbCxWm/ZqVljPmyztH0NTODOta7ZP7IuYwSGaxSUJ1wyG3nIlE3mfGTxvmEBrhu4l0Fywfl8= X-Received: by 10.36.68.207 with SMTP id o198mr724025ita.74.1505403919313; Thu, 14 Sep 2017 08:45:19 -0700 (PDT) MIME-Version: 1.0 Received: by 10.107.164.4 with HTTP; Thu, 14 Sep 2017 08:45:18 -0700 (PDT) In-Reply-To: References: <20170304011251.GA26789@aiede.mtv.corp.google.com> <20170307001709.GC26789@aiede.mtv.corp.google.com> <20170911185913.GA5869@google.com> <20170913163052.GA27425@aiede.mtv.corp.google.com> <20170913221854.GP27425@aiede.mtv.corp.google.com> From: demerphq Date: Thu, 14 Sep 2017 17:45:18 +0200 Message-ID: Subject: Re: RFC v3: Another proposed hash function transition plan To: Johannes Schindelin Cc: Junio C Hamano , Jonathan Nieder , Stefan Beller , Brandon Williams , Linus Torvalds , Git Mailing List , Jonathan Tan , Jeff King , David Lang , "brian m. carlson" Content-Type: text/plain; charset="UTF-8" Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org On 14 September 2017 at 17:23, Johannes Schindelin wrote: > Hi Junio, > > On Thu, 14 Sep 2017, Junio C Hamano wrote: > >> Jonathan Nieder writes: >> >> > In other words, a long lifetime for the hash absolutely is a design >> > goal. Coping well with an unexpectedly short lifetime for the hash is >> > also a design goal. >> > >> > If the hash function lasts 10 years then I am happy. >> >> Absolutely. When two functions have similar expected remaining life >> and are equally widely supported, then faster is better than slower. >> Otherwise our primary goal when picking the function from candidates >> should be to optimize for its remaining life and wider availability. > > SHA-256 has been hammered on a lot more than SHA3-256. Last year that was even more true of SHA1 than it is true of SHA-256 today. Anyway, Yves -- perl -Mre=debug -e "/just|another|perl|hacker/"