From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id A8E75486 for ; Sat, 25 Feb 2017 22:35:20 +0000 (UTC) X-Greylist: whitelisted by SQLgrey-1.7.6 Received: from mail-vk0-f53.google.com (mail-vk0-f53.google.com [209.85.213.53]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 9D9B6A1 for ; Sat, 25 Feb 2017 22:35:19 +0000 (UTC) Received: by mail-vk0-f53.google.com with SMTP id r136so27740735vke.1 for ; Sat, 25 Feb 2017 14:35:19 -0800 (PST) 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=FoJyiXIWGuZPp95mqorncTk4h+diZNGw1+KOXjsyChQ=; b=gODyRc0LqPJyFeIVttGe4uca1Kvp86kx/Hr87CxpMuwuTCLSjxgt++pEOt3c6m5ysR ZEln09H7yLAbcogKBiTAskHZmbwV4FTmnyb9Vu6dHsTcRFox6/Lxb9H2uOpPGbRPNaOP qAF2Gos38XejmuRohm95DncOLLrwDtsuBwCCm0r/omFINAXth1mxP2nzAL9aLIo9KvSq mZ67iaJSfFiVIFAI3MxhMIC0Mwf/vyA+2Cph8aPbwbkaK9I5tDVC8HzoXZqrjB/dd2at +KZSyicQ2zQXLrscL8bTb/yFqEjC0LsL1KxCv3A7lu93XxpnYcTmaFR77/Qni1Pes+mc K6Tw== 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=FoJyiXIWGuZPp95mqorncTk4h+diZNGw1+KOXjsyChQ=; b=Avz74itVGifWbg+K/wkhpBipocUZuBmESeVsM2zx7xajvLw03XrYgclHsrMHjFJcQ9 GoZTMcZb73bDOtrGJoT7vmGQHnaC2HgNqBSTCJdlm+ByuL1542xQN1wDrrp+0jBXG7M6 Hn/B7FkBZVeEJeMIn/v9NB9WiGNwx/C5use2YxPHv/2rWvnQ4TG6CI0BowJHXJl4swSq RodqvP7ky+P/VLz52eMNhwvL/VqHRCC8r7AgO/sU9/gYEgTpJDo4Ttpi491kIJKGZIOT KVhwbdb0j+KNEA+VRTxwvJviuEOnDvXMzx4iej4VEtx+smkKaAoYBGK/m0s2tLPWp8Fq l6dQ== X-Gm-Message-State: AMke39mK3tda85QH/lcPi/umvtkfo2/ZoHWhQ449UIySpMMLOz2HFe/q/Y08LlrVC8ErdtzS53G0rlPCc4vJ9A== X-Received: by 10.31.12.65 with SMTP id 62mr3573777vkm.122.1488062118774; Sat, 25 Feb 2017 14:35:18 -0800 (PST) MIME-Version: 1.0 Received: by 10.176.6.106 with HTTP; Sat, 25 Feb 2017 14:34:38 -0800 (PST) In-Reply-To: References: <8F096BE1-D305-43D4-AF10-2CC48837B14F@gmail.com> <20170225010122.GA10233@savin.petertodd.org> <208F93FE-B7C8-46BE-8E00-52DBD0F43415@gmail.com> <20170225191201.GA15472@savin.petertodd.org> <20170225210406.GA16196@savin.petertodd.org> <4FE38F6A-0560-4989-9C53-7F8C94EA4C76@gmail.com> <20170225214018.GA16524@savin.petertodd.org> From: Ethan Heilman Date: Sat, 25 Feb 2017 17:34:38 -0500 Message-ID: To: Pieter Wuille , Bitcoin Protocol Discussion Content-Type: multipart/alternative; boundary=001a1144f324fe4dfc054962755d X-Spam-Status: No, score=-1.5 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, FREEMAIL_FROM, HTML_MESSAGE, RCVD_IN_DNSWL_NONE, RCVD_IN_SORBS_SPAM autolearn=no version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on smtp1.linux-foundation.org Cc: Steve Davis Subject: Re: [bitcoin-dev] SHA1 collisions make Git vulnerable to attakcs by third-parties, not just repo maintainers X-BeenThere: bitcoin-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Bitcoin Protocol Discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 25 Feb 2017 22:35:20 -0000 --001a1144f324fe4dfc054962755d Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable I strongly encourage Bitcoin to move from 80-bit collision resistance (RIPEMD-160) to 128-bit collision resistance (SHA-256). On Sat, Feb 25, 2017 at 5:14 PM, Pieter Wuille via bitcoin-dev < bitcoin-dev@lists.linuxfoundation.org> wrote: > > > On Feb 25, 2017 14:09, "Steve Davis via bitcoin-dev" linuxfoundation.org> wrote: > > Hi Peter, > > > I really, really don=E2=80=99t want to get into it but segwit has many as= pects > that are less appealing, not least of which being the amount of time it > would take to reach the critical mass. > > Surely there's a number of alternative approaches which could be explored= , > even if only to make a fair assessment of a best response? > > > Any alternative to move us away from RIPEMD160 would require: > * A drafting of a softfork proposal, implementation, testing, review. > * A new address format > * Miners accepting the new consensus rules > * Wallets adopting the new address format, both on the sender side and > receiver side (which requires new signatures). > > I.e., exactly the same as segwit, for which most of these are already > done. And it would still only apply to wallets adopting it. > > -- > Pieter > > > _______________________________________________ > bitcoin-dev mailing list > bitcoin-dev@lists.linuxfoundation.org > https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev > > --001a1144f324fe4dfc054962755d Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
I strongly encourage Bitcoin to move from 80-bit collision= resistance (RIPEMD-160) to 128-bit collision resistance (SHA-256).

On Sat, Feb 25, 201= 7 at 5:14 PM, Pieter Wuille via bitcoin-dev <bitcoin= -dev@lists.linuxfoundation.org> wrote:


On Feb 25, 2017 14:09, "Steve Davis via bitcoi= n-dev" <bitcoin-dev@lists.linuxfoundation.org> wrote:
Hi Pet= er,


I really, really don=E2=80=99t want to get into it but segwit has man= y aspects that are less appealing, not least of which being the amount of t= ime it would take to reach the critical mass.

Surely there's a number of alternative approaches which could be explor= ed, even if only to make a fair assessment of a best response?

= Any alternative to move us away from RIPEMD160 would require:
* A drafting of a softfork proposal, implementation, testing, rev= iew.
* A new address format
*= Miners accepting the new consensus rules
* Wallets = adopting the new address format, both on the sender side and receiver side = (which requires new signatures).

I.e., exactly the same as segwit, for which most of these are alr= eady done. And it would still only apply to wallets adopting it.

--=C2=A0
Pieter
=

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bitcoin-dev mailing list
bitcoin-dev@lists.= linuxfoundation.org
https://lists.linuxfoundation.org= /mailman/listinfo/bitcoin-dev


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