Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id E89D7259 for ; Sun, 26 Feb 2017 06:26:47 +0000 (UTC) X-Greylist: whitelisted by SQLgrey-1.7.6 Received: from mail-io0-f193.google.com (mail-io0-f193.google.com [209.85.223.193]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 905BA88 for ; Sun, 26 Feb 2017 06:26:47 +0000 (UTC) Received: by mail-io0-f193.google.com with SMTP id w10so2801402iod.3 for ; Sat, 25 Feb 2017 22:26:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=+aKINoJUCkv4ZYQ5/4byLd+i2y5Fng0SSlrIoqoFCl4=; b=Q8HNvP+zk7WmOBn4MfXgO3bL2oRpK+fujqpj50laPGDBS1bDZVjrw+y0FC4ng4lzBf 38EmjmAJLDfOgR3994aVwuHm7/dt0am9gUa63dWMUa02Ozo/0CIakAw9oGerqCgS3vtK y4+8xhLH+BQ0ScxhcfXnB8jub4UIPLQHdgihUPisKXslMJnINJRy/YjQNRJfs16IFCG9 0CzfxYtkpPuHmcTrm0GKnmXZNsRWQJSwaOZeV7EuBltZHK6CtBHPVrRjOGYYmtRx2LO8 43f7iOtv9t9C1xtdx7q5KOBOBge5MliJ9JVTgIbdDzAmN2wIz3/1KF/zN0d/Dspvjjol khAA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=+aKINoJUCkv4ZYQ5/4byLd+i2y5Fng0SSlrIoqoFCl4=; b=eX5U23rNJrQi8tLlHabaMfatxKe9nwEJ+pBJRDhh3XKauy8HlVKdsiTe8xJJMwaMbp 4JDbDYpEB5P8um1z+nu2eVNsf/oAKOqjC1F8TRz6IqQTSGUO7m1sDShSssPukYlXdxys CGsowt7KqxmQDRIUGamBFbwTQohOrla2JUA+HU6WGs7m478G4pCquXbJKaXZIDHFkogG nqD3hDbk3O46wLrar2F+5EwtgyorpcioSFZUfun0R3blnSO299cfHvKa9eCIy+XrDDY9 OOlcNs3Ao8RuufoizM3Thl843q70mMjJuHU6rSKl6weNHrmXqLDLEwOb355+/NR56TYi 3zsA== X-Gm-Message-State: AMke39mmH2jjCOlpSBMUkox9qY37uq4ZPXNZ8ZSC6S+lrv9Zw69Y9VuEMg5JLia2N+L6CA== X-Received: by 10.107.187.133 with SMTP id l127mr9302301iof.1.1488090406924; Sat, 25 Feb 2017 22:26:46 -0800 (PST) Received: from [10.0.1.42] (71-81-80-204.dhcp.stls.mo.charter.com. [71.81.80.204]) by smtp.gmail.com with ESMTPSA id w133sm2894769itf.2.2017.02.25.22.26.46 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 25 Feb 2017 22:26:46 -0800 (PST) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 10.2 \(3259\)) From: Steve Davis In-Reply-To: Date: Sun, 26 Feb 2017 00:26:45 -0600 Content-Transfer-Encoding: quoted-printable Message-Id: <4F6C2972-A320-429A-BD13-623B01F390A3@gmail.com> 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> To: Pieter Wuille X-Mailer: Apple Mail (2.3259) X-Spam-Status: No, score=-1.5 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, FREEMAIL_FROM, 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 X-Mailman-Approved-At: Sun, 26 Feb 2017 07:49:12 +0000 Cc: Bitcoin Dev 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: Sun, 26 Feb 2017 06:26:48 -0000 Hi Pieter, > On Feb 25, 2017, at 4:14 PM, Pieter Wuille = wrote: >=20 > Any alternative to move us away from RIPEMD160 would require: > =E2=80=9CAny alternative=E2=80=9D? What about reverting to: [, OP_CHECKSIG] or perhaps later [<=E2=80=9Ccompressed=E2=80=9D public_key>, OP_CHECKSIG] This appears to get away from the issue without introducing a lot of = other concerns? (IIRC the RIPEMD thing was justified on convenience and compactness). Could that be the alternative? /s