Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 7E6B783D for ; Wed, 17 Aug 2016 12:43:51 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from erelay3.ox.registrar-servers.com (erelay3.ox.registrar-servers.com [192.64.117.2]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 7D8F018A for ; Wed, 17 Aug 2016 12:43:50 +0000 (UTC) Received: from localhost (unknown [127.0.0.1]) by erelay1.ox.registrar-servers.com (Postfix) with ESMTP id 9073A220705D for ; Wed, 17 Aug 2016 12:43:49 +0000 (UTC) Received: from erelay1.ox.registrar-servers.com ([127.0.0.1]) by localhost (erelay.ox.registrar-servers.com [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 01sB0TqcMEc2 for ; Wed, 17 Aug 2016 08:43:48 -0400 (EDT) Received: from MTA-07.privateemail.com (unknown [10.20.150.170]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by erelay1.ox.registrar-servers.com (Postfix) with ESMTPS id 01F922207054 for ; Wed, 17 Aug 2016 08:43:48 -0400 (EDT) Received: from APP-06 (unknown [10.20.147.156]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by MTA-07.privateemail.com (Postfix) with ESMTPSA id C7FF160032 for ; Wed, 17 Aug 2016 12:43:47 +0000 (UTC) Date: Wed, 17 Aug 2016 08:43:47 -0400 (EDT) From: Johnson Lau Reply-To: Johnson Lau To: Bitcoin Protocol Discussion Message-ID: <212784600.96759.1471437827809@privateemail.com> In-Reply-To: <835406850.86951.1471342201363@privateemail.com> References: <835406850.86951.1471342201363@privateemail.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_96758_749873152.1471437827753" X-Priority: 3 Importance: Medium X-Mailer: Open-Xchange Mailer v7.8.1-Rev18 X-Originating-Client: open-xchange-appsuite X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00,HTML_MESSAGE, RCVD_IN_DNSWL_LOW autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on smtp1.linux-foundation.org Subject: Re: [bitcoin-dev] New BIP: Low S values signatures 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: Wed, 17 Aug 2016 12:43:51 -0000 ------=_Part_96758_749873152.1471437827753 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit The BIP146 has been updated to include NULLDUMMY* as part of the softfork: https://github.com/bitcoin/bips/pull/435 NULLDUMMY is a trivial softfork to fix malleability related to the extra stack element consumed by CHECKMULTISIG(VERIFY). It is probably more important than LOW_S since without that an attacker may replace the stack element with any value. ------=_Part_96758_749873152.1471437827753 MIME-Version: 1.0 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 7bit

The BIP146 has been updated to include NULLDUMMY* as part of the softfork:

https://github.com/bitcoin/bips/pull/435

NULLDUMMY is a trivial softfork to fix malleability related to the extra stack element consumed by CHECKMULTISIG(VERIFY). It is probably more important than LOW_S since without that an attacker may replace the stack element with any value.

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