From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sog-mx-1.v43.ch3.sourceforge.com ([172.29.43.191] helo=mx.sourceforge.net) by sfs-ml-2.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1WMBAL-0000Ga-N2 for bitcoin-development@lists.sourceforge.net; Sat, 08 Mar 2014 06:55:25 +0000 Received-SPF: pass (sog-mx-1.v43.ch3.sourceforge.com: domain of gmail.com designates 209.85.192.177 as permitted sender) client-ip=209.85.192.177; envelope-from=edmund.edgar@gmail.com; helo=mail-pd0-f177.google.com; Received: from mail-pd0-f177.google.com ([209.85.192.177]) by sog-mx-1.v43.ch3.sourceforge.com with esmtps (TLSv1:RC4-SHA:128) (Exim 4.76) id 1WMBAJ-0005Bk-WC for bitcoin-development@lists.sourceforge.net; Sat, 08 Mar 2014 06:55:25 +0000 Received: by mail-pd0-f177.google.com with SMTP id g10so4958206pdj.36 for ; Fri, 07 Mar 2014 22:55:18 -0800 (PST) MIME-Version: 1.0 X-Received: by 10.68.129.201 with SMTP id ny9mr27225928pbb.70.1394261718204; Fri, 07 Mar 2014 22:55:18 -0800 (PST) Sender: edmund.edgar@gmail.com Received: by 10.68.32.5 with HTTP; Fri, 7 Mar 2014 22:55:18 -0800 (PST) Date: Sat, 8 Mar 2014 15:55:18 +0900 X-Google-Sender-Auth: u_4LKXWZhpIESb4NZ9HQm-5AJzU Message-ID: From: Edmund Edgar To: bitcoin-development@lists.sourceforge.net Content-Type: multipart/alternative; boundary=047d7b10cae57005af04f412dae3 X-Spam-Score: -0.5 (/) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. -1.5 SPF_CHECK_PASS SPF reports sender host as permitted sender for sender-domain 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (edmund.edgar[at]gmail.com) -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [209.85.192.177 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 1.0 HTML_MESSAGE BODY: HTML included in message 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature X-Headers-End: 1WMBAJ-0005Bk-WC Subject: Re: [Bitcoin-development] Is this a safe thing to be doing with ECC addition? (Oracle protocol) X-BeenThere: bitcoin-development@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 08 Mar 2014 06:55:25 -0000 --047d7b10cae57005af04f412dae3 Content-Type: text/plain; charset=UTF-8 On 4 March 2014 14:07, Odinn Cyberguerrilla wrote: > Nothing is safe. > This is true. To rephrase, imagine I gave you an ECC public key , you gave me back a public key of your own devising, then I paid some money to the address resulting from add_pubkeys(,) [1]. Can anyone either: a) Think of a way that Odinn could make an such that they could spend the resulting money without having . b) Opine, somewhat knowledgeably, that this probably wouldn't be an easy thing to do, and they wouldn't be alarmed to see people running software that did this kind of thing. [1] https://github.com/vbuterin/pybitcointools/blob/master/pybitcointools/main.py#L173 -- Edmund Edgar Founder, Social Minds Inc (KK) Twitter: @edmundedgar Linked In: edmundedgar Skype: edmundedgar http://www.socialminds.jp Reality Keys @realitykeys ed@realitykeys.com https://www.realitykeys.com --047d7b10cae57005af04f412dae3 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
On 4= March 2014 14:07, Odinn Cyberguerrilla <odinn.cyberguerrill= a@riseup.net> wrote:
Nothing is safe.

This = is true. To rephrase, imagine I gave you an ECC public key <ed_pub>, = you gave me back a public key <odinn_pub> of your own devising, then = I paid some money to the address resulting from add_pubkeys(<ed_pub>,= <odinn_pub>) [1]. Can anyone either:

a) Think of a way that Odinn could make an <odinn_pu= b> such that they could spend the resulting money without having <ed_= priv>.
b) Opine, somewhat knowledgeably, that this probably wo= uldn't be an easy thing to do, and they wouldn't be alarmed to see = people running software that did this kind of thing.


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