From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sog-mx-3.v43.ch3.sourceforge.com ([172.29.43.193] helo=mx.sourceforge.net) by sfs-ml-1.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1YILDD-0005XB-Gp for bitcoin-development@lists.sourceforge.net; Mon, 02 Feb 2015 17:55:03 +0000 Received-SPF: pass (sog-mx-3.v43.ch3.sourceforge.com: domain of gmail.com designates 209.85.216.43 as permitted sender) client-ip=209.85.216.43; envelope-from=martin.habovstiak@gmail.com; helo=mail-qa0-f43.google.com; Received: from mail-qa0-f43.google.com ([209.85.216.43]) by sog-mx-3.v43.ch3.sourceforge.com with esmtps (TLSv1:RC4-SHA:128) (Exim 4.76) id 1YILDB-0005GI-Ds for bitcoin-development@lists.sourceforge.net; Mon, 02 Feb 2015 17:55:03 +0000 Received: by mail-qa0-f43.google.com with SMTP id v10so30216842qac.2 for ; Mon, 02 Feb 2015 09:54:56 -0800 (PST) MIME-Version: 1.0 X-Received: by 10.140.39.179 with SMTP id v48mr24191052qgv.77.1422899695961; Mon, 02 Feb 2015 09:54:55 -0800 (PST) Received: by 10.140.19.18 with HTTP; Mon, 2 Feb 2015 09:54:55 -0800 (PST) In-Reply-To: <68C03646-02E7-43C6-9B73-E4697F3AA5FD@gmail.com> References: <27395C55-CF59-4E65-83CA-73F903272C5F@gmail.com> <54CE3816.6020505@bitwatch.co> <68C03646-02E7-43C6-9B73-E4697F3AA5FD@gmail.com> Date: Mon, 2 Feb 2015 18:54:55 +0100 Message-ID: From: =?UTF-8?Q?Martin_Habov=C5=A1tiak?= To: Brian Erdelyi Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Spam-Score: -1.6 (-) 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 (martin.habovstiak[at]gmail.com) -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 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: 1YILDB-0005GI-Ds Cc: Bitcoin Dev Subject: Re: [Bitcoin-development] Proposal to address Bitcoin malware 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: Mon, 02 Feb 2015 17:55:03 -0000 Good idea. I think this could be even better: instead of using third party, send partially signed TX from computer to smartphone. In case, you are paranoid, make 3oo5 address made of two cold storage keys, one on desktop/laptop, one on smartphone, one using third party. If it isn't enough, add requirement of another four keys, so you have three desktops with different OS (Linux, Windows, Mac) and three mobile OS (Android, iOS, Windows Phone), third party and some keys in cold storage. Also, I forgot HW wallets, so at least Trezor and Ledger. I believe this scheme is unpenetrable by anyone, including NSA, FBI, CIA, NBU... Jokes aside, I think leaving out third party is important for privacy reaso= ns. Stay safe! 2015-02-02 18:40 GMT+01:00 Brian Erdelyi : > Another concept... > > It should be possible to use multisig wallets to protect against malware.= For example, a user could generate a wallet with 3 keys and require a tra= nsaction that has been signed by 2 of those keys. One key is placed in col= d storage and anther sent to a third-party. > > It is now possible to generate and sign transactions on the users compute= r and send this signed transaction to the third-party for the second signat= ure. This now permits the use of out of band transaction verification tech= niques before the third party signs the transaction and sends to the blockc= hain. > > If the third-party is malicious or becomes compromised they would not hav= e the ability to complete transactions as they only have one private key. = If the third-party disappeared, the user could use the key in cold storage = to sign transactions and send funds to a new wallet. > > Thoughts? > -------------------------------------------------------------------------= ----- > Dive into the World of Parallel Programming. The Go Parallel Website, > sponsored by Intel and developed in partnership with Slashdot Media, is y= our > hub for all things parallel software development, from weekly thought > leadership blogs to news, videos, case studies, tutorials and more. Take = a > look and join the conversation now. http://goparallel.sourceforge.net/ > _______________________________________________ > Bitcoin-development mailing list > Bitcoin-development@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/bitcoin-development