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-1.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1YILwp-000890-MI for bitcoin-development@lists.sourceforge.net; Mon, 02 Feb 2015 18:42:11 +0000 X-ACL-Warn: Received: from mail-pa0-f50.google.com ([209.85.220.50]) by sog-mx-1.v43.ch3.sourceforge.com with esmtps (TLSv1:RC4-SHA:128) (Exim 4.76) id 1YILwo-0000sS-Hl for bitcoin-development@lists.sourceforge.net; Mon, 02 Feb 2015 18:42:11 +0000 Received: by mail-pa0-f50.google.com with SMTP id rd3so85512090pab.9 for ; Mon, 02 Feb 2015 10:42:04 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:references:mime-version:in-reply-to:content-type :content-transfer-encoding:message-id:cc:from:subject:date:to; bh=Fs10Tu9Un19RNRXLpr8jai5lEGRY2P0eIJkm4955TxQ=; b=ZxtVkc5nVQDIQC2R4yFFzIpqvvFU/eNelYkm1vgUGB7VImIpxhyOg7pSWI56Nm5zCX uDc5rEYbWehX13ygQKGi9RIFTGzS9KHhOQ9l0HtXAVjKxmmcOyijkDFVt1wbs7EVyk6i RC7uVOI+5nHjTSDSHGVewZdV6JiMja/MmT3akJpUZuZdqNPk/c0ln2Aay5tUaevr+FkF 46OQxo2bugaf3E8KZJymxGAVRjbxuf6K9qRnpTCR8L20pHm0mxobVZLf1+5tRKSV/7ef 0d8XERv86E/dLac01236wChnHheyiy6Wp+yDDgaxs103dwf+K+9/QYkGwjSqnOVQN6dh KFJg== X-Gm-Message-State: ALoCoQlaUXccnPOhGuo6qb7O/MCNDys84XffWQx8Nei9gvg/+tMieQP1JZaj+C9S9OBBPhyJhNup X-Received: by 10.68.189.71 with SMTP id gg7mr728416pbc.21.1422900704579; Mon, 02 Feb 2015 10:11:44 -0800 (PST) Received: from [10.125.42.145] (mobile-166-171-121-213.mycingular.net. [166.171.121.213]) by mx.google.com with ESMTPSA id ox2sm19508025pdb.21.2015.02.02.10.11.43 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 02 Feb 2015 10:11:44 -0800 (PST) References: <27395C55-CF59-4E65-83CA-73F903272C5F@gmail.com> <54CE3816.6020505@bitwatch.co> <68C03646-02E7-43C6-9B73-E4697F3AA5FD@gmail.com> Mime-Version: 1.0 (1.0) In-Reply-To: <68C03646-02E7-43C6-9B73-E4697F3AA5FD@gmail.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Message-Id: <05590A33-1802-4C15-91C0-8777ACD8440B@voskuil.org> X-Mailer: iPhone Mail (12B440) From: Eric Voskuil Date: Mon, 2 Feb 2015 11:05:57 -0700 To: Brian Erdelyi X-Spam-Score: 0.0 (/) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. X-Headers-End: 1YILwo-0000sS-Hl 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 18:42:11 -0000 In sending the first-signed transaction to another for second signature, how= does the first signer authenticate to the second without compromising the i= ndependence of the two factors? Sent from my iPhone > On Feb 2, 2015, at 10:40 AM, Brian Erdelyi wrote= : >=20 > Another concept... >=20 > 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 trans= action that has been signed by 2 of those keys. One key is placed in cold s= torage and anther sent to a third-party. >=20 > It is now possible to generate and sign transactions on the users computer= and send this signed transaction to the third-party for the second signatur= e. This now permits the use of out of band transaction verification techniq= ues before the third party signs the transaction and sends to the blockchain= . >=20 > If the third-party is malicious or becomes compromised they would not have= 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 s= ign transactions and send funds to a new wallet. >=20 > Thoughts? > --------------------------------------------------------------------------= ---- > Dive into the World of Parallel Programming. The Go Parallel Website, > sponsored by Intel and developed in partnership with Slashdot Media, is yo= ur > 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