diff options
| author | Peter Todd <pete@petertodd.org> | 2015-02-05 17:17:26 -0800 |
|---|---|---|
| committer | bitcoindev <bitcoindev@gnusha.org> | 2015-02-06 01:17:50 +0000 |
| commit | 33eb631fc5c7d89db0114b6804c20f95fb412cf6 (patch) | |
| tree | a23c9f11a2c39703d863400a6a1cae69b6807340 | |
| parent | 5919ebaef315b75a4a4d1cbd479e785e88f14d2d (diff) | |
| download | pi-bitcoindev-33eb631fc5c7d89db0114b6804c20f95fb412cf6.tar.gz pi-bitcoindev-33eb631fc5c7d89db0114b6804c20f95fb412cf6.zip | |
Re: [Bitcoin-development] determining change addresses using the least significant digits
| -rw-r--r-- | 58/dcaa31131e603bcaa77a8b31877e73a7b94531 | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/58/dcaa31131e603bcaa77a8b31877e73a7b94531 b/58/dcaa31131e603bcaa77a8b31877e73a7b94531 new file mode 100644 index 000000000..5c81fba36 --- /dev/null +++ b/58/dcaa31131e603bcaa77a8b31877e73a7b94531 @@ -0,0 +1,124 @@ +Received: from sog-mx-4.v43.ch3.sourceforge.com ([172.29.43.194] + helo=mx.sourceforge.net) + by sfs-ml-1.v29.ch3.sourceforge.com with esmtp (Exim 4.76) + (envelope-from <pete@petertodd.org>) id 1YJXYM-0000BD-Ux + for bitcoin-development@lists.sourceforge.net; + Fri, 06 Feb 2015 01:17:50 +0000 +Received-SPF: pass (sog-mx-4.v43.ch3.sourceforge.com: domain of petertodd.org + designates 62.13.149.58 as permitted sender) + client-ip=62.13.149.58; envelope-from=pete@petertodd.org; + helo=outmail149058.authsmtp.co.uk; +Received: from outmail149058.authsmtp.co.uk ([62.13.149.58]) + by sog-mx-4.v43.ch3.sourceforge.com with esmtp (Exim 4.76) + id 1YJXYL-0002tE-Ob for bitcoin-development@lists.sourceforge.net; + Fri, 06 Feb 2015 01:17:50 +0000 +Received: from mail-c235.authsmtp.com (mail-c235.authsmtp.com [62.13.128.235]) + by punt16.authsmtp.com (8.14.2/8.14.2/) with ESMTP id t161HhwA092592; + Fri, 6 Feb 2015 01:17:43 GMT +Received: from muck (99-121-56-190.lightspeed.sntcca.sbcglobal.net + [99.121.56.190]) (authenticated bits=128) + by mail.authsmtp.com (8.14.2/8.14.2/) with ESMTP id t161HSAa078684 + (version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=NO); + Fri, 6 Feb 2015 01:17:38 GMT +Date: Thu, 5 Feb 2015 17:17:26 -0800 +From: Peter Todd <pete@petertodd.org> +To: Isidor Zeuner <cryptocurrencies@quidecco.de> +Message-ID: <20150206011726.GJ32226@muck> +References: <20150204142323.DEC4BE2DCDE@quidecco.de> +MIME-Version: 1.0 +Content-Type: multipart/signed; micalg=pgp-sha256; + protocol="application/pgp-signature"; boundary="lqaZmxkhekPBfBzr" +Content-Disposition: inline +In-Reply-To: <20150204142323.DEC4BE2DCDE@quidecco.de> +X-Server-Quench: f33770af-ad9d-11e4-b396-002590a15da7 +X-AuthReport-Spam: If SPAM / abuse - report it at: + http://www.authsmtp.com/abuse +X-AuthRoute: OCd2Yg0TA1ZNQRgX IjsJECJaVQIpKltL GxAVKBZePFsRUQkR + aAdMdgQUHlAWAgsB AmMbW1VeUVp7XWE7 YgNPbAdcfE9IQQRj + UFdMSlVNFUssABoA fn1vAxl1fwNOfDB3 bUBrECZYX0N9dRcr + Xx8AHDkbZGY1bH1N U0leagNUcgZDfk5E bwQuUz1vNG8XDQg5 + AwQ0PjZ0MThBJSBS WgQAK04nCUoGAjMm QhEEHDMgVUYFTiM8 + IlQvJlIGEV0KP156 LEAgX11QLx8faEVa EkhWHGdCJlYHRiQq + BgpcQQYSETJcXTw0 +X-Authentic-SMTP: 61633532353630.1023:706 +X-AuthFastPath: 0 (Was 255) +X-AuthSMTP-Origin: 99.121.56.190/587 +X-AuthVirus-Status: No virus detected - but ensure you scan with your own + anti-virus system. +X-Spam-Score: -1.5 (-) +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 SPF_PASS SPF: sender matches SPF record +X-Headers-End: 1YJXYL-0002tE-Ob +Cc: Bitcoin Development <bitcoin-development@lists.sourceforge.net> +Subject: Re: [Bitcoin-development] determining change addresses using the + least significant digits +X-BeenThere: bitcoin-development@lists.sourceforge.net +X-Mailman-Version: 2.1.9 +Precedence: list +List-Id: <bitcoin-development.lists.sourceforge.net> +List-Unsubscribe: <https://lists.sourceforge.net/lists/listinfo/bitcoin-development>, + <mailto:bitcoin-development-request@lists.sourceforge.net?subject=unsubscribe> +List-Archive: <http://sourceforge.net/mailarchive/forum.php?forum_name=bitcoin-development> +List-Post: <mailto:bitcoin-development@lists.sourceforge.net> +List-Help: <mailto:bitcoin-development-request@lists.sourceforge.net?subject=help> +List-Subscribe: <https://lists.sourceforge.net/lists/listinfo/bitcoin-development>, + <mailto:bitcoin-development-request@lists.sourceforge.net?subject=subscribe> +X-List-Received-Date: Fri, 06 Feb 2015 01:17:51 -0000 + + +--lqaZmxkhekPBfBzr +Content-Type: text/plain; charset=us-ascii +Content-Disposition: inline +Content-Transfer-Encoding: quoted-printable + +On Wed, Feb 04, 2015 at 03:23:23PM +0100, Isidor Zeuner wrote: +> Hi there, +>=20 +> traditionally, the Bitcoin client strives to hide which output +> addresses are change addresses going back to the payer. However, +> especially with today's dynamically calculated miner fees, this +> may often be ineffective: +>=20 +> A user sending a payment using the Bitcoin client will usually enter +> the payment amount only up to the number of digits which are +> considered to be significant enough. So, the least significant digits +> will often be zero for the payment. With dynamically calculated miner +> fees, this will often not be the case for the change amount, making it +> easy for an observer to classify the output addresses. +>=20 +> A possible approach to handle this issue would be to add a randomized +> offset amount to the payment amount. This offset amount can be small +> in comparison to the payment amount. +>=20 +> Any thoughts? + +Have you looked at Armory? IIRC they do this kind of stuff. + +--=20 +'peter'[:-1]@petertodd.org +0000000000000000165ecbd638ec09226f84c34d3d775d34ca5df4abfa8cb57c + +--lqaZmxkhekPBfBzr +Content-Type: application/pgp-signature; name="signature.asc" +Content-Description: Digital signature + +-----BEGIN PGP SIGNATURE----- + +iQGrBAEBCACVBQJU1BYiXhSAAAAAABUAQGJsb2NraGFzaEBiaXRjb2luLm9yZzAw +MDAwMDAwMDAwMDAwMDAxNjVlY2JkNjM4ZWMwOTIyNmY4NGMzNGQzZDc3NWQzNGNh +NWRmNGFiZmE4Y2I1N2MvFIAAAAAAFQARcGthLWFkZHJlc3NAZ251cGcub3JncGV0 +ZUBwZXRlcnRvZC5vcmcACgkQJIFAPaXwkfs4xQf6A/0e97srNMB/R6jQNDOPchV8 +mCK+yqIVou60QGyklxkXUN1EW/b60pyd8KwFnWcnvVkNacGseMu5xoel9ZmqAyel +sV8nZf3e0dhZdbhG/nij36z3DqbbmHREYSNl6p42d4uJ/TFCuTfYkLUiz2a9AgE3 +GwVlhedyIIhoQN+aEu2Vqdv9Z/pNMSrIKv1rTN1OtC2DRQ0JybguUCLxwEqE+YoW +8qBoaywjnWcJ4d4bpU8wbFRkbyB+XfXfd7jRpr0/2rP78N3TLFVRiKUAD0yqdOKT +iBYaBlS1jXyzYPvyqTQmLCjMBCbhuXLembtF50yxoQH1lrKHiz4dZAp4RjGajQ== +=GwFK +-----END PGP SIGNATURE----- + +--lqaZmxkhekPBfBzr-- + + |