From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sog-mx-4.v43.ch3.sourceforge.com ([172.29.43.194] helo=mx.sourceforge.net) by sfs-ml-4.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1WsxZ2-0007En-1J for bitcoin-development@lists.sourceforge.net; Fri, 06 Jun 2014 17:04:24 +0000 Received-SPF: pass (sog-mx-4.v43.ch3.sourceforge.com: domain of petertodd.org designates 62.13.148.102 as permitted sender) client-ip=62.13.148.102; envelope-from=pete@petertodd.org; helo=outmail148102.authsmtp.net; Received: from outmail148102.authsmtp.net ([62.13.148.102]) by sog-mx-4.v43.ch3.sourceforge.com with esmtp (Exim 4.76) id 1WsxZ0-0004kZ-50 for bitcoin-development@lists.sourceforge.net; Fri, 06 Jun 2014 17:04:24 +0000 Received: from mail-c237.authsmtp.com (mail-c237.authsmtp.com [62.13.128.237]) by punt14.authsmtp.com (8.14.2/8.14.2) with ESMTP id s56H4BGc040048; Fri, 6 Jun 2014 18:04:11 +0100 (BST) Received: from savin (76-10-178-109.dsl.teksavvy.com [76.10.178.109]) (authenticated bits=128) by mail.authsmtp.com (8.14.2/8.14.2/) with ESMTP id s56H3v2o080757 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=NO); Fri, 6 Jun 2014 18:04:00 +0100 (BST) Date: Fri, 6 Jun 2014 13:05:24 -0400 From: Peter Todd To: Gregory Maxwell Message-ID: <20140606170524.GA29195@savin> References: <20140606081933.GA29458@savin> <20140606084852.GA30247@netbook.cypherspace.org> <20140606090441.GA19256@savin> <20140606104543.GA31085@netbook.cypherspace.org> <20140606164639.GB14891@savin> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="x+6KMIRAuhnl3hBn" Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) X-Server-Quench: 8e301c13-ed9c-11e3-9f74-002590a135d3 X-AuthReport-Spam: If SPAM / abuse - report it at: http://www.authsmtp.com/abuse X-AuthRoute: OCd2Yg0TA1ZNQRgX IjsJECJaVQIpKltL GxAVKBZePFsRUQkR aQdMdgQUEkAaAgsB AmIbWlxeUFl7WWM7 bAxPbAVDY01GQQRq WVdMSlVNFUsrBBp5 BVgcDRl6dwJDfzBx Z0drWD5TCUd6dBV8 QVMBQWRVeGZhPWMC WRZfcx5UcAFPdx8U a1N6AHBDAzANdhES HhM4ODE3eDlSNilR RRkIIFQOdA4hGjk7 QlgIFDQzdQAA X-Authentic-SMTP: 61633532353630.1024:706 X-AuthFastPath: 0 (Was 255) X-AuthSMTP-Origin: 76.10.178.109/587 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: 1WsxZ0-0004kZ-50 Cc: Bitcoin Development Subject: Re: [Bitcoin-development] Bloom bait 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: Fri, 06 Jun 2014 17:04:24 -0000 --x+6KMIRAuhnl3hBn Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Jun 06, 2014 at 09:58:19AM -0700, Gregory Maxwell wrote: > On Fri, Jun 6, 2014 at 9:46 AM, Peter Todd wrote: > > transactions against. Where they differ is that bloom filters has O(n) > > scaling, where n is the size of a block, and prefix filters have O(log = n) > > scaling with slightly(1) higher k. Again, if you *don't* use brute forc= ing > > in conjunction with prefixes they have no different transactional graph > > privacy than bloom filters, >=20 > Huh? How are you thinking that something that gets put in transactions > and burned forever into the blockchain that lets you (statically) link > txout ownership is "no different" from something which is shared > directly with a couple peers, potentially peers you trust and which > are run by yourself or your organization? Again, you *don't* have to use brute-force prefix selection. You can just as easily give your peer multiple prefixes, each of which corresponds at least one address in your wallet with some false positive rate. I explained all this in detail in my original blockchain data privacy writeup months ago. --=20 'peter'[:-1]@petertodd.org 000000000000000029d945c3832c7f4afabce11e6cb1c27b6f5e8c0f2bbb356c --x+6KMIRAuhnl3hBn Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.14 (GNU/Linux) iQGrBAEBCACVBQJTkfTPXhSAAAAAABUAQGJsb2NraGFzaEBiaXRjb2luLm9yZzAw MDAwMDAwMDAwMDAwMDAyOWQ5NDVjMzgzMmM3ZjRhZmFiY2UxMWU2Y2IxYzI3YjZm NWU4YzBmMmJiYjM1NmMvFIAAAAAAFQARcGthLWFkZHJlc3NAZ251cGcub3JncGV0 ZUBwZXRlcnRvZC5vcmcACgkQJIFAPaXwkfufQwf/eEB+hgnjoIJ6oY8V3Or3xi1o vGI9wyMr7I9Dy6rTFD3ckPtg8R88Dkpg4n0fHefa6z/jDYAMa03FsF6HcDcjqqDR HP0LVF5j0/fjTe7+SZloXPHkcloFXjd8xDMDqxV/5rS8NuNq2wbGv5RG2lUSd08w pqdaK+8Z4a7SexM7xvuMczChGqGtqbDa6eIbg8Ft6ODhIiEgEem3JwhK3Q5OxtG4 TJ3yrEAkjIsA+PYGdu1I7U9a/c47atP0Wxpg7xK6reFLL9lqSfgbFZQgUxPWGCeM k0S7zFx2zRIXSn4J7RT8sVyiZUI5+nYrJezpDgl/5cA6WGaCqPLtWXgPWMjR+A== =xgp5 -----END PGP SIGNATURE----- --x+6KMIRAuhnl3hBn--