From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 84DA8724 for ; Fri, 24 Jul 2015 03:42:10 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from mout.gmx.net (mout.gmx.net [212.227.15.19]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id C6FF017B for ; Fri, 24 Jul 2015 03:42:09 +0000 (UTC) Received: from [46.101.177.144] by 3capp-mailcom-bs10.server.lan (via HTTP); Fri, 24 Jul 2015 05:42:07 +0200 MIME-Version: 1.0 Message-ID: From: "Slurms MacKenzie" To: bitcoin-dev@lists.linuxfoundation.org Content-Type: text/plain; charset=UTF-8 Date: Fri, 24 Jul 2015 05:42:07 +0200 Importance: normal Sensitivity: Normal In-Reply-To: <55B1A254.6070806@voskuil.org> References: <55AFBBE6.3060702@electrum.org> <1437606706.2688.0.camel@yahoo.com> <114b2a76-ebc7-461a-b4bc-10873574d6c4@HUB2.rwth-ad.de> , <55B1A254.6070806@voskuil.org> X-UI-Message-Type: mail X-Priority: 3 X-Provags-ID: V03:K0:jGaZC/mQ8LuNf7O8FUW/U2noKiv5zjzdVWVStf6j8h/ 2H0ifQpEL/usM0U6Th8KLoSeMlOTJrgNZDA6UfaRarmp1/P3Jg NBkNfnoED34KodmWcfqnYum/CC5WfLq5/i2NCtx999uPwBlqdc f3zYSBJ2iAH2pmf5xHxWI1iJ0IHbA3AN23CGPACmfiphqgljB8 5dbVVf5509Ht6WsM60axMuRH4frOBesb0zlswkcc8bY99DO1wl od4REXXAiE/WGrgoxq4WV/MIVZ3EL3UXSqeOt39PuVzjCB4obW TyypTk6XrVmphblGegPbxYnxnX5 X-UI-Out-Filterresults: notjunk:1;V01:K0:nHvBDOfVixc=:bTvrzpb+IaPycQ6W/j6H6a aVnPwoN8Xf2yXO724uuW2Z0YFWjGGJha5ForFdm+9nxCNqZN/c+F8KUHtCsP+BOwtkp9JHDIo oofmPgdwpANr3P9I1B+IUH6OW0bAPZ93pURyR4GwkAhp0lwzcReLDV44UnpCR5QSA6lujGluA fa1/mNkvB8/zkChYGHTMwDs0Lef29QsYn62g+zum4HAJOXuPVDp0jtd+s6lTmgTFJGCtuc7Ol jgKljI/QEXnRrkKgZIotJI7c3vc5+nlpojVjPm7m5aWeqh/IVS7zFlcXKPSgT6cLDYiQk3IbM hvivtKljW1BUj3A56kPeZNI6/ZerY8c07nHBeMkiSP/5HEmXMn2crZ1Mal9qA/h6npy/QKew1 FPmeCy+hVSfd8imC/TMYMxyXxueKuEwnP9YmuJd4OTx/WWSSncjTPzKfMIw8rbYRprWtN7Ocp ppPkEEDa0w== X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on smtp1.linux-foundation.org Subject: Re: [bitcoin-dev] Making Electrum more anonymous X-BeenThere: bitcoin-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Bitcoin Development Discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 24 Jul 2015 03:42:10 -0000 Keep in mind this is the similar premise as claimed to be offered by BIP37 bloom filters, but faulty assumptions and implementation failure in BitcoinJ have meant that bloom filters uniquely identify the wallet and offer no privacy for the user no matter what the settings are. If you imagine a system where there is somehow complete separation and anonymization between all requests and subscriptions, the timing still leaks the association between the addresses to the listeners. The obvious solution to that is to use a very high latency mix network, but I somehow doubt that there's any desire for a wallet with SPV security that takes a week to return results. > Sent: Friday, July 24, 2015 at 4:26 AM > From: "Eric Voskuil via bitcoin-dev" > To: "Stefan Richter" , gb , "Thomas Voegtlin" > Cc: bitcoin-dev@lists.linuxfoundation.org > Subject: Re: [bitcoin-dev] Making Electrum more anonymous > > > From our perspective, another important objective of query privacy is > allowing the caller make the trade-off between the relative levels of > privacy and performance - from absolute to non-existent. In some cases > privacy is neither required nor desired. > > Prefix filtering accomplishes the client-tuning objective. It also does > not suffer server collusion attacks nor is it dependent on computational > bounds. The primary trade-off becomes result set (download) size against > privacy. >