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-3.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1XFNar-0002bz-DA for bitcoin-development@lists.sourceforge.net; Thu, 07 Aug 2014 13:18:57 +0000 X-ACL-Warn: Received: from smtprelay03.ispgateway.de ([80.67.31.26]) by sog-mx-1.v43.ch3.sourceforge.com with esmtps (TLSv1:AES256-SHA:256) (Exim 4.76) id 1XFNap-0002HG-Pi for bitcoin-development@lists.sourceforge.net; Thu, 07 Aug 2014 13:18:57 +0000 Received: from [89.13.171.157] (helo=anonymous) by smtprelay03.ispgateway.de with esmtpsa (TLSv1:AES256-SHA:256) (Exim 4.68) (envelope-from ) id 1XFNIq-0002G4-Ck; Thu, 07 Aug 2014 15:00:20 +0200 From: xor To: bitcoin-development@lists.sourceforge.net Date: Thu, 07 Aug 2014 15:00:11 +0200 Message-ID: <1530801.palqu9XdN4@1337h4x0r> Organization: Freenet Project User-Agent: KMail/4.13.2 (Linux/3.13.0-32-generic; KDE/4.13.2; x86_64; ; ) In-Reply-To: <8137823.B0x87S28xY@calzone> References: <8137823.B0x87S28xY@calzone> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart20408252.l0l1QHbILQ"; micalg="pgp-sha256"; protocol="application/pgp-signature" X-Df-Sender: eG9yQGZyZWVtYWlsLmJvZ2VydC5kZQ== X-Spam-Score: 1.0 (+) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [80.67.31.26 listed in list.dnswl.org] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record 1.0 SPF_SOFTFAIL SPF: sender does not match SPF record (softfail) X-Headers-End: 1XFNap-0002HG-Pi Subject: Re: [Bitcoin-development] CoinShuffle: decentralized CoinJoin without trusted third parties X-BeenThere: bitcoin-development@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list Reply-To: xor@freenetproject.org List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Aug 2014 13:18:57 -0000 --nextPart20408252.l0l1QHbILQ Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="us-ascii" On Thursday, August 07, 2014 12:22:31 AM Tim Ruffing wrote: > - Decentralization / no third party: > There is no (trusted or untrusted) third party in a run of the protoc= ol. > (Still, as in all mixing solutions, users need some way to gather tog= ether > before they can run the protocol. This can be done via a P2P protocol= if a > decentralized solution is desired also for this step.) [...] > http://crypsys.mmci.uni-saarland.de/projects/CoinShuffle/ for a techn= ical > overview.=20 I think the description at your website leaves out the truly interestin= g part: How do you decentralize this securely? =2D How do Alice, Bob, Charlie and Dave communicate, i.e. which network i= s used=20 for communication and how? =2D How does Alice know that Bob, Charlie and Dave are not the same perso= n? (=3D how do you prevent a Sybil attack?) Because thats the real problem with mixing it seems - ensuring that you= r=20 mixing partners are actually 100 people and not just 1 attacker. There = are=20 probably many mixing algorithms which work if you solve that problem, b= ut I=20 don't see how you offer a solution for it :( --nextPart20408252.l0l1QHbILQ Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part. Content-Transfer-Encoding: 7Bit -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iQIcBAABCAAGBQJT43hhAAoJEMtmZ+8tjWt53aAP/068oZ1yLxjv34+sg2OumY94 y5F4SaNZ4mO9N4Z7NT1Ef0TTgn/XTA3wg02xsedGQH4Cq5P5/SnRwfeNoPJZLsyD Sg+9iYeuosxXxTpHJrEhVY9x0RH3hmQf5KHc3kgmC339SlCQZm/53yOemE7H89d9 gnkxfd5ig7a3z5+kerDrpPbqrcgR6o+3Gp7rca7CUalL6A4r50OysNKDMqMQy6xl eiaBBBZhLZfooLFzBN5Zzdo2I9eUCmiaw/YR/ChaujH05kNAeXMpjGb6cLS7eIhw 1HWpp9MMZknFZtP7BckGtqwZA2DykhN4sWT2BEmVkx4mtylNBdIK0+POF5So4ZOH PGQlHjmUfa25G6s+ZcK7j9kF7HK7ThwTrZJLpVliF/+B7jQx13M79cceOgRfBIU3 LU0Vl0Ta1H4lqUd4kybEAcQxF+eDsW8yKYvUP/mVsTkodfjsSJ4lO3/lTeF/1/71 PuNe9FEQ1prHVd0kDLrYOQjkW1/skGBKdGDpUvRZPWNsW2ZfVzf4UlGVxhK5R/hc RiR2tu1ikkJdrKbJu3r3YpM5gC4Df1mlXs4JWWwJrk5iJZPpSvoV0BC8lPA6YR8G XP4dIEMDq2VZvi2JQjCd1lASJrkPvbmwgqvJnVTiaECTV/wMtXF2EaZxWCULnW/C XzdreizsP4+Ip/8AJuTL =5oUV -----END PGP SIGNATURE----- --nextPart20408252.l0l1QHbILQ--