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| author | Mike Hearn <mike@plan99.net> | 2014-08-18 19:27:18 +0200 |
|---|---|---|
| committer | bitcoindev <bitcoindev@gnusha.org> | 2014-08-18 17:27:24 +0000 |
| commit | 6a1f50ede05277834f71fb69fa7e4a336ba5da97 (patch) | |
| tree | f897760571f1b3bf91e7708c09ce503d0c2e4d9e | |
| parent | 965fd7a9e36f375fed2f64c4df957fd7d13aff66 (diff) | |
| download | pi-bitcoindev-6a1f50ede05277834f71fb69fa7e4a336ba5da97.tar.gz pi-bitcoindev-6a1f50ede05277834f71fb69fa7e4a336ba5da97.zip | |
Re: [Bitcoin-development] Outbound connections rotation
| -rw-r--r-- | 69/af5c63c7d977e4e1aa1aa4cc451b70186a3074 | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/69/af5c63c7d977e4e1aa1aa4cc451b70186a3074 b/69/af5c63c7d977e4e1aa1aa4cc451b70186a3074 new file mode 100644 index 000000000..b72223000 --- /dev/null +++ b/69/af5c63c7d977e4e1aa1aa4cc451b70186a3074 @@ -0,0 +1,116 @@ +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 <mh.in.england@gmail.com>) id 1XJQiK-0000RO-MM + for bitcoin-development@lists.sourceforge.net; + Mon, 18 Aug 2014 17:27:24 +0000 +Received-SPF: pass (sog-mx-4.v43.ch3.sourceforge.com: domain of gmail.com + designates 209.85.219.48 as permitted sender) + client-ip=209.85.219.48; envelope-from=mh.in.england@gmail.com; + helo=mail-oa0-f48.google.com; +Received: from mail-oa0-f48.google.com ([209.85.219.48]) + by sog-mx-4.v43.ch3.sourceforge.com with esmtps (TLSv1:RC4-SHA:128) + (Exim 4.76) id 1XJQiJ-0007Th-PE + for bitcoin-development@lists.sourceforge.net; + Mon, 18 Aug 2014 17:27:24 +0000 +Received: by mail-oa0-f48.google.com with SMTP id m1so4236811oag.7 + for <bitcoin-development@lists.sourceforge.net>; + Mon, 18 Aug 2014 10:27:18 -0700 (PDT) +MIME-Version: 1.0 +X-Received: by 10.182.224.227 with SMTP id rf3mr4758408obc.70.1408382838297; + Mon, 18 Aug 2014 10:27:18 -0700 (PDT) +Sender: mh.in.england@gmail.com +Received: by 10.76.97.132 with HTTP; Mon, 18 Aug 2014 10:27:18 -0700 (PDT) +In-Reply-To: <CAAS2fgQZaDOtoh+_oaiZh6jMOacSuHbEM=vktBdThDP_7eRH0Q@mail.gmail.com> +References: <20140818164543.GB31175@localhost.localdomain> + <CAAS2fgQZaDOtoh+_oaiZh6jMOacSuHbEM=vktBdThDP_7eRH0Q@mail.gmail.com> +Date: Mon, 18 Aug 2014 19:27:18 +0200 +X-Google-Sender-Auth: lMBtC7mCj7UfrK2D7EJjKwonkVU +Message-ID: <CANEZrP07ec+Bp3yvhB=QRt_gRTJ=dWPgZiMpzzeiBNki02O3aA@mail.gmail.com> +From: Mike Hearn <mike@plan99.net> +To: Gregory Maxwell <gmaxwell@gmail.com> +Content-Type: multipart/alternative; boundary=089e013a05dec9515a0500eaae63 +X-Spam-Score: -0.5 (/) +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 FREEMAIL_FROM Sender email is commonly abused enduser mail provider + (mh.in.england[at]gmail.com) + -0.0 SPF_PASS SPF: sender matches SPF record + 1.0 HTML_MESSAGE BODY: HTML included in message + 0.1 DKIM_SIGNED Message has a DKIM or DK signature, + not necessarily valid + -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature +X-Headers-End: 1XJQiJ-0007Th-PE +Cc: Ivan Pustogarov <ivan.pustogarov@uni.lu>, + Bitcoin Development <bitcoin-development@lists.sourceforge.net> +Subject: Re: [Bitcoin-development] Outbound connections rotation +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: Mon, 18 Aug 2014 17:27:24 -0000 + +--089e013a05dec9515a0500eaae63 +Content-Type: text/plain; charset=UTF-8 + +> +> Connection rotation would be fine for improving a node's knoweldge +> about available peers and making the network stronger against +> partitioning. +> + +It's also the first/next step towards decentralising the DNS seeds (for SPV +clients), as it'd allow each node to explore the network and return better +quality results in getaddr. + + +> If you rotate where you send out your transactions then with +> very high probability a sybil pretending to be many nodes will observe +> you transmitting directly. +> + +This is sort of what Tor is going through with their guard nodes and how +often to rotate them. + +I think the attack Ivan is talking about does not require sybil attacks to +work though, just listening to lots of peers. Raising the bar to require +the attacker to receive lots of connections seems like a win. + +--089e013a05dec9515a0500eaae63 +Content-Type: text/html; charset=UTF-8 +Content-Transfer-Encoding: quoted-printable + +<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote"><blo= +ckquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #c= +cc solid;padding-left:1ex">Connection rotation would be fine for improving = +a node's knoweldge<br> + +about available peers and making the network stronger against<br> +partitioning.<br></blockquote><div><br></div><div>It's also the first/n= +ext step towards decentralising the DNS seeds (for SPV clients), as it'= +d allow each node to explore the network and return better quality results = +in getaddr.</div> +<div>=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8= +ex;border-left:1px #ccc solid;padding-left:1ex">If you rotate where you sen= +d out your transactions then with<br> +very high probability a sybil pretending to be many nodes will observe<br> +you transmitting directly.<br></blockquote><div><br></div><div>This is sort= + of what Tor is going through with their guard nodes and how often to rotat= +e them.</div><div><br></div><div>I think the attack Ivan is talking about d= +oes not require sybil attacks to work though, just listening to lots of pee= +rs. Raising the bar to require the attacker to receive lots of connections = +seems like a win.</div> +</div></div></div> + +--089e013a05dec9515a0500eaae63-- + + |