From: Cameron Garnham <da2ce7@gmail•com>
To: Un Ix <slashdevnull@hotmail•com>
Cc: bitcoin-development@lists•sourceforge.net
Subject: Re: [Bitcoin-development] Proposal: Encrypt bitcoin messages
Date: Wed, 20 Aug 2014 07:40:49 +0200 [thread overview]
Message-ID: <CAACjpwKX9cwowiCruP9xw2UiqfsVXVC1TdKvA1HbQZ6UZ6qBsA@mail.gmail.com> (raw)
In-Reply-To: <BLU402-EAS2546AD6C97DCED8FCE9C04CC6D20@phx.gbl>
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We should aim to use perfect forward secrecy between all nodes by default.
This forces the attacker to do a MITM attack that is far more expensive on
the large scale.
I don't see why this is seen as so controversial. It is relatively cheap
to implement on our side, and has a dramatic increase of cost for any
attackers.
Cam.
On 20/08/2014 5:49 am, "Un Ix" <slashdevnull@hotmail•com> wrote:
> Excuse the ignorance, but there is something I’m not getting in this
> discussion.
>
> Given it’s a published protocol, with available source code running on an
> open P2P network, why would any messages between nodes benefit from being
> encrypted? Surely all the data being processed by the network is known to
> any persistent client node(s)?
>
> Seems like that solution is orthogonal to the root problem, where
> attackers could monitor the network and deduce IP addresses by e.g. mapping
> senders of transactions.
>
> *From:* Peter Todd <pete@petertodd•org>
> *Sent:* Wednesday, August 20, 2014 9:28 AM
> *To:* William Yager <will.yager@gmail•com>,
> bitcoin-development@lists•sourceforge.net
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
>
>
>
> On 19 August 2014 21:19:43 GMT-04:00, William Yager <will.yager@gmail•com>
> wrote:
> >On Tue, Aug 19, 2014 at 8:14 PM, Peter Todd <pete@petertodd•org> wrote:
> >> In any case, my suggestion of enabling hidden service support by
> >default
> >> adds both encryption and reasonably good authentication.
> >
> >
> >Enabling hidden service support by default would introduce an insanely
> >huge
> >attack surface.
>
> Hence my suggestion of separating that surface by using the standalone Tor
> binary, which runs under a different user to the Bitcoin Core binary.
>
> >And you're conflating two different things; using Tor is valuable to
> >Bitcoin because it would provide some anonymity. The encryption aspect
> >is
> >pretty much useless for us.
>
> First of all, without encryption we're leaking significant amounts of
> information to any passive attacker trying to trace the origin of Bitcoin
> transactions, a significant privacy risk.
>
> Secondly the upcoming v0.10's fee estimation implementation is quite
> vulnerable to Sybil attacks. Authentication and encryption are needed to
> make it secure from ISP-level targeting to ensure that your view of the
> network is representative. Tor support used in parallel with native
> connection is ideal here, as neither the Tor network nor your ISP alone can
> Sybil attack you. It's notable that Bitcoinj has already implemented Tor
> support for these same reasons.
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next prev parent reply other threads:[~2014-08-20 5:40 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <c45a638f1e1640fe84bef01d12cda4c3@hotmail.com>
2014-08-20 3:23 ` Un Ix
2014-08-20 5:40 ` Cameron Garnham [this message]
2014-08-20 14:37 ` Mike Hearn
2014-08-23 6:39 ` Troy Benjegerdes
[not found] <CA+8=xuJ+YDTNjyDW7DvP8KPN_nrFWpE68HvLw6EokFa-B-QGKw@mail.gmail.com>
2014-08-19 9:49 ` Raúl Martínez
[not found] ` <0C0EF7F9-DBBA-4872-897D-63CFA3853726@ricmoo.com>
2014-08-19 15:11 ` Raúl Martínez
2014-08-19 15:30 ` Richard Moore
2014-08-19 16:07 ` Justus Ranvier
2014-08-19 16:38 ` Gregory Maxwell
2014-08-19 16:58 ` Angel Leon
2014-08-19 17:19 ` Christophe Biocca
2014-08-19 17:35 ` Johnathan Corgan
2014-08-19 23:38 ` J Ross Nicoll
2014-08-19 23:39 ` Justus Ranvier
2014-08-19 23:54 ` Gregory Maxwell
2014-08-19 23:40 ` Jeff Garzik
2014-08-20 0:16 ` Peter Todd
2014-08-20 0:21 ` Jeff Garzik
2014-08-20 0:41 ` Peter Todd
2014-08-20 0:59 ` William Yager
2014-08-20 1:14 ` Peter Todd
2014-08-20 1:19 ` William Yager
2014-08-20 1:27 ` Peter Todd
2014-08-20 0:49 ` Justus Ranvier
2014-08-20 0:57 ` Peter Todd
2014-08-23 16:17 ` xor
2014-08-23 16:50 ` Justus Ranvier
2014-08-23 17:50 ` Troy Benjegerdes
2014-08-23 18:22 ` William Yager
2014-08-23 18:44 ` Mike Hearn
2014-08-23 19:02 ` Luke Dashjr
2014-08-23 22:51 ` Peter Todd
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