From: "Warren Togami Jr." <wtogami@gmail•com>
To: Bitcoin Dev <bitcoin-development@lists•sourceforge.net>
Subject: Re: [Bitcoin-development] Gavin's post-0.9 TODO list...
Date: Fri, 16 Aug 2013 04:27:35 -1000 [thread overview]
Message-ID: <CAEz79PoK9u9ffJ5jR8yXk8eCFP0Ytk_bno0mpcpM24mt-GGg5w@mail.gmail.com> (raw)
In-Reply-To: <20130816141536.GD16201@petertodd.org>
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bitcoinj-0.10 release notes:
- We now require Bloom-capable (0.8+) peers by default and will
disconnect from older nodes. This avoids accidental bandwidth saturation on
mobile devices.
Given the user-security concern that Peter brings up, reconsideration of
this new default behavior in SPV clients may be warranted.
On Fri, Aug 16, 2013 at 4:15 AM, Peter Todd <pete@petertodd•org> wrote:
> On Fri, Aug 16, 2013 at 10:01:16AM -0400, Peter Todd wrote:
> > Doing this also makes it more difficult to sybil the network - for
> > instance right now you can create "SPV honeypots" that allow incoming
> > connections only from SPV nodes, thus attracting a disproportionate % of
> > the total SPV population given a relatively small number of nodes. You
> > can then use that to harm SPV nodes by, for instance, making a % of
> > transactions be dropped deterministicly, either by the bloom matching
> > code, or when sent. Users unlucky enough to be surrounded by sybil nodes
> > will have their transactions mysteriously fail to arrive in their
> > wallets, or have their transactions mysteriously never confirm. Given
> > how few full nodes there are, it probably won't take very many honeypots
> > to pull off this attack, especially if you combine it with a
> > simultaneous max connections or bloom io attack to degrade the capacity
> > of honest nodes.
>
> Oh, here's an even better way to do the "tx drop" attack: when you drop
> a transaction, make a fake one that pays the same scriptPubKeys with the
> same amount, and send it to the SPV peer instead. They'll see the
> transaction go through and show up in their wallet, but it'll look like
> it got stuck and never confirmed. They'll soon wind up with a wallet
> full of useless transactions, effectively locking them out of their
> money.
>
> Here's another question for you Mike: So does bitcoinj have any
> protections against peers flooding you with useless garbage? It'd be
> easy to rack up a user's data bill for instance by just creating junk
> unconfirmed transactions matching the bloom filter.
>
> --
> 'peter'[:-1]@petertodd.org
> 0000000000000018dcf5bcc3f018a05517ba1c479b432ba422015d4506496e55
>
>
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next prev parent reply other threads:[~2013-08-16 14:27 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-16 1:00 Gavin Andresen
2013-08-16 4:06 ` Melvin Carvalho
2013-08-16 12:11 ` Mike Hearn
2013-08-16 12:24 ` Mike Hearn
2013-08-16 13:41 ` Warren Togami Jr.
2013-08-16 13:46 ` Mike Hearn
2013-08-16 13:53 ` Warren Togami Jr.
2013-08-16 14:06 ` Peter Todd
2013-08-16 14:56 ` Gregory Maxwell
2013-08-16 14:01 ` Peter Todd
2013-08-16 14:15 ` Peter Todd
2013-08-16 14:27 ` Warren Togami Jr. [this message]
2013-08-16 14:36 ` Mike Hearn
2013-08-16 14:59 ` Peter Todd
2013-08-16 15:06 ` Warren Togami Jr.
2013-08-16 15:11 ` Mike Hearn
2013-08-16 15:13 ` Mike Hearn
2013-08-16 15:59 ` Peter Todd
2013-08-17 0:08 ` Warren Togami Jr.
2013-08-17 12:35 ` Mike Hearn
2013-08-17 13:41 ` Jeff Garzik
2013-08-19 3:09 ` John Dillon
2013-08-19 3:17 ` Peter Todd
2013-08-19 5:00 ` John Dillon
2013-08-19 5:34 ` John Dillon
2013-08-19 5:11 ` Mark Friedenbach
2013-08-19 9:16 ` Mike Hearn
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