public inbox for bitcoindev@googlegroups.com
 help / color / mirror / Atom feed
From: Peter Todd <pete@petertodd.org>
To: Matt Corallo <lf-lists@mattcorallo.com>,
	bitcoin-dev@lists.linuxfoundation.org
Subject: Re: [bitcoin-dev] Revisiting NODE_BLOOM: Proposed BIP
Date: Thu, 20 Aug 2015 22:42:19 -0700	[thread overview]
Message-ID: <20150821054219.GB18176@muck> (raw)
In-Reply-To: <20150821053819.GA18176@muck>

[-- Attachment #1: Type: text/plain, Size: 1338 bytes --]

On Thu, Aug 20, 2015 at 10:38:19PM -0700, Peter Todd via bitcoin-dev wrote:
> > Motivation
> > ==========
> > 
> > BIP 37 did not specify a service bit for the bloom filter service, thus
> > implicitly assuming that all nodes that serve peers data support it.
> > However, the connection filtering algorithm proposed in BIP 37, and
> > implemented in several clients today, has been shown to provide little
> > to no privacy, as well as being a large DoS risk on some nodes. Thus,
> > allowing node operators to disable connection bloom filtering is a
> > much-needed feature.
> 
> I'd reference that paper on bloom filters re: the "little to no privacy"
> issue. There's also a post in the bitcoinj mailing list somewhere IIRC
> talking about the default settings, and how they don't provide any
> privacy.

Oh, and we should also point out that Bloom filters have scaling issues,
as each application of the filter has to scan the whole blockchain -
with future blocksize increases these issues increase, in some proposals
quite dramatically. The underlying idea also conflicts with some
proposals to "shard" the blockchain, again suggesting that we need a bit
to handle future upgrades to more scalable designs.

-- 
'peter'[:-1]@petertodd.org
00000000000000000402fe6fb9ad613c93e12bddfc6ec02a2bd92f002050594d

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 650 bytes --]

  reply	other threads:[~2015-08-21  5:42 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-08-21  4:46 [bitcoin-dev] Revisiting NODE_BLOOM: Proposed BIP Matt Corallo
2015-08-21  5:38 ` Peter Todd
2015-08-21  5:42   ` Peter Todd [this message]
2015-08-21 17:55     ` Matt Corallo
2015-08-21 22:06       ` Peter Todd
2015-08-22  1:08         ` Matt Corallo
2015-08-22  1:48           ` Peter Todd
2015-08-24 15:19         ` Tom Harding
2015-08-24 17:39           ` Matt Corallo
2015-08-22  1:08       ` Matt Corallo
2015-08-21  5:48 ` Jeff Garzik
2015-08-21  5:55   ` Peter Todd
2015-08-21  6:01     ` Jeff Garzik
2015-08-21  6:07       ` Peter Todd
2015-08-21 22:15         ` Chris Pacia
2015-08-21 22:25           ` Peter Todd
2015-08-21 23:08         ` Tom Harding
2015-08-24 15:21           ` Mike Hearn
2015-08-21  8:31     ` Andreas Schildbach
2015-08-21 17:53   ` Matt Corallo
2015-08-24 15:29 ` Wladimir J. van der Laan
2015-08-24 17:37   ` Matt Corallo
2015-08-24 17:41     ` Wladimir J. van der Laan
2015-08-24 17:58       ` Eric Lombrozo
2015-08-24 18:00     ` Peter Todd
2015-08-24 18:07       ` Matt Corallo
2015-08-24 18:15         ` Eric Lombrozo
2015-08-24 18:28           ` Matt Corallo
2015-08-24 18:30           ` Wladimir J. van der Laan
2015-08-24 18:33             ` Eric Lombrozo

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20150821054219.GB18176@muck \
    --to=pete@petertodd.org \
    --cc=bitcoin-dev@lists.linuxfoundation.org \
    --cc=lf-lists@mattcorallo.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox