From: Braydon Fuller <braydon@purse•io>
To: bitcoin-dev@lists•linuxfoundation.org
Subject: [bitcoin-dev] Chain width expansion
Date: Thu, 3 Oct 2019 17:38:36 -0700 [thread overview]
Message-ID: <42cd5ffd-63e8-b738-c4ea-13d0699b1268@purse.io> (raw)
Hi everyone,
We would like to share a paper for broad discussion, it is titled
"Bitcoin Chain Width Expansion Denial-of-Service Attacks".
From the abstract: The attacks leverage unprotected resources for a
denial-of-service by filling the disk and exhausting the CPU with
unnecessary header and block data. This forces the node to halt
operation. The attack difficulty ranges from difficult to easy. There
are currently limited guards for some of the attacks that require
checkpoints to be enabled. This paper describes a solution that does not
require enabling or maintaining checkpoints and provides improved security.
As the checkpoints in Bitcoin Core have not been maintained or updated
since mid 2014, this is especially relevant. Bitcoin Core implements
headers-first synchronization, since 2014, that provides the base for
the further improvements upon that design.
The paper is available at:
https://bcoin.io/papers/bitcoin-chain-expansion.pdf
The proposed solution has been implemented in Bcoin and is available at:
https://github.com/bcoin-org/bcoin/tree/chain-expansion
Best,
Braydon Fuller
next reply other threads:[~2019-10-04 0:38 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-04 0:38 Braydon Fuller [this message]
2019-10-04 8:20 ` David A. Harding
2019-10-04 19:51 ` Braydon Fuller
2019-10-11 21:24 ` Braydon Fuller
2019-10-04 23:31 ` Tier Nolan
2019-10-10 16:16 ` Braydon Fuller
2019-10-12 16:27 ` Tier Nolan
2019-10-12 17:56 ` Joachim Strömbergson
2019-10-12 20:46 ` Tier Nolan
2019-10-16 19:07 ` Braydon Fuller
2019-10-15 0:42 ` Braydon Fuller
2019-10-15 7:20 ` Joachim Strömbergson
2019-10-15 8:12 ` Braydon Fuller
2019-10-15 15:50 ` Joachim Strömbergson
2019-10-16 19:25 ` Braydon Fuller
2019-10-15 18:30 ` Tier Nolan
2019-10-15 0:38 ` Braydon Fuller
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=42cd5ffd-63e8-b738-c4ea-13d0699b1268@purse.io \
--to=braydon@purse$(echo .)io \
--cc=bitcoin-dev@lists$(echo .)linuxfoundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
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