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From: Adam Back <adam@cypherspace.org>
To: Peter Todd <pete@petertodd.org>
Cc: Bitcoin-Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] blind symmetric commitment for stronger byzantine voting resilience (Re: bitcoin taint & unilateral revocability)
Date: Wed, 15 May 2013 13:49:56 +0200	[thread overview]
Message-ID: <20130515114956.GA5863@netbook.cypherspace.org> (raw)
In-Reply-To: <20130515111906.GA26020@savin>

On Wed, May 15, 2013 at 07:19:06AM -0400, Peter Todd wrote:
>Protocols aren't set in stone - any attacker that controls enough
>hashing power to pose a 51% attack can simply demand that you use a
>Bitcoin client modified [to facilitate evaluation of his policy]

Protocol voting is a vote per user policy preference, not a CPU vote, which
is the point.  Current bitcoin protocol is vulnerable to hard to prove
arbitrary policies being imposable by a quorum of > 50% miners.  The blind
commitment proposal fixes that, so even an 99% quorum cant easily impose
policies, which leaves the weaker protocol vote attack as the remaining
avenue of attack.  That is a significant qualitative improvement.

The feasibility of protocol voting attacks is an open question, but you
might want to consider the seeming unstoppability of p2p protocols for a
hint.

Adam



  reply	other threads:[~2013-05-15 11:50 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-05-14 11:51 [Bitcoin-development] ecash and revocability Adam Back
2013-05-14 14:09 ` [Bitcoin-development] bitcoin taint & unilateral revocability (Re: ecash and revocability) Adam Back
2013-05-14 14:27   ` Simon Barber
2013-05-14 17:30   ` grarpamp
2013-05-15 10:25   ` [Bitcoin-development] blind symmetric commitment for stronger byzantine voting resilience (Re: bitcoin taint & unilateral revocability) Adam Back
2013-05-15 11:19     ` Peter Todd
2013-05-15 11:49       ` Adam Back [this message]
2013-05-15 12:40         ` Caleb James DeLisle
2013-05-15 16:21           ` Adam Back
2013-05-15 18:01             ` Caleb James DeLisle
2013-05-15 23:40             ` Adam Back
2013-05-16  1:24               ` Gavin
2013-05-16  1:39                 ` Gregory Maxwell
2013-05-16  2:22                   ` Mike Hearn
2013-05-16  2:45                     ` Gregory Maxwell
2013-05-16  5:52                       ` Caleb James DeLisle
2013-05-16 11:32                       ` Adam Back
2013-05-16 14:51                         ` Adam Back

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