MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8;
 format=flowed
Content-Transfer-Encoding: 8bit
Date: Sat, 19 Dec 2015 22:40:06 -0500
From: jl2012 <jl2012@xbt.hk>
To: Chris Priest <cp368202@ohiou.edu>
In-Reply-To: <CAAcC9yvh2ma2dFhNDEKs7vfXyQF9L+T0YtRvOsJ15AbfVti=cw@mail.gmail.com>
References: <20151219184240.GB12893@muck>
	<CAAcC9yvh2ma2dFhNDEKs7vfXyQF9L+T0YtRvOsJ15AbfVti=cw@mail.gmail.com>
Message-ID: <219f125cee6ca68fd27016642e38fdf1@xbt.hk>
User-Agent: Roundcube Webmail/1.0.5
Cc: bitcoin-dev@lists.linuxfoundation.org
Subject: Re: [bitcoin-dev] We need to fix the block withholding attack
Precedence: list

Chris Priest via bitcoin-dev 於 2015-12-19 22:34 寫到:
> Block witholding attacks are only possible if you have a majority of
> hashpower. If you only have 20% hashpower, you can't do this attack.
> Currently, this attack is only a theoretical attack, as the ones with
> all the hashpower today are not engaging in this behavior. Even if
> someone who had a lot of hashpower decided to pull off this attack,
> they wouldn't be able to disrupt much. Once that time comes, then I
> think this problem should be solved, until then it should be a low
> priority. There are more important things to work on in the meantime.
> 

This is not true. For a pool with 5% total hash rate, an attacker only
needs 0.5% of hash rate to sabotage 10% of their income. It's already
enough to kill the pool