phc-discussions - Re: [PHC] A review per day - EARWORM (and a request to the judges)

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Message-ID: <5414262F.3050507@ciphershed.org>
Date: Sat, 13 Sep 2014 07:10:39 -0400
From: Bill Cox <waywardgeek@...hershed.org>
To: discussions@...sword-hashing.net
Subject: Re: [PHC] A review per day - EARWORM (and a request to the judges)

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On 09/13/2014 06:55 AM, Bill Cox wrote:
> It might even be doable on a bot-net.  In a bot-net example, each
> node would hash against 2GiB.  They would have a queue of maybe
> several MiB of partially hashed passwords.  After hashing them all,
> they would be sent to the next node over the Internet.  In his
> case, the Internet bandwidth dominates, but at 256KiB/s, that's
> still 4096 guesses per second, which isn't bad for a bot-net node.

Actually, that would be 4096 password updates per second.  The number
of updates required is set by the t_cost parameter.  The minimum is 1,
in which case this attack is especially ugly since no communication
between botnet nodes is required.  Even with the fix, the minimum
t_cost needs to be high enough to make communication bandwidth between
nodes a heavy limiting factor.  The arena size could be decreased to
help compensate for increasing the minimum t_cost.

Bill
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