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Re: New Whitepaper: Anti Brute Force Resource Metering

from [Luca Berra] Network Security [Permanent Link]
Subject: Re: New Whitepaper: Anti Brute Force Resource Metering
Date: Fri, 25 Mar 2005 23:03:03 +0100
On Thu, Mar 24, 2005 at 07:33:40PM -0000, Jason W wrote: 
In-Reply-To: <20050321182737.81B6B15F507@mail.ngssoftware.com>


Resource metering through client-side computationally intensive "electronic
payments" can provide an alternative strategy in defending against brute
force guessing attacks.


The first question I had was,
Why not just use a turing test. It's simple and, theoretically, only humans can distinguish the passphrase. It requires much less overhead. Obviously this would be used in addition to a password. That's my two cents. 

Be certain that your turing test does not rule out certain classes of
humans, eg. a text displayed as an image would be undecipherable by a
blind user.

Regards,
L.

--
Luca Berra -- bluca@comedia.it
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