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Date: Thu, 09 Jan 2014 10:14:17 +0100
From: Christian Forler <>
Subject: Re: [PHC] Lyra, Password Key Derivation Based On The Sponge Construction

On 09.01.2014 01:43, Bill Cox wrote:
> Wow... MD5crypt.  I am a noob, and I've been telling my wife that I've
> name an algorithm after my cat.
> Sorry about being noisy.  I'm just looking for every opportunity to push
> my primary point about the design of memory-hard KDFs: they should be
> fast, fill lots of memory, and any CPU cycles wasted on computing a
> crypto-strength hash per memory location is a waste of time.

"All of our methods for doing this involve finding some function F()
which approximates a random function and which requires roughly 2^t
work to compute." --

It is quite hard so show such a behavior for a algorithm F() which is
not based on a cryptographic primitive. Moreover, the random function
approx. property is crucial since a cryptographic key is assumed to be

Best regards,

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