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Date: Fri, 7 Feb 2014 09:25:50 -0500
From: Bill Cox <>
Subject: Re: [PHC] Opinions sought on whether a specific side-channel leakage
 is ok.

On Mon, Jan 27, 2014 at 10:20 AM, Peter Maxwell <> wrote:
> Without exposing too much of my intended design, I'd like to garner some
> opinion if that is possible.
> As a specific feature of my design, I'm intending on adjusting the
> computational & memory work requirement based on password complexity, in a
> somewhat probabilistic manner.

Here's a patent I found that may impact your idea:

Maybe your design gets around it.  I haven't looked very hard to
figure out what it would take.  I guess I'd better do a patent search
for multiplication time hardening of KDFs...


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