phc-discussions - Re: [PHC] Opinions sought on whether a specific side-channel leakage is ok.

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Message-ID: <CAOLP8p6UbkHrcP19iq+=sAyrfqH63P2_WSKtwU6VRS7D9xJ72g@mail.gmail.com>
Date: Fri, 7 Feb 2014 09:25:50 -0500
From: Bill Cox <waywardgeek@...il.com>
To: discussions@...sword-hashing.net
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 <peter@...icient.co.uk> 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:

http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.htm&r=125&f=G&l=50&d=PTXT&s1=password.TI.&p=3&OS=TTL/password&RS=TTL/password

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...

Bill