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Date: Mon, 10 Mar 2014 14:22:53 +0100 (CET)
From: Stefan.Lucks@...-weimar.de
To: discussions@...sword-hashing.net
Subject: Re: [PHC] Upgrade HKDF to HKDF2?

>> Consider, e.g., passwords such as "abcd", "abcdabcd", "abcdabcdabcd" ...
>>
>
> That's why PBKDF2 hash has collisions for this reason,

For another reason

> but I'm prepending all lengths with an extra Update call before adding 
> padded data.  This should eliminate the collision problem, shouldn't it?

Agreed, that seems to solve the problem.

Stefan

------  I  love  the  taste  of  Cryptanalysis  in  the morning!  ------
     <http://www.uni-weimar.de/cms/medien/mediensicherheit/home.html>
--Stefan.Lucks (at) uni-weimar.de, Bauhaus-Universit├Ąt Weimar, Germany--

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