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Date: Mon, 10 Mar 2014 10:38:16 +0100 (CET)
From: Stefan.Lucks@...-weimar.de
To: discussions@...sword-hashing.net
Subject: Re: [PHC] Upgrade HKDF to HKDF2?

On Sun, 9 Mar 2014, Bill Cox wrote:

> for(i = 0; i < passwordLength; i += 256) {
>    for(j = 0; j < 256; j++) {
>        buf[i] = password[(i + j) % passwordLength];
>    }
>    Hash_Update(hashCtx, buf, 256);
> }

Welcome password collisions!

Consider, e.g., passwords such as "abcd", "abcdabcd", "abcdabcdabcd" ...

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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