phc-discussions - Re: [PHC] A (naively?) simple PHC submission using hash chains

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Message-ID: <CAHOTMVLfPgsHV1LCjszOqsi1PJZb4ZV-HaXL_Riyv8mrJRzAzw@mail.gmail.com>
Date: Wed, 7 Aug 2013 00:09:49 -0700
From: Tony Arcieri <tony.arcieri@...il.com>
To: "discussions@...sword-hashing.net" <discussions@...sword-hashing.net>, 
	Jean-Philippe Aumasson <jeanphilippe.aumasson@...il.com>
Subject: Re: [PHC] A (naively?) simple PHC submission using hash chains

On Wed, Aug 7, 2013 at 12:05 AM, Jeffrey Goldberg <Jeffrey@...dmark.org>wrote:

> In your example, you set hash to be HMAC-SHA256. What requirements on hash
> are there? I would suspect that simply SHA-n would be insufficient, and the
> use of HMAC here is crucial. Is that correct?
>

Honestly that was arbitrary. I think it could work more like
Jean-Philippe's, computing hashes up front of the password/salt, then using
an unkeyed hash function for each step in the chains.

Re: SHA256, I was just following suit with the other examples. It could
easily use e.g. Blake2b instead.

-- 
Tony Arcieri

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