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Date: Wed, 7 Aug 2013 00:09:49 -0700
From: Tony Arcieri <>
To: "" <>, 
	Jean-Philippe Aumasson <>
Subject: Re: [PHC] A (naively?) simple PHC submission using hash chains

On Wed, Aug 7, 2013 at 12:05 AM, Jeffrey Goldberg <>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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