phc-discussions - Re: [PHC] Re: NoelKDF ready for submission

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Message-ID: <CAOLP8p5SukvwSaKfCCgH5-3=hqya0jn60GWkLpqPenMg6Lm0oA@mail.gmail.com>
Date: Tue, 4 Feb 2014 18:19:20 -0500
From: Bill Cox <waywardgeek@...il.com>
To: discussions@...sword-hashing.net
Subject: Re: [PHC] Re: NoelKDF ready for submission

On Tue, Feb 4, 2014 at 6:03 PM, Bill Cox <waywardgeek@...il.com> wrote:
> On Tue, Feb 4, 2014 at 2:01 PM, Steve Thomas <steve@...tu.com> wrote:
>>> xorIntoHash() needs to be replaced preferably with a cryptographic hash that
>> uses more than the last hash's size bytes of data.

Looking more closely, I see there is an issue if doing a
client-independent update, since the old hash is not run through
PBKDF2-SHA256 to initialize wordHash.  I haven't checked this hash
update code well enough.  The new hash may be too correlated with the
old hash in this case.  I probably need a call to PBKDF2 in the garlic
loop to cleanse any correlations between hashes.

Bill