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Date: Mon, 28 Oct 2013 17:47:53 -0700
From: Tony Arcieri <>
To: "" <>
Subject: Re: [PHC] Post-hoc Strengthening

On Mon, Oct 28, 2013 at 5:34 PM, Jeremy Spilman <> wrote:

> You don't *need* the original password in order to strengthen a hash, but
> it tends to get overcomplicated if you try to strengthen a hash value
> without it.
> But it doesn't need to be this way...

Indeed! You might want to take a look at "client-independent updates" in
the Cantena password hash:

Tony Arcieri

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