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Date: Sat, 25 Apr 2015 11:57:01 +0200
From: Sascha Schmidt <>
Subject: Re: [PHC] Client-side hashing (was side-channel stuff)

2015-04-25 0:40 GMT+02:00 Steve Thomas <>:
> h = fastHash(password, salt)
> for u = 1 to upgrade
> {
>   h = fastHash(slowHash(h, t_cost, m_cost))
>   t_cost = increaseTCost(t_cost)
>   m_cost = increaseMCost(m_cost)
> }
> return encrypt(h, key) // HSM? :)
You are totally right. I don't know how I missed this. The most
embarrassing thing is, that this would already be possible with
Catena. The only thing missing is the server-side finalization with
I hope I haven't caused any confusion with my previous mail.

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