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Date: Mon, 4 May 2015 16:51:51 +0200
From: Sascha Schmidt <>
Subject: Re: [PHC] Client-side hashing (was side-channel stuff)

I added the missing keyed finalization to Catena. You can now use
server relief, keyed hashing and client-independent updates together.
You can find it on github for now, but I'm sure that we are going to
update the submission soon.

2015-04-25 11:57 GMT+02:00 Sascha Schmidt <>:
> 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
> encryption.
> I hope I haven't caused any confusion with my previous mail.

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