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Message-ID: <560BD7B2.408@openwall.com> Date: Wed, 30 Sep 2015 15:38:10 +0300 From: Alexander Cherepanov <ch3root@...nwall.com> To: discussions@...sword-hashing.net Subject: Re: [PHC] Specification of a modular crypt format On 2015-09-28 14:50, Dmitry Khovratovich wrote: > On Sun, Sep 27, 2015 at 11:20 PM, Alexander Cherepanov <ch3root@...nwall.com> wrote: >> Hm, there seems to be some indeterminism in Argon2 itself here? According >> to spec: "The actual number of blocks is $m'$, which is $m$ rounded down to >> the nearest multiple of $4p$." > > To ease the hashing process, Argon2 allocates the same amount of memory > for each thread. Therefore, when you request 9 or 10 KB of memory and 2 > threads, 8 KBytes will be used in fact. The output values will be > different, of course, as the requested 'm' is hashed as well. Great! And about parallelism. It seems it's now allowed to be up to 255 but one place in the spec is not updated: "Parallelism. Argon2 may use up to 64 threads in parallel, although in our experiments 8 threads already exhaust the available bandwidth and computing power of the machine." -- Alexander Cherepanov
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