Date: Sun, 20 Jul 2014 06:48:57 +0400 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: Re: ZedBoard: bcrypt Katja, On Sun, Jul 20, 2014 at 05:12:10AM +0400, Solar Designer wrote: > On Sat, Jul 19, 2014 at 07:10:09PM +0200, Katja Malvoni wrote: > > While testing with > > cost 12, the zed system rebooted. I guess it's overheating since you modded > > the board so it shouldn't be voltage drop problem. > > Yes, as I mentioned to you via private e-mail, in the current plastic > box the board overheats when Zynq PL is in full use for more than a > couple of minutes. I'll look into adding a fan (perhaps 40mm, like old > graphics cards had). I've just added a 40mm 12V 0.08A fan connected at 5V. I tried several of these 40mm 12V fans, and chose one that most reliably spins up at 5V. I think when connected like this it consumes under 0.5W (maybe 0.3W). Compared to Zynq's heatsink, this fan looks huge. ;-) It covers an area about 3x bigger than the heatsink. I don't know where your latest code is, so I've used the older 112 instances code with 64 same-salt cost 12 bcrypt hashes. This test passed with the board already in the plastic box: root@...aro-ubuntu-desktop:~/k3/JtR_112# cat bcrypt_112cores_5brams.bit.bin > /dev/xdevcfg root@...aro-ubuntu-desktop:~/k3/JtR_112/JohnTheRipper/run# ./john -i=digits4 ~solar/pw-bcrypt-12-64 Loaded 64 password hashes with no different salts (bcrypt [Blowfish 32/32]) Press 'q' or Ctrl-C to abort, almost any other key for status 1 (?) 12 (?) [...] 46 (?) 47 (?) 64g 0:00:02:46 0.3848g/s 64.65p/s 64.65c/s 2477C/s 282..275 Use the "--show" option to display all of the cracked passwords reliably Session completed Alexander
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