Date: Fri, 16 Nov 2018 11:51:15 -0500 From: Powen Cheng <madtomic@...il.com> To: john-users@...ts.openwall.com Subject: Re: GekkoScience NEWPAC (Dual BM1387) USB Stickminer (New 2PAC) I understand better now and thank you for your insights. “deliberately designs a new password hashing scheme around Bitcoin mining“ Looks like something that is possible if pair with the right talents. I guess one could always design ASIC or use FPGA. On this note, any FPGA that is currently useable with john? I look briefly and I wasn’t able to determine which is better GPU or FPGA. On Fri, Nov 16, 2018 at 10:21 AM Solar Designer <solar@...nwall.com> wrote: > On Fri, Nov 16, 2018 at 09:42:55AM -0500, Powen Cheng wrote: > > Even not through the use of open source of cgminer? > > No. > > > I would think solving > > SHA256 hashes on this miner would be the same as solving hashes on JTR? > > It isn't. > > Bitcoin miners compute double-SHA-256 (not SHA-256) of block headers > (not passwords), in which they adjust the nonce field, and then compare > the result for being not greater than target (not for being equal to a > target hash). This is a sufficiently different task from what we have > in password cracking to make Bitcoin mining ASICs non-reusable. > > The only exception here is if someone deliberately designs a new > password hashing scheme around Bitcoin mining, specifically to reuse > those ex-miners for defensive password hashing. Then the ex-miners > would also be usable offensively. But to my knowledge, no one does that > defensively, so there's also nothing to attack in this way. > > Alexander >
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