Date: Fri, 16 Nov 2018 16:21:34 +0100 From: Solar Designer <solar@...nwall.com> To: john-users@...ts.openwall.com Subject: Re: GekkoScience NEWPAC (Dual BM1387) USB Stickminer (New 2PAC) 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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