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Date: Fri, 16 Nov 2018 16:21:34 +0100
From: Solar Designer <>
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?


> 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.


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