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Date: Fri, 16 Nov 2018 11:51:15 -0500
From: Powen Cheng <>
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 <> 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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