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Date: Mon, 14 Nov 2016 18:49:00 +0100
From: magnum <john.magnum@...hmail.com>
To: john-users@...ts.openwall.com
Subject: Re: Brainwallets and cracking Blockchain hashes

On 2016-11-11 23:18, Luis Rocha wrote:
> Lately I've been reading about bitcoin and come across a very interesting
> project called brainflayer by Ryan Castelllucci that was presented on
> Defcon last year - https://www.youtube.com/watch?v=foil0hzl4Pg- . It's
> essentially cracking the password of bitcoin brainwallets. Braiwallets
> generate bitcoin addresses but the keys are generated with low entropy.
>
> So it’s possible to crack it just like JtR does for passwords. Was
> wondering if JtR code would be faster on CPU than his implementation.  I
> know JtR  already has support for raw-sha256 and ripmed-160 on Dynamic
> formats. Maybe an interesting project would be to add the support for
> secp256k1.
> (...)

I'm not going to look into this myself, but I opened an issue for it:
https://github.com/magnumripper/JohnTheRipper/issues/2334

magnum

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