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Date: Tue, 4 Dec 2012 17:54:04 +0100
From: magnum <>
Subject: Re: Cracking a GPG keyring

On 4 Dec, 2012, at 12:42 , Dhiru Kholia <> wrote:
> On Tue, Dec 4, 2012 at 5:07 PM, magnum <> wrote:
>> On 4 Dec, 2012, at 12:29 , Dhiru Kholia <> wrote:
>>> Ensure that your key uses SHA1 based s2k function before using the
>>> OpenCL gpg format.
>> Will gpg2john and/or the format's valid() reject it if unsupported? Or will it happily try to attack it without a chance?
> This rejection should be done in format's valid method. However, I
> have been lazy in doing it so far :(

In cases like this it's *really* important that it gets rejected somewhere in the chain (could be in gpg2john as well, or even as an assertion in in get_salt() but that is a crude solution for no reason) and IMHO you should place it in, well, the top line of your to-do list. Imagine someone spending literally months with 96 CPU cores just to find out your format gladly and silently accepted input that it simply can not crack.


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