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Date: Thu, 24 Jan 2013 20:06:42 +0100
From: magnum <john.magnum@...hmail.com>
To: john-dev@...ts.openwall.com
Subject: Re: Formats ssh and ssh-ng
On 24 Jan, 2013, at 19:18 , Frank Dittrich <frank_dittrich@...mail.com> wrote:
> That it can produce false positives is not that much of a problem,
> provided the probability of false positives is very small.
> (Did anybody compute that probability?)
> Because of FMT_NOT_EXACT, john will not remove that hash once the first
> match is found.
> And you can still use --format=ssh to verify the password.
I had a look at check_padding_3des() that verifies the result. It's hard to calculate a probability. The padding check might give false *negatives* unless there always is padding present even for blocks that happened to be aligned. But it looks to me it would be a pretty freaking unreal coincidence if it ever made a false positive. If you ask me (but you shouldn't), we could remove the FMT_NOT_EXACT flag.
Can't you batch creation of a million test files and try cracking them? That's what I did with RAR. It's a pity key file creation is so slow :-)
BTW I just committed an unrelated fix to that format.
magnum
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