Date: Thu, 07 Mar 2013 22:50:03 +0400 From: "Sergey V." <sftp.mtuci@...il.com> To: john-users@...ts.openwall.com Subject: Re: [question] How to crack a specific ssh key pass On 2013-03-07 at 10:44:36, Thomas Fétiveau <thomas.fetiveau.tech@...il.com> wrote: > Hi ! Hi > I've just discovered john and I am trying to retreive a pass for one of > my ssh private key. > > I've tried the incremental modes but there are limited to 1 to 8 length > passwords. > > The password I'm searching for has between 10 and 16 chars and is > composed only of these characters: [a-z][0-1-3-5-6] (actually, even > less, I'm sure there is no 'w', 'x', 'y' nor 'z' letters). Since you know possible characters I recommend to use an external mode. See "List.External:KnownForce" mode in john.conf (or john.ini) for example. Also see doc/EXTERNAL for more info. But... If I understand your pattern correctly you mean that the password contain only characters a-v and digits 0,1,3,5,6. Then keyspace is sum(27^i, i, 10, 16) = 82834383187294870546773 and unfortunately it's VERY big for ssh format. > I've read that searching in incremental modes for more than 8 characters > doesn't make sense because it would take too long. > > But is it still true with the range of characters I have ? ie: about 28 > different chars > > If it would still make sense, what should I do to make john searching > for this password ? (I'm running it under windows) > > On a side note: I'm running under a multi-core multi-threaded win 7 64 > bit and the john-opm.exe doesn't use more thread nor core nor CPU usage > than john.exe (the both use just about 12,5% of my overall CPU capacity). OMP works fine for me on linux. Which version of jtr you use? Are you see something like "... (8xOMP) ..." when run "./john --test --format=ssh"? > Thanks in advance > Tom Download attachment "signature.asc" of type "application/pgp-signature" (837 bytes)
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