Date: Sun, 18 Nov 2012 13:30:57 +0530 From: Dhiru Kholia <dhiru.kholia@...il.com> To: john-users@...ts.openwall.com Subject: Re: cracking passwords with a kerberos traffic dump / aes256-cts-hmac-sha1-96 (18) [MS] On Sun, Nov 18, 2012 at 6:59 AM, buawig <buawig@...il.com> wrote: >> As in standard Kerberos? It would surprise me a whole lot if >> Microsoft do not use the Unicode version of the password, or (even >> more likely) the 16 byte NT hash as input just like in mskrb5, as >> opposed to the plain string you use now. > > Ok, this makes it clear why I was not be able to crack it. So the > outcome will be a MS specific john format (mskrb5-18). I don't think that it is necessary to modify krb-ng_fmt_plug.c to support M$ AD specifically as M$ AD follows RFC. As I suspected, the problem turned out to be that the fast PBKDF2 doesn't handle long passwords. I have switched back to safer but slower implementation of PBKDF2 and I can successfully crack M$ AD long passwords (> 16 chars). Please try attached code. M$ AD pcap files are included in http://dl.dropbox.com/u/1522424/KerberosCapturesV2.tar.gz -- Cheers, Dhiru View attachment "krb-ng_fmt_plug.c" of type "text/x-csrc" (14538 bytes)
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