Date: Thu, 18 Aug 2011 23:06:26 +0400 From: Solar Designer <solar@...nwall.com> To: announce@...ts.openwall.com Subject: [openwall-announce] team john-users writeup for DEFCON 2011 "Crack Me If You Can" contest Hi, As many of you are aware, some of the most active members of the john-users mailing list hosted by Openwall participated in KoreLogic's "Crack Me If You Can" password cracking contest at DEFCON earlier this month, as team john-users. Openwall provided the team with a contest server, which was used to coordinate activities of the team's members, to exchange files, and to automatically submit cracked passwords to the contest organizers. The team consisted of 16 active members who ran John the Ripper and a few other tools on a total of over a hundred of CPU cores (estimated at 150 average, 300 peak) over the 48-hour period. We ended up taking 3rd place overall (out of 22), we're first for 5 out of 20 hash types, and we're first in terms of the total non-weighted number of hashes cracked (although this last thing is due to us completing a certain challenge that other teams apparently did not, which increased the total number of hashes available to us to crack). Additionally, we temporarily held 1st place during the contest at two times. The contest was fun and challenging, it helped us test some experimental John the Ripper code and identify areas for further improvement. Here are the statistics for all teams: http://contest.korelogic.com/stats.html including pretty graphs of teams' progress over time, and here are the per-hash crack numbers for our team in particular: http://contest.korelogic.com/stats_7D47E99A316E29D7.html Although we wouldn't mind winning the 1st place, our 3rd place is reasonable and fair, considering that we had roughly 10 times less GPU power than the winning team did (we used roughly twice more CPU power, though) and we essentially limited ourselves to use of Open Source tools, which other top performing teams did not. (Almost all teams in this contest made use of John the Ripper, which was essential given the variety of hash types. However, many teams used other tools as well, especially to make efficient use of GPUs.) Today, we're making available our writeup on our experience in the contest: http://www.openwall.com/lists/john-users/2011/08/18/10 Other teams' writeups are or will be linked from: http://contest.korelogic.com/teams.html I hope some of you will find this useful or at least curious. Alexander
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