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Team Anachronistic
Resources
Active Members
| 1
|
Nicks
| galdr
|
Software
| John the Ripper, Cryptohaze Multiforcer
|
Hardware
|
One 8-core i7, one 4-core i5, and one GeForce GT 430 GPU
|
Approach
I primarily had the two machines working on non-overlapping sets of hash
types and generally progressing from cheap to expensive hash types. My
approach to using John was to utilize as much of the modes and rulesets
as possible. Towards the end, I primarily focused on incremental modes
for the most expensive hash types.
Workflow
I prepared in advance numerous shell scripts and related content that
would permit me to automate long sequences of multicore runs of John,
progressing from simpler hash types to harder types. Impatience and a
desire for a greater volume of cracked hashes, however, caused me to
frequently cancel these sequences once they progressed to the harder
content. This was obviously the wrong approach as my score was quite
low at the thirty hour mark. For the remaining 18 hours, I refocused my
efforts on the hashes I should have focused on to begin with, most
importantly MSCASH2 and BF. I really wish I had started with this
approach as it paid off very quickly.
Nevertheless, as I worked on the easier content, I did create some
additional John rulesets such as a trivially easy variant of the
DateTime external mode to look for the high number of hyphenated dates
("02-07-10") and made some modifications to my existing l33t speak
ruleset ('-zorz', '-ness', '-xor', single-letter l33ting -- certainly
not as encompassing as KoreLogicRulesL33t but frequently adds a few more
hits, "obsessiveness" anyone?).
Final Thoughts
I thoroughly enjoyed the competition. Despite the numerous mistakes I
made, I'm quite pleased at my placement, especially being a one-man team
and the predominantly 12-cores of computation (the Multiforcer work on
the GPU was fairly minimal overall). I look forward to participating
next year.