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Looks like the winning team was able to generate more than 400 million keys per second.

"With all the machines running we got up to a total of 3079431974 hashes/second" (via http://www.win.tue.nl/cccc/sha-1-challenge.html)

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Uhoh - I missed decimal place. 3 billion/sec would mean about 3000 of the cheapest Rackspace cloud machines, which could have been operated for 18 hours for about $810. I'm not sure Rackspace lets you have that many though.

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