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    Where do they state that they're using a rainbow table? The description it sounds like they don't: "in our DB we store millions (soon billions) of words and different strings aside to their hash". Also the number of 250M records is pretty low for a rainbow table. I'd assume that they use a simple lookup table, not a rainbow table. Commented Apr 20, 2015 at 21:50
  • @CodesInChaos It depends on the concrete definition of rainbow table. They use a table of precomputed hashes to lookup the value for the hash. In my eyes this is a rainbow table. You never will have a rainbow table for all SHA512 hash values. Commented Apr 21, 2015 at 5:57
  • Rainbow tables use hash chaining to reduce the rate of growth below linear. Commented Apr 21, 2015 at 6:00