I was skeptical too, but all it takes is 60 bits, i.e. 60 "yes/no"-questions in their "black book". Doesn't sound too far-fetched. But, of course, I do hope the

I was skeptical too, but all it takes is 60 bits, i.e. 60 "yes/no"-questions in their "black book". Doesn't sound too far-fetched. But, of course, I do hope they're not brute-forcing it. See http://www.wolframalpha.com/input/?i=log2%28one+quintillion%29 http://www.wolframalpha.com/input/?i=log2%28one+quintillion%....