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Why do the statistics measure estimate time to having 50% of the keyspace searched?

April 26, 2017estimate keyspace measure searched statistics time

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Why do the statistics measure estimate time to having 50% of the keyspace searched?

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Because we don’t know where in the keyspace of 72,000,000,000,000,000 the right answer is. On the average, only 50% of the keyspace needs to be searched before a solution is found.