![]() The worst case is that the last key you try is correct: you have 2 256 keys divided by around 2 21 checked a second (that's more like 2.1 million, but close enough), which is 2 235 seconds, which according to Wolfram Alpha is around 1.75 vigintillion (that's 1.75*10 63) years, or around 1.3*10 53 times the age of the universe. ![]() The best case is that the first key you try is correct: total time is half a microsecond. Well, using simple math: If checking one key takes 1000 clock cycles, and the computer has 2,000,000,000 cycles per second, it checks 2 million keys per second.
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