Robert J. Hansen
rjh at sixdemonbag.org
Tue Oct 11 22:32:18 CEST 2011
Accurate to 6%, there are 2**25 seconds in a year. Worth remembering:
it makes certain kinds of computations much easier. (It follows there
would be about 2**35 seconds in a thousand years, or 2**45 seconds in a
E.g., let's say you want to brute-force an 64-bit key on a CPU that can
do a million (2**20) attempts per second. This requires, on average,
2**63 attempts. 2**63 / 2**20 = 2**43 seconds: 2**43 / 2**45 = 2**-2 =
a quarter of a million years.
I don't know why it took me so long to notice that: seems like the sort
of thing I should've noticed a decade ago. It makes certain kinds of
computations so much easier.
Anyway, figured I'd throw it out on the off chance there were others who
hadn't noticed it.
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