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Author Topic: distributed.net completes rc5-64 project (list announcement)  (Read 3443 times)

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Offline KennyR

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Re: distributed.net completes rc5-64 project (list announcem
« on: September 26, 2002, 08:50:53 AM »
Did I once hear someone on this site say it *must* be the Power Cows who win because they have so many users? :-D
 

Offline KennyR

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Re: distributed.net completes rc5-64 project (list announcem
« Reply #1 on: September 28, 2002, 03:02:13 PM »
Quote
RC5-72 is gonna take forever, though.


You bet it is, even with the Pentium4s and AMD Athlons everyone and their granny seems to have nowadays.

If I worked this out correctly (2^72), then this many keys will have to be tested:

4,722,366,482,869,645,213,696

I don't even know how to say that number!

Compared to RC5-64, which had:

18,446,744,073,709,551,616.

That's 256 times as much. Since RC5-64 began 5 years ago and took 330,000 computers to crack it, at the present rate of CPU speed advancement...well, i guess that CPUs aren't 256 times faster than they were in 1997 - maybe 10 times faster.

So RC-72 would take maybe 25 years, if CPUs stayed the same. But they won't, they'll again increase tenfold, so 25 becomes a multiplier of 2.5 against 5 years...

So it'll take 12.5 years to complete, I think, if the user numbers stay the same. :-)

I could be totally wrong, maths was never my strong suit.