[RC5] Is RC5-64 taking forever?

Isaac zarkon at concentric.net
Sun Mar 8 11:13:40 EST 1998


At 09:46 PM 3/7/1998 -0600, you wrote:
>I'm not going to re-check your math, but you are very possibly correct
about it taking 50 years at our current rate. The key words there are 'at
our current rate'.

50 years is pretty close to how we're doing at the "current rate".  Here's
my spreadsheet.

total blocks = 68719476736
Date,Days Working,Blocks/Day,Blocks Done,Blocks Left,% Complete,Total
Years,Years Left,Finish
03/08/98 136 3714909 342283526 68377193210 0.4981% 51.726 51.344 04/05/2048
03/07/98 135 3789510 338568617 68380908119 0.4927% 52.689 52.310 03/14/2049
01/12/98 81 3897040 216881829 68502594907 0.3156% 52.880 52.653 05/22/2049
01/11/98 80 3550984 212984789 68506491947 0.3099% 54.802 54.577 04/06/2051
01/10/98 79 3439712 209433805 68510042931 0.3048% 54.339 54.723 10/23/2050
01/09/98 78 3719822 205994093 68513482643 0.2998% 53.213 53.549 09/17/2049
01/08/98 77 3382819 202274271 68517202465 0.2943% 53.658 53.442 02/23/2050
01/07/98 76 3671422 198891452 68520585284 0.2894% 52.102 51.889 08/17/2048
01/06/98 75 3741897 195220030 68524256706 0.2841% 51.613 51.403 02/25/2048

I'm using the average of 4 days of computing to figure out the current
block
rate.  You'll notice we reached a high on blocks processed just before the
DES-II-1 contest, so we may still be catching up to this rate.  Keep in
mind
that these times assume processing the entire key space, and we are picking
up more and more computing power every day.  All these numbers are straight
off the stats server on those dates.

Isaac
  
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