# [RC5] Around the Globe

Bruce Wilson bwilson at distributed.net
Wed Dec 18 11:49:03 EST 2002

```Did you factor in that each notch on a key holds about 2^3 bits (10
possible depths) of information?  How about the number of cuts per
inch?

How long would a single key be if it needed to encode 2^72 bits of
information?

(Have fun at work)

__
Bruce Wilson <bwilson at distributed.net>
PGP KeyID: 5430B995, http://www.toomuchblue.com/

"I want to move to Theory. Everything works in Theory."
--John Cash, id Software

| -----Original Message-----
| From: owner-rc5 at lists.distributed.net
| [mailto:owner-rc5 at lists.distributed.net] On Behalf Of Greg Lobring
| Sent: Wednesday, December 18, 2002 10:49
| To: rc5 at lists.distributed.net
| Subject: [RC5] Around the Globe
|
|
| Lets assume the distance around the Earth at it's equator is 40,074
| kilometers (~24,900.8 miles).
|
| Lets imagine an RC5-72 key really looked like an actual
| physical key (the
| kind that opens doors). And lets say these keys are each 3
| inches long
| (~7.62 centimeters). At this measurement, it would take
| ~525,903,333 keys
| laid end to end to circle the Earth at it's equator.
|
| As there are 4,722,366,482,869,640,000,000 keys, if you laid them
| end-to-end, they would circle the Earth a little under 9
| trillion times
| ~8,979,533,278,365 times to be more precise).
|
| You know what? That is a lot of keys.
|
| Heh, its a slow day at work. I think my math is correct.
|
|
|
|
|
| >From: "Christian Wirth" <wirthi at gmx.at>
| >To: <rc5 at lists.distributed.net>
| >Subject: Re: [RC5] Thanks
| >Date: Wed, 18 Dec 2002 13:19:38 +0100
| >
| >Yea, I fully agree!
| >
| >Of course it's important the project is running, the stats
| are online &
| >working correctly, and so on.
| >
| >But even more important for us is that you report us (from
| time to time)
| >what is going on. I personaly prefer "sorry guys, didn't
| have any time,
| >perhaps next week" than not knowing what's going on.
| >
| >Keep up the good work,
| >Christian Wirth
| >
| >----- Original Message -----
| >From: "James Healy" <jimmy at deefa.com>
| >To: <rc5 at lists.distributed.net>
| >Sent: Wednesday, December 18, 2002 1:47 AM
| >Subject: [RC5] Thanks
| >
| >
| > > Just wanted to thank the dnet staff for all the .plan updates
and
| > > feedback the user base has been receiving in recent weeks.
| > >
| > > It's exactly what is needed to help keep everyone interested...
I
| > > spose the fixing of the .plans mailing list also helped
| the process...
| > >
| > > thanks!
| > >
| > > James
| > >
| > > --
| > > To unsubscribe, send 'unsubscribe rc5' to
| >majordomo at lists.distributed.net
| > > rc5-digest subscribers replace rc5 with rc5-digest
| > >
| >
| >--
| >To unsubscribe, send 'unsubscribe rc5' to
| majordomo at lists.distributed.net
| >rc5-digest subscribers replace rc5 with rc5-digest
|
|
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