[rc5] Random keyblocks (and Tardy Blocks)

Adam Haberlach HaberlaA at testlab.orst.edu
Mon Aug 25 12:53:52 EDT 1997


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- -----Original Message-----
From:	Geoffrey Graham [SMTP:ggraham at ucsd.edu]
Sent:	Monday, August 25, 1997 11:33 AM
To:	rc5 at llamas.net
Subject:	Re: [rc5] Random keyblocks (and Tardy Blocks)

>I have also wondered about the "Tardy Blocks" problem.  Does
>anyone know
>what happens to these?  Say someone wants to run the client,
>downloads
>five blocks, and then decides it's too taxing on their system
>and shuts
>off the client.  What happens to the unfinished blocks and how
>long do
>the block servers wait before handing them out????

	It does not matter.  Theoretically, every key has the exact
same probability of being correct.  This means that it does not
matter in which order we test them.  Except for the overhead
involved in keeping track of keys that were not included in the
keyspace, there is no reason to worry about them.  five blocks
in 268435456 is a one in  1.862645149231e-8 chance that we've
missed it and have to come back.

<rant>
	When are people going to stop asking these questions?
	Why do people insist that missed keys are valuable?
	Why do people think that checking them in order is important
(except for tracking overhead)?
</rant>
- ---
Adam Haberlach      haberlaa at ucs.orst.edu 
http://www.engr.orst.edu/~haberlad
Crack DES now! http://www.frii.com/~rcv/deschall.htm

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