[RC5] Time out and DES-II-2 challenge

Skip Huffman SHuffman at Atl.Carreker.Com
Mon Jun 29 16:52:11 EDT 1998

On Mon, 29 Jun 1998 09:45:29 -0600, Steve Bird wrote:

>If the key could easily be found using the 2^28 keysize then why even
>use the 2^30??  Could someone explain the significance of the size of
>the exponent (other than ....the bigger the exponent, the bigger the

It just relates to the amount of work that your system crunches at
one time.  2^28 keys or 2^30 keys.  Your client only reports blocks
back to the central server, not the results from each key. (Except
for possible solutions, of course.)  So if you set your client up to
buffer 100 blocks of size 2^28 it will do the same amount of work as
if you set it to buffer 25 blocks of size 2^30, but the server has to
do four times as much work to deal with the smaller blocks.

Skip Huffman, Carreker-Antinori
Atlanta Office, Quality Group    

You know that you are drinking 
too much coffee if:
... You don't tan, you roast.

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