[RC5] RE:

Bojan Baros barosb1 at lasalle.edu
Fri Jan 16 14:03:15 EST 1998



On 16 Jan 1998, Bernd Sokolowsky wrote:

> >>>>> Colin L Hildinger writes:
> 
> CLH> Well, DES is only about twice as fast AND the block sizes, while
> CLH> technically correct, are incorrect.  The keyservers hand you a
> CLH> 2^30 DES block and you process all 2^30 PLUS the 2^30
> CLH> complimentary keys for a grand total of 2^31 keys.  That means
> CLH> that it's 8 times larger and only twice as fast so it takes 4
> CLH> times longer.
> 
> What irritates me a little is the following:
> 
> As far as I know I fetched only 2^30 blocks (I never touched this
> config option) and I see blocks processing in roughly 7 hours 
> reporting about 85 kkeys/sec. This is on a 486DX40 running Linux.
> Occasionally though rc5des finishes a block in 3:38 (the keyrate
> is not increased). How can this happen ? 
> 
> Bernd. (client rc5des383-linux-x86-nonmt.tar.gz)
> 
> [01/15/98 22:39:51 GMT] DES 2^30 Block: 00006B2E:50000000 being processed
> [01/15/98 22:39:51 GMT] 42 Blocks remain in file buff-in.des
> [01/15/98 22:39:51 GMT] 2 Blocks are in file buff-out.des
> .....10%.....20%.....30%.....40%....R.50%.....60%.....70%.....80%.....90%..
**********************                A
YOUR ANSWER IS HERE!!!!! -------------|
you turned the client off, somewhere just before the middle, and than 
started it again.  The client only measures time from start of the client 
or start of the block until finishing the block
*********************

> ...
> [01/16/98 02:17:50 GMT] Completed block 00006B2E:50000000 (-2147483648 
> keys)
>                         03:37:59.20 - [82817.75 keys/sec]
> --
> Bernd Sokolowsky --- Raumerstr. 7 --- D-91054 Erlangen --- 09131-29110
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