[RC5] Do not forget about the cheaters :)

Décio Luiz Gazzoni Filho decio at revistapcs.com.br
Fri Jan 9 06:18:59 EST 2004


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Unfortunately, this requires reissuing blocks and effectively wasting work in 
the process. The scheme described on my other email requires no reissuing of 
keys, and shouldn't have much more overhead than the current system (though 
there needs to be an array to store all the matches collected during that 
block), and of course it can detect cheaters with high probability.

Décio

On Friday 09 January 2004 08:34, Slawek wrote:
> The simplest possible method of verifying the clients
> is making them report CMCcount for each block tested.
>
> Some blocks may be sent to other used for recheck
> and/or checked by d.net staff and results compared.
>
> This has no overhead for the client as CMCcount
> is already counted by all the cores.
>
> To break this the cracker would need to break rc5
> rendering all of the distributed.net rc5 work useless.
>
> Attacker may be able to guess CMCcount once or twice
> but it's virtually not possible to constantly guess it.
>
>
> /Slawek
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