RSA or DSA keylength as an anti-spam feature

[Robert J. Hansen]

> Could this last property of bigger keys, significantly increasing CPU
> time needed to send encrypted/signed messages, be used as an anti-spam
> feature?

Not really.  If you've got a hijacked botnet of 50,000 machines, what do
you care if the CPU gets pegged?  You're not the machine's owner.

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