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Re: resistance to swamping attacks.



> I'm no expert in cryptography, but it seems to me that what is needed is
> a function which is expensive for the originator of a packet to
> calculate, but cheap for the receiver to verify.  This will make sure
> that the source of a swamping attack must have a much larger CPU than
> the receiver.  I don't know if there are any such functions, but perhaps
> the cryptographically sophisticated among us could enlighten?

A simple imbalance in "expense" isn't enough -- what if the attacker
does a lot of precomputation before launching the attack?

					- Bill


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