> Flooders have very little effect: all they can do is slightly increase the
> size of the list, so they'll get bored and probably stop. There's no
> mechanism for censorship, either: there are no gods who can expunge
> identities, and there is no voting. There is little processing to be done
> by the client, too: all the client need do is download the new message
> "chunk" of the list and filter it with the killfile.
You are really proposing two separable things, hash cash and client-side
filtering. I'm all for client-side filtering, but it only works up to a
point. Too much flooding and it will take forever to filter out the junk.
Hash cash on the other hand doesn't really solve anything. It just raises
the barrier to entry. Weak attackers are eliminated but then so are weak
participants. If you use a gigahertz pentium as the point on which to
based your hash function, then you've eliminated attackers with a
gigahertz pentium or below, eliminated participants with a 486 and left
the door wide open for an attacker with a supercomputer.
If you're worried about obnoxious kids then there are other ways to get
rid of them. If you're worried about Them then hash cash won't help you.
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