Payments as an answer to spam

[James A. Donald]

    --
"Arnold G. Reinhold" <reinhold at world.std.com> writes:
> > If hashcash proof of work is combined with an easy to use
> > whitelist, the hash stamp is only needed when communicating
> > with strangers. For

On 17 May 2003 at 13:26, Derek Atkins wrote:
> That's not sufficient.  Spammers regularly forge email
> addresses. I've received spam apparently from people I know,
> but it's clearly not from them.  So, just using white lists
> on the "From: " address is not sufficient.  You still need
> some content filtering (either via a coin, a signature, or
> something easily-verified).

Filtering on the from line would be somewhat effective, as the
spammer does not know who is on your white list.  To really
bullet proof it, you would want to white list the sender's
public key.

(This does not require public key infrastructure, which costs
about one hundred dollars per seat per year.)

Ideally one would support both white listing on the "from" and
white listing on the unauthenticated public key.  White listing
on authenticated public keys would be too costly and
inconvenient. 

    --digsig
         James A. Donald
     6YeGpsZR+nOTh/cGwvITnSR3TdzclVpR0+pr3YYQdkG
     AXCWftLjRR5FVGhESYJ55jh+4IrHVYrf9+9aR7WB
     4h6CYZupzEIIiVAIt69gw0ZltToh8aqw2PLM3kGyI


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