On Mon, 30 Apr 2001, Scott G. Miller wrote:
> >
> > Think cash is a stupid idea, and won't work in practice. You don't
> > want to be trying to solve puzzles when you really just want to send
> > your email or post messages.
>
> There are only two ways I can think of to have a communications system
> with a public address that isn't mechanically spammable:
>
> 1) Think Cash. BTW, I don't really agree that they wont work in practice,
> you can make a puzzle that is trivial for a human but difficult for
> a machine. Not just trivial, but even fairly non-intrusive.
>
> 2) Cryptographic permission based email. This would entail generating a
> 'credit' that you give to a person you want to email you. He/she can
> perform a calculation with the credit and say the day/hour when the
> email will be sent. Your email client then checks for the key that
> calculation generates. Only the people you issue credits to can
> send you email. For this reason its no good for email where just
> anybody can send you something. For that you need (1) or you issue
> a few credits and post them on your freesite and hope they dont colide.
>
Reminds me of SecureCard, the credit card sized random number generator
synchronized with a login password challenge. Could use Think Cash to
seed it so that you don't have to solve a puzzle every email.
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