What about a Whitelist plus HashCash for people not on the list? The recipient could specify how much HashCash they want.
Also, I've been thinking of an extension to HashCash which I call TuringCash. It has the advantage that it would be much harder to accelerate with specialized hardware. TuringCash works like this. Specify a little virtual machine with a very clean instruction set. The email recipient publishes the algorithm to run and the expected running time. The output of the algorithm must be submitted (just like the hash collision in the case of HashCash). The virtual machine sandbox would be provably secure (not hard with a clean instruction set). On Wed, May 02, 2001 at 07:15:16PM -0500, Brandon wrote: > > > If a system like this became wide spread, > > I would go back there and and start a company that solved these puzzles > > wholesale by the thousand for people who for one reason or another wanted > > them solved. > > Oskar is right. A think cash system only stops a weak attacker. So it > protects against script kiddies to some extent but doesn't help against > Them. > > So my conclusion on think cash is that when a hard to defeat puzzle > generator is written I will be happy to add support for optional think > cash to arbitrary indices and until then there's not much to talk about. > > > > _______________________________________________ > Devl mailing list > Devl at freenetproject.org > http://lists.freenetproject.org/mailman/listinfo/devl -- Dev Random Fingerprint: 3ABC FCEF 1BCE 4528 E4FD 15EB 173A 76D2 6959 DAF1 -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 232 bytes Desc: not available URL: <https://emu.freenetproject.org/pipermail/devl/attachments/20010502/1b7bd534/attachment.pgp>
