>>>>> "Russell" == Russell Coker <[EMAIL PROTECTED]> writes:
Russell> On Fri, 11 Jun 2004 23:43, [EMAIL PROTECTED] (Rens Houben) wrote: >> Why bother, when said windows machines will have perfectly good >> signatures stored on them somewhere already? Russell> Presumably the signature would be based on the envelope Russell> recipient and therefore signatures you find on someone else's Russell> machine would not do any good. If it was otherwise then a Russell> single signature would work for an entire spam run. Yes. In hashcash, the hashcash token uses the recipient's address, as well as a date. The recipient can keep a database of received tokens to make sure that the same token isn't used twice. Old tokens can be expired, since the token contains the date too. -- Hubert Chan <[EMAIL PROTECTED]> - http://www.uhoreg.ca/ PGP/GnuPG key: 1024D/124B61FA Fingerprint: 96C5 012F 5F74 A5F7 1FF7 5291 AF29 C719 124B 61FA Key available at wwwkeys.pgp.net. Encrypted e-mail preferred.
