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The following archive was created by hippie-mail 7.98617-22 on Sat Apr 10 1999 - 01:18:50
James A. Donald (jamesd@echeque.com)
Tue, 09 Mar 1999 17:05:56 -0800
--
Chaum's digital cash is based on blind signatures.
A token that cannot be authenticated by a third party as bank
issue would not constitute a signature, and thus would not be
covered by Chaum's patent.
Wei Dai pointed out that it is not necessary for any third
party to be able to authenticate an ecash token as bank
issue, unlike blinded certificates of age, etc.
All that is needed is that the issuer can verify that a token
corresponds to a document that the issuer issued to a
purchaser, without knowing which document, and that the
purchaser can (by revealing the transformation used and thus
his identity) show that the token in his possession
corresponds to a document issued by the token issuer..
Wei Dai suggested blinded MACs. I think that this cannot
work, but the workaround could work, even though it probably
cannot be done with a MAC.
--digsig
James A. Donald
6YeGpsZR+nOTh/cGwvITnSR3TdzclVpR0+pr3YYQdkG
yNqK43uq864zAoognzmtL0JLALidCJv1EZIg0PV9
4QKN/xfsWCz48zV277iTqKoTV9W4nkOK0B4N1LJtr
-----------------------------------------------------
We have the right to defend ourselves and our property, because
of the kind of animals that we are. True law derives from this
right, not from the arbitrary power of the omnipotent state.
http://www.jim.com/jamesd/ James A. Donald
The following archive was created by hippie-mail 7.98617-22 on Sat Apr 10 1999 - 01:18:50