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The following archive was created by hippie-mail 7.98617-22 on Sat Apr 10 1999 - 01:18:49
Wei Dai (weidai@eskimo.com)
Mon, 8 Mar 1999 04:06:03 -0500
On Sun, Mar 07, 1999 at 04:58:16PM -0800, Wei Dai wrote:
> In online ecash systems based on blind signature schemes, the mint's
> public key doesn't really need to be used by anyone except the mint
> itself. So maybe it would be possible to create a blind ecash system based
> on symmetric cryptography, for example with a blind MAC analogous to blind
> signature. I don't know if such a thing (blind MAC) exists, but if it does
> perhaps it might not be covered by the blind signature patents.
I'll try to stop answering my own posts, but apparently David Wagner did
propose a blind MAC scheme (see
http://x9.dejanews.com/getdoc.xp?AN=145097228) based on Diffie-Hellman.
This also answers the original Anonymous request for a blind variant of
something not covered by patents. The Diffie-Hellman patent has expired,
but I don't know if blind DH is covered by a patent or not.
The following archive was created by hippie-mail 7.98617-22 on Sat Apr 10 1999 - 01:18:49