Re: Chaumian blinding in ECC and ElGamal?

Ryan Lackey (ryan@venona.com)
Mon, 8 Feb 1999 14:37:07 -0400

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I recall when I was searching through patents that Chaum/DigiCash have
a patent on a dlog-based blinded cash scheme. I don't have more details,
and my network connectivity is too haphazard right now to do a lot of
searching on patents.ibm.com...

Also, what *is* the deal with ECC and patents?

I have been told by people:
> at one point (like when the book I have on ECC was published)
> there were a number of fields that were *not* patented. Certicom had
> patents on a bunch of *optimizations* but not on the basic operation, so
> it was possible to do a free ECC-DH. I haven't gotten a straight answer on
> whether more patents have surfaced

Not that I know enough about ECC to trust it with my cash right now...

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