[15396] in cryptography@c2.net mail archive
Re: chaum's patent expiry? (Re: Brands' private credentials)
daemon@ATHENA.MIT.EDU (Jason Holt)
Tue May 25 14:35:00 2004
X-Original-To: cryptography@metzdowd.com
X-Original-To: cryptography@metzdowd.com
Date: Mon, 10 May 2004 03:03:56 +0000 (UTC)
From: Jason Holt <jason@lunkwill.org>
To: Adam Back <adam@cypherspace.org>
Cc: cryptography@metzdowd.com
In-Reply-To: <20040509091559.GA24140@bitchcake.off.net>
On Sun, 9 May 2004, Adam Back wrote:
> Anyone have to hand the expiry date on Chaum's patent? (Think it is
> in patent section of AC for example; perhaps HAC also).
I think it's June 2005. Actually, now that you mention Chaum, I'll have to
look into blind signatures with the B&F IBE (issuing is just a scalar*point
multiply on a curve). That could be a way to get CA anonymity for hidden
credentials - just do vanilla cut and choose on blinded pseudonymous
credential strings, then use a client/server protocol with perfect forward
secrecy so he can't listen in. Hm, I'll have to think it out.
-J
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