Adam Back wrote: > Related to this announcement, credentica.com (Stefan Brands' company) > has released "U-Prove", their toolkit & SDK for doing limited-show, > selective disclosure and other aspects of the Brands credentials. > > http://www.credentica.com/uprove_sdk.html > > (Also on Stefans blog http://www.idcorner.org/?p=144). > > I believe Brands credentials are considerably more computationally > efficient and more general/flexible than Camenisch credentials.
Not sure about more general. Brands does claim they are more efficient, though - however, Camenisch/Lysyanskya credentials have been improved since they were first thought of, and are also a lot faster if you don't insist on academic rigour. I have not yet put them side-by-side, but I do have a partial implementation of C/L credentials for OpenSSL and am planning a Brands implementation, too. > (Re Hal's comment on the patent status of Camenisch credentials, as > far as I know patents apply to both systems). > > Looks like you can obtain an evaluation copy of U-prove also. > > Adam > > On Sun, Feb 04, 2007 at 10:34:33AM -0800, "Hal Finney" wrote: >> John Gilmore forwards: >>> http://news.com.com/IBM+donates+new+privacy+tool+to+open-source/2100-1029_3-6153625.html >>> >>> IBM donates new privacy tool to open-source >>> By Joris Evers >>> Staff Writer, CNET News.com >>> Published: January 25, 2007, 9:00 PM PST >>> >>> IBM has developed software designed to let people keep personal >>> information secret when doing business online and donated it to the >>> Higgins open-source project. >>> >>> The software, called "Identity Mixer," was developed by IBM >>> researchers. The idea is that people provide encrypted digital >>> credentials issued by trusted parties like a bank or government agency >>> when transacting online, instead of sharing credit card or other >>> details in plain text, Anthony Nadalin, IBM's chief security architect, >>> said in an interview. >>> ... >> I just wanted to note that the idemix software implements what we >> sometimes call Camenisch credentials. This is a very advanced credential >> system based on zero knowledge and group signatures. The basic idea is >> that you get a credential on one pseudonym and can show it on another >> pseudonym, unlinkably. More advanced formulations also allow for >> credential revocation. I don't know the specifics of what this software >> implements, and I'm also unclear about the patent status of some of the >> more sophisticated aspects, but I'm looking forward to being able to >> experiment with this technology. >> >> Hal Finney >> >> --------------------------------------------------------------------- >> The Cryptography Mailing List >> Unsubscribe by sending "unsubscribe cryptography" to [EMAIL PROTECTED] > > --------------------------------------------------------------------- > The Cryptography Mailing List > Unsubscribe by sending "unsubscribe cryptography" to [EMAIL PROTECTED] > > -- http://www.apache-ssl.org/ben.html http://www.links.org/ "There is no limit to what a man can do or how far he can go if he doesn't mind who gets the credit." - Robert Woodruff --------------------------------------------------------------------- The Cryptography Mailing List Unsubscribe by sending "unsubscribe cryptography" to [EMAIL PROTECTED]