- cypherpunks-legacy - lists.cpunks.org

More of Ben's blinding
by Jason Holt 11 Jun '02

11 Jun '02

> But actually another solution is much simpler, which is to do blinding > as just h * g^b, without a y factor. That works fine as long as the > bank is known not to be misbehaving. Ben's paper shows how the bank > can use a ZK proof to show that it is raising to the same power k every > time, basically again that same ZK proof regarding discrete logarithms. > If the bank uses such a proof then you can use simpler blinding without > a y factor, and you can recover the signature on the product of your h > values by dividing by g^k^(sum of b's). Somewhere I got the idea that that was patented, but looking at undeniable signatures, they're actually much closer to (h^y)(g^b), so your suggestion should work great. Thanks! Anybody know of other patents which might get in the way? I'm worried about Chaum's blind signature and undeniable signature patents, and want to present as patent-free a system as possible. One more thing. If the issuer returns the signature: (h1*g^b1 *h2*g^b2 *h3*g^b3...)^k Can I separate out any of the h^k values? My system relies on that being hard. If I replace h1 with (g^b0) and get the issuer to sign: ((g^b0)*g^b1 *h2*g^b2 *h3*g^b3...)^k I should be able to divide the two results and get h1^k. But part of the cut-and-choose protocol will be to require that the n/2 checked documents are all valid and different from any previous instances of the protocol. So it should be extremely hard for the user to sneak lots of previously used values and fake h's (which are really blinding factors) into the unrevealed documents. But are there other ways to separate out signatures on individual h's? -J

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by megper＠mail.ru 11 Jun '02

11 Jun '02

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CBS News | What Was Terror Suspect Up To? | June 10, 2002 22:53:58
by Jim Choate 11 Jun '02

11 Jun '02

http://www.cbsnews.com/stories/2002/06/10/attack/main511671.shtml -- -- ____________________________________________________________________ When I die, I would like to be born again as me. Hugh Hefner ravage(a)ssz.com www.ssz.com jchoate(a)open-forge.org www.open-forge.org --------------------------------------------------------------------

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A Special Note for the Builder Buzz Community
by Customer Service 11 Jun '02

11 Jun '02

Dear Builder Buzz Members: As you know, Builder.com has undergone a major redesign in the past month. And you've probably noticed that Builder.com's discussions have moved to a new message board system (and we've stopped accepting new registrations for Builder Buzz). We've received many requests to keep the Builder Buzz message boards open in addition to our new discussions on Builder.com. And we definitely want keep Builder Buzz online, since it's been one of the strongest, most vibrant communities in the history of CNET forums. However in order to cover the costs of continuing to maintain and support Builder Buzz, it's necessary for us to incorporate it into CNET's Quick SiteBuilder (http://cma.zdnet.com/texis/cnetsb/buzzjoin.html?bbid=5db3) a paid Web hosting & e-learning service. So as of today, you can only access the original Builder Buzz message boards and CNET Quick SiteBuilder, complete with Web hosting, advanced site administration tools, and more -- for just $8.95 a month. You can also try the service for 30 days for free (see details below). We understand that this isn't the perfect answer, but the alternative was to close Builder Buzz down and lose everything we've created there. As you're probably well aware, many Web sites are experimenting with a mixture of free and paid content. We will always keep the existing Builder.com content free (including the new message boards) and those who wish to remain on Builder Buzz can elect to join our SiteBuilder service. We hope you'll continue with Builder Buzz and give Quick SiteBuilder a try -- it's a great place for simple or advanced Web production, and includes a complete set of online tools for doing quick sketches and mockups, as well as advanced tools, online reference material and full FTP access. ******** 30 DAY QUICK SITEBUILDER/BUILDER BUZZ FREE TRIAL ********* As a Builder Buzz member, we'd like to extend a special offer 30-day free trial. You can try Quick SiteBuilder's web building and hosting service and get full access to Builder Buzz. Sign up for a 30 day free trial to Quick SiteBuilder and Builder Buzz at: http://cma.zdnet.com/texis/cnetsb/buzzjoin.html?bbid=5db3 ******************************************************************* Thanks for all your support in the Builder Buzz community. If you have any questions, feel free to contact SiteBuilder at: http://cma.zdnet.com/texis/cnetsb/contact.html Thanks, Paul Anderson Senior Editor CNET BUILDER

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Business proposal
by Development for business 11 Jun '02

11 Jun '02

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Interview questions for Stefan Brands
by Anonymous 11 Jun '02

11 Jun '02

pkiforum.com is soliciting questions which they will ask in their interview with Dr. Stefan Brands. Mail suggestions to interviewbrands(a)pkiforum.com. Here is one question submitted: Your technologies could provide for new forms of PKI, credentials, privacy protection, pseudonymity, and digital cash among others. Yet you have aggressively pursued patent protection on your ideas, a relatively uncommon approach among academic cryptographers. David Chaum before you followed a similar strategy of aggressive patenting followed by attempts to commercialize his technologies, which covered many of the same subjects (although generally in a less sophisticated way). His efforts have been a dismal failure, leaving bankruptcy and business collapses in his wake. How do you evaluate your patenting strategy now? Aren't you concerned that you will have a similar lack of success? Would you be willing to consider donating your patents into the public domain in the hopes that they could be exploited by P2P developers and other decentralized, open-source efforts? These are the people who care about privacy, pseudonymity and the other attributes which your technology is so ideally suited to provide. Isn't it possible that this would be the best path to seeing your ideas being put into practice and bringing benefits to society? Thanks very much for your response.

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Business proposal
by Development for business 11 Jun '02

11 Jun '02

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Business proposal
by Development for business 11 Jun '02

11 Jun '02

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Business proposal
by Development for business 11 Jun '02

11 Jun '02

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guaranteed lower house payments 1575332211
by francop＠aol.com 11 Jun '02

11 Jun '02

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