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Dieter Spaar spaar at mirider.augusta.deHello Stefan, On Wed, 22 Jul 2009 19:36:16 +0200, "Stefan Schmidt" <stefan at datenfreihafen.org> wrote: > > Hmm, if we would calculate with 200 cards we would have ~80 USD costs for them. > Maybe not the baddest thing. Let's wait to what conclusion we come here before > going ahead. A technical solution that let the user handle the registration on > it's own is still my favorit. Sadly we can't estimate how many subscribers we > will get. :) I don't know if you get a better price if you buy such a large amount of the SIM cards, but I would ask. One advantage of handing out SIM cards: You can play with authentication and encryption if you want to. The A3/A8 algorithm in the SIM cards seems to be different from COMP128-V1 (at least with the SIM I tested) so you cannot retrieve Ki. However you could run the authentication in advance and record a few challenge-reponse pairs and use them later. And if you take one Euro as deposit for the SIM, you might get them back or don't care if not. Best regards, Dieter -- Dieter Spaar, Germany spaar at mirider.augusta.de