Hello Stefan,
On Wed, 22 Jul 2009 19:36:16 +0200, "Stefan Schmidt" stefan@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