Hello Stefan,
On Wed, 22 Jul 2009 19:36:16 +0200, "Stefan Schmidt"
<stefan(a)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(a)mirider.augusta.de