Hello Johannes,

On Mon, 03 Aug 2009 22:56:08 +0200, "Johannes Schmitz" jsemail@gmx.de wrote:

At this point I have got one general question, maybe also towards Dieter: How can A3/A8 be proprietary by any operator? How does international roaming work then if there is no standardized algorithm?

As far as I know for roaming the foreign network receives a RAND-Kc-SRES Triple from the home network so there is no need to know A3/A8 used by the other operator.

Best regards, Dieter