Siemens Aktiengesellschaft

Wolfgang Bücker

Günther Horn

Wolfgang Gröting

Joachim Kroβ

Maximilian Riegel

Srinath Thiruvengadam

Messages exchanged between a mobile node and a home agent according to a mobile Internet protocol are authenticated using cryptographic methods applied to the messages and which have been agreed on between the mobile node and the home agent.

Method for verifying the authenticity of messages exchanged according to a mobile internet protocol

A user terminal is switched between a cellular network and a worldwide interoperability for microwave access radio network within a telecommunication system. An authentication, authorization and accounting (AAA) server which is designed for use with both of these networks is disposed in the telecommunication system in such a way that user data of the user terminal stored in the AAA server can be accessed from both of these networks, thereby advantageously ensuring uninterrupted switching between the two networks free of loss.

Telecommunication system and method for controlling switching of user terminal between two networks

Cryptographic material is generated for a protocol for the encrypted transmission of media data between a subscriber device and a provider device. A first symmetric key of the subscriber device and the provider device is inserted in a symmetric key protection mechanism of a network protocol of a control layer to establish a communication session between the subscriber device and the provider device. A first time-variable parameter is transmitted from the provider device to the subscriber device. A second symmetric key for protecting the key management protocol is calculated by both the provider device and the subscriber device using a defined function depending at least on the first symmetric key and the first time-variable parameter.

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Neubiberg, Germany

Wolfgang Bücker