Date Added: Feb 2012
Next generation networks will comprise different wireless networks including cellular technologies, WLAN and indoor technologies. To support these heterogeneous environments, there is a need to consider a new design of the network infrastructure. Furthermore, this heterogeneous environment implies that future devices will need to roam between different networks using vertical handover techniques. When a mobile user moves into a new foreign network, data confidentiality and mutual authentication between the user and the network are vital issues in this heterogeneous environment.