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Network operators and service providers are interested in mobile networks due to the number of new services that can be deployed using the infrastructure of the embedded network. Probably, the most attractive service is the seamless Internet connectivity offered by NEMO, the network mobility protocol. Such service would allow passengers to benefit from a seamless Internet connectivity while they are on board of a vehicle. However, in order to deploy these kind of commercial services, an AAA system that responds to the requirements and constraints of mobile networks must be designed beforehand. In this paper, we describe a single sign-on AAA framework based on Kerberos that takes in consideration the specificities of mobile networks.