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The advent of converged environment merged with wireless sensor networks (WSNs) and mobile networks can have the possibility on enabling us to experience variety of ubiquitous applications based on multi-sensor attached smartphones. However, most of current researches are failed to recognise the fact that there are many drawbacks to break through between the heterogeneous networks such as a WSN and mobile network. In this study, the authors propose the authentication and key agreement protocol that efficiently reduces the overall computational and communication costs in the next generation converged network. The enhanced security procedures are operated through the mobile network in order to maximise the lifetime of the sensor networks and to apply the combined capabilities of both networks. The authors show the presented novel design can show the feasibility to minimise the usage of the sensor networks with the battery-powered sensors in comparison with the existing authentication models, and can be deployed under the standard architectures.