This paper describes an authentication scheme to manage various environments of the distributed mobile cloud services. Multiple services provided by the various mobile cloud service providers can be accessed by a mobile user using only a single unique private key. Different algorithms are used for providing mutual authentication and also for key exchange. User anonymity and user untracebility is considered and maintained, which increases the security strength. The bilinear pairing cryptosystem and dynamic nonce generation are the techniques used for maintaining the security strength and is not subjected to time synchronisation problem and it can be easily implemented in a distributed cloud computing environment. The scheme reduces the memory space used on the corresponding service providers. This project aims at combining both the techniques.
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