Achieving secure data access control and efficient key updating in mobile multimedia sensor networks

MMSN is a new type of wireless sensor networks, which can satisfy the demands of capturing various structures of multimedia data. Due to its better performance in monitoring the target environment, MMSN has already been applied to many fields and scenarios. However, MMSN also faces with various security threatens and data privacy is one issue urgently to be solved. In this paper, we propose an attribute based encryption scheme to guarantee the secure data sharing in MMSN. In our scheme, a user can only get access to the encrypted multimedia data if his private key satisfies with the access structure. We divide the system lifetime of MMSN into discrete time periods and embed the current time period information into user’s private key. When time evolves, only part of the private key has to be updated and the system public parameters remain unchanged. This can reduce the key-updating computation cost and minimize the energy consumption for system parameter transmission when attribute revocation or private key exposure happens. By security proof and efficiency analysis, we prove our scheme is confidential and of higher efficiency, which makes it more appropriate for secure data protection in MMSN.