Location-based data encryption for wireless sensor network using dynamic keys

Secure data transmission for the wireless sensor network (WSN) is always an important issue. The technique of traditional authenticated encryption allows a sensor node to generate a ciphertext which can only be decrypted and authenticated by a designated data aggregator. The convertible property further enables the aggregator to announce an ordinary signature for public verification. To alleviate the harm of key exposure, dynamic key systems are especially suitable for implementing in the large-scale deployment environments such as WSNs. Combining the concept of location and the merits of dynamic keys, we propose a location-based data encryption scheme for WSNs. To the best of our knowledge, this is the first concrete construction considering the properties of location and dynamic keys in WSNs. The proposed scheme not only is conversion-free, but also provides unlimited time periods and random-access key-updates. Moreover, we utilize some reduction models to prove the security of our protocol.