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In this paper, we propose a new efficient model for issuing multiple private keys in IBC (identity-based cryptosystem). In our model, the private key of a user is divided into two components: LTK (long-term key) and STK (short-term key). Both are issued separately by different parties. The LTK is issued in a threshold manner by KPAs (key privacy agency). In contrast, the STK is issued by a single authority called KGC (key generation center). A user can efficiently obtain a new private key containing the same identity information by contacting only the KGC and obtaining a new STK. We also give a security proof of the key issuing model and present a new IBE (identity-based encryption) scheme based on our key issuing model.

Many authentication protocols for RFID have been proposed. However, all the protocols seem to fail to simultaneously satisfy both untraceability and forward secrecy, and support distributed database. In this case, we think that a hybrid-based approach which has both properties of static-ID and dynamic-ID based approach may be an alternative solution. In this paper, we show that a hybrid approach can provide untraceability and support distributed database, while providing only a partial forward secrecy.

Routing algorithm problem is one of the major issues to be resolved in wireless sensor network research. This article analyses the best hop routing algorithms which based on the limitations presented of the minimum-hop routing algorithms fully into the wireless sensor network's energy and load to achieve balance in all the optimum network routing. It is certain that the achievement of our research can successfully improve the reliability and stability of the wireless sensor network routing.