Research On Secure Data Query Protocols In Two-Tiered Wireless Sensor Networks

With the application and development of wireless sensor networks, all kinds of data query have been transplanted to two-tiered wireless sensor networks,.the secure performance requirements also getting higher and higher. For simple data query, like range query, secure research is more widely, but the energy consumption is still too high; moreover, for complex data query, we need to introduce secure mechanism.In this paper, we study the existing threat modes, secure technologies, and secure strategies of two-tiered wireless sensor networks. In view of range query, we give low power consumption and high secure protocol; another protocol about which can protect data privacy security for skyline query is proposed too.For range query, to the disadvantage of high power consumption in existing secure protocol, we propose a secure protocol:SPQ, which is based on the technology of prefix member verification and spatial neighborhoods validation. SPQ uses the technology of prefix member verification to guarantee data privacy; through changing the query data transport strategy to reduce the communication cost; Finally SPQ uses spatial neighborhoods validation to preserve data integrity. And on this basis, we expand SPQ from one-dimensional data query to multi-dimensional data query; SPQ can maintain linear growth of power consumption when network data increase with the growth of dimensions. Through theoretical analysis, SPQ has high security; the simulation experimental results show that SPQ has lower power consumption by contrast with existing one-dimensional data query or multi-dimensional data query. Especially compared to one-dimensional data query, its power consumption declines obviously.For skyline query, there is little secure protocol about skyline in two-tiered wireless sensor networks. This paper firstly proposes a secure skyline query protocol:SSLine based on threshold filtering technology of Z-O encoding data sets. SSLine can enhance query efficiency by threshold filtering technology; meanwhile, Z-O encoding data sets technology can guarantee the storage node to complete query operation securely. Through theoretical analysis, SSLine of two-tiered Sensor Networks has superior performance in terms of guarantee data privacy; the simulation experimental results show that, comparing with other skyline query protocols which have no secure strategy, SSLine has tolerance range on energy consumption.