关键词：无线传感器网络；多元；椭圆曲线密码；HFE方案
摘 要：In this paper, the energy consumption of Hidden field equation (HFE) multivariate scheme in wireless sensor networks (WSN) has been evaluated. Security provisioning in WSN requires balancing between two conflicting goals - security strength and resource efficiency. Most of the cryptosystems with security strength required in a WSN are highly resource intensive. Cryptographic operations consume processor power, time and memory space for storage of intermediate and final output. The cryptographic bits also constitute communication overhead that induces delay and decreases the effective throughput. To lessen the load on the resource constrained WSN without compromising security, HFE multivariate scheme is proposed. HFE is a multivariate cryptosystems in which linear equations are solved to obtain successive sets of central variables. The small number of operations and limited memory requirements make this scheme a potential candidate for security provisioning in WSN. Analysis and simulation results show that the scheme can be implemented on resource constrained sensor nodes. Moreover, the decrease in throughput and increase in delay due to HFE scheme are within the tolerable limits of WSN applications.