关键词: 异构传感网, 椭圆曲线加密（ECC）, 证书, 不重数签名, 中间人攻击

Abstract: With the development of Internet of things technology which is considerably contributed to the research of Heterogeneous Wireless Sensor Networks（HWSNs）, the design of key management schemes and protocols is one of the most important aspects of HWSNs research. Besides, the key management in HWSNs meets many new challenges due to its intrinsic properties. This paper proposes a Hybrid Key Management Scheme（NHKM） which is based on Elliptic Curve Cryptography（ECC） and symmetric cryptosystem, through the use of the certificate and nonce signature to achieve authentication of the node’s public key, thus well avoid Man-in-Middle（MIM） attack. The simulation results show the overall effectiveness of the NHKM scheme, revealing better performance in terms of resource cost, network connectivity, scalability and resilience.

Key words: heterogeneous sensor networks, Elliptic Curve Cryptography（ECC）, certificates, nonce signature, man-in-middle attack