关键词: 无线传感器网络, 数字签名, 公钥加密体制, 广播认证, 用户撤销

Abstract: Since the broadcast authentication of public-key cryptography based on digital signatures in Wireless Sensor Network (WSN) costs large amounts of energy, and the sensor nodes have limited resources, so a broadcast authentication scheme based on mutual cooperation of sensor nodes was proposed to save the energy consumption of sensor nodes and speed up the digital signature authentication of sensor nodes. First of all, a user broadcasted his signature information into the group network of WSN, but did not broadcast the y-coordinate of the point in the signature. Then, according to the x-coordinate of the point and elliptic curve equation, the high-energy nodes in group network computed the y-coordinate and broadcasted it to the normal nodes in the group; at the same time, using vBNN-IBS (a variant of Bellare-Namprempre-Neben-Identity-based Signature) digital signature, the high-energy nodes authenticated the signature information broadcasted by user and rebroadcasted the effective signature information. Finally, after receiving the y-coordinate, the normal nodes in group network utilized elliptic curve equation to verify the correctness and reliability of y-coordinate, and implemented the same signature authentication as the high-energy nodes, and then rebroadcasted the effective signature information. In addition, the proposed scheme minimized the length of Authorization Revocation List (ARL) by integrating immediate revocation and automation revocation. Simulation results show that compared with another improved vBNN-IBS scheme accelerated by using mutual cooperation of sensor nodes, the energy consumption and the total certification time of the proposed scheme decreases 41% and 66% respectively when the amount of data packets received by the authentication node from its neighbour nodes is up to a certain number.

Key words: Wireless Sensor Network(WSN), digital signature, Public-Key Cryptography (PKC), broadcast authentication, user revocation