传感器节点相互协作的广播认证

针对无线传感器网络（WSN）中基于数字签名的公钥加密体制的广播认证需要耗费大量的能量，以及传感器节点资源有限的问题，为了减少传感器节点的能量耗费和加快传感器节点的认证，提出一种传感器节点相互协作的广播认证方案。首先，用户向无线传感器网络的组网络广播其签名信息，但不广播签名信息中点的纵坐标；然后，组网络中的高能量节点依据点的横坐标和椭圆曲线方程计算得出纵坐标，并将其广播给组内的一般节点，同时利用vBNN-IBS数字签名对用户广播的签名信息进行认证，并转播有效的签名信息；最后，组网络内的一般节点收到纵坐标后，利用椭圆曲线方程验证其有效性和正确性，同时执行和高能节点相同的签名认证过程，并转播有效的签名信息。此外，该方案通过整合立即撤销和自动撤销以最大限度地减小授权撤销列表（ARL）的长度。仿真实验表明，当认证节点收到来自邻居节点的数据包达到一定数目时，该方案的能量耗费和认证总时间比利用WSN中传感器节点间的相互协作来加速vBNN-IBS的签名方案分别减少了41%和66%。

Broadcast authentication using cooperative sensor nodes

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.