Abstract:The direct application of network coding is vulnerable to pollution attack. In order to solve this security problem, we propose a network coding scheme to prevent it from pollution based on CRC check code. First, this protocol employs a fast parallel CRC check code and message timestamp to effectively resist pollution attack and replay attack. Secondly, by combining with the homomorphic properties of RSA signature algorithm, we ensure the security of CRC and timestamp. Security analysis and efficiency analysis show that applying network coding, parallel CRC check code and message timestamp together can greatly reduce the computational cost of the node and improve the network throughput.