Research On Secure Network Coding Technology

Compared with the traditional direct store-and-forward routing method,the network coding allows the intermediate nodes of the network to participate in coding,which can improve the network throughput,robustness,security and so on.However,the traditional network-based security mechanism based on routing method is not applicable to the network coding technology-based systems,so the security problem based on network coding gradually attracted the attention of scholars.In this paper,we focus on the single source multicast network to study the problem of pollution attack.The main work of this paper includes the following aspects:A network coding homomorphic signature scheme against intergenerational pollution attack is proposed.Since the signature function is homomorphic,the intermediate node can generate valid signatures on the output packet without knowning the key.The theory and simulation show that this scheme can not only resist the generation of pollution attack,but also can attack the inter-generation pollution attack,But the computational cost is only equivalent to RSA-based signature scheme.Then,A pollution node localization mechanism is proposed.In order to prevent the pollution node from denying the pollution packet,a non-repudiation transmission mechanism is introduced,which can effectively identify the pollution nodes and determine the source of the data packets.The results show that the mechanism can locate the pollution nodes effectively and the computation cost is low.At last,A lightweight security network coding scheme is proposed.This scheme only encrypts a small number of encoding vectors,which reduces the cost of encrypting packets,decrypting packets and reencoding packets.Simulation results show that this scheme can effectively improve the coding efficiency of security of network coding based on homomorphic encryption system..