Research On Secure Network Coding Technology Based On Single Source Multicast Networks

With the continuous development of network communication technology,the demand for data transmission is increasing day by day.How to transmit data more effectively and quickly under the condition of limited network resources has become an urgent problem to be solved.Different from the traditional "storage-forward" routing and forwarding mode of intermediate nodes in communication networks,network coding can improve the throughput and robustness of the network because it allows intermediate nodes to encode the received packets linearly or nonlinearly.The actual use of network cannot be separated from its security as the premise,but because of the information fusion characteristics of network coding,the traditional network security scheme can not be directly applied to the network coding system,which limits the further development of network coding.Therefore,the current research focus is to solve the problem of network coding pollution attack,design a reasonable pollution detection scheme.In this thesis,two secure network coding schemes are proposed to combat pollution attacks in the single-source multicast network environment based on different verification ideas.The specific work is as follows:This thesis first proposes an improved secure network coding scheme based on linear subspace signature.This scheme introduces new encryption parameters into the secure network coding scheme based on linear subspace signature,and integrates linear subspace signature with an adaptive verification mechanism.The simulation results show that compared to the original scheme,the improved scheme has similar efficiency in signature generation and verification,but it greatly improves the efficiency of intermediate node verification while improving security,and is more suitable for practical network environments.Then an improved secure network coding scheme based on homomorphic signature is proposed.After analyzing the advantages and disadvantages of the secure network coding scheme based on homomorphic signature,a hybrid secure network coding scheme based on homomorphic signature and homomorphic message authentication code is proposed,Homomorphic signature and homomorphic message authentication code are used to jointly verify the packets received by the node.The simulation results show that compared to the original scheme,it can not only resist pollution attacks,but also resist replay attacks and label pollution attacks.