| With the increasing number of Internet users,there is a serious shortage of bandwidth resources,and the increasing demands of users on network security,how to improve the bandwidth utilization and network security performance of multicast communication has become a research hotspot in the field of communication.Based on the above problems,in the context of multi-source multicast in deterministic networks,a deterministic layered construction scheme and a secure network coding scheme based on chaotic sequence against global eavesdroppi ng and pollution attacks are proposed.The main work is as follows:(1)To overcome the shortcomings of low bandwidth utilization and long convergence time of multi-source multicast,a linear layered construction algorithm is proposed.With only one trial broadcast,the coding coefficients of each coding node can be decoded layer by layer,and the link with data redundancy can be pruned to make the global coding matrix received by the sink end full rank,so as to decode smoothly.The simulation results show that the algorithm can further improve the communication efficiency of multi-source multicast.(2)Aiming at eavesdropping attack and pollution attack in network coding,a secure network coding scheme based on chaotic sequence is proposed from the point of view of cryptography.Firstly,the Logistic chaotic sequence is used to encrypt the last dimension data of the original message,and the global encoding matrix is constructed by using the m sequence to the chaotic sequence perturbation,Secondly,the original encrypted information is linearly combined with the global encoding ma trix for transmission,and the sink node constructs a linear list to filter the contaminated information.The analysis shows that the scheme can improve the security of the network,resist global eavesdropping and filter out the polluting information,improve the transmission efficiency of the network.This paper has 27 figures,2 tables and 67 references. |
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