关键词: 网络编码, 限定节点, 签名, 网络安全

Abstract: The existing network coding research focuses on the increase of the transmission efficiency of information on the network yet ignoring the informations overflow in the transmission caused by the network coding, which poses a threat to information security and even all message in the networks can be revealed by network nodes. In order to solve this problem, a new method was designed. Based on the different number of information nodes needed to check in different network environments, there are two solutions: one is only a few nodes, using the public key signature of receiving information node, can check information. Meanwhile only the nodes with the private key corresponds to the public key can decrypt and get information. The other one is communication between multiple nodes. In order to avoid that the node with no permission checks information, session keys should be established between communication nodes and be used to transfer the information. The new scheme limits the nodes to check the information though the authority, and consequently ensures the security of information in the network. The usage of network coding in new scheme effectively improves the efficiency of information transmission while assuring the safety of transferring information in the network.

Key words: network coding, limit the nodes, signature, the security of internet