Research On Key Technology Of Networkcontent Filtering Based On NDIS Intermediate Driver

Nowadays,the network has become an indispensable part of people.The rapid development of Internet technology makes people access information in the virtual network world more and more convenient.At the same time,the network information becomes more and more complicated,and the harmful information increases sharply.Network security situation has become increasingly severe.Network content filtering technology can filter out unhealthy information on the Internet in order to solve the problem of bad speech,unhealthy information and malicious content,which are caused by the rapid development of the Internet.The network content filtering technology can filter the unhealthy information on the Internet,Carry on the keyword scanning,detect whether contains malicious content,thus reasonably regulate the network resources,achieve the purpose of improving network security.However,the growing network size and large network traffic for the network security has brought great challenges.This paper focuses on the network content filtering technology,through the network information content of the legitimacy of the review to prohibit network users access to unhealthy network information.This paper studies and designs a network content filtering system based on NDIS intermediate driver.The system adopts the method of link layer to intercept data packets.NDIS is the standard of Windows network driver interface.It crosses the transport layer,network layer and data link layer of OSI seven layer model,and can intercept all the data packets flowing through the network card;then the data packet to the protocol restore processing,after layer-by-layer to extract the data of the application layer for the subsequent network content filtering match.In addition,this paper proposes an efficient pattern matching algorithm,which improves the matching efficiency and have efficient performance.The system with this algorithm filters the extracted application layer data to improve the efficiency of the network content filtering system.In order to verify the effectiveness of the system and algorithm designed in this paper,the system is tested on the Windows platform and verified by experiments.It shows that the network content filtering system designed in this paper runs well on Windows platform and can be well completed the filtering of the bad information content,the matching efficiency has been improved.