Scanning And Monitoring System Of Illegal Website And Its Services

During the annual meeting of the United Nations Committee on Information, the conception "The Forth Media" was officially mentioned, which means internet and the information highway be building after the newspaper, broadcast, and TV. The net media is expanding quickly since it comes out, in China, the population of those who use the internet to get what they want is growing all the time, there were below 10000 people who knew the internet in 1995, but by the end of 2003, the 13th CNNIC investigation shows that this figure had grown to 79,500,000. Among all these people, nearly 46.2% wish to obtain useful information through this quick and convenient way. All the details upwards tell us that we need more and more through the internet and it indeed helps us to obtain more and more information.As being "The Forth Media", the internet play a important part in our ordinary living, like the other media ways, it somehow affects your judgment, this character makes it still has some wicked ones, some people just use it to commit a crime, however, these things can be a huge trouble for the country and society, how to monitor and control this big problem is the most important thing.There are many ways of the relevant technology of securing content of the internet information, usually, most of the work is discovering bad information from the great amount of data information and then stopping it, in this article, it uses the method of scanning, it can not only intercept any bad data stream effectually, but alsodiscover the illegal website and evil information from the very beginning of them and secure the content of the internet.After a great deal of investigation and analyze about the situations in China now, during the process of the searching, it uses IP address enumerative algorithm to send out request with relevant protocol to corresponding port on each IP. (At present, this method can support HTTP, FTP, SMTP, POP) It receives respond messages which come back from severs of those websites and then analyzes the messages to get the relative information of websites. In this way, we can not only find out all the websites on the Internet, but also can avoid the disadvantage of network congestion and information delay by using the method of monitoring on information flow. In searching websites which provide illegal and deleterious information, a special spider algorithm which self-designed and optimized to this project is used in this system to carry out search of website links. This algorithm can analyze intelligently all of URLs during the search and cancel the course when URLs out of the monitor range. By this means, time of search can be shortened greatly and the efficiency is improved. On the basis of this algorithm, this system provides the function of searching URLs which belong to a certain website. Furthermore, it can recognize keywords, which make up of spaces or some certain special symbols between each character, for a reformative keyword-matching algorithm is used.