| 摘要(英) |
With developments of scientific technologies, the Internet has increasingly made a great impact on the world. The network technology experienced an exciting evolution from dial-up, ADSL, CATV to FTTx and 3G which make it indispensable to people life. According to statistics, the population of Internet user in Taiwan ranked fourth in Asia, just behind Korea, Japan and Singapore. Most of Internet users are the youth including junior and senior high school students. It is hard to ask students’ parents to watch their children go on line. In addition, parents worry about websites and contents which their children visit is appropriate and healthy or not. Thus, how to solve aforementioned problem is becoming an important issue. On the other hand, company managers concern with their employee surfing the Internet which may cause huge losses by infecting viruses or malwares. To avoid these incidents happening, the technique of content-based filtering is a feasible solution. It is possible to reduce the loss, and even avoid effects by filtering inappropriate information, such as phishing, spam, and pornography.
In this paper, we designed and implemented a content-based filter on an embedded broadband gateway. We analyzed and compared various feasible approaches with their advantages and disadvantages. And then, we took into account implementation and chose the most appropriate approach to develop the mechanism. In our filtering proposal, we proposed following functional modules consisted with URL blocker, keyword filter, traffic recorder, sender identifier, porn image recognizer, and timed-access monitor to help users blocking harmful information. Once the filter detected bad contents, the filter generated real time notices to the client and informed users the reason of drop-out and then redirected the browser to normal webpage.
Additionally, user friendly management interfaces were designed. System administrator can easily configure settings and fetch blacklists from Internet, which announced by 3rd parties to enhance filter accuracy. We examined our content-filter mechanism with numerous experiments. The result demonstrated that our proposal significantly improve efficiency of blocking malicious information and reduce hazards of virus affecting.
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