| Summary: | 碩士 === 國立中央大學 === 資訊工程研究所 === 91 === With the popularity of WWW, fast information distribution greatly speed up the aggregation of knowledge. However, a variety of information on Web pages produces an unexpected problem-abusing information distribution, such as adult and violence. The article addresses how to find out adult contents on Internet and to avoid accessing them by a scalable simple approach. Considering the operation of TANet, we propose DNS-based with proxy approaches to filter abusing information. The approaches utilize existing domain name software as a special server. There is no extra load on the filtering system. Also, because of DNS’s cache mechanism, filtering system can make faster blocking decision.
Pornographic web sites appear and disappear everyday, so it is hard to keep the blocking list up-to-date. We use the pornographic web sites’ feature to propose three kinds of update blocking list methods. The first one is ”Monitor DNS traffic analysis”. Some web sites with keywords in their hostnames is the principle. Besides, the pornographic web sites always link each other. So, we proposed the second method - ”Pornographic network group links analysis”. These methods have higher precision over than 90%. And they have less processing time. Now, we have collected more than 100,000 web sites.
Finally, we implemented a prototype to demonstrate our approaches. The system was installed at National Central University in Taoyuan to test its effect. The experiment shows that our system effectively blocks the retrieval to abusing information. Because of the great effect, many other institutions joint to our system and inform us to adopt the system.
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