Research On Spam Filter System Based On Digital Authentication

With the popular of Internet, the traditional mail service is largely replaced by E-mail service which is provided by Internet. E-mail is becoming more and more of an important means in people's communications. However, with it, the spam also has flooded in. It takes up a large number of network resources, system resources and store resources of the E-mail service provider.Although we devote ourselves to the task of anti-spam by the way of technologies and laws, the spam has been out of our control. Especially in our country many mail server of our country has been becoming the source of spam because of anti-spam technology and policy about spam. The more serious is that abroad ISP blank off IP of our country. So how to filtrate spam properly has become a significant and practical topic.The work was done in this situation, it aims at retrieving clean network. It took a penetrating study on the various present filter techniques. By the study of question and difficulty of situation, a system of filtering spam based on digital authentication was designed. The main content is:1 .We analysis the format, protocols and principles of E-mail system in order to know lifecycle of spam's birth, transmission and its receiving, so we can identify the spam and capture it exactly.2.The research of current situation that the present domestic and international spam filters has been analyzed. In order to filtrating spams effectively, when content filtration, We combined svms and BP network in a very tactful way to achieve excellent learning and generalization performance.3.Present technology and solution can't control the flood of spam on internet. So a new anti-spam solution-Research of spam filter system based on digital authentication was put forward in this paper. The system carried on filtration to the spam which initiative and passive unifies.4.This paper introduced individual credit information database in the mail filtration system. The database records the user's credit information. Through the system restraint, enhances the user's credit consciousness, and urges the user's honest code of honor. So the user will not to transmit the spam.In this filtration system, before send e-mail for local users, the server first carries on the status authentication. If through authentication then for user transmission mail, otherwise refuses to transmit. Thus,the source of spam emails was blocked, so the burden of networks was alleviated, users are freed. When received e-mail ,the server verify its digital certificate too. Then using traditional anti-spam technologies to judge the e-mail. When discovered the spam, the server abolished its digital certificate and marked misconduct in the user individual credit information database for it. When user's credit information is in the low to a certain extent, the system refused to continue to serve for the user.