With wide application of email , it offers people great convenience in work , study , and life . unfortunately , spams begin to be the carrier of business advertisements , the malicious programs or some sensitive mails at the same time , which fiercely threaten the safety of the computer systems , and the lives of people . therefore , anti - spam problem has become an international , significant and practical topic now 电子邮件的广泛应用,极大地方便了人们的工作、学习和生活,但随之而来的垃圾邮件作为商业广告、恶意程序或敏感内容的载体,也越来越对系统的安全和人们的生活造成了严重威胁,反垃圾邮件问题已经成为全球性的具有重要现实意义的课题。
The system not only sends filter rules to every msp ( mail service provider ) ’ s spam filter system , but also accepts spam samples from the spam filter systems of msp . because of the share of filter rules and filter policies , it can reduce total cost of anti - spam system 它一方面可以将邮件过滤规则下发给各邮件服务提供商msp ( mailserviceprovider )的反垃圾邮件系统,一方面可以接收来自各msp的反垃圾邮件系统提供的垃圾邮件样本,以实现规则、策略的共享和降低反垃圾邮件的整体成本。
This dissertation introduces e - mail technology , the definition and the harm of spam , common anti - spam technique and its feature . considering the feature of chinese mail , the techniques required in chinese spam filtering engine was studied , a chinese anti - spam engine based on automatic text categorization technique was designed and implemented . the dissertation discussed the overall architecture of this engine , the design of pre - manage model , the design of training model , the design of classification model , as well as relative techniques 本文介绍了电子邮件技术、垃圾邮件的定义及其危害,常用的反垃圾邮件技术及其特点,结合中文邮件的特点,研究了中文垃圾邮件过滤引擎所需的各种技术,设计并实现了一种基于自动分类的中文垃圾邮件过滤引擎,讨论了该引擎的总体结构,邮件预处理模块设计、训练模块设计、分类模块设计等相关技术问题,并就各模块的实现方法进行了研究。
The paper discussed the following four points : the security of java , the implemention of mvc pattern and the principle and implemention of the send and incept of e - mail based on java ; the principles and implemention of smtp , pop3 and imap , and the characteristic of the e - mail server sendmail , qmail and postfix ; the principles and implemention of symmetrical encryption and unsymmetrical encryption technology , and the advantages and disadvantages of them ; the characteristic of rubbish e - mail , and the principles and implemention of anti - rubbish e - mail technology 本文研究的主要内容包括: java技术安全性, java对mvc模式的实现,以及java技术解决电子邮件发送和接收问题的原理和实现方法;电子邮件相关协议smtp , pop3和imap的原理和实现方法,以及电子邮件服务器sendmail 、 qmail和postfix的特点;对称加密与非对称加密技术的原理和实现方法,以及两者的优点和缺点;典型垃圾邮件的特征,以及反垃圾邮件技术的原理和实现方法。
