Based On The Java Security Web E-mail System

Since the origination of the E-mail,security continuously has been one of the most concerned issues which developers and users focus on.Base on studying the implemention of E-mail system platform,this paper focuses on two key aspects: encryption and filtration.In the end,the author entrusted the achievement studied to practice and developed a Java-based WEB mail system with high security.The paper discussed the following four points:①The security of JAVA,the implemention of MVC pattern and the principle and implemention of the send and incept of E-mail based on JAVA;②The principles and implemention of SMTP,POP3 and IMAP,and the characteristic of the E-mail server SendMail,Qmail and Postfix;③The principles and implemention of symmetrical encryption and unsymmetrical encryption technology,and the advantages and disadvantages of them;④The characteristic of rubbish E-mail,and the principles and implemention of anti-rubbish E-mail technology.Base on the research metioned above,this paper has put forward a solution for Java-based Web E-mail system with high security,of which the innovation points include:①In the aspect of system structure,the system has adopted MVC pattern two,then adds a permanent level on this basis,which brings the 4-levels structure:denotation level,logic level,operation level,permanent level to be ture,and improved the maintainability of the system.At the mean time,the basic classes of every level are encapsulated,which increases the expansibility of the system;②On the aspect of the security of E-mail,the system adopts double-encryption technology:the first layer adopts DES encryption technology,which makes mail safely transmit in the network;the second layer adopts shift-encryption technology,with which users can encrypt mail on the WEB interface.This is much more convenient and secure than before;③As to filtering garbage E-mails,the system adopts the double-filtration technology,it adopts content-based filtration in the mail server,carries on the filtration of the IP address and E-mail address at the console by looking over the log files in the E-mail server,while using Regular Expression to process the filtration of the HTML...