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With the rapid development of Internet , e-mail, its convenient, fast characteristics and welcomed by the majority of network users . Whether individuals, businesses , government and even the military , etc. , are by e-mail to the daily life and work contact . However, due to the existence of the problem of the security of the network , so that the user e - mail information security can not be guaranteed . In particular, most of the current e-mail system are transmitted in the clear , and easy access to the user 's e-mail information , even on message content forgery , tampering makes some people with ulterior motives . E-mail information security issues become increasingly prominent . This paper focuses on the problem of e-mail messages in the e-mail system in the Web - based security . This paper first analyzes the basic principle of the transfer of network information security and in conjunction with the theory , research and explore the principle of e - mail security and related technologies . Based on the analysis and comparison of the existing secure e-mail standard , research and e-mail security issues undeniable , a non-repudiation protocol based on third-party e - mail . Finally, the combination of PGP secure e-mail technology , design the implementation of the security of a Web-based e-mail system . The contribution of this paper is to research and analysis of the existing secure e-mail standard , secure e-mail system problem solve in Web mode . At the same time , the transmission scheme based non- repudiation protocol secure e-mail . This scheme has the sender, between non-repudiation , and enhance the security of e-mail .
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