Study And Development On Secure Email

With the rapid development of Internet and the constant improvement of various communications equipment, more and more sensitive information are transmitted on Internet. The security of email has become an issue that attracts more and more email users and developers because email is one of the most important methods used for communication on Internet. It is very necessary to develop secure email application to meet the needs of email users according to the import role played by email in enterprise and the situation of lack of secure email application.For this purpose, an email client application with security based on PGP has been developed. It provides the email users security services such as confidentiality, integrity, identification and non-reputation by the combination of providing encryption, decryption, digital signature, verification to the email and key management and web trust.Based on the analysis of the importance of network security and the background of developing the secure email client, the analysis of demand and the design of the system are elaborated. The whole system is divided into access and control of outlook express module, user interface module, security service embedding module, key and trust management module, provision of security service module and configuration module in this dissertation.The exchange message format used by PGP, the implementation and principle of PGP security service and the principle of key and trust management of PGP are set forth. In addition, the implementation of the secure email client is elaborated.Finally, how the secure email client application is utilized to cooperate with the CA based on PKI developed simultaneously is elaborated.