Secure E-mail System

With the popularization and construction of the infrastructure of Internet, domestic Internet users present the index to increase. The E-Mail is as one of the most important application of Internet, there is domestic growth in order to become the geometry multiple of every year of E-Mail user of statistics, E-Mail becomes people get in touch with main tool of communication one of while being daily already.At the same time the development of the E-Mail system faces such puzzlement of a great deal of secure problems as secret leaking , information deception , virus invading and harass, junk email,etc. at present. People's requisition for E-Mail system and service improves day by day, among them the secure demand is particularly outstanding . The E-Mail system should prevent the hacker's attack, will prevent the junk email from overflowing, avoid the letting out of materials content of the sensitive mail at the same time. How to apply the secure practice of information to the ordinary E-Mail system, ensure the security of E-Mail system, stability, high-efficient operation are one of the developing direction of the new E-Mail system. This article has introduced the development of the E-Mail system and subject background at first, analyses the traditional E-Mail system structure and E-Mail agreements. Because three kinds of infringement exist when used in the traditional E-Mail –snooping, tampering and forgery, has formed the secure system standards of mails gradually in the world, two big class popular secure mail system standard whether Pretty Good Privacy(PGP) and Secure/Multipurpose Internet Mail Extensions (S/MIME) among them. This article to PGP, the S/MIME two kind of mails securities standards make the analysis. Simultaneously in order to prevent the mail is monitored in the transmission process, we studied the standard of Secure Socket Layer (SSL/TLS), SSL have established an encryption channel above TCP, passed through the encryption through this data, therefore achieved the security the effect. OpenSSL was a SSL V2, SSL V3, TLS V1 integrity realization, the interior has contained the massive encryption algorithm procedure.Its order line has provided the rich encryption, the confirmation, function and so on certificate production. At the same time, it has also provided set of complete storehouses functions, may use the development with the SSL/TLS signal procedure, we also discussed have realized the SSL server procedure using the OpenSSL development library. Then introduced the technological foundation of the security E-Mail system --The...