Lan To Build A Secure E-mail System Based Usbkey

As a main way for the information transmission, the e-mail has been widely used for its convenience and rapidity. The e-mail in the enterprise includes a lot of important information, for example: core secret,technical patent, selling data, financial data, market information etc. How to effectively protect the important data sent by the e-mail and improve the security of the e-mail has become a gradually urgent task.First of all, by studying the relevant materials, the paper finds out the current situation, the demand of the secure e-mail. Secondly, the paper studies the basic principle of the e-mail and relevant protocols, and analyses the cryptography and certification technology. Thirdly, the paper studies USBKEY, and on the basis the paper implements the equipment management, the public and private keys management, user management, algorithm management, and encrypted data etc. Fourth, the paper designs and implements secure e-mail system based on USBKEY in the LAN, which has two-way identity verification function and two-way undeniable function. Finally, the paper analyses the security of the secure e-mail system and summarizes main work, innovation and the future work of the paper.The meaning of the paper is to construct a secure e-mail system based on USBKEY in the LAN. The system provides the functions for e-mail, such as encryption, decryption, digital signature and authentication. These functions provide the security services for the e-mail users, such confidentiality, integrity and identification.