E-mail has become the most convenient way to communication with the others in this Internet age. As the Internet's freedom, the security of e-mail becomes increasingly highlighted. To make the development of e-mail healthy and vigorous, we must first solve the security problem, and encryption technology is an important technology to ensure the safety. Encryption technology is not only the most common information and the most basic skills in security technology, but also the most effective One of the core technology. In this paper, with the working principle of the mail system, analyzed the basic principles of data encryption algorithm, described the two DES-RSA hybrid encryption algorithm e-mail encryption and decryption methods, that way, the security of message transmission is safeguarded.
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