| Summary: | 碩士 === 中國文化大學 === 資訊管理學系 === 100 === E-mail is the most important tool of communication now. When users send the mail through network, it must keep safely and avoid threat. The threat has interruption, interception, modification and fabrication. Information security is most important in network environment. Cryptography is important part of security. Because mails may be modified and stolen, we encrypt them before sending.
In this study, we propose a method of symmetric encryption algorithm to encrypt the mail to produce cipher text. We send cipher text to receiver. Using decryption algo-rithm, the receiver decrypts cipher text to get the plaintext of mail. Each mail uses dif-ferent encryption data to be encrypted. The fields of encryption data are randomly set and store in the user information database. It is difficult to find the value. It is more secure to process the mail.
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