| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an electronic mail server system, that is preconditioned to ensure the security by sending/receiving an encrypted electronic mail between a sender and a recipient and can make transmission reception of the encrypted electronic mail by different encryption methods and algorithm, without the need for unifying the encryption protocol of the electronic mails, according to each mailing list and without the need for preparation of a public key for each of encryption methods and algorithms. SOLUTION: The electronic mail server system is provided with an ML database D1 that stores encryption methods used by recipients, a public key database D2 that stores the public key by each recipient, and a multi-protocol compatible encryption ML server 20 that decodes an encrypted electronic mail sent from a TLS (SSL) compatible mail transmission tool 10, encrypts the electronic mail for each recipient, by using the public key stored in the public key database according to the encryption method stored in the ML database and transmits the encrypted electronic mail to the recipient.</p> |
