| 摘要 |
<p>PROBLEM TO BE SOLVED: To allow the communication system to set information for security relating to electronic mails sent/received flexibly. SOLUTION: The encryption system between a pair of nodes of a computer PC(A) of a user A and a computer PC(B) of a user B is set as encryption information tables TB(A) and TB(B) to a servers A, B at the users A, B and collectively managed. A prescribed encryption system between a pair of the nodes in the servers A, B is individually set possibly for revision and the server-side applies encryption/decoding processing to communication data according to the set encryption system.</p> |
