| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an encryption communication method that avoids a risk that encryption strength in encryption communication between communication devices having encryption modes with high encryption strength will become low, and makes encryption communication with low encryption strength possible even if the encryption strength is found out only after communication is performed.SOLUTION: An encryption communication method includes a notification step S20, a response step S24, and a communication step S25. At the response step S24, if a server 10 determines that there is not any of encryption modes permitted by its own device in at least one encryption mode reported by a client 20b, the server 10 inquires of a manager 31 whether it is permitted or not to perform encryption communication with the client 20b by use of at least encryption mode in the at least one encryption mode reported by the client 20b. If the server 10 obtains a permission instruction from the manager 31 (S22), it notifies the client 20b of the encryption mode permitted by the manager 31.</p> |
