| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem in which load on a communication terminal increases with, for example, the increased number of opposite devices, when the communication terminal for performing encryption communication transmits/receives a key to/from the opposite terminals individually.SOLUTION: The communication system includes: a first communication terminal for encrypting data to be transmitted; a second communication terminal for receiving the encrypted data; and key supply means for sending a key for encryption to the first communication terminal in response to a request from the first communication terminal. The first communication terminal encrypts the data to be transmitted by using the key for encryption which has been sent. The key supply means sends a key for decrypting the encrypted data to the second communication terminal in response to a request from the second communication terminal. The second communication terminal decrypts the received data by using the key which has been sent. |
