| 摘要 |
PROBLEM TO BE SOLVED: To efficiently utilize communication resources.SOLUTION: A transmission byte number monitoring unit 117 monitors a first lifetime until a data amount transmitted through a first encryption communication path established between the communication device and a second communication device 120 exceeds a first threshold. The transmission byte number monitoring unit 117 monitors a second lifetime until the data amount transmitted through the first encryption communication path exceeds a second threshold that is larger than the first threshold. An SA processing unit 114 establishes a second encryption communication path different from the first encryption communication path between the communication device and the first communication device 110 when the first lifetime monitored by the transmission byte number monitoring unit 117 has expired. The SA processing unit 114 deletes the first encryption communication path when the data amount transmitted through the second encryption communication path exceeds a remaining data amount of the second lifetime monitored by the transmission byte number monitoring unit 117. |
