| 摘要 |
In a case where another user's communication terminal (nTE113) departs from a group, user's communication terminal (TEb14) updates encryption information, using the terminal individual information of only the communication terminals (nTE213 and nTE313) which remain in the group (PNy). User's communication terminal (TEb14) encrypts the PN-shared key (KPNy), using the updated encryption information. User's communication terminal (TEb14) transmits the encrypted shared key information obtained from this encryption to a management device (PNSP11), and updates the encrypted shared key information stored in the management device (PNSP11). |
