| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To easily manage encryption keys in communication using a VPN between communication terminals connected to different repeaters. <P>SOLUTION: At a given time before a currently in-use encryption key is going to expire, a relay device 20 which operates as a key server, generates a new encryption key, registers the new encryption key with a distributed database, and then distributes the key to other relay devices 20. Meanwhile, at a given time before the currently in-use encryption key is going to expire, the other relay devices 20 at various hubs search for the new encryption key in the distributed database and acquire the new key. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
