| 摘要 |
PROBLEM TO BE SOLVED: To provide a key escrow system that an investigation agency utilizing a mobile terminal can intercept communication in real time even without a key storage agency adopting the key escrow system. SOLUTION: The key escrow system introduces a proxy server(P) to which a key delivery server(KDS) always distributes a session key for encryption communication between users at the same time. The proxy server(P) stores the encrypted key distributed from the key delivery server(KDS). When the investigation agency (I) commands delivery of a session key with a license or search warrant of a court, the proxy server(P) requests the key delivery server(KDS) to authenticate an investigation agency terminal making the command and to authenticate whether or not a target person is correct. The proxy server (P) delivers the session key encrypted by a public key of the investigation agency (I) to the investigation agency (I).
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