| 摘要 |
PROBLEM TO BE SOLVED: To perform the appropriate data inspection of encrypted communication data. SOLUTION: When a transmitting side communication terminal 1-1 and a receiving side communication terminal 1-2 (hereinafter communication terminals) perform encryption communication using an encryption key, a third communication apparatus 1-3 for transferring the communication data interrupts encrypted communication data whose contents cannot be confirmed by network security management criteria. The third communication apparatus 1-3 notifies the communication terminals 1-1 and/or 1-2 that the encrypted communication data are interrupted. After mutual authentication procedures are exchanged between the communication terminals 1-1 or 1-2 that has received the notification and the third communication apparatus, an encryption communication path is generated between both the apparatuses. The encryption key is transmitted from the communication terminal 1-1 or 1-2 to the third communication apparatus 1-3 through the encryption communication path. The third communication apparatus 1-3 uses the received encryption key to decrypt contents of the encryption communication data and performs contents inspection, filtering processing or the like. COPYRIGHT: (C)2005,JPO&NCIPI
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