| 摘要 |
PROBLEM TO BE SOLVED: To provide a communication system wherein important secret data is prevented from leaking by constructing a transmission packet such that it cannot be decoded with an apparatus operating on the basis of an ordinary IP-SEC specification, and processings such as encryption and decryption are speeded up by suppressing an increase of a load of a CPU in the processings. SOLUTION: In a communication system wherein communication is performed using an encrypted transmission packet with an IP-SEC encryption system, the transmission packet is sent after authentication data in an IP-SEC header for decrypting IP-SEC encryption generated by the IP-SEC decryption of the transmission packet. COPYRIGHT: (C)2003,JPO
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