| 摘要 |
An IP network communication system which applies encryption with a reduced processing delay caused by a CPU load which is increased by the application of IPsec etc., and with reduced degradation of data transmission efficiency in a network, is provided. The IP network communication system having a security function includes an encryption processing part to encrypt a predetermined area range of one packet to be transmitted, and not to encrypt a residual area of the one packet; and a transmission part to transmit the packet encrypted by the encryption processing part through a tunnel for encryption.
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