A host communicates with a gateway, a DHCP server or a PPP peer of ISP to determine an IPv6 address, also receives a public key certificate from the gateway, the DHCP server or the PPP peer of ISP, and sends a public key certificate including an IPv6 address to a communication counterpart. The host receives a new public key certificate from the gateway, the DHCP server or the PPP peer of ISP when necessary.

 
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< Method for processing encrypted data for first domain received in a network pertaining to a second domain

> TLS tunneling

> Information communication device, information communication system, and computer program product for transmission control
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