| 摘要 |
PURPOSE: A method for transmitting and receiving an information protection IP(Internet Protocol) packet is provided to generate and transmit a security packet in an IP layer without having an influence on an application layer service program. CONSTITUTION: A transmission host terminal receives a packet from an application layer(601), and generates an information protection packet in which encryption and authentication information is added in the received packet(602). A data link header is added in the generated information protection packet, and the added information protection packet is transmitted to a gateway through the Internet by a frame unit(603). The gateway receives the transmitted information protection packet, removes the data link header from the received information protection packet, and forwards the removed information protection packet(604,605). In case that a security service is selected, the information protection packet is encoded and decoded according to an AH(Authentication Header) protocol header and an ESP(Encapsulating Security Payload) protocol header, and an information protection packet in which a data link header is added again is transmitted to the Internet(606). A reception host terminal receives the information protection packet forwarded from the gateway, and deletes the data link header from the received information protection packet(607). The reception host terminal checks authentication data according to the selection of the security service, and confirms decoding and authentication information according to the AH protocol header and the ESP protocol header(608). The reception host terminal transmits the received data to the upper application layer(609). |
