PACKET PROCESSOR, MOBILE COMPUTER, PACKET TRANSFERRING METHOD AND PACKET PROCESSING METHOD

摘要

PROBLEM TO BE SOLVED: To reduce the overhead of packet processing by deciphering/re- ciphering only a packet processing key without processing with respect to the data part of a transferred ciphering packet and the packet to a destination computer. SOLUTION: Data packet ciphering gate ways 4a and 4c for ciphering communication between a control computers are intalled at networks 1a and 1c. Similarly, a mobile computer 2 is also provided with a packet encoding function similar to the gate ways 4a and 4c. Then, the computer 2 setting inside the network 1a to be a home position moves and cipher-communicates with the communication opposite host 3 of the network 1c. A home agent 5 within the home network 1a is in charge of the position information management and the packet routing of the computer 2 and receives position information from the computer 2. Then a data packet setting a present position to be a transmission destination is transmitted by being capsulated.