AUTHENTICATION METHOD, SERVER COMPUTER, CLIENT COMPUTER, AND PROGRAM THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide an authentication method which has tolerance against unauthorized access by IP address forgery. SOLUTION: A server computer 1 and a client computer 2 arrange a plurality of port numbers of the server computer 1 shared between each other. The client computer 2 transmits a plurality of connection request packets using each of the decided plurality of port numbers when the client computer 2 sets up connection with the server computer 1. The server computer 1 receives these connection request packets, and checks that these are transmitted to the decided plurality of port numbers; when the server computer 1 decides that the connection request is right, the server computer 1 generates a connection request confirmation packet to one of these connection request packets and transmits the confirmation packet to the client computer 2. COPYRIGHT: (C)2005,JPO&NCIPI