SECURITY ENSURING METHOD AND STRATEGY IN PRIVATE COMMUNICATION

摘要

PROBLEM TO BE SOLVED: To prevent unauthorized use, theft of inner data, alteration, destruction and the like from occurring by disabling cracking act of a third party against a privately operated server which can be used only by limited clients.;SOLUTION: In the case that a client 2 in a CUG requests connection for accompanying a CUG service to the server 1, line connection is made with a port number calculated by using a first function for varying in a certain period of as a port number for CUG of a server 1. In the case of re-connecting the server 1 and the client 2, line connection is made with a port number calculated by using a second function for varying according to a sequence number of service data immediately before line release as the port number for CUG of the server 1. In addition, in the case of reconnecting, if un-connected states continues for a predetermined period of time, line connection is made with a port number calculated by using the first function as the port number for CUG of the server 1.;COPYRIGHT: (C)2004,JPO&NCIPI