RESYNCHRONIZATION METHOD OF SYNCHRONOUS INFORMATION SECURITY SYSTEM USING FORCEFULLY CHANGED INITIAL VECTOR VALUES SHARED IN OVERALL SYSTEM

摘要

PURPOSE: A resynchronization method of a synchronous information security system is provided to reduce a time required for resynchronization by using forcefully changed initial vector values shared in an overall system rather than using changed key streams. CONSTITUTION: An initial vector is generated(502) and transmitted(503) to a counterpart system for the systems to share(504) the same data. A security communication between the systems is initialized(505) by using the shared initial vector. When a frame error occurs in wired and wireless communication atmosphere during the security communication, the initial vector shared by the systems is forcefully changed according to a predetermined way to resynchronize the overall system(508). The changed initial vector is used to perform the initialization of the security communication.