TECHNIQUES FOR PERMITTING ACCESS ACROSS CONTEXT BARRIER ON SMALL AREA DEVICE USING INPUT POINT OBJECT

摘要

PROBLEM TO BE SOLVED: To provide structure for securely performing a plurality of programs from unrelated vendors by including a context barrier for isolating execution of the programs in small area devices, such as smart cards.SOLUTION: A context barrier performs security checks for checking whether principal and an object are within the same context, or a requested action is authorized for the object to be operated. Each program or a set of programs is performed in a separate context. Access across the context barrier from one program to another program is achieved by using an input point object under a controlled environment.