Placing the Chinese Walls on the boundary of conflicts - analysis of symmetric binary relations

In 1989, Brewer and Nash presented a Chinese Wall Security Policy model (CWSP); the model exited the whole conference. The intuition is to place Chinese Wall on the boundary of the conflict of interests classes so that information flow among competing companies cannot occur. Unfortunately, later in the same year we pointed out their erroneous assumption that the conflict of interests relation (CIR) is an equivalence relation; and presented an aggressive Chinese Wall Security Policy model (ACWSP) that was based on an analysis of CIR as a binary relation. Based on our relative recent observation that each binary relation induces an equivalence relation, we show that ACWSP can be strengthened by the induced equivalence relation; intuitively the walls are placed on the boundary of induced equivalence classes.