Obligation as the basis of integrity specification

It is suggested that the notion of obligation found in modal logic can be used as the fundamental notion in formally specifying integrity. Integrity as represented by Clark-Wilson-type models is discussed. It is argued that the essential part of their model, for the purpose of formal specification, is an expression of required connectivity in a graph representing integrity subjects. A review of knowledge logic is given, followed by a discussion of a logic of security that contains operators for knowledge and obligation. A formal semantic definition of integrity based on operator nets is given.<>