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This paper develops a novel compositional and abstraction-based approach tosynthesize edit functions for opacity enforcement in modular discrete eventsystems. Edit functions alter the output of the system by erasing or insertingevents in order to obfuscate the outside intruder, whose goal is to infer thesecrets of the system from its observation. We synthesize edit functions tosolve the opacity enforcement problem in a modular setting, which significantlyreduces the computational complexity compared with the monolithic approach. Twoabstraction methods called opaque observation equivalence and opaquebisimulation are first employed to abstract the individual components of themodular system and their observers. Subsequently, we propose a method totransform the synthesis of edit functions to the calculation of modularsupremal nonblocking supervisors. We show that the edit functions synthesizedin this manner correctly solve the opacity enforcement problem.

Compositional and Abstraction-Based Approach for Synthesis of Edit Functions for Opacity Enforcement