Security in Computing 5th Edition by Shari Lawrence Pfleeger, Charles P Pfleeger, Jonathan Margulies

Exercise 6

A real attack involved a network of air defense controllers' computer screens. In that attack, false images were fed to the screens making it appear that the skies were empty when an actual air attack was underway. Sketch a block diagram of inputs, processing, and outputs designers of such a system might have used. Show in your diagram where there are single points of failure. In some situations, we can prevent single-point failures by duplicating a component that might fail. Would such a strategy work in this case? Why or why not? Another counter to single failure points is to triangulate, to obtain different kinds of data from two or more sources and use each data piece to validate the others. Suggest how triangulation could have applied in this case.