If you are not suffering any damage due to these breaches, why are you even trying to deter, detect, and respond to them in the first place? PaulM left an interesting comment on my post NORAD-Inspired Security Metrics. For the case of a single breach, or even several breaches, it may be possible for them to happen and be completely undetectable. If your missions are constantly failing because the enemy seems to know your plans, then your suffering a breach you haven’t detected it.”]
Source: https://taosecurity.blogspot.com/2007/07/no-undetectable-breaches.html