A system for controlling access to hosted services using computer generated question answer sets is described. The question answer sets are generated and include relationships which are designed to distinguish between human and automated system interpretation through the inclusion of a dynamically established transformation of characteristics in relation to objects described in the question answer sets. The dynamically established transformation provides an additional defense against malicious neural networks used to overcome mechanisms for distinguishing between humans and automated systems. Corresponding methods and devices are contemplated. In an additional embodiment, a decoy set of answer sets are also established to maintain a blacklisted set of suspected automated systems.