Book excerpt: Cyber security is the practice of protecting systems, networks, and programs from digital attacks. These cyber attacks are usually aimed at accessing, changing, or destroying sensitive information; extorting money from users; or interrupting normal business processes.Implementing effective cyber security measures is particularly challenging today because there are more devices than people, and attackers are becoming more innovative. This thesis addresses the individuation of the appropriate scientific tools in order to create a methodology and a set of models for establishing the suitable metrics and pertinent analytical capacity in the cyber dimension for social applications. The current state of the art of cyber security is exemplified by some specific characteristics.