Deep Reinforcement Learning-Based Defense Strategy Selection

Deception and Moving Target Defense techniques are two types of approaches that aim to increase the cost of the attacks by providing false information or uncertainty to the attacker's perception. Given the growing number of these strategies and the fact that they are not all effective against the same types of attacks, it is essential to know how to select the best one to use depending on the environment and the attacker. We therefore propose a model of attacker/defender confrontation in a computer system that takes into account the asymmetry of the players' perceptions. To simulate attacks on our model, a basic attacker scenario based on the main phases of the Cyber Kill Chain is proposed. Analytically determining an optimal solution is difficult due to the model's complexity. Moreover, because of the large number of possible states in the model, Deep Q-Learning algorithm is used to train a defensive agent to choose the best defensive strategy according to the observed attacker's actions.