  Infrastructure networks are vulnerable to both cyber and physical attacks.
Building a secure and resilient networked system is essential for providing
reliable and dependable services. To this end, we establish a two-player
three-stage game framework to capture the dynamics in the infrastructure
protection and recovery phases. Specifically, the goal of the infrastructure
network designer is to keep the network connected before and after the attack,
while the adversary aims to disconnect the network by compromising a set of
links. With costs for creating and removing links, the two players aim to
maximize their utilities while minimizing the costs. In this paper, we use the
concept of subgame perfect equilibrium (SPE) to characterize the optimal
strategies of the network defender and attacker. We derive the SPE explicitly
in terms of system parameters. We further investigate the resilience planning
of the defender and the strategic timing of attack of the adversary. Finally,
we use case studies of UAV-enabled communication networks for disaster recovery
to corroborate the obtained analytical results.
