Eavesdropping-aware survivable routing in physical-layer secured optical networks

With tapping attacks gradually occurring, optical networks are facing the risk of eavesdropping. To defend against attackers and protect service transmission, physical-layer security is emerging as a new technique for optical networks. From the survivability perspective, the protection and restoration approaches will need to cover not only failures but also security attacks. Therefore, this work studies the survivable routing problem considering eavesdropping risk. After defining the shared eavesdropping risk link group based on the fuzzy comprehensive evaluation theory, the symbiosis protection that allows two kinds of services to be mutually working paths and backup paths is designed. Following the symbiosis protection scheme, a heuristic algorithm with two schemes is proposed. Simulation results show that the algorithm with security first could lower path risks to zero but block more services, and the algorithm with capacity first improves the network capacity by about 37.072% but keeps 32.335% of links at high risk in a path.