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With the advancement in electrical power systems, control engineering, and information and communication technologies (ICT), remarkable efforts have been made to improve the current electrical power grid, resulting in the so-called intelligent grid or the smart grid (SG). The envisioned smart grid heavily relies on ICT to support two-way communication, demand side management, and other critical smart grid operations. In case of an attack in the SG environment, communication link failures may occur. Moreover, an attacker may also compromise the switch within the SG communication network, thus leading to the breakdown of several communication links. Consequently, important information will not be communicated to and from the SG entities like relays, and remote terminal units (RTUs), As a result, cascading failures or blackouts may occur. Identification of these link failures and choosing alternative …