Harold Gallagher, Wade McMahon and Ron Morrow examine the various sources of cyber attacks and their potential for systemic risk. Against this background, the report highlights efforts being made to protect against cyber-security threats, including individual and collective actions by financial institutions and financial market infrastructures, as well as initiatives by international organizations, regulatory authorities and governments. The authors then describe the coordination, under the Joint Operational Resilience Management program, of private and public sector actions in Canada for managing and testing capabilities during severe operational events such as cyber attacks.