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Unmanned aircraft are quickly gaining credibility as an efficient tool for a wide range of tasks. With the increase in the amount of UAVs in the sky, the need for the UAV traffic management arises. Unmanned air traffic management system (UTMS), especially in the urban airspace, could be considered as a critical infrastructure, which-if disrupted-can lead to severe monetary losses and even casualties. As a computerized system, UTMS is susceptible to cyber attacks ranging from cyber vandalism to cyber warfare. This work considers cyber threats to the UTMS, and how it should be designed in order to be resilient to these threats. The work was performed as a part of the early design of an urban UTMS in Singapore; however, the findings are applicable to designing UTMS for any urban environment.

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