The advancements in air navigation technologies surely help drive business, however the increasing connectivity has made them more vulnerable to cyber-attacks. Due to the negative impact of cyber-attacks on aviation safety, economy, and reputation, cybersecurity is considered as urgent and emerging issues in aviation generally, and in air navigation in particular. This session will provide you with examples of the potential cyber hazards in the critical elements of ANS, communication, navigation and surveillance systems. Furthermore, the various counter-measures that can be used to mitigate these threats to have cyber resilience aviation system.