A giant step in the modernization and improvement of the quality of aviation operations is the introduction of the aviation system that relies on satellite positioning technology - Automatic Dependent Surveillance − Broadcast (ADS−B. It operates in two modes: ADS-B Out and ADS-B In. ADS-B Out, the core function for communication between the aircraft and air traffic control (ATC), has become a mandatory global standard. ADS-B In, an optional service, allows the aircraft to receive and display detailed information broadcast by other aircraft in the vicinity. ADS-B is designed with the latest technology, making it suitable for retrofitting on aircraft currently in operation. However, ADS–B transmits information over open and unencrypted protocols, so it can be easily compromised using existing hardware and software: ADS–B can be exposed to different types of cyber-attacks, such as eavesdropping, jamming and spoofing. According to ICAO assessments, the risk of a successful cyber-attack resulting in the loss of human life is relatively low compared to other types of terrorist attacks. However, recent incidents have shown a rising number of cyber disruptions affecting airline operations. While these incidents may seem minor, they are occurring with increasing frequency and could lead to more severe consequences.