An automatic dependent surveillancebroadcast(ADS-B) system has serious security problems,and the data can be spoofed during broadcasting precise position information of aircraft.A solution of the ADS-B system data authentication based on the elliptic curve cipher(ECC) and X.509 certificate is proposed.It can avoid the key distribution problem by using the symmetric key algorithm and prevent the ADS-B data from being spoofed thoroughly.Experimental test results show that the solution is valid and appropriate in ADS-B universal access transceiver(UAT) mode. An automatic dependent surveillance broadcast (ADS-B) system has serious security problems, and the data can be spoofed during broadcasting precise position information of aircraft. A solution of the ADS-B system data authentication based on the elliptic curve cipher (ECC) and X .509 certificate is proposed. It can avoid the key distribution problem by using the symmetric key algorithm and prevent the ADS-B data from being spoofed thoroughly. Experimental test results show that the solution is valid and appropriate in ADS-B universal access transceiver ( UAT) mode.