ADS-B is one of the technologies at the forefront of aviation safety, broadcasting information from planes to the ground and other aircraft alerting them of their position, speed and heading. The protocal used is entirely unauthenticated and unencrypted, and malicious actors are able to easily inject false information into this system. Based on my undergradutate dissertation, this talk will discuss the development of ADS-B, the security issues that it has, and the work being done to counteract these problems.