The security of automobiles accesses control system is a topic often discussed. Today's vehicles rely on key-fob control modules, to ensure the vehicle is accessible to authorized users only. While most traditional automobile key-fob systems have been shown to be insecure in the past, here comes a game changer. Instead of the regular key-fob system, some car owners will be able to access their vehicle by having their smartphone authenticates as a digital car key.In this talk, we will reveal the research and attacks for one of digital car keys system in the current market. By investigating how these features work, and how to exploit it through different possibles of attack vectors, we will demonstrate the security limitations of such system. By the end of this talk, the attendees will not only understand how to exploit these systems also which tools can be used to achieve our goals.