The purpose of this paper is to discuss embedded security, specifically for automotive sector. Most modern cars will have indirect Internet connections to safety-critical control systems. The proposals for using wireless roadside transmitters to send real-time speed limit changes to engine control computers, the use of Vehicle-to-Vehicle communications, are some obvious examples. Internet connections expose applications to intrusions and malicious attacks; security techniques developed for enterprise and desktop computing might not work for embedded application requirements. In this paper we discuss about existing security protocols used in modern vehicles. The detail discussion section of this paper provides information about modern automotive security protocols. The background section of this paper discusses about existing research work in embedded security area. The paper concludes with future research directions.