New authentication protocol for IP CAS of IPTV

One of greatest achievement in television technology is Internet Protocol Television (IPTV). It is an emerging technology that defines mechanisms to deliver digital television over IP network The security is the most important issue that IPTV service and content providers concern about it. Without it, not only paying subscribers can access content of IPTV but also illegal subscribers. Consequently, the revenues for IPTV industries will drop significantly. In this paper our discussion focused on a technique that used for service protection which is Internet protocol Conditional Access System (IP CAS). A discussion of how this technique is implemented Moreover, we proposed new authentication protocol to improve security and reduce drawback of existing IP CAS. The main motivation to write this paper is to suggest a solution a weakness in IP CAS that its security relies in one key that is not changing for long period of time.