DefinePK

Abstract

In the revocation scheme for stateless receivers, the center delivers information securely to the authorized users over a public channel, where the receivers do not update their state from session to session. This paper presents a view of multimedia Conditional Access Systems (CAS) one-way broadcasting and suggests a new approach. The proposed approach is an efficient revocation scheme for stateless receivers. It reduces the number of private keys used in traditional CAS and number of encryptions as it does not need to encrypt the ciphering keys. Furthermore, the presented approach eliminates the proposed key refreshment presented in (Zhang, Yang, Liu, Tian, 2009) and (Koo, Kwon, & Kim, 2005). The researchers applied the proposed system using AES algorithm. A numerical example is used to demonstrate the effectiveness of the presented approach.