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

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... s 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.