Video Casting Application Oriented Key Exchange

Within video stateless receivers, a central server should deliver information securely to the authorized users, over a public channel, even if receivers do not update their state from session to session. This is the case of a multimedia conditional access systems based on one way broadcasting. This paper suggests a new approach to assure a secure communication in such environments. The proposed approach is an efficient key exchange scheme for stateless receivers. It reduces the number of private keys used in traditional conditional access systems and the number of encryptions operations as it does not need to encrypt the ciphering keys. Furthermore, the presented approach eliminates the required key refreshment presented in other approaches. We tested the proposed system using AES algorithm. A numerical example is used to demonstrate the effectiveness of the presented approach. This technique can be very useful for small devices, with limited resources and strict power consumption requirements, which are becoming prevalent in multimedia Conditional Access Systems (CAS) one way broadcasting. Keywords-Key exchange; Broadcast Encryption; Conditional Access Systems.