APPLICATION OF ASYMMETRIC DIGITAL SIGNATURE SCHEME TO BROADCAST SYSTEM

摘要

Methods and devices that implement asymmetric cryptographic system based digital signatures to the management of message tampering and assurance of message integrity in an access control system of digital broadcast services. The receiver terminal authorization data messages (124) from the broadcast subscriber control system (110) are digitally signed by a digital signature scheme (114) utilizing a broadcast private-public digital signature scheme key pair. The receiver terminals (115) of the broadcast network (118) receive these authorization data messages (124). The digital signature of each authorization data message is tested for authenticity with the public key of the broadcast subscriber control system (110).