Tamper resistance: a cautionary note
WOEC'96 Proceedings of the 2nd conference on Proceedings of the Second USENIX Workshop on Electronic Commerce - Volume 2
Efficient key distribution schemes for secure media delivery in pay-TV systems
IEEE Transactions on Multimedia
Conditional access system interoperability through software downloading
IEEE Transactions on Consumer Electronics
Pay-TV system with strong privacy and non-repudiation protection
IEEE Transactions on Consumer Electronics
A scalable key distribution scheme for conditional access system in digital pay-TV system
IEEE Transactions on Consumer Electronics
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In 2004, Huang et al. proposed a new key distribution scheme for media delivery in Pay-TV Systems based on a four-level key hierarchy. A three-key distribution scheme is proposed in Huang et al.’s paper. They use an exclusive-OR operation and a one-way hash function for key distribution in order to reduce the computational cost. One of the key distribution schemes for subscription channel protection, the group oriented key distribution scheme, however, is inefficient for the digital multimedia broadcasting (DMB) service in resource-limited mobile phones. In this paper, we show that Huang et al.’s scheme is inefficient regarding subscription channel protection. As a result, we propose an improved scheme to reduce this inefficiency by applying a two-level key hierarchy method for a resource limited device, such as the DMB service in mobile phones.