A Computationally Efficient and Scalable Key Management Scheme for Access Control of Media Delivery in Digital Pay-TV Sy
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A Computationally Efficient and Scalable Key Management Scheme for Access Control of Media Delivery in Digital Pay-TV Systems Vinod Kumar 1 & Rajendra Kumar 2 & S. K. Pandey 3 Received: 12 May 2019 / Revised: 10 March 2020 / Accepted: 27 March 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract
In today’s Internet era, group communications in multimedia applications are becoming more and more popular. The issues of controlling illegal access to multimedia contents require efficient and secure mechanisms for distribution of common key called scrambling key or group key. In order to provide secure delivery of multimedia contents in digital pay-TV systems, a large number of keying information messages are exchanged for group key/scrambling key updates in the traditional key distribution schemes. In this paper we propose a Chinese Remainder Theorem (CRT) based key distribution protocol which is highly secure and computationally efficient. The proposed protocol, 1) has drastically reduced the computational complexity of Group Manager (GM) and members for updating the keys, 2) has greatly increased the security by using an additional secret parameter at Group Manager and members areas, 3) can efficiently handle large and dynamically updating groups and, 4) can update the group key in one message, without updating member’s key. With our proposed key distribution scheme, only legal members can access the multimedia contents correctly and the illegal access can be prevented. The proposed scheme is applicable in Conditional Access System (CAS) of digital pay-TV systems without increasing storage and communication overheads on GM and members. The comparative analysis of our proposed scheme with existing schemes in terms of computational cost assures the effectiveness of our scheme. As a proof of concept, we implement our scheme to a decentralized architecture-based key management system and demonstrate that the proposed scheme significantly reduces the computational complexity. Keywords Digital pay-TV . Secure multicast communication . Group key distribution . Chinese remainder theorem . Rekeying cost . Storage complexity
* Vinod Kumar [email protected] Extended author information available on the last page of the article
Multimedia Tools and Applications
1 Introduction With the growing popularity of group communications and the rapid growth of the Internet, certain multimedia multicast services like Pay-TV, video conferences, stock quotes, group games, distance learning, etc. require confidentiality during communication [3, 6, 18, 22, 26, 27]. For such kind of group oriented services it is necessary to develop the access control mechanism so that only legal group members can access the multicast communication. In digital pay-TV systems, the members are able to select and purchase their favourite programs. The Conditional Access System (CAS) provides access of selected programs to only authorized members who have paid for the digital pay-TV programs. For these reasons, the problem of illeg
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