You Can Access But You Cannot Leak : Defending against Illegal Content Redistribution in Encrypted Cloud Media Center

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

3 Scopus Citations
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  • Leo Yu Zhang
  • Jian Weng
  • Zihao Shan

Related Research Unit(s)


Original languageEnglish
Journal / PublicationIEEE Transactions on Dependable and Secure Computing
Online published10 Aug 2018
Publication statusOnline published - 10 Aug 2018


The wide adoption of cloud greatly facilitates the sharing of explosively generated media content today, yet deprives content providers' direct control over the outsourced media content. Thus, it is pivotal to build an encrypted cloud media center where only authorized access is allowed. Enforcing access control alone, however, cannot fully protect content providers' interests, as authorized users may later become traitors that illegally redistribute media content to the public. Such realistic threat should have been seriously treated yet is largely overlooked in the literature. In this paper, we initiate the first study on secure media sharing with fair traitor tracing in the encrypted cloud media center, through a new marriage of proxy re-encryption (for secure media sharing) and fair watermarking (for fair traitor tracing). Our key insight is to fully leverage the homomorphic properties residing in proxy re-encryption to embrace operations in fair watermarking. Two protocols are proposed for different application scenarios. We also provide complexity analysis for performance, showing that our work can also be treated as secure outsourcing of fair watermarking, and thus kills two birds with one stone. We thoroughly analyze the security strengths and conduct extensive experiments to validate the effectiveness of our design.

Research Area(s)

  • Access control, access control, Cloud computing, Cryptography, Encrypted cloud media center, Media, proxy re-encryption, traitor tracing, Watermarking, watermarking

Citation Format(s)