Authors: Y.L. Huang, S.P. Shieh, F.S. Ho, and J.C. Wang

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Presentation transcript:

Efficient Key Distribution Schemes for Secure Media Delivery in Pay-TV Systems Authors: Y.L. Huang, S.P. Shieh, F.S. Ho, and J.C. Wang Source: accepted for publication on IEEE Transactions on Multimedia Data: 2003/06/19 Speaker: Iuon-Chang Lin

Service Provider /Broadcaster (SP) Set-top-box (STB) Service Request Service Response Customer Service Provider /Broadcaster (SP) Television Subscription channel : a subscriber subscribes a channel for a period of a time. Pay-per-view channel : a subscriber pays for each single program

Key Distribution Scheme for Subscription Channel Protection Goal : only authorized subscribers can descramble the programs correctly Four-key Hierarchy : CW: Control Word AK: Authentication Key AK={ak1, ak2, … ,akm} DK: Distribution Key DK={dk1, dk2, … ,dkm} SK: Secret Key

Subscription Channel Groups G1ABC G2BBS G3ESPN G4HBO G5Discovery G6 Sunmovie . . . SG1: {ABC, HBO, Discovery} SG2: {BBC, Sunmovie, Discovery} SGn: {ESPN, HBO, Discovery} AK1, DK1 AK2, DK2 AKn, DKn SG1={G1, G4, G5} AK1={ak1, ak2, ak3, ak4, ak5, ak6} DK1={dk1, dk2, dk3, dk4, dk5, dk6}

Subscription Channel Based Protocol-Initial Phase ak1=Ddk1 ak2=ak1dk2 ak3=ak2dk3 ak4=ak3dk4

Subscription Channel Based Protocol-Update Phase

Key Distribution Scheme for Pay-Per-View Channel Protection Three-key Hierarchy : CW: Control Word AK: Authentication Key AK={ak1, ak2, … ,akm} SK: Secret Key

PPV Based Protocol

Comparisons (1) Comparison in terms of number of message transmissions M: # of subscriber groups P: # of channel groups K: max # of subscribers in each subscriber group in PPV channel

Comparison in terms of computational cost Comparisons (2) Comparison in terms of computational cost M: # of subscriber groups P: # of channel groups K: max # of subscribers in each subscriber group in PPV channel

Conclusions