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Efficient key Distribution Schemes for Secure Media Delivery in Pay-TV Systems

Efficient key Distribution Schemes for Secure Media Delivery in Pay-TV Systems. Source: IEEE TRANS. ON MULTIMEDIA, VOL. 6,NO. 5, OCTOBER 2004 Authors: Yu-Lun Huang, Shiuhpyng Shieh, Fu-Shen Ho, and Jian-Chyuan Wang Speaker: LIN, KENG-CHU. Outline. Introduction Preliminary Protocol

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Efficient key Distribution Schemes for Secure Media Delivery in Pay-TV Systems

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  1. Efficient key Distribution Schemes for Secure Media Delivery in Pay-TV Systems Source: IEEE TRANS. ON MULTIMEDIA, VOL. 6,NO. 5, OCTOBER 2004 Authors: Yu-Lun Huang, Shiuhpyng Shieh, Fu-Shen Ho, and Jian-Chyuan Wang Speaker: LIN, KENG-CHU

  2. Outline • Introduction • Preliminary • Protocol • Conclusion

  3. Introduction • Pay-TV systems • Problem in Pay-TV systems. • Channel protection • Goal for this paper: • Correct for authorized • Efficient

  4. Preliminary • CAS (Control Access System) • Member: Service provider, Subscribers • Method: scramble function • Mode: Subscription channel and PPV

  5. Preliminary • Related Work: • Three-level key hierarchyCW, AK, DK • Four-level key hierarchy(1)UK is added.(2)CW, DEK, DK, MPK …1996

  6. Protocol • Four-level key hierarchy • CW,AK,DK,SK • Schemes for subscription channel • Group-oriented key distribution scheme. • Rating-oriented key distribution scheme. • Scheme for PPV • Dynamic key distribution

  7. Si Subscriber dkji randomly choose if Gj SGi otherwise dkji = (dk1 ⊕dk2 ⊕… ⊕dkj) ⊕(dk1i ⊕… ⊕dkji) for GSGi ak1i =D⊕dkji akji =akj-1i⊕dkji Smart Card Protocol-Group-oriented key distribution scheme SP ( Service Provider) <DKSP>=[dk1, dk2,…, dkm] <AKSP> where ak1=D⊕dk1 Akj=akj-1 ⊕dkj Initial Phase

  8. Protocol-Group-oriented key distribution scheme Update Phase

  9. Smart Card Protocol-Rating-oriented key distribution scheme Initial Phase

  10. Protocol-Rating-oriented key distribution scheme Update Phase

  11. SP {GP2}akcurrent {GP3}akcurrent {GP3,akcurrent}sk6 {GP1,GP2,akcurrent}sk7 {GP1,akcurrent}sk4 {akcurrent}sk2 {GP3,akcurrent}sk5 {akcurrent}sk3 S1 S2 S3 S4 S5 S6 S7 GP2 GP2 GP2 GP1 (aknew)sk5 (aknew)sk6 aknew=H(akcurrent,GP2) aknew=H(akcurrent,GP2) GP2,GP3 GP2,GP3 GP2,GP3 GP1,GP3 GP1,GP3 GP1,GP3 GP1,GP2 Protocol-dynamical key distribution for PPV (GP1,GP2,GP3) (GP1,GP2) (GP1) {akcurrent}sk1

  12. Protocol-Analysis m: subscriber groups p: channel groups k: max number of subscribers in each subscriber group in PPV channel q: channel rating

  13. Conclusion • It is not efficient for malicious participant. • Still can be improved • Propose a easy way to arrive part of the goal.

  14. Pay-TV systems

  15. Protocol- NotationGroup-oriented key distribution scheme

  16. Protocol- NotationRating-oriented key distribution scheme

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