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A novel and efficient unlinkable secret handshakes scheme

A novel and efficient unlinkable secret handshakes scheme. Author: Hai Huang and Zhenfu Cao Source: IEEE Comm. Letters 13 (5) (2009) Presenter: Yu-Chi Chen. Outline. Introduction Huang and Cao’s scheme Conclusions. Introduction. A secret handshakes

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A novel and efficient unlinkable secret handshakes scheme

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  1. A novel and efficient unlinkable secret handshakes scheme Author: Hai Huang and ZhenfuCao Source: IEEE Comm. Letters 13 (5) (2009) Presenter: Yu-Chi Chen

  2. Outline • Introduction • Huang and Cao’s scheme • Conclusions

  3. Introduction • A secret handshakes • affiliation-hiding authentication • firstly introduced by Balfanz et al. • For example, two FBIagents, Alice and Bob, want to discover and communicates with other agents, but they don’t want to reveal their affiliations to non-agents.

  4. Introduction • An unlinkable secret handshakes • provide unlinkability • an adversary cannot link any two different instances of same party. • Given C, to guess C is AB, A’B’, or other. • unlinkabilityhas been widely considered in many applications.

  5. Introduction • Jarecki et al.’s scheme • an unlinkable secret handshakes • not efficient • Huang and Cao presented an unlinkable secret handshake scheme • novel and efficient • Simple, so it can be published in IEEE-CL.

  6. Outline • Introduction • Huang and Cao’s scheme • Conclusions

  7. Huang and Cao’s scheme This figure is copied from IEEE Comm. Letters 13 (9) (2009), page 731

  8. Conclusions • Huang and Cao analyzed this scheme can provide authenticated key exchange security, affiliation-hiding, and unlinkability. • The scheme is more efficient than Jarecki et al.’s.

  9. On the security of a novel and efficient unlinkable secret handshakes scheme Author: Renwang Su Source: IEEE Comm. Letters 13 (9) (2009)

  10. Su found Huang and Cao’s scheme is not secure. • Cannot provide authenticated key exchange security.

  11. This figure is copied from IEEE Comm. Letters 13 (9) (2009), page 731

  12. Security analysis of an unlinkable secret handshakes scheme Author: T.-Y. Youn and Y.-H. Park Source: IEEE Comm. Letters 14 (1) (2009)

  13. Youn and Park also found Huang and Cao’s scheme is not secure. • Cannot provide authenticated key exchange securityand affiliation-hiding.

  14. Receiving vB,thentry find PK where vB=H1(KA, (PK, EA, EB), resp)

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