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A traceable threshold signature scheme with multiple signing policies

A traceable threshold signature scheme with multiple signing policies. Authors ： Jun Shao, Zhenfu Cao Source ： Computer & Security, Volume 25, Issue 3 , May 2006, Pages 201-206 Speaker ： Shao-Nung Huang Date 　： 2006/11/15. Outline. Introduction

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A traceable threshold signature scheme with multiple signing policies

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  1. A traceable threshold signature scheme with multiple signing policies Authors ：Jun Shao, Zhenfu Cao Source ：Computer & Security, Volume 25, Issue 3, May 2006, Pages 201-206 Speaker：Shao-Nung Huang Date 　：2006/11/15

  2. Outline • Introduction • Review of Li et al.’s scheme • Review of Lee’s Scheme • The proposed scheme • Security discussions • Conclusions • References

  3. Introduction • (t,n)threshold Signature |A|=n |B|=t Group Signature Verifier

  4. Review of Li et al.’s scheme • Initialization phase • Partial signature generation & verification phase • Group signature generation & verification phase

  5. Initialization phase • Needs a mutually trusted dealer to setup

  6. Partial signature generation & verification phase DC receives and checks partial signature by checking ?

  7. Group signature generation & verification phase DC computes the group signature by The verifier can check the group signature by

  8. Review of Lee’s scheme • Initialization phase • Partial signature generation • Group signature generation & verification phase

  9. Initialization phase • Needs a mutually trusted dealer to setup

  10. Initialization phase

  11. Partial signature generation

  12. Group signature generation & verification phase The verifier can check the group signature by

  13. The proposed scheme • Initialization phase • Partial signature generation & verification phase • Group signature generation & verification phase

  14. Initialization phase • Needs a mutually trusted dealer to setup

  15. Initialization phase

  16. Partial signature generation & verification phase DC receives and checks partial signature by checking

  17. Group signature generation & verification phase DC combines the partial signatures to the group signature The verifier can check the group signature by

  18. Security discussions • Consistency • Unforgeability

  19. Conclusions • Based on the schemes of Li et al. and Lee • We have devised a traceable threshold signature scheme with multiple signing policies.

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