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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

A novel and efficient unlinkable secret handshakes scheme

Author: Hai Huang and ZhenfuCao

Source: IEEE Comm. Letters 13 (5) (2009)

Presenter: Yu-Chi Chen


Outline
Outline

  • Introduction

  • Huang and Cao’s scheme

  • Conclusions


Introduction
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.


Introduction1
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.


Introduction2
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.


Outline1
Outline

  • Introduction

  • Huang and Cao’s scheme

  • Conclusions


Huang and cao s scheme
Huang and Cao’s scheme

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


Conclusions
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.


On the security of a novel and efficient unlinkable secret handshakes scheme

On the security of a novel and efficient unlinkable secret handshakes scheme

Author: Renwang Su

Source: IEEE Comm. Letters 13 (9) (2009)


A novel and efficient unlinkable secret handshakes scheme

  • Su found Huang and Cao’s scheme is not secure.

    • Cannot provide authenticated key exchange security.


A novel and efficient unlinkable secret handshakes scheme

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


Security analysis of an unlinkable secret handshakes scheme

Security analysis of an unlinkable secret handshakes scheme

Author: T.-Y. Youn and Y.-H. Park

Source: IEEE Comm. Letters 14 (1) (2009)


A novel and efficient unlinkable secret handshakes scheme

  • Youn and Park also found Huang and Cao’s scheme is not secure.

    • Cannot provide authenticated key exchange securityand affiliation-hiding.


A novel and efficient unlinkable secret handshakes scheme

Receiving vB,thentry find PK

where vB=H1(KA, (PK, EA, EB), resp)