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Efficient verifier-based key agreement protocol for three parties without server’s public key

Efficient verifier-based key agreement protocol for three parties without server’s public key. Source: Applied Mathematics and Computation 167 (2005)996-1003 Author: Sung-Woon Lee, Hyun-Sung Kim, Kee-Young Yoo Presenter: Li-Tzu Chang. Outline. Introduction

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Efficient verifier-based key agreement protocol for three parties without server’s public key

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  1. Efficient verifier-based key agreement protocol for three parties without server’s public key Source: Applied Mathematics and Computation 167 (2005)996-1003 Author: Sung-Woon Lee, Hyun-Sung Kim, Kee-Young Yoo Presenter: Li-Tzu Chang

  2. Outline • Introduction • Efficient verifier-based key agreement protocol for three-parties • Security analysis • Conclusions

  3. trusted server password table passwordA passwordB session key Introduction • Three-party

  4. Outline • Introduction • Efficient verifier-based key agreement protocol for three-parties • Security analysis • Conclusions

  5. Preliminaries

  6. Proposed protocol • Register A B AS (vA) (vB) vA , vB (password table)

  7. Proposed protocol A B AS (A,XA) (A,XA,B,XB) (XB) (XSB) (XSA)

  8. Proposed protocol A B AS (A,XA,B,XB,XSA, XSB) (XSA) (XSB) (vBS) (vAS)

  9. Proposed protocol A B AS (vSB) (vSA)

  10. Outline • Introduction • Efficient verifier-based key agreement protocol for three-parties • Security analysis • Conclusions

  11. Security analysis • AS可透過vAS、vBS確認Alice和Bob的合法身份且確定收到訊息；Alice和Bob可透過vSA、vSB認證AS的深份和收到訊息 • Attackers can’t directly compute the passwords or the session key • Against attackers masquerade clients or server • Using ‘⊕ ‘ operation to against password guessing attack

  12. Outline • Introduction • Efficient verifier-based key agreement protocol for three-parties • Security analysis • Conclusions

  13. Conclusions • proposed a new verifier-based key agreement protocol for three-parties, which does not require servers public key but requires each client only to remember a memorable password.

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