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A key agreement protocol using mutual Authentication for Ad-Hoc Networks

A key agreement protocol using mutual Authentication for Ad-Hoc Networks. IEEE 2005 Authors : Chichun Lo, Chunchieh Huang, Yongxin Huang Date : 2005_11_29 Presented by Fei-Yau, Hung. Outline. Introduction Review of the Huang-Chang Scheme The proposed scheme

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A key agreement protocol using mutual Authentication for Ad-Hoc Networks

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  1. A key agreement protocol using mutual Authentication for Ad-Hoc Networks IEEE 2005 Authors : Chichun Lo, Chunchieh Huang, Yongxin Huang Date : 2005_11_29 Presented by Fei-Yau, Hung

  2. Outline • Introduction • Review of the Huang-Chang Scheme • The proposed scheme • Security analysis • Conclusion

  3. Introduction • Wireless technology has become more pervasive as E-Commerce and other applications communication platform. • Two kinds of network structures in wireless area network • Infrastructure • Infrastructureless

  4. Introduction • Properties concerned for security design in MANET (Ad-Hoc network) : • Self-organize • Fully decentralized • Dynamic topology • Low computation power

  5. Review of the Huang-Chang Scheme • Notations

  6. Review of the Huang-Chang Scheme • Notations

  7. Review of the Huang-Chang Scheme • Tree structure illustrates the membership

  8. Review of the Huang-Chang Scheme • Key initiation phase

  9. Review of the Huang-Chang Scheme • Authenticating the legal children

  10. Review of the Huang-Chang Scheme • Session Key Generation phase

  11. Review of the Huang-Chang Scheme • The flows of Huang-Chang’s Scheme • The replay attack : attacker collects multiple pairs, while the group is establishing. • The password guessing attack • Performance : must repeat n times to compute for each member

  12. The proposed scheme • Key initiation phase

  13. The proposed scheme • Key initiation phase

  14. The proposed scheme • Session key generation phase

  15. Example

  16. Example

  17. Example Node1 broadcast Node11 broadcast

  18. Example • All members compute their own session key , and send to the checker . • Finally, the checker will check all member’s session key.

  19. The proposed scheme • Session key Update periodically

  20. Security analysis • Dynamic key agreement protocol requirements • Group key secrecy • Key independency • Forward and backward secrecy

  21. Security analysis • Compare with Huang & Chang’s scheme • This protocol using nonce value to prevent the replay attack. • Password guessing attack does not wok.

  22. Security analysis • Performance Discussion

  23. Conclusion • Adding mutual authentication to avoid replay attack. • Modifying transcripts to prevent password guessing attack. • Periodical session key updating makes the ciphertext or chosen plaintext attack have no chance to happen. • The system can work well in the MANET environment.

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