Privacy-Preserving Universal Authentication Protocol for Wireless Communications

1. Privacy-Preserving Universal Authentication Protocol forWireless Communications DaojingHe, JiajunBu, Sammy Chan, Chun Chen and MingjianYin IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 10, NO. 2, FEBRUARY 2011

2. Outline • Introduction • Method : Priauth • Scheme • Conclusion

3. Introduction Seamless roaming over wireless networks is Highly desirable to mobile users, and security such as authentication of mobile users is challenging. In this paper, we propose a privacy- preserving universal authentication protocol, called “Priauth”.

4. Introduction A typical roaming scenario involves three parties: Roaming user Visiting foreign server home server 𝐻 U V H

5. Introduction A privacy-preserving user authentication scheme should satisfy the following requirements: 1.Server Authentication 2. Subscription Validation 3.Provision of user revocation mechanism

6. Introduction 4. Key establishment 5. User anonymity 6. User untraceablility

7. Outline • Introduction • Method : Priauth • Scheme • Conclusion

8. Method : Priauth The method is the use of basic group signature. Group signature KEYGEN(N,T): a master public key 𝑚𝑝𝑘 secret keys𝑢𝑠𝑘[𝑖] The revocation token of member i at interval j is urt[i][ j]=Bij

9. Method : Priauth REVOKE ( RLj , urt[i][ j] ):If i is revoked at time interval j , then RLj ← RLj ∪{ Bij }. SIGN ( mpk, j , usk[i],M) = σ VERIFY ( mpk, j , RLj ,σ , M)

10. Method : Priauth Each server manages a group of subscribers, and each subscriber could be a roaming user. Each server also has a signing/verification key pair (𝑠𝑘, 𝑝𝑘) of a conventional digital signature method

11. Method : Priauth

12. Outline • Introduction • Method : Priauth • Scheme • Conclusion

13. Scheme

14. Outline • Introduction • Method : Priauth • Scheme • Conclusion

15. Conclusion In this paper, we have proposed a novel protocol to achieve privacy-preserving universal authentication for wireless communications.