Privacy-Preserving Universal
Authentication Protocol for
Wireless Communications
Daojing He, Jiajun Bu, Sammy Chan, Chun Chen and
Mingjian Yin
IEEE TRANSACTIONS ON WIRELESS
COMMUNICATIONS,VOL. 10, NO. 2, FEBRUARY 2011
Outline
Introduction
 Method : Priauth
 Scheme
 Conclusion

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 privacypreserving universal authentication
protocol, called “Priauth”.
Introduction
A typical roaming scenario involves three parties:
Roaming user
Visiting foreign server
home server 𝐻
U
V
H
Introduction
A privacy-preserving user authentication
scheme should satisfy the following
requirements:
1.Server Authentication
2. Subscription Validation
3. Provision of user revocation
mechanism
Introduction
4. Key establishment
5. User anonymity
6. User untraceablility
Outline
Introduction
 Method : Priauth
 Scheme
 Conclusion

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
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)
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
Method : Priauth
Outline
Introduction
 Method : Priauth
 Scheme
 Conclusion

Scheme
Outline
Introduction
 Method : Priauth
 Scheme
 Conclusion

Conclusion
In this paper, we have proposed a novel
protocol to achieve privacy-preserving
universal authentication for wireless
communications.