Privacy Weakness Analysis of Delegation-Based Authentication Protocol
Taek-Young Youn, Chang-Han Kim · Information Security and Cryptology · 2010
Recently, Lee et al. proposed a delegation-based authentication protocol for secure and private roaming service in global mobility networks. In this paper, we show that the protocol cannot protect the privacy of an user even though the protocol provides the user anonymity. To prove the weakness, we show that the protocol cannot provide the unlinkability and also examine the weakness of the protocol caused by the lack of the unlinkability.