Cryptanalysis of an Improved User Authentication Scheme with User Anonymity for Wireless Communications
Eun‐Jun Yoon, Kee-Young Yoo · IEICE Transactions on Information and Systems · 2012
A user identity anonymity is an important property for roaming services. In 2011, Kang et al. proposed an improved user authentication scheme that guarantees user anonymity in wireless communications. This letter shows that Kang et al.'s improved scheme still cannot provide user anonymity as they claimed.