A novel user authentication scheme with anonymity for wireless communications

User authentication and privacy protection are important issues for wireless and mobile communication systems such as GSM, 3G, and 4G wireless networks. Recently, Yoon et al . proposed a user‐friendly authentication scheme with anonymity for wireless communications. However, in this paper, we show that user anonymity of their scheme is not achieved under the eavesdropping attack and their scheme is not fair in the key agreement. In order to...