Abstract
Nowadays, the Global System for Mobile (GSM) communications is used widely by people around the world. However, there are some problems of GSM authentication to be found. In 2004, Choi and Kim proposed an authentication and key agreement scheme with user privacy protection in GSM. They claimed that their scheme can improve some drawbacks of GSM authentication and achieve user privacy protection. But we find that Choi and Kim's (2004) scheme is not able to achieve privacy protection and resist some well-known attacks completely. In this paper, we propose a more efficient GSM authentication and key agreement protocol with robust identity privacy protection.
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