Cryptanalysis on dynamic authentication protocol for personal communication system

Owing to the rapid development of microelectronics techniques, the computation power of low-cost processors has increased greatly. Therefore, based on a public-key and secret-key hybrid algorithm, Zhibin and Naitong proposed an authentication scheme for personal communication systems; they emphasised security of mutual authentication, and claimed to provide non-repudiation of service. However, it is shown here that an attacker can easily impersonate a valid network provider, therefore non-repudiation of service is not provided by the aforementioned scheme.