| Summary: | 碩士 === 中國文化大學 === 資訊管理學系 === 105 === With the rapid development of communication technology, people use the network service by the mobile device when traveling at other countries. However, a user needs to verify by the local server in order to use the network service that is provided by the foreign server. Therefore, the secure authentication scheme for roaming with mobile device becomes more important.
In 2015, Farash et al. pointed out Shin et al.’s and Wen et al.’s schemes exist several security flaws, then proposed an enhanced scheme to fix the weakness. In 2016, Islam et al. showed Lin et al.’s scheme unable to check the password, that the attacker could impersonate the user and the session key would disclose. Islam et al. also proposed a scheme based on Chebyshev chaotic map. In their scheme has not the foreign agent to provide the roaming service. Further, both Farash et al.’s scheme and Islam et al.’s scheme does not provide untraceability, offline password guessing and duplicate registration attacks.
In our study, we improve the Farash et al.’s scheme and propose a new authentication scheme. After all, we analyze our new scheme and prove that the new scheme is more secure than others.
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