Abstract
A smart-card based authentication scheme for telecare medicine information systems enables patients, doctors, nurses, health visitors and the medicine information systems to establish a secure communication platform through public networks. Zhu recently presented an improved authentication scheme in order to solve the weakness of the authentication scheme of Wei et al., where the off-line password guessing attacks cannot be resisted. This investigation indicates that the improved scheme of Zhu has some faults such that the authentication scheme cannot execute correctly and is vulnerable to the attack of parallel sessions. Additionally, an enhanced authentication scheme based on the scheme of Zhu is proposed. The enhanced scheme not only avoids the weakness in the original scheme, but also provides users’ anonymity and authenticated key agreements for secure data communications.



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Acknowledgment
This work is supported by National Science Council under the grants NSC100-2221-E-320-004.
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Lee, TF., Liu, CM. A Secure Smart-Card Based Authentication and Key Agreement Scheme for Telecare Medicine Information Systems. J Med Syst 37, 9933 (2013). https://doi.org/10.1007/s10916-013-9933-8
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DOI: https://doi.org/10.1007/s10916-013-9933-8