In 2014, Yang et al. proposed a new dynamic ID-based user authentication scheme based on smart card which is believed to have many abilities to resist a range of network attacks. However, this paper analyzes the security of Yang et al.'s scheme and then shows that the scheme not only is still vulnerable to off-line password guessing attack, but also does not provide the unlinkability property and user anonymity because of the identity guessing attack unlike their claims.

Recently, the RFID technology is combined with a u-healthcare services is an emerging trend in the field of medical services. u-healthcare service, as covering the field of personal health information beyond the level of simple health screening and treatment of life are closely related. Considering security, invasion of privacy, as well as life may be threatened even if your personal health information to be exposed or exploited illegally u-Healthcare services certification is essential. In 2012, Jeong proposed J-L patient authentication protocol that Initialization process, and patients using RFID technology separates the certification process. Jeong, such as the claim that the proposed protocol for reuse attacks, spoofing attacks, prevent information disclosure and traceability fire safety, but raises issues of security and operations efficiency. Therefore, in this paper, Jeong, such as the security of the proposed protocol and to prove the computational efficiency issues, and to enhance the safety and efficiency of RFID technology based on practical u-Healthcare services authentication protocol is proposed.

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