In 2010, Sood-Sarje-Singh proposed two dynamic ID-based remote user authentication schemes. The first scheme
is a security improvement of Liao et al.’s scheme and the second scheme is a security improvement of Wang et
al.’s scheme. In both cases, the authors claimed that their schemes can resist many attacks. However, we find that
both schemes have security flaws. In addition, their schemes require a verification table and time-synchronization,
making the schemes unfeasible and unsecured for electronic services. In order to remedy the security flaws of
Sood et al.’s schemes, we propose a robust scheme which resists the well-known attacks and achieves all the
desirable security goals.
CitacióMartínez-Pelaez, R. [et al.]. Security improvement of two dynamic ID-based authentication schemes by Sood-Sarje-Singh. "Journal of Applied Research and Technology", 2013, vol. 11, núm. 5, p. 755-763.