An efficient and practicable anonymous authentication scheme using smart cards

Recently, many smart card-based anonymous authentication schemes have been proposed to preserve user´s anonymity. Unfortunately, most of these schemes do not achieve to preserve user´s anonymity from the malicious user. In 2008, Kim et al. proposed a scheme which not only guaranteed user privacy but also provided traceable anonymity authentication. In this paper, we first point out that Kim et al.´s scheme still does not provide user anonymity as they claimed, then we highlight the inherent design flaw of Kim et al.´s scheme and the previous ones failing to protect user´s anonymity. Finally an efficient anonymous authentication scheme is proposed to solve these aforementioned problems.