International Association
for Cryptologic Research

Recently, Sood-Sarje-Singh proposed an improvement to Liou et al.\'s dynamic ID-based remote user authentication scheme using smart cards to prevent impersonation attack, malicious user attack, off-line password guessing attack, and man-in-the-middle attack. However, we demonstrate that Sood et al.\'s scheme is still vulnerable to malicious user attack, impersonation attack and steal information from a database attack.