M.P. Aarthi and S.M. Karpagavalli 2015. SECURITY ENHANCEMENT FOR ACCESS CONTROL SYSTEMS BY USING DYNAMIC AUTHENTICATION . International journal of intellectual advancements and research in engineering computations. 3, 5 (Mar. 2015), 464–471. DOI:https://doi.org/10.61096/ijiarec.v3.iss5.2015.464-471.