Sharanya.P, Vijaya Sharon.A, Vijay.S and Dhivya.P 2015. CAPTCHA AS A GRAPHICAL PASSWORD –MULTILEVEL SECURITY PRIMITIVE . International journal of intellectual advancements and research in engineering computations. 2, 3 (Feb. 2015), 33–36. DOI:https://doi.org/10.61096/ijiarec.v2.iss3.2014.33-36.