“…Among the different approaches (Wu, 1995;Chien et al, 2001;Kumar et al, 2010;Liaw, 1995;Liaw and Lei, 1995;Das et al, 2004;Wang et al, 2004Wang et al, , 2009Wen and Li, 2012;Juan and Zou, 2013;Chaturvedi et al, 2013;Zhang et al, 2014;Leu and Hsieh, 2014;Ramesh and Bhaskaran, 2014;Karuppiah and Saravanan, 2014;Kumari and Om, 2015;Lee et al, 2013), some researchers have developed the remote login schemes using geometric approach, which was first discussed by Wu (1995) with simple implementation in the Euclidean plane. The Wu's scheme was modified by Chien et al (2001) in 2001 proposed a scheme using a circle in n-dimensional space.…”