Extended OTP Mechanism Based on Graphical Password Method

OTP (One Time Password), a financial security authentication mechanism mainly used nowadays, is possible to cope with session attacks but has an weakness that it is difficult to apply differentiated mechanisms. This study intends to propose an extended OTP mechanism utilizing Graphical password method in order to solve such problem of the existing method. The proposed method is a Graphical password mechanism in story method based on user’s memory and can cope with various financial hackings and attack techniques. The existing authentication mechanisms have also a weakness in reliability to be used in mobile devices. In order to complement such weakness, GOTP (Graphical One Time Password) method was introduced so that users may use it in the Smartphone environment more easily and safely. Lastly, the effectiveness and validity were confirmed through an user study.