Abstract: The conventional password systems are vulnerable to shoulder surfing, many shoulder surfing graphical password systems have been proposed. However, as most users are more familiar with textual passwords than pure graphical passwords, text-based graphical password systems have been proposed. Unfortunately, none of the existing text-based shoulder surfing resistant graphical password systems is both secure and efficient enough. In this paper, we propose an improved text-based shoulder surfing resistant graphical password system by using colors. In the proposed system, the user can easily and efficiently login system. Next we analyze the security and usability of the proposed system, and show the resistance of the proposed system to shoulder surfing and accidental login.
Keywords: pass-colour, pass-character, graphical, shoulder surfing resistant.