Authentication Scheme for Session Password using matrix Colour and Text

The most common method used for authentication is Textual passwords.But textual passwords are in risk to eves dropping, dictionary attacks, social engineering and shoulder surfing.Graphical passwords are introduced as alternative techniques to textual passwords.Most of the graphical schemes are helpless to shoulder surfing.To address this problem, text can be combined with images or colors to generate session passwords for authentication.Session passwords can be used only once and every time a new password is generated.In this paper, two techniques are proposed to generate session passwords using text and colors which are resistant to shoulder surfing.These methods are suitable for Personal Digital Assistants.