Textual passwords are the most common method used for authentication. But textual
passwords are vulnerable 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 vulnerable 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.
Index Terms: Authentication, session passwords, shoulder surfing
passwords are vulnerable 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 vulnerable 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.
Index Terms: Authentication, session passwords, shoulder surfing
