Abstract: In authentication, textual password methods are mostly used. But textual passwords are unsafe to eves dropping, dictionary attacks and shoulder surfing, dumpster diving. Graphical passwords are imported as different techniques. Maximum graphical schemes are unsafe to social engineering. To point this problem, text can be combined with images or colors to create session passwords for verification. Passwords can be used once and every time a new password is provoked. There are some procedure which are proposed to developed passwords using colors and text which are resistant to shoulder surfing. Personal Digital Assistance is a relevant technique.
Keywords: DAS, PDA, PIN, Color Code.