Intrusion prevention by image based authentication techniques

PDAs are becoming one of the most popular gadgets all over the world. A PDA functions as a personal information manager. It has many functions. People store personal information like PIN numbers, account numbers etc. in the PDA. No one should access this information except the owner. Owner should be authenticated to use the gadget. Textual passwords are vulnerable to dictionary attacks, social engineering and shoulder surfing. Many graphical schemes are proposed to address these problems, but most of them are vulnerable to shoulder-surfing. Two authentication techniques-Pair based, and Text based Image Authentication are proposed in this paper which are resistant to shoulder surfing.