Random Graphic User Password Authentication Scheme in Mobile Devices in Dotnet

Smart mobile terminal are an essential device in our life today. The user usually enters in the related words or draws a simple graphic on the touch screen as passwords for unlocking the screensaver. Although this way can provide users with simple and convenient security mechanism, the process would increase the risk of words or graphic information leakage under the strict security consideration. Usually for this type of keypad lock screen app you can only customize the simple pattern or swipe-to-unlock screen with a static image on a background image that you select to unlock your phone. Therefore, the interested parties could have a chance to eavesdrop the simple graphic pattern information in order to hacking the smart device for stealing the personal information. Due to lack of the proper identity authentication mechanism in the usually keypad lock screen app, this paper proposes a new graphic pattern protection mechanism for enhance authentication level in the keypad lock screen app field. By randomly changing the fixed position of the digital graphics that shows on the touch screen, the user can draw different graphic pattern every time based on the unique or backup PIN password to unlock the screen. Not only added the random graphic pattern authentication method indeed increase the personal secret information being stolen difficulty and complexity, it provides more security level than the traditional graphic pattern authentication in keypad lock screen as well.