Ricardo Armengol Silva,  Luís Augusto Consularo,  Regina Célia Coelho. 

The password authentication has become an ordinary task for all personal computer users.Banks, intranets or service providers has required mouse point-and-click password entry to avoidspywares or snoopy intruders eavesdropping on keyboard typing. This work proposes an alternativesolution to password entry with augmented reality. A PC-connected webcam picture frames aresegmented to identify a finger tip whose position tracking translates a virtual finger on a virtualnumerical keyboard.

http://www.lbd.dcc.ufmg.br/colecoes/wra/2004/0014.pdf

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