PIN-Pad Entry „Exception Handling“ Procedure as a Complementary Method in Fingerprint Authentication Systems

Automatic fingerprint authentication is an integral part in many security systems. Because not every person is always suited to that technology, a general purpose security system needs a secure exception handling.

Fiche signalétique

  • Département HESB | Technique et informatique
  • Pôle de recherche Human Centered Engineering
  • Champ de recherche Human Centered Engineering
  • Durée 01.01.2007 - 30.09.2008
  • Direction du projet Josef Götte
  • Équipe du projet Marcel Jacomet
    Andreas Eicher
    Josef Götte
  • Mots-clés fingerprint, finger pressure, authentication

Contexte initial

We develop ideas and find accompanying results to use an existing fingerprint sensor for complementary tasks allowing fall-back solutions for situations where someone cannot use the fingerprint in automatic authentication. Additionally to the detection of finger movement we detect the pressure variation applied by a finger. This pressure detection is the basis for various exception handling scenarios.


Based on our novel method for pressure detection with commercial fingerprint sensors, we develop a PIN-pad entry system serving as exception-handling procedure to fingerprint authentication.

Compétences clés

Hardware algorithms, miniaturization and chip design, sigma-delta algorithms, RFID technology, algorithms for biometry.


We use stripe fingerprint sensors to perform, additionally to the usual task of fingerprint capturing, other tasks that support communication between user and device. In our invention a user can move his finger in x- and y-direction across the sensor and increase pressure representing z direction. Using this 3 dimensional input, a variety of new man-machine interface techniques can be devised. Presently we realized a PIN-pad entry schema.


Generalizations towards secure authentication with fingers include the additional usage of behavioral components (rhythms, movements, pressure variations). These behavioral traits lead to the new idea of a fingerprint signature.