A free drawing graphical password scheme

Alice J. Lin, Fuhua Cheng

Research output: Contribution to journalArticlepeer-review


This paper presents a method for freely drawing a graphical password. The new method achieves better security than conventional textual passwords and other graphical password schemes. With this method it is also easier for a user to remember the password. The basic idea of the new method is to use a number of the user's representative sample drawings to predict the user's future drawing prediction interval. The predicted values are obtained by conducting the least squares method to the polynomial regression/B-spline regression model. Based on the predicted values and deviation of the user's sample drawings, a prediction interval for the signature/picture is generated. This prediction interval is used as the password and, subsequently, if the signature/picture drawn by a user lies within the prediction interval, the user is authenticated into the application.

Original languageEnglish
Pages (from-to)553-561
Number of pages9
JournalComputer-Aided Design and Applications
Issue number4
StatePublished - 2009


  • Free drawing
  • Graphical password
  • Prediction
  • Security
  • Signature

ASJC Scopus subject areas

  • Computational Mechanics
  • Computer Graphics and Computer-Aided Design
  • Computational Mathematics


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