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Graphical Passwords

Graphical Passwords. Possible Collaborative Project. Usable Security – CS 6204 – Fall, 2009 – Dennis Kafura – Virginia Tech. Motivation. Text-based pass-”words” either

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Graphical Passwords

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  1. Graphical Passwords Possible Collaborative Project Usable Security – CS 6204 – Fall, 2009 – Dennis Kafura – Virginia Tech

  2. Motivation • Text-based pass-”words” either • Either provide strong guarantees against cracking by properties of length, character selection, lack of pneumonic quality, absence of ties to individual’s characteristics • Or are easy for users to remember without resorting to memory aids that may weaken the password’s security Usable Security – CS 6204 – Fall, 2009 – Dennis Kafura – Virginia Tech

  3. Graphical passwords • Pictures, icons, images, drawings, etc. are an alternative to textual passwords • Hypothesis: people find it easier to remember graphical information than textual information • Graphical forms may be harder to “hack” by automated means • Forms: • Selection of a graphical element from a menu • Identification of a point in a scene • Selection of a sequence of graphical elements or points that represents a meaningful easily recallable pattern

  4. Recall-a-story • Construct a “story” using a palette of provided images • Choose background • Select and place images on the background • Password = Background + ((image1,position1), … (imagen, positionn)) • Example: starting a barbecue, playing soccer beside the house, dog burns tail on barbecue

  5. Project • Collaborate with Yves Maetz (Thomson Technology Group, France) • Build a suitable test environment • Design and conduct user studies to assess the usability of tell-a-story graphical passwords against text passwords • Issues: • Memorability (short term, long term) • Population (VT students, children?, elderly?)

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