Unmistakable: Typing Behaviour as Biometric Feature
Just like the pianist at play, the keystroke behaviour of an individual produces a certain, identifiable melody.
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This melody is composed of different features that make the user's keystroke behaviour unmistakable. What is particularly characteristic is a user's keystroke dynamics which is made up of:
- speed and rhythm,
- being able to find quickly keys that are rarely used,
- keystroke dexterity.
As these features depend very much on the user's typing performance on any given day, Psylock also analyses features that do not change, e.g. right- or left-handedness, typical typos and error correction pattern.
Like a jigsaw puzzle, Psylock pieces together the bits of characteristic information to create an overall picture of user identity. All other login attempts are compared with this unchanging pattern in confirming the identity of the user.
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Measured data include the intervals between keystrokes otherwise known as the "flight time" or "transition time". The length of time a key is held down, the "dwell time", is also taken into account.
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