Identity Authentication Based on Keystroke Latencies

@article{Joyce1990IdentityAB,
  title={Identity Authentication Based on Keystroke Latencies},
  author={Rick Joyce and Gopal K. Gupta},
  journal={Commun. ACM},
  year={1990},
  volume={33},
  pages={168-176}
}
The variables that help make a handwritten signature a unique human identifier also provide a unique digital signature in the form of a stream of latency periods between keystrokes. This article describes a method of verifying the identity of a user based on such a digital signature, and reports results from trial usage of the system. 
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