An Authentication Method with Spatiotemporal Interval and Partial Matching

In past research, we proposed an authentication method that combines actions with spatiotemporal information such as location, time, and distance. With the method, a user succeeds in authentication when he/she performs preset actions such as pushing button n times on preset intervals defined by spatiotemporal information. In this paper, we improve the authentication method using a partial matching method. We propose two kinds of partial matching methods for pushing button and interval. A type I method assumes the number of pushing button is sometimes less than preset count, but the number never exceeds it, and a user never pushes the button out of preset areas. A type II method assumes the number of pushing button is less or more than preset count occasionally, and a user pushes the button out of preset areas. We showed how to calculate FAR when the type I or II is applied. In the experiment, we compared the type I and II methods with a conventional method to evaluate their security. As a result, the type I method improved false acceptance rate (FAR) from 0.097% to 0.053%. The type II method improved FAR from 0.097% to 0.035%.