Authors D.P. Rublev, V.M. Fedorov
Month, Year 05, 2017 @en
Index UDC 004.056:061.68
Abstract In this paper identification problem for interacting with “mouse” pointing device by vibroacoustic signal originated from user is reviewed. Capabilities of data collection for user identification on vibroacoustic channel and advantages of this technique are shown. Operator’s workplace modifications, stand description and software are considered. Features of vibroacoustic signals obtained from user’s interaction with mouse are reviewed, stable features which allow mouse movement detection have been selected from Fourier transform, cepstral and linear prediction coefficients. Feature vectors have been formed by the relative in one-sample shift intervals of user activity which are global time-invariants. Sync scheme for keylogger’s log file and vibroacoustics signal for precise localization of keypress moments with mouse movement detection and feature vectors creation is reviewed, precise localization of mouse movements time moments for correct feature vectors forming have been done. Two and seven users identification results based on ANN learned with dichotomy scheme. The dependencies of neural network simulation errors on hidden layers dimensions, activation functions and input classes number have been considered, with correct identification probability verified increase dependent on informational signal length, according estimations of necessary length for identification rate comparable with typing techniques have been obtained. User identification is done on a basis of feature vectors formed by sliding windows, vibroacoustics of mouse movement noises is shown, dependencies of neural network errors on hidden layers neurons quantity, activation functions and output classes are considered.

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Keywords Vibroacoustic signal; discrete Fourier transform; cepstral coefficients, neural networks, linear prediction coefficients, identification.
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