Quality indices of dynamic signature recognition systems based on naive Bayes classifier and neural network
The research aims at creation of an authentication system based on the traditional password protection with biometric addition, providing security indicator improvement compared to the original version. This addition is a dynamic handwritten digital signature authentication based on neural networks and Bayesian classifier combining. The paper considers the possibility of combining classifier based on neural networks with Bayesian classifier by linear combination of outputs to reduce the overall probability of error classification regardless the error types. Within linear combination, neural network plays the leading role, since the results of neural network match those of linear combination. Results similarity was confirmed by comparison with expected values. It means that a linear combination without using errors of types 1 and 2 taken into account separately does not make sense because of the possibility of implementing neural network instead of linear combination. Thresholds of authentication for using errors of 1-st and 2-nd types taken into account separately accounting were created. The systems based on modified naive Bayes classifier and neural network, depending on the thresholds of authentication, was implemented. Software module for calculating errors of the 1-st and 2-nd type in neural network and Bayesian classifier was developed. The behavior of user dynamic parameters within signature recognition systems was presented. Performance evaluation of authentication system in the form of probabilities of errors of 1-st and 2-nd types was obtained.