The dynamic biometric signature — Is the biometric data in the created signature constant?

Biometric authentication methods are increasingly proving to be a sensible compromise between the demands on the user and/or the authentication tools without reducing the level of security. Dynamic biometric signature (DBS) systems record data from the handwritten signature using special tools which enable an analysis of both the static and dynamic properties associated with the typical behaviour of the signing individual. In our previous ICCST paper (Rome, 2014) we have undertaken fundamental experiments demonstrating the uniqueness of the DBS and its resistance to forgery. Limitation of this experiment was the significance homogeneity of the used test group consisting of students from the Cybernetics Department at the Technical University in Prague. Further experiments have been undertaken with the same content, but using an absolutely heterogeneous group consisting of men and women of different ages, levels of education and professions in order to show whether the uniqueness and resistance to forgery is preserved in the DBS even in this case. A no less significant aspect when assessing the properties of the DBS is the question of the immutability and duplicability of the already created biometric data. Further questions still arise as to the degree to which the characteristics of the DBS will change when the given individual is subjected to various influences. Our experiments have therefore focused on the creation of various conditions when signing and on monitoring their influence on the stability of the researched individual's DBS. In our paper we present the results of experiments that have the considerable importance in terms of DBS credibility when being used in authentication of users.