Biometric Security Solutions for Human Authentication

Abstract

In the present day of automated world, machines are replacing the human in every aspect of life. Due to this, the security concern regarding the authenticity of the user goes on increasing. Hence, it becomes necessary to include some constrains in order to reject imposters (unauthorized persons) and allow only the authorized user to access automated services. Biometric can provide the solution to these problems. Although a lot of work has been done in the field of biometric, particularly, in the field of fingerprint biometric, nevertheless objective of highly secure practical solution is still to be achieved. Present thesis is an attempt to propose biometric based security solutions for human authentication with improvement in existing techniques and solutions based on level of security concerns. In the initial part the major problems in minutiae based fingerprint authentication system have been addressed. The improved algorithms for thinning, minutiae extraction and relative alignments of query and reference fingerprint images have been proposed. In addition to that an image based fingerprint verification system; a combination of biometric (voice) with conventional method (password) and a fuzzy logic based multibiometric system using fingerprint and palmprint has also been proposed. An improved thinning algorithm (preprocessing step in minutiae based system) has been proposed and implemented by using the Karnaugh map (K-Map) technique in which all the rules are simultaneously applied to each and every pixel which resulted in faster response as compared to look up table technique. The response time of the system has further been reduced by improving the window extraction time and by using the short circuit logical operators. Single isolated pixels are also removed from thinned image as they are not required in the final minutiae extraction stage. Rotation independent thinned skeleton of one pixel width and overall significant reduction of CPU time has been achieved with the proposed method. Crossing Number method