Research on Enhancing the Security and Privacy of Biometrics Systems.pdf

1、With the large-scale proliferation of biometrics-based personal authenticationsystems, its security and privacy concerns have emerged as a hot research issue. A lotof researches have been conducted on the pattern recogni

2、tion area of biometrics regime,unfortunately; the critical security and privacy issues to attain the reliable andtrustworthy identity authentication are being ignored. A biometrics system, even withsignificant recognitio

3、n performance, is only universally acceptable if it is secure,reliable, robust against attacks and threats, and protects a user's privacy in efficientmanner. To overcome the biometrics security challenges and to all

4、eviate the biometricsprivacy issues, in this thesis, we investigate the methods and techniques aiming atthwarting the aforementioned problems inherent in biometrics systems. For the secure transmission of biometrics

5、 data over insecure network channel, twodifferent modes of data hiding schemes are proposed. The first method, which isimage-based hidden transmission of biometrics template, hides the biometric data intoa group of diffe

6、rent images. Secret keys are generated by the biometric image andencryption is applied on the biometric templates before hiding into the host images.Decoding performance of hidden templates is encouraging and outperforms

7、 in the caseof transmission attacks on the cover image. The second proposed method is an audiosignal-based covert-transmission scheme of biometric templates, in which we used anovel chaos and NDFT-based template hiding s

8、cheme, and proved that the combinationof encryption, encoding, modulation, and data hiding of biometric template in audiosignal could not affect the identification performance of the biometric recognitionsystem. The biom

9、etric data extraction performance of the system is efficiently capableof identifying a person without stringent compromise of matching accuracy. To obstruct the non-liveness and retransmission issues of biometrics i

10、mages, achallenge/response-based biometrics image scrambling system and method is proposed.In contrast to general challenge/response systems, which issue challenges to the user,our scheme is based on a novel architecture

11、 of intelligent biometrics sensor that hascomputational power to receive challenges from the authentication server and generateresponse to the challenge with the encrypted biometric image. The encryption anddecryption pe

12、rformance of the proposed system is encouraging to use in the real-timesystems of biometrics image transmission. In order to strengthen the privacy of biometrics data, an efficient and tokenlesstechnique is presente

13、d. Firstly, this scheme extracts features from the capturedbiometrics face images to generate the face feature vector and then, pseudorandomnumbers without using the tokens e.g. USB or smart card are generated, which can

14、 becombined with the face feature set to attain a binary FaceHash code. This schemeeliminates the fear of using biometrics for the cross matching applications, andprovides a remedy for non-revocable biometrics data.

15、 Finally, an efficient and practical chaotic hash-based fingerprint biometric remoteuser authentication scheme on mobile devices, e.g. cell phone and PDA, is investigated.This scheme is completely based on one-way collis

16、ion free chaotic hash functions, anddoes not maintain password tables and biometrics database on the remote server.Furthermore, users can choose their passwords freely and change or update themsecurely whenever they want

17、. This scheme is encouraging and better than using thelarge exponential functions or discrete logarithm problems on mobile devices, becauseof their low computational power and speed. Hence, the contribution of this