• Journal of the Institute of Electronics Engineers of Korea SP
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• v.45 no.1
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• pp.55-63
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• 2008

Ridge orientations of fingerprint image are crucial informations in many parts of fingerprint recognition such as enhancement, matching and classification. Therefore it is essential to extract the ridge orientations of image accurately because it directly affects the performance of the system. The two main properties of ridge orientation are 1) global characteristic(gradual change in whole part of fingerprint) and 2) local characteristic(abrupt change around core and delta points). When we only consider the local characteristic, estimated ridge orientations are well around singular points but not robust to noise. When the global characteristic is only considered, to estimate ridge orientation is robust to noise but cannot represent the orientation around singular points. In this paper, we propose a novel method for estimating ridge orientation which represents local characteristic specifically as well as be robust to noise. We reduce the noise caused by scar using iterative outlier rejection. We apply adaptive measurement resolution in each fingerprint area to estimate the ridge orientation around singular points accurately. We evaluate the performance of proposed method using synthetic fingerprint and FVC 2002 DB. We compare the accuracy of ridge orientation. The performance of fingerprint authentication system is evaluated using FVC 2002 DB.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.19 no.1
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• pp.63-70
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• 2009

Recently, in the security token based authentication system, there is an increasing trend of using fingerprint for the token holder verification, instead of passwords. However, the security of the fingerprint data is particularly important as the possible compromise of the data will be permanent. In this paper, we propose an approach for secure fingerprint verification by distributing both the secret and the computation based on the fuzzy vault(a cryptographic construct which has been proposed for crypto-biometric systems). That is, a user fingerprint template which is applied to the fuzzy vault is divided into two parts, and each part is stored into a security token and a server, respectively. At distributing the fingerprint template, we consider both the security level and the verification accuracy. Then, the geometric hashing technique is applied to solve the fingerprint alignment problem, and this computation is also distributed over the combination of the security token and the server in the form of the challenge-response. Finally, the polynomial can be reconstructed from the accumulated real points from both the security token and the server. Based on the experimental results, we confirm that our proposed approach can perform the fuzzy vault-based fingerprint verification more securely on a combination of a security token and a server without significant degradation of the verification accuracy.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.44 no.6
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• pp.43-50
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• 2007

In this paper we propose a method that identifies users at H.264 streaming using watermarking with fingerprints. The watermark can efficiently reduce the potential danger of forgery or alteration. Especially a biometric watermark has various advantages. Among entire biometric characteristics, the fingerprint is the most convenient and economical. In this paper we propose a novel fingerprint-based watermarking technique that can survive under very low bit-rate compression. The proposed algorithm consists of enhancement of a fingerprint image, the watermark generation using the extracted feature coordinates, watermark insertion using discrete wavelet transform, and authentication. The proposed algorithm can achieve robust watermark extraction against 0.264 compressed videos.

• Journal of KIISE:Software and Applications
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• v.31 no.7
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• pp.959-967
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• 2004

Jain et al. proposed the hybrid matching method which was combined the minutia-based matching method and the filter-bank based matching method. And, their experimental results proved the hybrid matching method was more effective than each of them. However, this hybrid method cannot utilize each peculiar advantage of two methods. The reason is that it gets the matching score by simply summing up each weighted matching score after executing two methods individually. In this paper, we propose new hybrid matching method. It mixes two matching methods during the feature extraction process. This new hybrid method has lower ERR than the filter-bank based method and higher ERR than the minutia-based method. So, we propose the adaptive hybrid scoring method, which selects the matching score in order to preserve the characteristics of two matching methods. Using this method, we can get lower ERR than the hybrid matcher by Jain et al. Experimental results indicate that the proposed methods can improve the matching performance up to about 1% in ERR.

• Journal of the Microelectronics and Packaging Society
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• v.23 no.2
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• pp.29-35
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• 2016

With the pace of rapid innovation in technology of IoT (Internet of Things) and smart devices, biometric technology becomes one of the most progressive industries. Recent trends in biometrics show most are focused on embedding biometric sensors in mobile devices for user authentication. Multifactor biometrics such as fingerprint, retina, voice, etc. are considering as identification system to provide users with services more secured and convenient. Here we, therefore, demonstrate some major technologies and market trends of mobile biometric technology with its concerns and issues.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2002.11a
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• pp.421-429
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• 2002

컴퓨터 및 네트워크의 기술 발전과 더불어 보안에 대한 필요성이 증가하고 있다. 이를 해결하기 위한 한 방법으로 지문이 개인의 식별 및 인증 수단으로 사용되고 있다. 본 논문에서는 신뢰도를 적용하여 보다 효율적이고, 믿을 수 있는 특징점 기반의 지문인식 시스템을 제안 및 구현한다. 마지막으로 제안된 시스템에 대한 성능 및 안전성을 분석을 한다.

• Proceedings of the Korean Information Science Society Conference
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• 2000.04b
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• pp.562-564
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• 2000

지문은 사람에 있어서 유일한 특징과 변하지 않는 특성으로 인하여 개인의 인증이나 식별에 많이 사용되고 있다. 이러한 특성을 가진 지문을 스마트 카드의 인증과정에 이용함으로서 보안성을 높이고 사용에 편리함을 추가할 수 있다. 본 논문에서는 지문의 특징점 추출 과정과 매칭 방법 그리고 자바카드에 지문을 등록하는 프로토콜과 인증하는 프로토콜을 제시하고 구현하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2000.04a
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• pp.671-673
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• 2000

현실세계에서 사이버 세계로의 전환은 우리에게 많은 생활의 변화를 가져옴과 동시에 혼란을 동반 하고 있다. 이러한 상황에서 암호기술은 사이버 세계의 질서를 잡는 핵심기술로 발전하고 있다. 본 논문에서는 기존의 공개키 기반 구조의 단점들을 보안 하는 방법으로 생체인증 기술인 지문 인식시스템과 RSA암호 알고리즘을 결합한 새로운 인증 시스템을 제안한다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04a
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• pp.524-526
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• 2003

지문은 사람에 있어서 유일한 특징과 변하지 않는 특성으로 인하여 개인의 인증이나 식별에 많이 사용되고 있다. 이러한 특성을 가진 지문을 스마트카드의 인증과정에 이용함으로써 보안성을 높이고 사용에 편리함을 추가할 수 있다. 본 논문에서는 스마트카드와 서비스시스템 간에 지문을 이용한 인증시스템을 제안하였다. 제안된 시스템은 카드와 서비스시스템이 각각 특징점 정보와 방향성정보를 매칭 함으로서 스마트카드의 계산부하를 줄일 수 있고, 본인 거부율과 타인 수락율의 오류를 줄일 수 있다.

• Proceedings of the IEEK Conference
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• 2002.06c
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• pp.131-134
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• 2002

As the increased use of computer, wired/wireless/mobile Internet, security in using Internet becomes a more important problem. Thus, biometric technology using physical and behavior characteristics of a person is hot issue. Many different types of biometric technologies of a person such as fingerprint, face, iris, vein, DNA, brain wave, palm, voice, dynamic signature, etc. had already been studied but remained unsuccessful because they do not meet social demands. However, recently many of these technologies have been actively revived and researchers have developed new products on various commercial fields. Dynamic signature verification technology is to verify the signer by calculating his writing manner, speed, angle, and the number of strokes, order, the down/up/movement of pen when the signer input his signature with an electronic pen for his authentication. Then signature verification system collects mentioned above various feature information and compares it with the original one and simultaneously analyzes to decide whether signature is forgery or true. The prospect of signature verification technology is very promising and its use will be wide spread in terms of economy, security, practicality, stability and convenience.