• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 1998.12a
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• pp.289-301
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• 1998

이동통신에서의 사용자 인증 서비스는 통화도용 방지와 신뢰성 있는 과금을 위한 중요한 보호 서비스이다. 본 논문에서는 IS-95A 인증 시스템에 적용 가능한 안전한 인증 알고리듬과 인증 키 생성 알고리듬을 제안한다. 특히 인증 알고리듬을 활용하여 인증 키 생성알고리듬을 Oracle 해쉬함수의 형태로 구현함으로써 인증 시스템의 높은 안전성과 간결성을 동시에 성취하였다. 그리고 통계적 분석 기법을 사용하여 개발된 알고리듬의 출력 특성을 분석한다.

• Proceedings of the Korea Contents Association Conference
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• 2004.05a
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• pp.283-288
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• 2004

Authentication and digital signature make secured existing contract in remote spot. But, It required method of storing and managing secret, such as private key password. For this method, we make efforts solution of security with smart cart, such as java card. This paper implement SEED algorithm based on Java Card

• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.799-800
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• 2006

This thesis implemented security systems of voice awareness which is higher accessible than existing security system using biological authentication system and is inexpensive in module of security device, and has an advantage in usability. Proposed the security systems of voice awareness implemented algorithm for characteristic extraction of inputted speaker's voice signal verification, and also implemented database of access control that is founded on extractible output. And a security system of voice awareness has a function of an authority of access control to system.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2001.05a
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• pp.237-240
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• 2001

In this work, we will present an iris pattern recognition method as a biometrically based technology for personal identification and authentication. For this, we propose a new algorithm for extraction unique feature from images of the iris of the human eye and representing these feature using the discrete fourier transform. From the computational simplicity of the adopted transform, we can obtain more fast and efficient results than previous ones.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.11b
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• pp.1383-1386
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• 2002

Ad Hoc 네트워크는 베이스 스테이션이나 이동스위칭 센터와 같은 기존의 고정 된 infrastructure가 없는 이동 호스트들을 위한 새로운 패러다임이다. 본 논문에서는 기존의 Table-driven 방식과 On-demand 라우팅의 장점을 접목시킨 2-tier 계층구조를 사용한 다이나믹 라우팅 기법과 이를 바탕으로 효율적인 routing 경로를 확보하면서도 구조적으로 취약한 보안 위협 요소들에 대한 안정성을 제공하는 클러스터 노드간에 RSA기법을 사용한 인증 알고리즘을 제안한다.

• Review of KIISC
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• v.3 no.4
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• pp.27-37
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• 1993

본 연구에서는 기존의 메세지 인증방식인 MAC(Message Aunthentication Code)와 MDC(Manipulation Detection Code)에 대한 제 3자의 적극적인 공격(active attack)하에서의 구조직인 취약점을 분석하고, 이를 보완하는 새로운 인증 방식을 제안하고 검증하였다. 새로운 메세지 인증방식은 기존의 방식과는 다르레 제3자의 공격을 받은 메세지 블럭을 바로 검출할 수 있다는 장점을 가지고 있기 때문에 통신 시스템 상에서 불필요한 메세지의 재전송을 줄일 수 있다는 측면에서 효율적인 인증 방식이다.

• Proceedings of the KAIS Fall Conference
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• 2008.05a
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• pp.254-257
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• 2008

인터넷이 보편화 되면서 정부기관의 주민 관리업무나 은행의 계좌 거래도 인터넷으로 해결하고 있다. 그러나 피싱 등의 인터넷 사기 수법이 발각되고 이슈화 되면서 많은 사람들이 인터넷에 대하여 편리함을 뒤로 하고 개인정보 유출에 대해서 두려워하고 있다. 이것은 앞으로 RFID기술이 사용자들에게 익숙하게 다가가기 위해 선행되어야 할 과제이다. 실제로 보안에 관한 문제가 해외 시범사업 사례에서 드러났으며 해당 사업체도 RFID기술 도입을 정책적으로 끌고 가기 보다는 그에 앞서 서서히 시간을 두고 조심스럽게 리스크를 최소화 시키는 방법을 연구하였다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.26 no.2
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• pp.301-314
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• 2016

Juels and Sudan's fuzzy vault scheme has been applied to various researches due to its error-tolerance property. However, the fuzzy vault scheme does not consider the difference between people's preferences, even though the authors instantiated movie lover' case in their paper. On the other hand, to make secure and high performance face authentication system, Nyang and Lee introduced a face authentication system, so-called fuzzy face vault, that has a specially designed association structure between face features and ordinary fuzzy vault in order to let each face feature have different weight. However, because of optimizing intra/inter class difference of underlying feature extraction methods, we can easily expect that the face authentication system does not successfully decrease the face authentication failure. In this paper, for ensuring the flexible use of the fuzzy vault scheme, we introduce the bucket structure, which differently implements the weighting idea of Nyang and Lee's face authentication system, and three distribution functions, which formalize the relation between user's weight of preferences and system implementation. In addition, we suggest a matchmaker scheme based on them and confirm its computational performance through the movie database.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.5
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• pp.550-558
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• 2019

As the scale of the Internet of Things (IoT) environment grows and develops day by day, the information collected and shared through IoT devices becomes increasingly diverse and more common. However, because IoT devices have limitations on computing power and a low power capacity due to their miniaturized size, it is difficult to apply security technologies like encryption and authentication that have been directly applied in the previous Internet environment, making the IoT vulnerable to security threats. Because of this weakness, important information that needs to be delivered safely and accurately is exposed to the threat of malicious exploitation, such as data forgery, data leakage, and infringement of personal information. In order to overcome this threat, various security studies are being actively conducted to compensate for the weaknesses in IoT environment devices. In particular, since various devices interact, and share and communicate information collected in the IoT environment, each device should be able to communicate with reliability. With regard to this, various studies have been carried out on techniques for device authentication. This study examines the limitations and problems of the authentication techniques that have been studied thus far, and proposes technologies that can certify IoT devices for safe communication between reliable devices in the Internet environment.

• Journal of the Korea Society of Computer and Information
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• v.17 no.1
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• pp.171-181
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• 2012

This paper defines the AES password algorithm used as a symmetric-key-based password algorithm, and proposes the design of parallel password algorithm to utilize the resources of multi-core processor as much as possible. The proposed parallel password algorithm was confirmed for parallel execution of password computation by allocating the password algorithm according to the number of cores, and about 30% of performance increase compared to AES password algorithm. The encryption/decryption performance of the password algorithm was confirmed through binary comparative analysis tool, which confirmed that the binary results were the same for AES password algorithm and proposed parallel password algorithm, and the decrypted binary were also the same. The parallel password algorithm for multi-core environment proposed in this paper can be applied to authentication/payment of financial service in PC, laptop, server, and mobile environment, and can be utilized in the area that required high-speed encryption operation of large-sized data.