• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2009년도 IWAIT
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• pp.400-403
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• 2009

EAP (Extensible Authentication Protocol) is often used as an authentication framework for two-party protocol which supports multiple authentication algorithms known as "EAP method". And PKMv2 in 802.16e networks use EAP as an authentication protocol. However, this framework is not efficient when the EAP peer executing handover. The reason is that the EAP peer and EAP server should re-run EAP method each time so that they authenticate each other for secure handover. This makes some delays, so faster re-authentication method is needed. In this paper, we propose a new design of the PKMv2 framework which provides fast re-authentication. This new framework and usage of the keys which used as a short-term credential bring better performance during handover process.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권9호
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• pp.4560-4575
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• 2018

Since smartphone contains various personal data, security is one of the important aspects in smartphone technologies. Up to now, various authentication techniques have been proposed to protect smartphones. The pattern lock on the Android system is one of the most widely used authentication methods for low-cost devices but it is known to be vulnerable to smudge attack or shoulder surfing attack. LG's smartphone uses its own technique, which is called "Knock Code." The knock code completes the authentication by touching the user defined area in turn on the screen. In this paper, we propose the new, enhanced version of knock code by adding the sliding operation and by using flexible area recognition. We conducted security analysis, which shows that under the same password size, the search space is overwhelmingly larger than the original algorithm. Also, by using the sliding operation, the proposed scheme shows resilience against smudge attacks. We implemented the prototype of our scheme. Experimental results show that compared with the original Knock Code and Android pattern lock, our scheme is more convenient while providing better security.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권6호
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• pp.3280-3298
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• 2019

Vehicular ad-hoc networks (VANETs) have become increasingly significant in intelligent transportation systems, they play a great role in improving traffic safety and efficiency. In the deployment of intelligent VANETs, intelligent vehicles can efficiently exchange important or urgent traffic information and make driving decisions. Meanwhile, secure data communication and vehicle's identity privacy have been highlighted. To cope with these security issues, in this paper, we construct an efficient anonymous authentication scheme with secure communication in intelligent VANETs. Combing the ElGamal encryption technique with a modified Schnorr signature technique, the proposed scheme provides secure anonymous authentication process for encrypted message in the vehicle-to-infrastructure communication model, and achieves identity privacy, forward security, and reply attack resistance simultaneously. Moreover, except the trusted authority (TA), any outside entity cannot trace the real identity of an intelligent vehicle. The proposed scheme is designed on an identity-based system, which can remove the costs of establishing public key infrastructure (PKI) and certificates management. Compared with existing authentication schemes, the proposed scheme is much more practical in intelligent VANETs.

• Nuclear Engineering and Technology
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• 제51권7호
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• pp.1791-1798
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• 2019

Instrumentation and Control (I&C) systems of nuclear power plants (NPPs) have been continuously digitalized. These systems have a critical role in the operation of nuclear facilities by functioning as the brain of NPPs. In recent years, as cyber security threats to NPP systems have increased, regulatory and policy-related organizations around the world, including the International Atomic Energy Agency (IAEA), Nuclear Regulatory Commission (NRC) and Korea Institute of Nuclear Nonproliferation and Control (KINAC), have emphasized the importance of nuclear cyber security by publishing cyber security guidelines and recommending cyber security requirements for NPP facilities. As described in NRC Regulatory Guide (Reg) 5.71 and KINAC RS015, challenge response authentication should be applied to the critical digital I&C system of NPPs to satisfy the cyber security requirements. There have been no cases in which the most robust response authentication technology like challenge response has been developed and applied to nuclear I&C systems. This paper presents a challenge response authentication mechanism for a Programmable Logic Controller (PLC) system used as a control system in the safety system of the Advanced Power Reactor (APR) 1400 NPP.

• 사물인터넷융복합논문지
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• 제4권2호
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• pp.13-20
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• 2018

본 논문은 최근 대두된 신기술인 '블록체인' 기술을 기반으로 'Single-Sign-On'과 'Token 기반 인증 방식'을 접목한 인증 시스템을 제안하였다. Single-Sign-On 기반 인증 방식에 블록체인 기술을 접목하여 '접근제어' 기능과 '무결성'을 제공하였으며, Token 기반 인증 방식을 사용하여 Stateless한 Self-Contained 인증 기능을 제공하였다. 암호화 기반 Token 발급 및 인증 과정을 수행하여 보안성을 높일 수 있었으며, Web Server에 대한 인증 편리성을 제공하였다. 또한 SSO과 Token 기반 인증을 통해 번거로운 인증 과정을 보다 편리하게 개선할 수 있는 방법을 제시하였다.

• 정보과학회 논문지
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• 제43권10호
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• pp.1154-1164
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• 2016

타인의 접근제어를 위해 사용하는 스마트폰 인증은 스마트폰 사용 시 마다 다양한 방법으로 스마트폰 소유자의 여부를 확인한다. 그러나 이러한 빈번한 인증은 사용자들의 불편함을 야기하며, 때로는 인증방법을 사용하지 않게 하는, 궁극적으로 스마트폰 보안의 치명적인 문제로 작용한다. 본 논문에서는 이러한 문제들을 해결하고 사용자들의 보안인증 사용을 촉진하여 보안성을 증대시키기 위한 안드로이드 플랫폼 기반의 지속인증 모델을 제안한다. 제안 모델은 스마트폰의 현 상황위험도를 측정, 그에 맞추어 적절한 인증 수단을 결정, 적용하며, 낮은 위험도 수준일 경우 인증을 수행하지 않아 사용자의 가용성을 높여준다. 상황위험도를 정의하기 위해 설문조사를 이용하였으며, 설문결과를 연령, 위치, 장소, 행동 등으로 세분화하여 분석하였다. 본 연구 결과의 시연을 위해 정의된 상황위험도와 보안인증수단과의 관계를 시각화하여 보여줄 수 있도록 시연프로그램을 구현하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제5권11호
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• pp.2204-2220
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• 2011

Without providing a proper security measure to the handover procedure in Mobile WiMAX, several security attacks can be mounted. Even though security schemes have been previously proposed for this purpose, they are still vulnerable to several security attacks due to fatal design flaws. A newly proposed security scheme in this paper is based on the framework of authentication domain and concept of handover ticket. A method of establishing security associations within the authentication domain is proposed, and a lightweight security measure to protect the management messages associated with the handover is also proposed. Especially, using the handover ticket, the new security scheme can defend against a Redirection Attack arising from a compromised base station. The new security scheme is comparatively analyzed with the previous security schemes in terms of Replay, Session Hijacking, Man-In-The-Middle, and Redirection attacks.

• 한국정보통신학회논문지
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• 제22권1호
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• pp.75-82
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• 2018

모바일 기기 사용자가 증가함에 따라서 다양한 사용자 인증 방식에 대한 연구가 활발하게 진행되고 있다. 사용자 인증방식에는 사용자 아이디와 비밀번호를 이용하는 지식기반 인증방식, 사용자만이 가지고 있는 특성인 생체기반, 위치기반 등을 이용하는 방법과 OTP(On Time Password)와 같은 2차 인증을 진행하는 인증방식이 사용되고 있다. 본 논문에서는 기존 인증방식의 문제점을 개선하고 사용자가 원하는 방식으로 암호화가 진행될 수 있는 사용자 시스템을 제안한다. 제안한 인증 시스템은 모바일 기기를 이용하여 인증요소를 수집하는 인증요소 수집 모듈, 수집한 인증요소를 조합하여 보안키를 생성하는 보안키 생성 모듈, 생성된 보안키를 이용하여 인증을 진행하는 암호화 및 복호화 모듈로 구성된다.

• 정보보호학회논문지
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• 제19권6호
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• pp.191-194
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• 2009

최근, 익명 인증 서비스를 제공하는 기법이 Chang 등에 의해 제안되었다. 본 논문에서는 Chang-Lee-Chiu 익명 인증 기법이 안전하지 않음을 보인다. 취약성을 보이기 위해 사용자의 신원 정보를 쉽게 알아낼 수 있는 공격 방법을 설명한다.

• Journal of Information Processing Systems
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• 제14권2호
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• pp.523-538
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• 2018

Keystroke dynamics user authentication is a behavior-based authentication method which analyzes patterns in how a user enters passwords and PINs to authenticate the user. Even if a password or PIN is revealed to another user, it analyzes the input pattern to authenticate the user; hence, it can compensate for the drawbacks of knowledge-based (what you know) authentication. However, users' input patterns are not always fixed, and each user's touch method is different. Therefore, there are limitations to extracting the same features for all users to create a user's pattern and perform authentication. In this study, we perform experiments to examine the changes in user authentication performance when using feature vectors customized for each user versus using all features. User customized features show a mean improvement of over 6% in error equal rate, as compared to when all features are used.