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Modified Authenticated Key Exchange Protocol for SIP using ECC
김현성,이성운 보안공학연구지원센터 2010 보안공학연구논문지 Vol.7 No.4
The authentication procedure in session initiation protocol (SIP), an IETF standard protocol for initiating an interactive user session, typically uses HTTP digest authentication, which is vulnerable to many known attacks. To cope with the problems, Wu et al. proposed a new authenticated key exchange (NAKE) protocol for SIP based on the Elliptic Curve Cryptosystem. However, this paper shows that the NAKE is insecure against the off-line password guessing attack and proposes a modified authenticated key exchange (MAKE) protocol for SIP. The MAKE fits neatly in the SIP protocols as described in RFC 3261.
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Robust Remote User Authentication Schemeusing Smart Cards
김현성,이성운 보안공학연구지원센터 2010 보안공학연구논문지 Vol.7 No.5
Two user authentication schemes were recently proposed using smart cards. They do not need to maintain a verification table in registration server, which is one of the good and necessary aspect in the password based schemes. In this paper, we show that they are not secure against some attacks. Then we propose a robust remote user authentication scheme to withstand the flaws in them but preserve the same merits of them. Our scheme could be efficiently used in wireless communication applications.
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Desynchronization Attackon Hash-based RFID Mutual Authentication Protocol
김현성 보안공학연구지원센터 2012 보안공학연구논문지 Vol.9 No.4
A radio frequency identification (RFID) system is a promising automatic identification technology that uses communication via radio waves to identify and track moving objects. Privacy and security concerns inhibit the fast adaption of RFID technology for many applications. Although many EPCgen2 compliant protocols have been proposed in a quest to ensure security of low cost tags, still more the optimum security is not achieved as many protocols are found prone to well-known attacks. Recently, Cho et al. proposed a hash-based RFID mutual authentication protocol and the protocol is secure. However, this paper shows that Cho et al.’s protocol is weak against desynchronization attack and provides remedy for it.
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김현성,Dong-Pyo Han,Ji-Yeon Oh,심종인,신동수,류한열 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.11
The nonradiative recombination carrier lifetime in InGaN/GaN quantum wells was measured utilizing a time-resolved photoluminescence measurement. The lifetime was estimated from the final decay stage of the temporal response of the photoluminescence, which is closely related to the nonradiative recombination. The nonradiative recombination carrier lifetime estimated by using the given method showed of relative independence from the carrier density in the quantum well. A study comparing the nonradiative recombination carrier lifetime estimated by using the given method with the results of temperature-dependent photoluminescence and current-dependent electroluminescence measurements at room temperature we performed. This unique method can be very useful for measuring the nonradiative carrier lifetime with good accuracy within a short time.
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김현성 한국일본사상사학회 2009 일본사상 Vol.0 No.17
2009年に鳩山政権が登場した以来、アジア諸国では日本の東アジア共同体への期待が高まりつつあるものの、東アジア共同体をめぐる日本での議論はそれほど新しい概念とは言えない。そこで、本稿は戦後日本で議論されてきた東アジア共同体構想の展開とともに国家間関係と交流メカニズムに対する認識がどのように変容してきているのかを考察した。その結果は次のようにまとめることができる。 第一に、国家関係においては、1990年代半ばごろまでの日本はアジア太平洋という地域コンセプトに基づき、競争の観点からアプローチした。それ以来、アジア太平洋からアジアへの回帰が東アジア共同体にアプローチする認識の基盤となってきた。学術レベルでの議論は、その方向性の変化に論理の基礎を提供した。その認識の転換を言い換えれば、日本の東アジア共同体構想は、19世紀後半の‘脫亞入歐’から‘脫歐入亞’へと再構築される過度期の中で変容してきたといえる。 第二に、共同体での交流メカニズムに対する認識は、1960年代と1970年代は国益に焦点を当てることによって経済分野に限定した共同体論が主流であった。しかし、国益からの切り放すことによって思想や社会・文化分野での交流拡大へとその論点が広げられてきた。共同体として連帯感という課題が先決の問題であるという認識の転換が反映したものである。 以上の2点は、戦後日本の東アジア共同体の展開過程においては、国家間関係からみた地域カテゴリは限定されつつあったのに対し、交流メカニズムはソフトな分野にまで拡大してきたとの特徴の現れであるといえる。
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인지무선네트워크를 위한 회전자 기반 적응형 보안프레임워크 설계
김현성,Kim, Hyunsung 대한전자공학회 2013 전자공학회논문지 Vol.50 No.11
최근 들어 IT 분야에 하나나 그 이상의 기술들이 하나의 장치에 결합되는 융합이 활발히 진행되고 있다. 특히, 기학급수적으로 증가하는 방송 및 통신 시스템으로 인해 무선 주파수 자원의 고갈 문제가 심각하게 대두되고 있다. 이와 같은 주파수 고갈과 비효율적인 주파수 사용 문제를 해결하기 위해 유휴 주파수를 합리적으로 이용하기 위한 융합기술인 인지무선 기술이 많은 관심을 받고 있다. 하지만 융합을 통해 개별적으로 제공되던 기존 서비스에 새로 개발된 기술들이 결합됨으로서 기존에는 존재하지 않았던 새로운 보안 문제들을 야기할 수 있다. 본 논문의 목적은 통신 융합응용 기술로서 인지무선네트워크를 위한 회전자 기반 적응형 보안프레임워크를 제안한다. 제안한 적응형 보안프레임워크는 위치정보에 기반한 회전자를 프라이버시 및 다양한 보안을 제공하기 위한 보안 기법들에 필요한 공유키 설정을 위한 기초로 이용한다. 본 논문에서 제안한 적응형 보안프레임워크는 인지무선네트워크 표준들을 포함한 다양한 융합응용의 보안 기반 구조로 활용될 수 있을 것이다. Convergence is increasingly prevalent in the IT world which generally refers to the combination of two or more different technologies in a single device. Especially, the spectrum scarcity is becoming a big issue because there are exponential growth of broadcasting and communication systems in the spectrum demand. Cognitive radio (CR) is a convergence technology that is envisaged to solve the problems in wireless networks resulting from the limited available spectrum and the inefficiency in the spectrum usage by exploiting the existing wireless spectrum opportunistically. However, the very process of convergence is likely to expose significant security issues due to the merging of what have been separate services and technologies and also as a result of the introduction of new technologies. The main purpose of this research is focused on devising an adaptive security framework based on carousel for CR networks as a distinct telecommunication convergence application, which are still at the stage of being developed and standardized with the lack of security concerns. The framework uses a secure credential, named as carousel, initialized with the location related information from objects position, which is used to design security mechanisms for supporting privacy and various securities based on it. The proposed adaptive security framework could be used as a security building block for the CR network standards and various convergence applications.
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