• The Journal of Korean Institute of Communications and Information Sciences
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• 제39B권4호
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• pp.207-215
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• 2014

Password based authentication systems are most widely used for user convenience in web services. However such authentication systems are known to be vulnerable to various attacks such as password guessing attack, dictionary attack and key logging attack. Besides, many of the web systems just provide user authentication in a one-way fashion such that web clients cannot verify the authenticity of the web server to which they set access and give passwords. Therefore, it is too difficult to protect against DNS spoofing, phishing and pharming attacks. To cope with the security threats, web system adopts several enhanced schemes utilizing one time password (OTP) or long and strong passwords including special characters. However there are still practical issues. Users are required to buy OTP devices and strong passwords are less convenient to use. Above all, one-way authentication schemes generate several vulnerabilities. To solve the problems, we propose a multi-channel, multi-factor authentication scheme by utilizing QR-Code. The proposed scheme supports both user and server authentications mutually, thereby protecting against attacks such as phishing and pharming attacks. Also, the proposed scheme makes use of a portable smart device as a OTP generator so that the system is convenient and secure against traditional password attacks.

• Journal of the Korea Institute of Information and Communication Engineering
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• 제18권1호
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• pp.78-83
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• 2014

This paper suggest an effective idea to implement an low area multi-mode one dimension transform block of HEVC(High Efficiency Video Coding). The time consuming multiplier path is designed to operate on low frequency. Normal multipliers dealing with variable operands are replaced with smaller constant multipliers which do the product with constant coefficient and variable only using shifters and adders. This scheme increases total multiplier counts but entire areas are reduced owing to smaller area of constant multiplier. Idle cycles caused by doubled multipliers enable to use multi-cycle paths on the cycle eating multiplier data path. Operating frequency is lowered by multi-cycle path but total throughput is maintained. This structure is implemented with TSMC 0.18 CMOS process library, and operated on 186MHz frequency to process a 4k($3840{\times}2160$) image. Max operating frequency is 300MHz.

• Journal of the Korea Society for Simulation
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• 제20권1호
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• pp.39-49
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• 2011

Nowaday, Many equipments like TabletPC, Digital kiosk, ATM using touch-panel service instead of keyboard or button, to support intuitively input for user. Furthermore these days touch-panels recognize up to 5 contact points using recent technology. On this study, I Introduce password input/store methodology on multi-touch environment. On past, User must input password 1 character by 1 character, like [1, 2, 3, 4]. but, on multi-touch environment user can input more than one character at the same time, like [(1,3), 2, (3,4), (1,2,3)]. In result, users can use password more intensely. This study is utilized post security technology study on multi-touch environment.

• Journal of KIISE:Information Networking
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• 제30권3호
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• pp.387-396
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• 2003

In this paper, we present more efficient Protocol than that of Ford and Kaliski. We use RSA in the roaming protocol and it Plays decisive role to reduce the total time cost. We show that our protocol is safe from various attacks. We present the performance of our protocol and verify that This protocol needs fewer secure channel like SSL than other protocols.

• The Journal of the Korea Contents Association
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• 제11권11호
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• pp.413-423
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• 2011

Service environments are known to have effects on quality recognition in fine-dining and family type restaurants. The current study explores that the effects are also likely in the fast-food type ones. To verify the research method factor and reliability analysis of SPSS version 18.0 are applied. The program is also used to test the influences among variables. With multiple regression analysis the study finds that there is a significant effect of service environment on quality recognition in fast-food type restaurants. The study also finds that employees' uniform and cleanliness are more influential than waiting time which is generally known as a key factor in fast food service restaurants.

• Proceedings of the Korean Information Science Society Conference
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• 한국정보과학회 2003년도 봄 학술발표논문집 Vol.30 No.1 (B)
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• pp.301-303
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• 2003

기존의 아이디와 패스워드를 이용한 사용자 인증방식의 문제점 및 한계를 해결하기 위하여 생체인식 기술 (Biometric technology)이 연구되었다. 하지만 단일 생체인식 기술은 오인식률(False Acceptance Rate), 오거부율(False Rejection Rate)등의 문제점을 가지고있다. 최근에 단일 생체인식 기술의 한계를 극복하고 사용자 인증 성능 향상과 신뢰도를 높이기 위하여 다중 생체 인식(Multi-modal biometrics)에 관한 연구개발이 활발하다. 이 논문은 지문인식과 얼굴인식 기술을 활용하여 사용자 인증을 수행함으로써 단일 시스템에서 발생하는 한계점을 극복함과 동시에 좀더 안정적인 사용자 인증이 가능한 방법을 제시한다.

• Proceedings of the Korea Information Processing Society Conference
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• 한국정보처리학회 2011년도 추계학술발표대회
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• pp.1017-1020
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• 2011

터치스크린은 키보드나 마우스와 같은 입력장치를 사용하지 않고, 스크린에 손가락, 펜 등을 접촉하여 입력하는 방식이다. 터치스크린은 정확성, 입력속도, 문자입력 등에서는 개선이 필요하나, 누구나 쉽게 입력할 수 있는 장점으로 인해 기존에는 현금인출기, 키오스크(Kiosk) 등 공공분야에서 주로 많이 사용되어 왔다. 터치스크린은 손가락을 접촉하는 것만으로 컴퓨터, 모바일 기기 등을 직관적으로 쉽게 사용할 수 있다는 것이 가장 큰 장점이다. 현재는 단순 터치스크린 환경을 넘어 동시 다중 입력이 가능한 멀티터치 환경의 터치스크린이 상용화 되면서 동시 다중 입력을 통한 어플리케이션들이 주목받고 있다. 본 논문에서는 동시에 입력한 여러 개의 아이템을 인식하는 방법을 다중 입력 패스워드를 통해 시뮬레이션 해보았다. 선택된 아이템으로 리스트를 구성하고 이를 동시 입력 단위로 사용함으로써 사용자 입장에서의 다중 입력의 정확성과 시스템 입장에서의 인식률을 높이고자 하였다.

• Journal of the Korea Institute of Information Security & Cryptology
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• 제23권3호
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• pp.351-358
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• 2013

In 2008, Pointcheval and Zimmer have presented multi-factor authenticated key exchange protocol with client's secret key, password, biometrics. However, it has been found to be flawed by Hao and Clarke if an attacker has single authentication factor (password), then the attacker can deduce other authentication factors. Interestingly, its countermeasure has not been presented due to the difficulty of design and structural problem. In this paper, an efficient countermeasure is briefly presented and its security is discussed as well.

• The Journal of Korean Institute of Communications and Information Sciences
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• 제32권10C호
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• pp.1025-1031
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• 2007

This paper proposes an area-efficient pipeline FFT processor for MIMO-OFDM systems with four transmitting and four receiving antennas. Since the MIMO-OFDM system transmits multiple data streams, the complexity for the MIMO-OFDM system with a single-channel FFT processor increases linearly with the increase of the number of transmit channels. The proposed FFT processor is based on multi-channel structure, and therefore it can efficiently support multiple data streams. With the mixed radix algorithm, the number of non-trivial multiplications of the proposed FFT processor is decreased. The proposed FFT processor is synthesized with CMOS $0.18{\mu}m$ process and reduces the logic gates by 25% over a 4-channel Radix-4 multi-path delay commutator (R4MDC) FFT processor. Since the MIMO-OFDM FFT processor is one of the largest modules in the systems, the proposed FFT processor will be a vast contribution improvement to the low complexity design of MIMO-OFDM systems.

• Proceedings of the Korean Information Science Society Conference
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• 한국정보과학회 2004년도 봄 학술발표논문집 Vol.31 No.1 (A)
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• pp.235-237
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• 2004

어플리케이션 시스템을 사용하려는 사용자에 대한 인증에 관한 문제는 네트워크에 접근하고자 하는 사용자가 실제 의도한 상대인지를 판단하는 것으로써, 서버에서 서비스를 제공하기 전에 만족해야 할 필수적인 요구조건이다. 이와 관련한 많은 연구들이 진행되어 왔는데, 이 중에서 패스워드를 이용한 사용자인증 프로토콜은 여타의 방법에 비해 사용자에게 편리함을 제공할 뿐만 아니라 추가적인 하드웨어를 필요로 하지 않는 다는 장점을 가지고 있다. 최근에는 다중서버를 이용한 프로토콜이 제안되어 기존의 프로토콜 비해 보안이 강화된 서비스를 제공할 수 있게 되었다. 그러나 이 프로토콜은 다중서버를 사용함으로 인해서 부하가 많이 걸린다는 문제점이 존재한다. 본 논문에서는 이러한 다중서버를 이용한 프로토콜을 기반으로 하고 이에 타원곡선 알고리즘을 적용함으로써 컴퓨팅 파워를 줄일 수 있는 방안을 제시하고자 한다.