• JSTS:Journal of Semiconductor Technology and Science
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• v.5 no.4
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• pp.249-254
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• 2005

This paper presents a system-on-a-chip (SOC) design for digital TV. The single LSI incorporates almost all essential parts such as CPU, ISO/IEC 11172/13818 system/audio/video decoders, a video post-processor, a graphics/OSD processor and a display processor. It has analog IP's inside such as video DACs, an audio PLL, and a system PLL to reduce the system-level implementation cost. Descramblers and Smart Card interface are included to support widely used conditional access systems. The video decoder can decode two video streams simultaneously. The DSP-based audio decoder can process various audio coding specifications. The functional blocks for video quality enhancement also form outstanding features of this SoC. The SoC supports world-wide major DTV services including ATSC, ARIB, DVB, and DIRECTV.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.10a
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• pp.59-60
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• 2013

In this paper, we implemented a digital doorlock using microprocessor Atemega128 made in Atmel. We added RFID reader to identify different existing Doorlock. To operate the system, first, if RFID reader recognize card, LCD is used to operate password input message. Second, if password is correct, door is opened. But if password is incorrect, door will not be open. To extend security intensity for opening door key, we used RFID module and can operate it easily.

• Journal of Digital Convergence
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• v.11 no.11
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• pp.675-682
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• 2013

This paper tries to solve the problems which previous methods have the model using smart card for protecting digital contents. This study provides a contents distribution model to protect the rights of author, distributor, and user as well as user's information by using technologies such as cryptography, DRM(Digital Right Management), access control, etc. The proposed system is evaluated as the most safety model compared with previous methods because it not only solves the problems which the previous methods have, but also protects four type of risks such as use of contents which other mobile devices download, the attack on the key to decode the message, the attack on leaking the contents, and the internal attack such as an illegal reproduction.

• Information Systems Review
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• v.23 no.3
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• pp.177-200
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• 2021

Recently, the use of prepaid electronic payments such as electronic wallets, digital currency and prepaid points is gradually increasing. Prepaid electronic payments has the characteristic of being used after charging first. This study empirically investigated the factors affecting the intention to use online charging in order to help improve the service that require prepaid recharge by applying transformed TAM. Since there are not many previous studies for the intention to use online charging, we extract factors through preceding researches for electronic cash and mobile easy payment. Also we analyze the intention to use online charging for transportation card users, focusing on the moderating effects. As a result of the study, it was found that 'convenience', 'ubiquity', and 'self-efficacy' among the independent variables had a positive (+) effect on mediation variable 'perceived usefulness'. 'Perceived usefulness' was analyzed to have a significant influence on the dependent variable 'usage intention'. According to users' gender, internet usage time, internet shopping frequency, online charging frequency and transportation card usage type, the moderating effect was significant on 'perceived usefulness' and 'usage intention'. As an implication, it was suggested that service improvement and differentiated marketing are needed in direction of increasing the usefulness of services. Additional research directions were proposed for services such as e-wallets, prepaid points and digital currencies by adding other factors and moderate variables.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.26 no.2
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• pp.345-358
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• 2016

In this paper, we present a security tool which called Digital Legal Seal. The Digital Legal Seal scans a barcode on a paper and print it with the tag generated by Hash-based Message Authentication Code(HMAC) in text format on a display device. The result of HMAC can be used for user authentication or secure message transmission on both online and offline. We examine not only how the Digital Legal Seal can make up the weak points of security card and OTP (One Time Password), but also the possibility of reducing the forgery of promissory note on offline.

• Management & Information Systems Review
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• v.2
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• pp.23-46
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• 1998

In this paper, comparative and analysis of multimedia author tools for to proper compatible multimedia author tools on multimedia author tools function and usage, and which breach of contract each author tools specific property prepare to forecast future multimedia expansion trend on information technology expansion. Multimedia essential element is hardware(storage, digital video, CD), software, sound, hypertext and hypermedia etc. Analysis criteria of multimedia author tools is programming environment, which are card, script, icon, time method.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 1996.11a
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• pp.366-373
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• 1996

본 논문에서는 IC 카드를 선지불카드로 사용하기 위하여, 카드 내의 데이타를 안전하게 보호할 수 있는 새로운 메카니즘이 제안되었다. 이 메카니즘에서는, 데이타 메모리가 OTPROM 영역과 EEPROM 영역으로 구분되고, 각 영역의 데이타는 논리적으로 서로 연동되게 설계되었다. 그리고 OTPROM영역으로 되어 있는 특정영역에 대해서는 접근제어와 물리적 안전성이 제공되어 재사용 하는 것과 오류를 자동정정하는 것이 가능하다. 이 카드는 디지탈 서명 알고리듬을 사용하여 인증을 받은 사람에 의해서만 발급될 수 있다. 그리고 일반 사용자는 인증과정을 수행하지 않으므로 사용이 간편하다.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2001.11a
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• pp.407-410
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• 2001

본 논문에서는 자바 카드용 ECC (Elliptic Curve Cryptosystems) 및 ECDSA (Elliptic Curve Digital Signature Algorithm) 알고리즘 구현 및 시험 결과에 대해 언급하고자 한다. 163비트 타원곡선 암호시스템(ECC)은 현재 많이 사용되고 있는 RSA 1024 비트 이상의 안전성을 보장한다. 또한, 짧은 키 길이를 사용하기 때문에 메모리와 처리능력이 제한된 스마트 카드나 이동 통신 등과 같은 분야에서 매우 유용하게 사용될 수 있으며, ECC나 ECDSA를 자바 카드 상에 구현하여 사용함으로써 사용자들은 보다 강화된 보안성과 안전성을 제공받을 수 있을 것이다.

• Proceedings of the KAIS Fall Conference
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• 2000.10a
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• pp.203-207
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• 2000

최근 신호 처리 분야에서 많은 연구가 되고 있는 웨이브렛 변환을 적용하고, DSP(Digital Signal Processor)인 TMS320C31을 사용하여 고속 처리 가능한 하드웨어를 구현하였다. 그리고, 컴퓨터하고 일정한 통신 대역을 유지하고 다른 장치에 영향을 주지 안기 위해서 ISA 버스를 사용하였다. 여기서는 웨이브렛 변환과 푸리에 변환의 차이 및 필터뱅크에 대해서 알아보고, DSP를 이용하여 웨이브렛 변환을 시키는 하드웨어를 구현했다.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.11a
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• pp.673-674
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• 2009

전자신분증 시스템을 구현하기 위해서는 여러 가지 보안요소들이 고려되어야 한다. 본 논문에서는 Hash Tree와 Keyed Hash를 이용하여 전자신분증 시스템에 효율적으로 적용될 수 있는 메시지 인증(Message Authentication) 프토토콜을 제안한다.