• Journal of Communications and Networks
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• 제7권2호
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• pp.222-230
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• 2005

This article presents a field evaluation of an IP-based architecture for heterogeneous environments that has been developed under the aegis of the Moby Dick project, covering UMTS-like (universal mobile telecommunications system) TD-CDMA (time division-code division multiple access) wireless access technology, wireless and wired LANs. The architecture treats all transmission capabilities as basic physical and data-link layers, and replaces all higher-level tasks by IP-based strategies. The Moby Dick architecture incorporates mobile IPv6, fast handovers, AAA-control (authentication, authorisation, accounting), charging and quality of service (QoS) in an integrated framework. The architecture further allows for optimised control on the radio link layer resources. It has been implemented and tested by expert users, and evaluated by real users on field trials with multiple services available.

• 디지털산업정보학회논문지
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• 제4권2호
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• pp.57-66
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• 2008

There have been proposed various copyright protection protocols in network-based digital multimedia distribution framework. However, most of conventional copyright protection protocols are focused on the stability of copyright information embedding/extracting and the access control to data suitable for user's authority but overlooked the privacy of copyright owner and user in authentication process of copyright and access information. In this paper, we propose a solution that builds a privacy-preserving proof of copyright ownership of digital contents in conjunction with keyword search scheme. The appeal of our proposal is three-fold: (1) content providers maintain stable copyright ownership in the distribution of digital contents; (2) the proof process of digital contents ownership is very secure in the view of preserving privacy; (3) the proposed protocol is the copyright protection protocol added by indexing process but is balanced privacy and efficiency concerns for its practical use.

• 한국컴퓨터그래픽스학회논문지
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• 제9권2호
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• pp.1-9
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• 2003

Information assurance(IA) refers to methodologies to protect engineering information by ensuring its availability, confidentiality, integrity, non-repudiation, authentication, access control, etc. In collaborative design, IA techniques are needed to protect intellectual property, establish security privileges and create "need to know" protections on critical features. Aside from 3D watermarking, research on how to provide IA to distributed collaborative engineering teams is largely non-existent. This paper provides a framework for information assurance within collaborative design, based on a technique we call role-based viewing. Such role-based viewing is achieved through integration of multi-resolution geometry and security models. 3D models are geometrically partitioned, and the partitioning is used to create multi-resolution mesh hierarchies. Extracting an appropriately simplified model suitable for access rights for individual designers within a collaborative design environment is driven by an elaborate access control mechanism.

• Journal of Information Processing Systems
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• 제13권4호
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• pp.970-986
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• 2017

Certificateless public key cryptography (CL-PKC) is a new benchmark in modern cryptography. It not only simplifies the certificate management problem of PKC, but also avoids the key escrow problem of the identity based cryptosystem (ID-PKC). In this article, we propose a certificateless blind signature protocol which is based on elliptic curve cryptography (CLB-ECC). The scheme is suitable for the wireless communication environment because of smaller parameter size. The proposed scheme is proven to be secure against attacks by two different kinds of adversaries. CLB-ECC is efficient in terms of computation compared to the other existing conventional schemes. CLB-ECC can withstand forgery attack, key only attack, and known message attack. An e-cash framework, which is based on CLB-ECC, has also been proposed. As a result, the proposed CLB-ECC scheme seems to be more effective for applying to real life applications like e-shopping, e-voting, etc., in handheld devices.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2014년도 추계학술발표대회
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• pp.520-522
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• 2014

Due to the availability of easy-to-use and powerful image editing tools, the authentication of digital images cannot be taken for granted and it gives rise to non-intrusive forgery detection problem because all imaging devices do not embed watermark. Forgery detection plays an important role in this case. In this paper, an effective framework for passive-blind method for copy-move image forgery detection is proposed, based on Gabor filter which is robust to illumination, rotation invariant, robust to scale. For the detection, the suspicious image is selected and Gabor wavelet is applied from whole scale space and whole direction space. We will extract the mean and the standard deviation as the texture features and feature vectors. Finally, a distance is calculated between two textures feature vectors to determine the forgery, and the decision will be made based on that result.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2014년도 추계학술대회
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• pp.373-374
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• 2014

Radio frequency identification system (RFID) is an automatic technology and aids machines or computers to identify objects, record metadata or control individual target through radio waves. Connecting RFID reader to the terminal of Internet, the readers can identify, track and monitor the objects attached with tags globally, automatically, and in real time, if needed. This is the so-called Internet of Things (IoT). RFID is often seen as a prerequisite for the IoT. This paper introduces amd surveyed the technologies of RFID and IoT, discusses the applications and challenges of RFID technology used in IoT.

• Journal of information and communication convergence engineering
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• 제16권4호
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• pp.235-241
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• 2018

Recently, deep learning has been actively studied and applied in various fields even to novel writing and painting in ways we could not imagine before. A key feature is that high-performance computing device, especially CUDA-enabled GPU, supports this trend. Researchers who have difficulty accessing such systems fall behind in this fast-changing trend. In this study, we propose and implement a library called Emulearner that helps users to utilize Emulab with ease. Emulab is a research framework equipped with up to thousands of nodes developed by the University of Utah. To use Emulab nodes for deep learning requires a lot of human interactions, however. To solve this problem, Emulearner completely automates operations from authentication of Emulab log-in, node creation, configuration of deep learning to training. By installing Emulearner with a legitimate Emulab account, users can focus on their research on deep learning without hassle.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2020년도 춘계학술발표대회
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• pp.235-237
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• 2020

해킹메일로 인한 피해는 꾸준히 발생하고 있으며, 최근에는 정부나 공공기관을 사칭하는 메일로 인한 피해 사례가 증가하고 있어 정부에서는 사칭메일을 대응하기 위한 기술을 적용하도록 요구하고 있다. 2017년부터 한국인터넷진흥원에서는 이메일 주소를 사칭하는 메일을 차단하기 위해서는 SPF(Sender Policy Framework) 기술을 적용해야 한다고 밝혔으며, 2019년에 정부에서는 SPF 뿐만 아니라 DKIM(Domain Keys Identified Mail)과 DMARC(Domain-based Message Authentication, Reporting, and Conformance)까지 적용을 확대할 것을 요구하고 있다. 이에, 본 논문에서는 해킹메일 대응을 위해 적용하고 있는 세 가지 기술의 기술 표준을 분석함으로써 해당 기술을 적용하여 나가기 위한 발판을 마련하고자 한다.

• 정보보호학회논문지
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• 제16권5호
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• pp.93-106
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• 2006

무선 인터넷 통신의 빠른 성장으로 차세대 이동 단말들에서 이미지, 음악, 비디오 및 응용들과 같은 무선 디지털 콘텐츠들의 배포가 가능하게 되었다. 불법 복사 방지, 사용 권한 제어, 인증 기능이 없는 상태에서 이동 단말이 빠른 속도로 통신 채널을 확대하기 위한 주요 수단이 되면, 인증되지 않은 이동 단말을 통해 무선 디지털 콘텐츠는 불법적으로 복사, 편집, 배포된다. 본 논문은 일반적인 OMA DRM v2.0의 목적과 기능에 대해서 살펴본다. OMA는 모바일 DRM을 위한 공개 표준을 개발하고 있는 유일한 곳이다. 다음으로 능동형 콘텐츠의 특징에 대해서 소개하고, 능동형 콘텐츠와 수동형 콘텐츠의 차이에 대해서 설명한다. 능동형 콘텐츠를 빠르게 재생하기 위한 OMA 기반 DRM 프레임워크를 제안한다. 본 프레임 워크에는 콘텐츠 부분 암호화를 위한 DCF 확장, 콘텐츠 암호화 키 관리, 능동형 콘텐츠를 위한 렌더링 API가 포함된다. 실험 결과는 제안한 방법을 통해 QoE를 만족할 수 있는 정도로 충분히 빠르게 능동형 콘텐츠를 렌더링 할 수 있음을 보여 준다 본 프레임워크는 이동 단말 환경을 위해 제안된 것이지만, 휴대용 재생기, 셋탑 박스, 개인 컴퓨터에서도 적용할 수 있다.

• 정보보호학회논문지
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• 제14권3호
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• pp.3-12
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• 2004

보안운영체제는 운영체제에 내재된 보안상의 결함으로 인하여 발생할 수 있는 각종 해킹으로부터 시스템을 보호하기 위해서 기존 운영체제에 다양한 보안기능을 추가한 운영체제이다. 보안운영체제는 시스템 보안을 목적으로 고안되었으나 전체 시스템의 안전을 위해서는 네트워크 측면에서의 보안이 필수적이다. 이를 위해서 IPsec이나 SSL과 같은 네트워크 보안 프로토콜들이 개발되어 사용되고 있으나 정책이나 키 관리에 많은 주의를 필요로 하고 보안운영체제의 특성을 반영하기 어렵다. 본 논문에서는 보안운영체제 사이에서 안전한 통신을 제공하기 위한 간단한 신뢰채널 메커니즘을 소개한다. 본 신뢰채널은 네트워크 트래픽에 대해 기밀성과 인증 서비스를 제공하며, 보안운영체제에 사용되는 특정 보안정보를 전달할 수 있는 구조를 가진다. IP 계층의 커널 수준에서 구현된 신뢰채널은 단순한 처리구조를 통하여 신뢰채널 처리과정에서 발생할 수 있는 오버헤드를 줄일 수 있다.