• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.10a
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• pp.215-218
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• 2010

Smart Phone with domestic demand increasing rapidly, the utilization of multimedia services have become diverse. Accordingly, Smart Phone users to hack their Jail Breaking and Rooting and illegal use of the multimedia content is copyrighted. Also relevant to mobile communication terminal as a high crime, create, and the digital evidence increases the utilization of the mobile forensic evidence is required to study. In this paper, Smart Phone Copyright Violation and Forensic Apply Method research. Smart Phone Status and related violations of copyright infringement, broadcasting, film, music, e-book, etc. for each survey item, and how to apply for forensics were studied. This study investigated the development and forensic science will be able to contribute to the development.

• Review of KIISC
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• v.21 no.6
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• pp.57-66
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• 2011

국내 스마트폰의 사용자는 2천만 명에 도달하고 있고, Wi-Fi Zone과 3G망 뿐만 아니라, 4G WiBro와 LTE로 속도까지 향상 되어 스마트폰의 활용은 더욱 높아지고 있다. 또한 일부 스마트폰 사용자들은 본인의 스마트폰 단말기를 해킹과 루팅을 통하여 멀티미디어 콘텐츠를 불법으로 이용하고 있다. 이는 한 미 FTA체결에 저작권의 법적 문제제기가 있다. 또한 기존의 이동통신 2G, 3G 휴대폰들과 스마트폰은 휴대용 이용기기로서, 범죄에 사용되는 직간접 증거들과 관련성이 높아서, 휴대폰과 스마트폰에서 생성 저장된 디지털 증거에 대한 스마트폰 포렌식 적용에 대한 연구가 필요하다. 스마트폰은 휴대폰 보다 다양한 기능을 지원해주기 때문에 스마트폰의 사용정보에는 연락처, 통화기록, 인터넷, 메세지, 사진, 동영상 등의 많은 정보를 가지고 있으며 이러한 정보는 포렌식 수사 과정에서 사용자의 행위를 유추하는데 도움이 될 수 있다. 본 디지털 증거 수집과 분석을 위한 스마트폰 포렌식 적용에서는 법정에서 사용될 포렌식 증거의 수집과 분석을 위한 압수 수색 방법과 주의할 점을 연구하였다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.11
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• pp.2491-2496
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• 2010

Smart Phone with domestic demand increasing rapidly, the utilization of multimedia services have become diverse. Smart Phone users use the copyrighted multimedia contents illegally from hacking their Smart Phone with Jail Breaking and Rooting. Legal issues according to the Korea-U.S. FTA. and high relevance with crime as mobile communication terminal, the utilization of created and saved digital evidence is high, the mobile forensic evidence study is required. This paper studied method and notice of legal seizure and search assuming the Smart Phone copyright violation. Research the status of Smart Phone copyright violation and related violation by category as broadcasting, movies, music, e-book etc. Research the method of submit a report to the court by applying techniques to forensic. The results of this research will contribute to the provide of Smart Phone crime evidence and mobile forensic technology.

• Proceedings of the Korean Society of Computer Information Conference
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• 2011.06a
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• pp.149-153
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• 2011

2010년에는 국내에 Smart Phone이 확산되면서, Smart Phone은 단순한 음성통신정보 전달 이외에 기존의 인터넷 PC가 정보를 전달 할 수 있는 전자책, 영화, 음악, 콘텐츠 영역으로 확장되고 있다. 하지만 Smart Phone 사용자들은 멀티미디어 저작권 콘텐츠를 불법으로 이용하고 있다. 또한 이동통신 단말로서 Smart Phone관련 범죄 증거의 생성, 저장된 디지털 증거는 증거의 활용도가 높아 모바일 포렌식 연구가 필요하다. 본 논문에서 Smart Phone에서 저작권 위반 내용들을 전자책, 영화, 음악, 콘텐츠 영역으로 조사한다. 저작권 위반 Smart Phone 증거자료를 추출하고 분석하기 위한 SYN 방식과 JTAG 방식을 연구한다. Smart Phone SYN 방식과 JTAG 방식으로 Smart Phone의 저작권 위반 자료를 추출하여 복원하고, 자료를 분석하였다. 본 연구 결과는 저작권위반 단속 기술 향상과 포렌식 수사 기술 발전에 기여 할 수 있을 것이다.

• KIPS Transactions on Software and Data Engineering
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• v.6 no.1
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• pp.15-22
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• 2017

With the advance of Internet Technology, various social network services are created and used by users. Especially, the use of smart devices makes that multimedia contents can be used and distributed on social network services. However, since the crime rate also is increased by users with illegal purposes, there are needs to protect contents and block illegal usage of contents with multimedia forensics. In this paper, we propose a multimedia forensic technique which is identifying the video source. First, the scheme to acquire the sensor pattern noise (SPN) using morphology filtering is presented, which comes from the imperfection of photon detector. Using this scheme, the SPN of reference videos from the reference device is estimated and the SPN of an unknown video is estimated. Then, the similarity between two SPNs is measured to identify whether the unknown video is acquired using the reference device. For the performance analysis of the proposed technique, 30 devices including DSLR camera, compact camera, camcorder, action cam and smart phone are tested and quantitatively analyzed. Based on the results, the proposed technique can achieve the 96% accuracy in identification.

• KIPS Transactions on Software and Data Engineering
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• v.4 no.12
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• pp.561-570
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• 2015

With the advance of IT technology, contents from digital multimedia devices and softwares are widely used and distributed. However, novice uses them for illegal purpose and hence there are needs for protecting contents and blocking illegal usage through multimedia forensics. In this paper, we present a forensic technique for identifying digital imaging source using sensor pattern noise. First, the way to acquire the sensor pattern noise which comes from the imperfection of photon detector against light is presented. Then, the way to identify the similarity of digital imaging sources is explained after estimating the sensor pattern noises from the reference images and the unknown image. For the performance analysis of the proposed technique, 10 devices including DSLR camera, compact camera, smartphone and camcorder are tested and quantitatively analyzed. Based on the results, the proposed technique can achieve the 99.6% identification accuracy.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.48 no.4
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• pp.27-34
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• 2011

In this paper, it was presented a design on the dynamic multimedia fingerprinting code for anti-collusion code(ACC) in the protection of multimedia content. Multimedia fingerprinting code for the conventional ACC, is designed with a mathematical method to increase k to k+1 by transform from BIBD's an incidence matrix to a complement matrix. A codevector of the complement matrix is allowanced fingerprinting code to a user' authority and embedded into a content. In the proposed algorithm, the feature points were drawing from a content which user bought, with based on these to design the dynamical multimedia fingerprinting code. The candidate codes of ACC which satisfied BIBD's v and k+1 condition is registered in the codebook, and then a matrix is generated(Below that it calls "Rhee matrix") with ${\lambda}+1$ condition. In the experimental results, the codevector of Rhee matrix based on a feature point of the content is generated to exist k in the confidence interval at the significance level ($1-{\alpha}$). Euclidean distances between row and row and column and column each other of Rhee matrix is working out same k value as like the compliment matrices based on BIBD and Graph. Moreover, first row and column of Rhee matrix are an initial firing vector and to be a forensic mark of content protection. Because of the connection of the rest codevectors is reported in the codebook, when trace a colluded code, it isn't necessity to solve a correlation coefficient between original fingerprinting code and the colluded code but only search the codebook then a trace of the colluder is easy. Thus, the generated Rhee matrix in this paper has an excellent robustness and fidelity more than the mathematically generated matrix based on BIBD as ACC.

• Proceedings of the Korea Multimedia Society Conference
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• 2012.05a
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• pp.231-233
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• 2012

컴퓨터 및 프린터 기술의 발전으로 디지털 문서 활용 사례가 전 분야에 확산되면서 디지털 문서의 위 변조 범죄가 증가하고 많은 사회적인 문제를 야기하고 있다. 이러한 컴퓨터를 이용한 범죄의 증거를 수집하고 분석하기 위해 디지털 포렌식 기술의 발전이 더욱 중요해지고 있다. 디지털 포렌식은 PC나 휴대폰 등 각종 디지털 매체 등에 남아 있는 디지털 정보들을 수집 분석해 범죄 단서를 찾는 컴퓨터 법의학이다. 본 논문에서는 프린터기로 출력된 문서의 고해상도 영상현미경 이미지를 사용하여 원본 여부를 판별 할 수 있는 프린터기 동일 여부 판별 기술을 제안한다.

• Journal of Korea Multimedia Society
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• v.12 no.4
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• pp.550-558
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• 2009

In ubiquitous environment, more small, lightweight, cheap and movable device is used than one device used in wired network environment. Multimedia service which is anytime, anywhere, is provided by device. However, it does not ensure the fair use of multimedia contents and causes damage to the contents providers because of illegal copy and distribution and indiscriminate use of digital contents. For solving this problems, DRM is applied to wired network but it has the problems does not protect stored license and manage license completely because of depending on simple protection such as device authentication and cryptographic algorithm. This paper proposes the license management model using digital forensic and DRM that prevents contents and licenses from distributing illegally and also enables the creation of evidence for legal countermeasure and the protection of license in whole life cycle.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.18 no.6A
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• pp.185-190
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• 2008

The devices for the digital home in ubiquitous environment aim at providing multimedia services which are not limited to the time and space. However, it does not ensure the fair use of digital contents and causes damage to the contents providers because of indiscriminate distribution of digital contents and the use of illegal contents. DRM system for solving this problems cannot protect the license stored on digital home devices and manage license by redistribution of contents. In this paper, digital forensic model that enables the misuse detection and previous interception of large-scale illegal distribution for contents and license, and also enables the creation and management of digital evidence for legal countermeasure.