• Proceedings of the KIEE Conference
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• 2007.10a
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• pp.165-166
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• 2007

특수 분장을 이용하여 매우 정교하게 제작된 가면을 쓴 얼굴 위변조의 경우 일반적인 밝기 영상으로는 검출이 용이하지 않다. 최근의 획기적인 특수 분장 기술 발전을 고려할 때 성공적인 얼굴 인식시스템 개발을 위해 가면을 쓴 얼굴 위변조 검출 연구는 매우 중요하다. 본 연구에서는 물질의 재질에 따른 반사율의 차이를 기반으로 가면을 착용하는 얼굴 위변조를 검출하는 방법을 제안한다. 우선 알비도(albedo)에 착안하여 여러 파장대의 조명에 대해 실험하였다. 실제 얼굴 인식 시스템의 적용 환경을 고려할 때 알비도를 단순히 빛의 반사량으로 간략화 할 수 있음을 보였고, 실험결과 850nm 적외선 조명이 적합하다는 결론을 얻었다.

• Vending industry
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• v.7 no.2 s.20
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• pp.54-58
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• 2007

지난 7월 10일 MBC뉴스 데스크는 가짜 지폐도 입수하는 '눈먼 자판기' 실태를 고발 취재해 큰 반향을 불러 일으켰다. 지폐식별기의 생명이 품질 신뢰성인데 위폐에 뻥뻥 뚫리는 제품들이 유동되고 있다는 사실은 충격적이었다. 이같은 현상은 자판기에 대한 큰 불신을 초래할 뿐만 아니라 모방범죄 및 조직적 위폐 확산을 불러일으킬 가능성이 크다는 점에서 심각한 문제가 아닐 수 없다. 그 동안 지폐식별기 분야가 품질에 대한 신뢰성을 철저히 검증하지 못하고 양적인 시장 확대에만 매달린 폐단이 비로소 나타나고 있는 것이다. 그나마 다행이라면 위폐문제가 일찌감치 공론화가 되어 산업계가 품질에 대해 경각심을 가질 수 있게 되었다는 점이다. 제품이 우후죽순처럼 깔린 상항에서 문제가 불거지면 걷잡을 수 없는 상황에 빠질 수 있지만, 산업계는 이제라도 적극적인 대책을 마련한다면 전화위복의 기회로 삼을 수가 있다. 협회에서도 사태의 심각성을 반영, 산업계의 현명하고도 신속한 대응을 위해 자판기 관련 업체를 대상으로 "신권용 지폐식별기 '위변조 지폐 사용 확산방지'를 위한 협조 요청" 공문을 발송했다. 산업계가 위변조 지폐 입수 사태에 대해 적극적인 대응책을 모색하려면 현재의 문제점에 대한 엄밀히 진단하는 것이 우선시되어야 한다. 불거진 위변조 지폐 입수 실태의 면면을 살펴보고, 산업계가 어떠한 대책을 마련해야 하는 지를 진단했다.

• Convergence Security Journal
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• v.16 no.1
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• pp.81-87
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• 2016

In this paper, we propose a forgery/falsification detection technique of web site using the images. The proposed system captures images of the web site when a user accesses to the forgery/falsification web site that has the financial information deodorizing purpose. The captured images are compared with those of normal web site images to detect forgery/falsification. The proposed system calculates similarity factor of normal site image with captured one to detect whether the site is normal or not. If it is determined as normal, analysis procedure is finished. But if it is determined as abnormal, a message informs the user to prevent additional financial information spill and further accidents from the forgery web site.

• Journal of Convergence Society for SMB
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• v.5 no.1
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• pp.37-40
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• 2015

Recently range of use also being increase along with smart phone users growing. And keep pace with hacking technician is increasing inter alia tamper technician has issued. This technician infringe integrity on three element of security of data. In this case reliability has deteriorated, the app itself has increased danger, and it's value has reduced. This can affect like take information even though don't have any authority to information or hemorrhage at large in this country. In other words, I has been arranged tamper's definition to.

• Journal of Korea Multimedia Society
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• v.12 no.8
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• pp.1120-1127
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• 2009

The commensurate number of the attacks and infringement targeting a vulnerability of the game service has been increasing constantly, due to the dramatic growth and expansion of the impact of the game industry. However, there exist no subsequent researches for the differentiated technology, which is to prevent the reverse function of the game service. Therefore, in this study, we examined the current status of infringement toward online game services which are provided in the market currently and designed the proper technical measures for a manipulation of the game service which is the most vulnerable part. We have encrypted an execution file and decrypted it in real time process. Furthermore, we conducted debugging, disassemble, and prevented a its own memory dump, also concealed the information to overcome the module dependency to preclude a manipulation.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.42 no.1
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• pp.250-256
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• 2017

Recently, the use of mobile devices has increased in order to provide a variety of services, and thus there has been a surge in the number of application malicious attacks on the Android platform. To resolve the problem, the domestic financial sector has been introducing the app anti-tamper solution based on cryptographic algorithms. However, since the capacity of apps installed in smartphones continues to increase and environments with limited resources as wearables and IoTs spread, there are limitations to the processing speed of the anti-tamper solutions. In this paper, we propose a novel anti-tamper solution by using lightweight hash function LEA and LSH. We also present the test results of a simulation program that implements this method and compare the performance with anti-tamper solutions based on the previous cryptographic algorithms.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.24 no.5
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• pp.871-883
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• 2014

New types of attacks that mainly compromise the public, portal and financial websites for the purpose of economic profit or national confusion are being emerged and evolved. In addition, in case of 'drive by download' attack, if a host just visits the compromised websites, then the host is infected by a malware. Website falsification detection system is one of the most powerful solutions to cope with such cyber threats that try to attack the websites. Many domestic CERTs including NCSC (National Cyber Security Center) that carry out security monitoring and response service deploy it into the target organizations. However, the existing techniques for the website falsification detection system have practical problems in that their time complexity is high and the detection accuracy is not high. In this paper, we propose website falsification detection system based on image and code analysis for improving the performance of the security monitoring and response service in CERTs. The proposed system focuses on improvement of the accuracy as well as the rapidity in detecting falsification of the target websites.

• KIPS Transactions on Computer and Communication Systems
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• v.5 no.7
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• pp.173-180
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• 2016

Since smartphones possess a variety of user information, we can derive useful data related to the case from app data analysis in the digital forensic perspective. However, it requires an appropriate forensic measure as smartphone has the property of high mobility and high possibility of data loss, forgery, and modulation. Especially the forged/modulated time-stamp impairs the credibility of digital proof and results in the perplexity during the timeline analysis. This paper provides traces of usage which could investigate whether the time-stamp has been forged/modulated or not within the range of iOS based devices.

• The KIPS Transactions:PartC
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• v.9C no.2
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• pp.173-180
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• 2002

Smartcard is highlighted as infrastructure that has an excellent security for executing functions such as user authentication, access control, information storage and control, and its market is expanding rapidly. But possibilities of forgery and alteration by hacking are increasing as well. This Paper makes cut off of Smartcard forgery and alteration that use angular multiplexing and private key multiplexing hologram on holographic security Encryption, and proposes system capable verfication of forgery and alteration impossible on existing smartrard by adopting smartcard chip and holographic memory chip.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04a
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• pp.503-505
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• 2003

현재 인터넷을 통한 상대방의 신뢰성을 보장해 주는 인증서 사용이 빈번해지고 있다. 그러나 오프라인상의 전자문서는 상대방의 신뢰성 보장과 전자문서의 위변조의 위험성이 많다. 또한 전자문서는 오프라인상의 이동성에 제악을 받게 된다. 본 논문에서는 이러한 문제를 해결하고, 사용자가 온라인과 오프라인에서도 사용하게 편리하도록 문서내용, 문서작성자의 인증서 그리고 전자서명값을 이차원 바코드로 변환하여 출력된 전자문서에서 상대방의 신뢰성과 문서의 무결성을 보장하도록 제안한다. 제안된 시스템에서는 문서내용, 문서작성자의 인증서, 전자서명값을 변환해 출력문서에 이차원 바코드를 첨부하게 된다. 출력된 문서에서 첨부된 이차원 바코드를 스케닝 하고 문서내용, 문서작성자의 인증서 그리고 전자서명값을 얻어오고 검증을 통해 위변조 여부 판단하여 상대방의 신뢰성과 문서의 무결성을 확인 하도록 한다.