• KIPS Transactions on Computer and Communication Systems
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• v.2 no.12
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• pp.511-516
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• 2013

The cases of identification forgery and counterfeiting are increasing under the current identification system, which was established based on social conditions and administrative environments over 20 years ago. This leads to an increase of various criminal acts including illegal loan using fake ID and a number of damages caused out of good intentions that result in interference with the operations of public organizations. In addition, according to the advancement of information society, privacy protection has emerged as an important issue. However, ID card exposes individuals' personal information, such as names, resident registration numbers, photos, addresses and fingerprints, and thus the incidents associated with illegal use of personal information are increasing continuously. Accordingly, this study aimed at examining the issues of ID card forgery/counterfeiting and privacy protection and at proposing a next-generation identification system to supplement such weaknesses. The top priority has been set as prevention of forgery/counterfeiting and privacy protection in order to ensure the most important function of national identification system, which is user identification.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.13 no.2
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• pp.81-89
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• 2003

With the rapid development of information and communication technology, online dissemination increases rapidly. So, It becomes more important to protect information. Recently the authentication system using public key infrastructure (PKI) is being utilized as an information protection infrastructure for electronic business transactions. And the smartcard system makes the most use of such an infrastructure. But because the certification based on the current PKI provides oかy basic user certification information, the use has to be limited in various application services that need the identification and authorization information as well as face-to-face information of the user. In order to protect a system from various kinds backings and related treats, we have proposed angular and private key multiplexing for prevention of smartcard forgery and alteration based on a photopolymer cryptosystem. When smartcard becomes prone to forgery and alteration, we should be able to verify it. Also, our parer proposes a new authentication system using multi authentication based on PKI. The smartcard has an excellent advantage in security and moving.

• 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.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.04b
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• pp.959-962
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• 2002

DNSSEC은 IETF에서 논의중인 DNS 보안 표준으로서, DNS에 있어 가장 큰 잠재적 위협인 '도메인 네임에 대응되는 IP주소의 위변조 위협에 대응하기 위해 논의되고 있는 표준이다. 최근 네트워크 환경에서의 최상의 암호화 기법으로 자리잡은 공개키 암호화 기법을 이용하여, 도메인 Zone에 서명을 하여, 이러한 Zone 메시지를 받아보았을 때, 서명을 검증함으로서, DNS메시지가 중간에 위 변조없이 적정한 소스로부터 왔다는 것을 확인하는 것이다. 본 논문에서는 DNSSEC에서 가능한, 계층적 인증방식을 .KR 하위 도메인네임에서 활용할 수 있는 방안으로서, secure resolver를 이용한 도메인네임의 인증을 제시하였다.

• The Journal of Korean Association of Computer Education
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• v.10 no.3
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• pp.57-66
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• 2007

E-mail system is considered as a most important communication media, which can be used to transmit personal information by internet. But e-mail attack also has been increased by spoofing e-mail sender address. Therefore, this work proposes sender verification faculty for spam mail protection at sender's MTA by using security card for protection forged sender and also for authenticating legal sender. Sender's mail MT A requests security card's code number to sender. Then sender input code number and generate session key after sender verification. Session key is used to encrypt sender's signature and secure message transmission. This work can provide efficient and secure e-mail sender authentication with sender verification and message encryption.

• Korea Multimedia Society
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• v.10 no.3
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• pp.73-82
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• 2006

• Journal of IKEEE
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• v.17 no.4
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• pp.537-543
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• 2013

This paper proposed a low EMI spread spectrum clock generator (SSCG) using discontinuous frequency modulation technique. The proposed SSCG is designed for triangular frequency modulation with high modulation depth. When the maximum time interval error (MTIE) of the SSCG is higher than given limit, the output frequency of SSCG is divided by two and used for reducing the time interval error (TIE). This discontinuous frequency modulation technique can effectively reduce the EMI within given limit. The simulated EMI of proposed SSCG was reduced by 18.5dB than that of conventional methods.

• The Journal of the Korea Contents Association
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• v.11 no.12
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• pp.552-559
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• 2011

In this paper, a new image watermarking algorithm is proposed which can hide specific information of an ID card's owner in photo image for preventing ID's photo forgery. Proposed algorithm uses the image segmentation and the correlation peak position modulation of spread spectrum. The watermark embedded in photo ensures not only robustness against printing and scanning but also sufficient information capacity hiding unique number such as social security numbers in small-sized photo. Another advantage of proposed method is extracting accurate information with error tolerance within some rotation range by using $2^h{\times}2^w$ unit sample space not instead $1{\times}1$ pixels for insertion and extraction of information. 40 bits information can be embedded and extracted at $256{\times}256$ sized ID photo with BER value of 0 % when the test condition is 300dpi scanner and photo printer with 22 photos. In conclusion, proposed algorithm shows the robustness for noise and rotational errors occured during printing and scanning.

• 한국IT서비스학회:학술대회논문집
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• 2008.05a
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• pp.590-593
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• 2008

본 논문에서는 SIP 기반의 VoIP 서비스에서 발생 가능한 스팸 위협중 도청을 이용하여 Redirect 서버에서 Proxy 서버로 송신되는 패킷을 불법적으로 위 변조하여 공격하는 기법의 시나리오와 이를 차단하기 위해 발신자 인증 기법을 제안하였다. UAC가 상대편 UAS에게 INVITE 메시지를 송신할 때 Proxy 서버에서 UAS와 연결되어 있는 Proxy 서버의 주소를 알지 못한다면 Redirect 서버에서 질의를 해야 하는데 그때 Redirect 서버는 302 메시지에 Proxy 서버가 요청한 주소를 실어 보내게 된다. 이 302 메시지 패킷을 스패머가 위 변조 할 경우 Proxy 서버는 잘못된 주소가 포함된 INVITE 메시지를 생성하게 되고 스패머와 RTP 세션이 열릴수 있다. 따라서 본 논문에서는 이를 차단하기 위해 인증 메시지가 포함된 ACK 메시지를 정의하여 인증 시스템을 설계하였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2008.06a
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• pp.183-188
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• 2008

디지털 포렌식이 활성화 되고 수사에서 활용하는 사례가 증가함에 따라 기업과 개인을 비롯한 범죄혐의자들의 이에 대응하기 위한 기술도 증가하고 있다. 이를 안티포렌식 또는 항포렌식이라고 하는데 이는 디지털 자료의 변조, 파괴, 은닉 등으로 나누어 볼 수 있다. 본 논문에서는 범죄 수사현장에서 필요한 안티포렌식에 대응하는 기술인 위 변조된 데이터 추출 기법, 슬랙 영역의 숨겨진 데이터 추출 기법, 스테카노 그래픽 추출 및 분석 기법, 암호 복호화 기법, 삭제된 데이터 및 파괴된 데이터 복원 기법을 소개하고, 이에 대한 대비책을 제시한다. 본 연구를 통하여 첨단 범죄 수사관들이 안티디지털포렌식에 대한 새로운 디지털 증거의 추출과 분석에 기여하여 컴퓨터 및 첨단 범죄에 대한 디지털 포렌식 기술로 새로운 수사의 방향을 제시 할 수 있을 것이다.