• The Transactions of the Korean Institute of Electrical Engineers D
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• v.55 no.9
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• pp.423-428
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• 2006

In this paper we propose a new watermarking scheme using a data matrix and a cryptograph key. The data matrix of two-dimensional bar codes is a new technology capable of holding relatively large amounts of data compared to the conventional one-dimensional bar code. And a cryptograph key is used to prevent a watermark from malicious attacks. We encoded the copyright information into a data matrix bar code, and it was spread as a pseudo random pattern using the owner key. The experimental results show that the proposed scheme has good quality and is robust to various attacks, such as JPEG compression, filtering and resizing. Also the performance of the proposed scheme is verified by comparing the copyright information with the information which is extracted from the watermark.

• Journal of Multimedia Information System
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• v.4 no.4
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• pp.205-210
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• 2017

This paper presents a verification watermarking applied to healthcare information management. The proposed method uses the whole region based on the public-key cryptograph, which is transformed by the DWT transform to integrity verification. Furthermore, the public-key cryptograph algorithm is used for the embedded watermark image. We adaptively select the upper bit-plane including the LSB parts of each block when the watermark is inserted.

• Journal of Information Science Theory and Practice
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• v.10 no.spc
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• pp.123-134
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• 2022

Existing network cryptography systems are threatened by recent developments in quantum computing. For example, the Shor algorithm, which can be run on a quantum computer, is capable of overriding public key-based network cryptography systems in a short time. Therefore, research on new cryptography systems is actively being conducted. The most powerful cryptography systems are quantum key distribution (QKD) and post quantum cryptograph (PQC) systems; in this study, a network based on both QKD and PQC is proposed, along with a quantum key management system (QKMS) and a Q-controller to efficiently operate the network. The proposed quantum cryptography communication network uses QKD as its backbone, and replaces QKD with PQC at the user end to overcome the shortcomings of QKD. This paper presents the functional requirements of QKMS and Q-Controller, which can be utilized to perform efficient network resource management.

• Journal of the Institute of Electronics Engineers of Korea TE
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• v.39 no.2
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• pp.51-59
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• 2002

In this paper, we studied the voice cryptograph system designed by the SEED algorithm for the safe transmission and receipt on the voice communication. Voice band signal converts to digital signal by the CODEC and DSP that applied the improved SEED algorithm encrypt the digital signal. The CODEC convert Encryption signal into analog voice signal. This voice signal is transmitted safely because of encryption signal even if someone wiretap. Receiver can hear the source voice, because the encryption signal decrypted using the SEED algorithm. In this paper, We designed the 32 round key instead of 16 round key in the SEED algorithm so that we improve the truncated differential probability from $2^{-143.1}$ to $2^{-286.6}$. 

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2002.12a
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• pp.41-45
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• 2002

From the paper which it sees a strong random number generator it uses a fuzzy set from 16 method of the statistical test which is a cryptograph random number test it verifies. 16 statistical test of NIST extends in crptograph and engineering whole it is a scale which is important distinguishes the distinction incapable characterstic of the random numbers which are used. To try introduce a fuzzy set the possibility of having a more strong randomness in order to be, it strengthens the function of the random number generator.

• International Commerce and Information Review
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• v.5 no.2
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• pp.185-204
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• 2003

Electronic Clearance System in the Advanced Countries give sane hints Clearance System in Korea to improve. It is as follows. It is necessary to enhance the economical efficiency and rapidity on clearance system. It is important to improve the conveniency of importer and export through all day services in customs. It is necessary to control export and import goods efficiently for guarantee of security. Export entry data in export country has to linked with import entry data in import country to improve speedy, correctness, and efficiency. It is necessary to solve the security problems through the use of the latest cryptograph.

• Journal of the Korea Computer Industry Society
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• v.5 no.9
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• pp.1069-1078
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• 2004

We propose an individual authentication method based on optical visual cryptography in thata fingerprint data is processed by secret sharing method taking into account the optical visual cryptograph and a part of shared data transmitted through an open network. Whenever it is necessary, submitting his fingerprint with the other shared information can authenticate the owner of the fingerprint. The system efficiently identifies fingerprints through optical correlation, regardless of difficulties of acquisition of exact fingerprint imagein the various environments.

• Proceedings of the Korean Society of Computer Information Conference
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• 2015.07a
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• pp.87-88
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• 2015

최근 IT기술의 발전과 더불어 보안의 중요성이 부각되면서 Pin Number, Password, Pattern Recognition 등 인증 방식에 대한 연구가 진행되고 있지만 위와 같은 One-factor 인증 시스템에는 "Shoulder Attack"과 같은 사용자 레벨에서의 보안공격에 취약하다. 위와 같은 문제점을 해결하기 위하여 'Google E-mail' 등 일부 강화된 보안이 필요한 시스템에서는 추가 모듈을 이용한 Two-factor 인증 시스템을 적용하여 보안을 제공하고 있지만 사용상의 번거로움과 복잡성으로 인해 고도의 보안 기술의 적용을 받지 못하는 등 많은 제약사항이 남아있다. 본 논문에서는 위 와 같은 One-factor 시스템의 취약점을 파악하여 그에 따라 보안 인증 절차를 향상시키기 위해 암호화와 인증 방법으로 지문인식을 사용하여 Multi-level 인증 시스템을 제안한다. 본 시스템은 Send 디비이스를 구현한 아두이노를 통해 M2M 서비스를 수행하며, 암호와 지문 정보를 아두이노 디바이스에 저장하여 두 가지의 신뢰적인 정보를 바탕으로 인증하는 시스템이다. 아두이노를 이용하여 디바이스 분리를 통한 사용자 레벨에서의 보안을 강하고 지문인식을 통해 불편함과 복잡성을 간소화하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.791-793
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• 2015

본 연구는 저학년들이 암호에 대해서 어렵게 생각하지 않게끔 접근을 유도하기 위해 암호학을 토대로 한 만화 컨텐츠와, 암호 알고리즘 원리를 바탕으로 하여 친숙한 그림들을 이용해 메세지를 주고받는 대칭키놀이, 그리고 공개키 미니게임을 함으로써 저학년들에게 암호학과 보안의식의 관심과 흥미를 불러 일으키고 자연스레 학습할 수 있도록 유도하는 교육 솔루션에 대한 연구이다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.13 no.3
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• pp.129-134
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• 2003

Hierarchical ID-based Cryptography proposed by C. Gentry and A. Silverberg has the problem that the length of the ciphertext is proportional to the depth of the recipient in the hierarchy. In this paper, we propose the new methods to shorten the length of the ciphertext by using HlDS(Hierarchical ID-based Signature).