• Journal of the Korean Society for information Management
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• v.37 no.3
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• pp.1-24
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• 2020

The social media paradigm centered on videos continues to deepen due to the diversification of 5G devices, high-definition and immersive SNS. The purpose of this study is to propose various utilization strategies and measures through the analysis of the current status of YouTube channel operation and provided contents operated in public libraries. In this study, 44 libraries in Korea that have opened and operated Library YouTube Channel and 12 libraries that actively utilize library YouTube channels with more than 1,000 subscribers were surveyed for the current status of subscribers, views, video count data, and contents and delivery methods of Library YouTube Channel. Based on the analysis results, the library's YouTube channel was proposed to utilize the library's YouTube channel, 1) to secure the specificity and purpose of the library's YouTube channel, 2) to promote and enhance access to the YouTube channel, 3) to improve the YouTube channel to user-friendly interface, 5) to plan and provide library expertise and educational contents, 6) to operate the integrated YouTube channel, and 7) to provide user-based content.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.43 no.2 s.344
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• pp.22-26
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• 2006

Symmetric cryptographic algorithm is incongruent in network environment by absence of authencation in spite of advantage of easy etc. on data processing and implementation of high speed. Therefore, proposed merging style authentication algorithm that use MAC and MDC so that symmetric cryptographic algorithm can achieve authentication. Proposed algorithm made security can wide of secure communication channel as to achieve authentication to cryptographic algerian itself not that act independently of symmetric cryptographic algorithm.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.1
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• pp.81-86
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• 2016

In this paper, we present multi-channel authentication based security card design. Since this security card is written on the transparent paper, security information is extracted by overlaying the card with smartphone screen. This method removes the limitations of physical layout in previous security card and improves the security level. Furthermore, our security card is secure when our card is exposed to malicious users.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10b
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• pp.211-213
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• 1998

실시간 응용을 위한 데이터베이스 시스템은 시간 제약 조건을 만족시켜야 하며, 데이터 일관성을 유지해야 한다. 또한 다중레벨을 지원하는 보안 프로토콜은 cover channel의 생성을 방지하는 것이 중요하다. Son과 Mukkamala는 primary copy와 secondary copy를 사용한 SRT-2PL을 개발하였다. 이 프로토콜은 보안 레벨간의 불간섭(non-interference)을 지원하며, covert channel의 발생을 막을 수 있으며, 지연이 적고 취소가 적으므로 실시간 데이터베이스 시스템에서 보안을 유지하는데 사용될 수 있다. 그러나 secondary copy를 모든 데이터 오브젝트에 대해 항상 보존해야 하므로 작업공간의 낭비가 있고, 데이터의 갱신을 위해 update queue를 관리해야 하는 오버헤드와 그에 따른 예측성 결여가 문제점으로 나타난다. 따라서, 본 논문에서는 불간섭을 지원하여 covert channel의 발생을 방지하면서, 복사본의 유지 기간을 줄여 실시간 지원을 강화시키고, 예측성을 좀더 높인 개선된 SRT-2PL 실시간 데이터베이스 보안 프로토콜을 제안한다. 본 논문에서 제안하는 동적 복사 알고리즘은 트랜잭션의 동작에 따라 동적으로 복사본을 생성하여 레벨간의 불간섭을 제공함과 동시에, 복사본의 유지 기간을 줄여 작업공간의 낭비를 줄이고 예측성을 높일 수 있다.

• Journal of Communications and Networks
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• v.10 no.4
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• pp.437-443
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• 2008

The randomized projective coordinate (RPC) method applied to a pairing computation algorithm is a good solution that provides an efficient countermeasure against side channel attacks. In this study, we investigate measures for increasing the efficiency of the RPC-based countermeasures and construct a method that provides an efficient RPC-based countermeasure against side channel attacks. We then apply our method to the well-known $\eta_T$ pairing algorithm over binary fields and obtain an RPC-based countermeasure for the $\eta_T$ pairing; our method is more efficient than the RPC method applied to the original $\eta_T$ pairing algorithm.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.24 no.1
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• pp.221-227
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• 2014

When implementing cryptographic algorithms in mobile devices like smart cards, the security against side-channel attacks should be considered. Side-channel attacks try to find critical information from the side-channel infromation obtained from the underlying cryptographic devices' execution. Especially, the power analysis attack uses the power consumption profile of the devices as the side-channel information. This paper proposes a new gate-level countermeasure against the power analysis attack and the glitch attack and suggests how to apply the measure to securely implement AES.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.21 no.12
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• pp.2318-2324
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• 2017

Quantum cryptography, which is emerging as a next generation password, is being studied by quantum cryptographic transfer protocols and quantum secret communication. Quantum key transfer protocol can be used in combination with the modern password because of the inefficiency of the use of the password, or the use of OTP(one time password). In this paper an algorithm for direct communication by means of direct cryptographic communications rather than quantum keys. The method of implementing quantum secure direct community was adopted using 2-channel methods using Einstein gravity field. Two channels were designed to adopt a quantum secret communication protocol that applies time delay between 2-channels of channel to apply time difference between 2-channels. The proposed time delay effect reflects the time delay by reflecting the gravitational lensing phenomenon. Gravity generator with centrifugal acceleration is incorporated in the viscometer, and the time delay using this implies the correlation between the variance of the metametry.

• Journal of KIISE:Computer Systems and Theory
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• v.33 no.1_2
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• pp.110-118
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• 2006

Cryptographic protocol design in a two-party setting has of tel ignored the possibility of simultaneous message transmission by each of the two parties (i.e., using a duplex channel). In particular, most protocols for two-party key exchange have been designed assuming that parties alternate sending their messages (i.e., assuming a bidirectional half-duplex channel). However, by taking advantage of the communication characteristics of the network it may be possible to design protocols with improved latency. This is the focus of the present work. We present three provably-secure protocols for two-party authenticated key exchange (AKE) which require only a single round. Our first, most efficient protocol provides key independence but not forward secrecy. Our second scheme additionally provides forward secrecy but requires some additional computation. Security of these two protocols is analyzed in the random oracle model. Our final protocol provides the same strong security guarantees as our second protocol, but is proven secure in the standard model. This scheme is only slightly less efficient (from a computational perspective) than the previous ones. Our work provides the first provably- secure one-round protocols for two-party AKE which achieve forward secrecy.

• Journal of the Korean Institute of Intelligent Systems
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• v.13 no.6
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• pp.698-703
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• 2003

This paper presents analog secure communication system about safe speech transmission using chaotic signals. We applied various conditions that happen in actuality communication environment modifying chaotic synchronization and chaotic communication schemes and analyzed restoration performance of speech signal to computer simulation. In transmitter, we made the chaotic masking signal which is added voice signal to chaotic signal using PC(Pecora ＆ Carroll) and SFB(self-feedback) control techniques and transmitted encryption signal to noisy communication channel And in order to calculate the degree of restoration performance, we proposed the definition of analog average power of recovered error signals in receiver chaotic system. The simulation results show that feedback control techniques can certify that restoration performance is superior to quantitative data than PC method about masking degree, susceptibility of parameters and channel noise. We experimentally computed the table of relation of parameter fluxion to restoration error rate which is applied the encryption key values to the chaotic secure communication.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.11 no.1
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• pp.43-54
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• 2001

In this paper we study the use of polyinstantiation for spatial data, for the purpose of solving cover in topology channel in multilevel secure spatial database systems. Spatial database system with topological structure has a number of spatial analysis function using spatial data and neighbored one\`s each other. But. it has problems that information flow is occurred by topological relationship in spatial database systems. Geographic Information System(CIS) must be needed mandatory access control because there ,are many information flow through positioning information And topological relationship between spatial objects. Moreover, most GIS applications also graphe user interface(GUI). In addressing these problems, we design the MLS/SRDM(Multi Level Security/Spatial Relational Data Model) and propose polyinstantiation for spatial data for solving information flow that occurred by toplogical relationship of spatial data.