• Journal of the Korea Institute of Information Security & Cryptology
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• v.15 no.2
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• pp.23-36
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• 2005

The main obstacle hindering the wide deployment of identity-based cryptosystem is that the entity responsible for creating the private key has too much power. As a result, private keys are no longer private. One obvious solution to this problem is to apply the threshold technique. However, this increases the authentication computation, and communication cost during the key issuing phase. In this paper, we propose a new effi ient model for issuing multiple private keys in identity-based encryption schemes based on the Weil pairing that also alleviates the key escrow problem. In our system, the private key of a user is divided into two components, KGK (Key Description Key) and KUD(Key Usage Desscriptor), which are issued separately by different parties. The KGK is issued in a threshold manner by KIC (Key Issuing Center), whereas the KW is issued by a single authority called KUM (Key Usage Manager). Changing KW results in a different private key. As a result, a user can efficiently obtain a new private key by interacting with KUM. We can also adapt Gentry's time-slot based private key revocation approach to our scheme more efficiently than others. We also show the security of the system and its efficiency by analyzing the existing systems.

• Korean Journal of Health Education and Promotion
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• v.29 no.4
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• pp.39-56
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• 2012

Objectives: This paper aims to discuss the current situation of and future directions for health promotion practice(HPP) and research in private sectors in Korea. Methods: Publications and web-site information of public health organizations, WHO-Health Promoting Hospitals member institutes, health/medical academic societies, and professional unities were collected and reviewed. Activities of Korea Association of Health Promotion(KAHP) were described in detail considering its leading role in health examination and promotion field in Korea. Results: The most common HPPs in private sectors were health education and public health campaigns for the prevention and management of diseases. Tailored health promotion programs for lifestyle changes and longitudinal follow-ups were the routine process for managing high risk groups at KAHP. Health promotion research in private sectors have focused on identifying health problems and behavioral determinants, and planning, implementing and evaluating health promotion programs. The most serious issues in HPPs of the private sectors were limited budget and manpower along with a lack of public recognition and a system-level support. Conclusion: To promote HPPs and research in private sectors, a system for financial sustainability should be introduced. They also need scientific evidence from research. 'Borderline medicine', a discipline specialized in management of high risk borderline group, could lead HPPs to sustainable private practices.

• Journal of Korea Trade
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• v.23 no.4
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• pp.17-29
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• 2019

Purpose - This study examines the relationship between public-private partnerships and the performance of ports based on three factors: the quality of the port infrastructure, container throughput, and logistic performance in three Latin American countries, Mexico, Panama, and Brazil, for the period of 1994-2017. Design/methodology - The selected countries are top ranked in terms of container throughput in Latin America. The methodology employs secondary data from the World Bank (Quality of Port Infrastructure, Logistics Performance Index, and Private Participation in infrastructure database). Findings - Overall, the results revealed that the private investment of these countries varies significantly over the past couple decades. Panama, with the least public-private investment over the study period, performs better than Mexico and Brazil with regards to port quality infrastructure and container throughput. For ports in the selected countries to keep up with global competition, there is a need to enhance efficiency. Originality/value - Compared with ports in Asia, Latin American ports are lagging behind with respect to container throughput and efficiency. This study suggests greater collaboration from the private sector, academia, and other organizations, as well as a review of the regulatory framework to ensure better transparency and project allocation. Throwing more light on the public-private investment environment of Mexico, Brazil, and Panama, this study offers policy makers and regulators insightful information on port infrastructure.

• Proceedings of the Korea Contents Association Conference
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• 2007.11a
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• pp.440-444
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• 2007

This study aimed to develop an evaluation framework for public portal and private portal through user's perception survey. In order to specify the evaluation framework, this study chose yesKISTI and Google as a public portal and a private portal respectively. This study reviewed previous studies to develop indicators to evaluate of public and private portals and developed a framework to provide new services for public portals.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2004.11a
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• pp.11-11
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• 2004

• The Journal of Society for e-Business Studies
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• v.17 no.1
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• pp.137-150
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• 2012

For social demand and technological development, systematic private information management and security guidance have been enhanced; however, the issue of leakage and invasion of private information is shown in many ways. In the management of such private information, the issue of how to protect such information is one of the sensitive key elements. As a criterion to decide the management policy of each property information consisting of private information, this article suggests Dynamic-Security-Level-Measurement for property information. DSLM adopts the variable characteristics of property information as the element of measurement. By applying this method, it is possible to provide information management functions to cope with the changes of each property information security level of an individual actively. It is expected that this will improve the security of previous information management methods even more and also contribute to the improvement of security in integrated systems such as the integrated ID management system and electronic wallet.

• Convergence Security Journal
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• v.18 no.5_1
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• pp.25-32
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• 2018

Cyber hackings are increasing and becoming more intelligent. The government and private companies conduct various information protection activities by investing lots of money and employing security personnel to protect import ant assets and personal information. It is important to evaluate the efficiency of the information protection activities that cost lots of money and manpower. However, the studies on the efficiency of the information protection activities were mainly conducted for government agencies the information of which is more readily available. This study suggests a model that can evaluate the efficiency of the activities of information protection and information security certification of various private companies. Our model evaluates the efficiency of the information protection activities by applying AHP and DEA on the information that are publicly announced by the private companies. Our model identifies the DMUs that are efficiently operated and suggests the improvement policies for the DMU that are non-efficiently operated.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.24 no.1
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• pp.31-40
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• 2014

In Korea, the Public Key Infrastructure (PKI) has been introduced. For secure information transmission and identification, the electronic signature authorization system of a certificate-based is built, and then the service provide.The certificate is stored in location what users can easily access and copy. Thus, there is a risk that can be stolen by malware or web account hacking. In addition, private key passwords can be exposed by the logging tool, after keyboard security features are disabled. Each of these security weaknesses is a potential conduit for identity theft, property/asset theft, and theft of the actual certificates. The present study proposes a method to prevent the private key file access illegally. When a certificate is stored, the private key is encrypted by the dependent element of the device, and it is stored securely. If private key leakage occurs, the retrieved key could not be used on other devices.

• Journal of Cadastre & Land InformatiX
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• v.47 no.2
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• pp.135-144
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• 2017

The riverbed areas have exposed to various natural disasters and the private use by neighboring residents have caused many problems. The research objectives are to survey the actual situation of riverbed areas in order to prevent landscape damage and private use. Drone and photogrammetry, orthophoto, DSM(Digital Surface Model), digital topographic map and cadastral information have been integrated by GIS technology. The flood and disaster vulnerable area has been surveyed and the land use and private use has been analyzed using cadastral information. The research results show that the analyzed data can be used for providing foundation data for management of river and also can be used for surveying actual situation of private use on the riverbed areas.

• The Journal of Society for e-Business Studies
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• v.16 no.4
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• pp.17-31
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• 2011

Damage caused by private information breach causes serious problems and huge social losses. In order to make a better policy that prevents society from suffering from the damage, we have to know about the actual size of damage. So it is needed to develop a quantitative model of private information breach that helps catching the more accurate size of damage. In our study, we suggest a method which calculate not only the costs of damage from firms' perspective but also those from individual and social perspectives. In this process, we refer to methods adopted by JNSA(Japan Network Security Association) and Ponemon Research Institue and modify it with considering our current situation. Also we try to make a new model by using new methods(web traffic analysis, survey, indirect comparison, etc.) and verify it with theories and methods from econometrics, cost accounting and theory of producer.