• Journal of Digital Convergence
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• v.11 no.9
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• pp.189-194
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• 2013

Semantic Web is what supports a search, data integration, and automated web service by developing technology of giving help so that a computer can understand information a little more on the web. As amount of information gets growing and diverse, there is a problem of offering by efficiently extracting and processing only information proper for users' demand. Semantic Web isn't what is distinguished completely from the existing web. It gives a meaning, which was well defined, to information of being inserted on web by expanding the current web. Through this, a computer and a person come to perform work cooperatively. To implement Semantic Web, the limit of HTML needs to be overcome. The existing access authorization has not taken information and semantics into account due to the limitations of HTML. It is difficult to expand or integrate many relevant documents by using HTML. Program or software agent, not a person, cannot extract a meaning of document automatically. This study suggests a method of Access Authorization Policy Management that is in the Semantic Web configuration. Accordingly, the policy, which was designed in this study, improved the authorization process more than the existing method.

• Journal of Scientific & Technological Knowledge Infrastructure
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• s.8
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• pp.78-84
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• 2002

그리드 환경에서 사용자는 각 시스템을 사용하는데 있어서 하나의 사이트에 한번 로그인을 한 후에 다른 그리드 상의 지원에 접근할 때 추가적인 인증 과정을 거치지 않는다는 단일 인증(Single Sign on)과 같은 인증서비스, 실제로 그 사용자가 해당 시스템을 사용할 수 있는지에 대한 권한에 관련된 접근제어(Access Control) 서비스 등과 같은 보안문제에 대한 기반이 뒷받침되어야 효과적이고 안전하게 수행될 수 있을 것이다.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10a
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• pp.421-423
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• 1998

본 논문에서는 인트라넷환경에서 허가된 사용자만이 개체에 접근할 수 있도록 하기 위하여 역할기반 접근제어 정책을 이용하였다. 이러한 방법은 사용자와 데이터 사이의 권한부여의 복잡성을 감소시킨다. 또한 역할을 지역역할 및 전역역할로 구성하고 접근제어 연산 및 역할의 갱신에 따른 절차를 구현하였다. 구현을 위하여 분산객체 컴퓨팅 환경의 객체 요청중개자 CORBA/ORB를 이용하였다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.32 no.3
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• pp.513-525
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• 2022

The immutability of blockchain is core elements of security of blockchain and guarantee data integrity. However, the characteristic that the data recoreded once in the blockchain cannot be modified has place for abuse by a specific user. In fact improper contents that is inappropriate to be recorded on the blockchain, such as harmful data and user personal data, is exposed on Bitcoin. As a way to manage improper content existing in the blockchain, there is a redactable blockchain using chameleon hash proposed for the first time by Ateniese. The redactable blockchain meet the right to be forgotten of GDPR by allowing data modification and deletion. Recently, Research on personal data management is being conducted in a redactable blockchain. Research by Jia et al. proposed a model that enables users to manage their personal data in the redactable blockchain. However, semi trusted regulators, which are blockchain participation nodes, have powerful authority in the blockchain, such as modification rights and deprivation of transaction rights for all blocks, which may cause side effects. In this paper, to weaken the authority of regulators in Y. Jia et al., we propose a method of authority subject altering and authority sharing, and propose a redactable blockchain-based authority change and access control system model based on applicable scenarios.

• The KIPS Transactions:PartC
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• v.14C no.6
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• pp.537-544
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• 2007

A home network is a residential local area network in which digital home appliances are connected with each other. Applying the mobile agent technology to the home network is expected to provide a new computing model. In particular, mobility and asynchronous ability of mobile agent can be used to reduce network traffic generated for managing home appliances. However, in order to apply the mobile agent concept to the home network, access control for mobile agents is necessary. In the existing home network system, there is one special server, sometimes called home server This server generally has mapping tables to be updated periodically, which describes access control lists between users' authorities and corresponding devices. In this paper, we propose a role-based access control framework with mobile agents in home networks. This framework, called Secure KAgent framework, is designed and implemented based on KAgent system. It has two main characteristics: to control access permissions based on Role-Based Access Control(RBAC) scheme and to safety assign roles to mobile agents by role tickets.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.874-876
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• 2002

의무분리 정책의 목적은 정보의 무결성을 필요로 하는 연산들을 여러 역할이나 사용자에게 분산시킴으로써 조직 내에서 관리하는 정보의 무결성 침해 가능성을 최소화하는 것이며, 이는 기업 환경에서 중요한 보안 요구사항이다. 역할기반 접근제어는 응용에 따라 보호 객체들에 대한 역할들로 분류하여 단순한 권한 관리를 제공하며 ,의무분리 정책을 시행하기에 적합하여 기존의 강제적 접근제어나 임의적 접근제어에 대한 대안으로 의무분리와 관련하여 다양한 기법들이 제시되었다. 그러나 역할 수준의 의무분리는 역할에 할당된 과업들을 상호 배타적인 작업의 수행에 관련되지 않은 과업도 모두 배제시키게 되어 과업 실행의 유연성이 떨어지게 되므로 상호 배타적인 작인을 수행하는 과업들에 할당된 최소의 권한을 배제시키는 것이 합리적이다. 본 논문은 기업 환경에 적합한 과업-역할기반 접근제어 모델을 기초로 하여 과업의 특성에 따라 분류된 유형별로 과업 수준의 동적 의무분리를 적용하는 기법을 제시한다. 특히 실제 사용자가 병렬적으로 수행하는 워크플로우와 다중 세션 환경에서 상호 배타적인 과업들과 과업 인스턴스들에도 적용이 가능만 세션기반의 동적 의무분리 기법을 제시한다 이때 기존의 동일 사용자에 의한 동적 의무분리 적용을 공모가 가능한 사용자들에 의해 생성된 다중 세션들간의 동적 의무분리를 제시함으로써 의무분리의 목적을 만족시킨다.

• The Journal of Information Technology
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• v.4 no.4
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• pp.15-24
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• 2001

In current role-based systems, security officers handle assignments of users to roles. This may increase management efforts in a distributed environment because of the continuous involvement from security officers. The role-based delegation provides a means for implementing RBAC in a distributed environment. The basic idea of a role-based delegation is that users themselves may delegate role authorities to other users to carry out some functions on behalf of the former. This paper presents a user-level delegation model, which is based on Extended Role-Based Access Control(ERBAC). ERBAC provides finer grained access control on the base of subject and object level than RBAC model.

• The Journal of the Korea Contents Association
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• v.9 no.1
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• pp.53-60
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• 2009

In home network environments, the user authentication and authorization associated user's information and usability may be important security issue. The OSGi service platform, a well-known home network gateway already specifies the mechanism of that. The traditional authority method provided OSGi implements simple RBAC(Role Based Access Control) model. This is difficult to support efficient access control. In this paper, we propose the dynamic RBAC model based on OSGi. The proposed method describes the extended framework that manage two roles named as absolute role and relative role, extend existed framework with relative role and propose programming model to enable dynamic access control. Finally, we implement the proposed framework using AspectJ and Java annotation.

• Journal of the Korea Society of Computer and Information
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• v.27 no.9
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• pp.131-138
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• 2022

In this paper, we propose an FA-RBAC (FA-RBAC) model based on flexible properties. This model is assigned attribute-role-centric, making it easy to manage objects, as efficient as access control, and as the network environment changes, it can provide flexible access control. In addition, fine-grained permissions and simple access control can be achieved while balancing the advantages and disadvantages of the RBAC and ABAC models, reducing the number of access control rules by combining static attribute-based roles and dynamic attribute-based rules, and verifying the validity and performance benefits of the proposed model through comparison analysis and simulation.

• KIPS Transactions on Computer and Communication Systems
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• v.6 no.5
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• pp.247-254
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• 2017

In a Linux system, a user with malicious intent can acquire administrator privileges through attack types that execute shells, and can leak important user information and install backdoor program. In order to solve this problem, the existing method is to analyze the causes of the elevation of privilege, fix the problems, and then patch the system. Recently, a method of detecting an illegal elevated tasks in which information inconsistency occurs through user credentials in real time has been studied. However, since this credential method uses uid and gid, illegal elevated tasks having the root credentials may not be detected. In this paper, we propose a security module that stores shell commands and paths executed with regular privileges in a table and compares them with every file accesses (open, close, read, write) that are executed to solve the case which cannot detect illegal elevated tasks have same credential.