• Journal of the Korea Institute of Information Security & Cryptology
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• v.10 no.3
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• pp.11-28
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• 2000

In these days it is rapidly increasing that multi-user, multi-layered commercial software developments for companies or public institutions. Security services are necessary for most of systems and the access control service is the essential of security services. Current access control methods that are used as access control policies are classified as Discretionary Access Control Mandatory Access Control and Role Based Access Control. However there are some inefficiencies when those methods are applied to current multi-user, multi-layered systems. Therefore it is required that a new access control method that takes complex system resources into account from the side of policy. In this paper extending previous Role Based of 'Behavior' and a basic model of the method. And we simply implement the method on the mobile agent based workflow management system that is a representative example of multi-user. multi-layered softwares and shows implementation results to tap possibilities of real-world application.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.10b
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• pp.847-850
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• 2001

본 논문에서는 최근에 많은 관심이 증가하고 있는 보안 운영체제를 위한 접근제어에 대해 기술하고 이 접근제어를 FreeBSD 에 구현한 것에 대해 설명한다. 강제적 접근제어(MAC), 신분 기반 접근제어(DAC), 그리고 역할기반 접근제어(RBAC) 과 같은 접근제어 정책들을 안전한 FreeBSD 운영체제를 위해 접근제어 정책으로 사용하였다. MAC 과 ACL 의 구현은 POSIX1003.le 의 표준에 기준 하였고 RBAC 의 구현은 NIST의 표준을 기준으로 하였다. 강제적 접근제어는 군기관이나 정부 기관의 보안 요구사항들을 만족시켜주지만 보안관리 측면에서는 유동적이지 못한 면이 있다. 반면에 역할기반 접근제어는 상업적 접근제어 정책 요구 사항들을 만족시켜주는 정책으로 유동적이고 다양한 보안 관리 정책의 요구사항들을 만족 시켜준다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.9
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• pp.1947-1954
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• 2011

There are various attacks such as tampering, bypassing and spoofing which are caused with system-wide vulnerabilities of Windows operating system. The underlying operating system is responsible for protecting application-space mechanisms against such attacks. This paper provides the implementation of mandatory access control known as multi-level security (MLS) rating with TCSEC-B1 level on th kernel of Windows$^{TM}$. By adding especially the protection feature against tampering memory of processes to the security kernel, this implementation meets the responsibility against system-wide vulnerabilities.

• Proceedings of the Korean Information Science Society Conference
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• 2001.04a
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• pp.805-807
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• 2001

안전한 컴퓨터 시스템 평가기준인 TCSEC(Trusted Computer System Evaluation Criteria)[1] B1급 이상 시스템의 안전한 운영체제들은 강제접근통제(Mandatory Access Control : MAC) 메커니즘을 이용하여 정보의 흐름을 제어하고 있다. 하지만 아무리 정확하게 설계된 접근통제 메커니즘이라고 하더라도 시스템 관리자 또는 보안 관리자가 어떻게 시스템이 접근통제 메커니즘을 관리.운영하느냐에 따라 그 시스템의 안전성과 보안에 대한 신뢰도가 결정된다고 할 수 있다. 지금까지 연구되고 있는 대부분의 MAC을 적용한 안전한 운영체제는 접근통제메커니즘의 적용 및 관리.운영상의 보안문제점을 관리할 적당한 방법을 제시하고 있지 않다[4][5][6][7]. 본 논문은 MAC을 적용한 안전한 운영체제의 안전하고 효율적인 관리.운영을 위한 방법으로 LMACM(Log Manager for Access Control Mechanism)을 제안한다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.10 no.3
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• pp.49-62
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• 2000

Role-Based Access Control(RBAC) has recently received considerable attention as a alternative to traditional discretionary and mandatory access control to apply variant organizations function hierarchy of commercial or govemment. Also RBAC provides a delegation that is one of control principles in organization. In general delegation occurring in real organization is performed by an user giving permissions to another user. But, RBAC cannot implement these user-level delegation correctly. And delegation result in security problem such as destroying separation of duty policy information disclosure due to inappro-priate delegation. Besides security adminsitrator directly deals with that problem. In this thesis we suggests some methods that is created by the user.

• 제어로봇시스템학회:학술대회논문집
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• 2003.10a
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• pp.2097-2100
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• 2003

Many studies have been done on secure operating system using secure kernel that has various access control policies for system security. Secure kernel can protect user or system data from unauthorized and/or illegal accesses by applying various access control policies like DAC(Discretionary Access Control), MAC(Mandatory Access Control), RBAC(Role Based Access Control), and so on. But, even if secure operating system is running under various access control policies, network traffic among these secure operating systems can be captured and exposed easily by network monitoring tools like packet sniffer if there is no protection policy for network traffic among secure operating systems. For this reason, protection for data within network traffic is as important as protection for data within local system. In this paper, we propose a secure operating system trusted channel, SOSTC, as a prototype of a simple secure network protocol that can protect network traffic among secure operating systems and can transfer security information of the subject. It is significant that SOSTC can be used to extend a security range of secure operating system to the network environment.

• Convergence Security Journal
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• v.2 no.2
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• pp.49-58
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• 2002

RBAC(Role Based Access Control) is an access control method based on the application concept of role instead of DAC(Discretionary Access Control) or MAC(Mandatory Access Control) based on the abstract basic concept. Model provides more flexibility and applicability on the various computer and network security fields than the limited 1functionality of kernel access control orginated from BLP model. In this paper, we propose $ERBAC_0$ (Extended $RBAC_0$ ) model by considering subject's and object's roles and the role hierarchy result from the roles additionally to $RBAC_0$ base model. The proposed $ERBAC_0$ model assigns hierarchically finer role on the base of subject and object level and provides flexible access control services than traditional $RBAC_0$ model.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.9 no.1
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• pp.47-56
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• 1999

RBAC(Role Based Access Control) is an access control method based on the user's roles and it provides more flexibility and applicability on the various computer and network security fields than DAC(Discretionary Access Control) or MAC(Mandatory Access Control). In this paper, we newly propose ERBAC$_{0}$(Extended RBAC$_{0}$) model by considering subject's and object's roles additionally to REAC$_{0}$ model which is firstly proposed by Ravi S. Sandhu as a base model. The proposed ERBAC$_{0}$ model provides finer grained access control on the base of subject and object level than RBAC$_{0}$ model.

• Proceedings of the Korea Multimedia Society Conference
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• 2002.05d
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• pp.936-940
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• 2002

역할기반 접근통제(RBAC, Role-Based Access Control)의 개념은 접근통제의 전통적인 강제적 접근통제(MAC, Mandatory Access Control) 및 임의적 접근통제(DAC, Discretionary Access Control)의 대안으로서 많은 관심을 집중시키고 있다. 그러나 역할기반 접근통제를 워크 플로우 시스템에 그대로 적용할 경우에 의무 분리가 복잡해지고, 의무분리를 통해 상호 배타적인 역할을 가지지 못하게 했을 때 서로 관계없는 워크 플로우를 동시에 처리 못하게 되는 문제점이 발생할 수 있다. 이것을 해결하기 위하여 기업 환경의 특성으로 고려한 과업 역할기반 접근제어 모델(TRBAC: Task Role Based Access Control)이 제안되었다. 본 논문에서는 TRBAC의 워크 플로우 과업 관리를 위하여 과업(Task)을 역할(Role)에 할당하는 과업 - 역할할당(TRA)모델을 제안하고 이를 구현한다.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2001.11a
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• pp.340-347
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• 2001

Security operating system applied to MAC(Mandatory Access Control) or to MLS(Multi Level Security) gives both subject and object both Security Level and value of Category, and it restrict access to object from subject. But it violates Security policy of system and could be a circulated course of illegal information. This is correctly IPC(Interprocess Communication)mechanism and Covert Channel. In this thesis, I tried to design and implementation as OS kernel in order not only to give confidence of information circulation in the Security system, but also to defend from Covert Channel by Storage and IPC mechanism used as a circulated course of illegal information. For removing a illegal information flow by IPC mechanism. I applied IPC mechanism to MLS Security policy, and I made Storage Covert Channel analyze system call Spec. and than distinguish Storage Covert Channel. By appling auditing and delaying, I dealt with making low bandwidth.