Centralized Role-Based Access Control for Federated Multi-Domain Environments

The secure interaction among multiple security domains is a major concern. In this paper, we highlight the issues of secure interoperability among multiple security domains operating under the widely accepted Role Based Access Control （RBAC） model. We propose a model called CRBAC that easily establishes a global policy for roles mapping among multiple security domains. Our model is based on an extension of the RBAC model. Also, multiple security domains were composed to one abstract security domain. Also roles in the multiple domains are translated to permissions of roles in the abstract security domain. These permissions keep theirs hierarchies. The roles in the abstract security domain implement roles mapping among the multiple security domains. Then, authorized users of any security domain can transparently access resources in the multiple domains.

A General Attribute and Rule Based Role-Based Access Control Model

Growing numbers of users and many access control policies which involve many different resource attributes in service-oriented environments bring various problems in protecting resource.This paper analyzes the relationships of resource attributes to user attributes in all policies, and propose a general attribute and rule based role-based access control(GAR-RBAC) model to meet the security needs. The model can dynamically assign users to roles via rules to meet the need of growing numbers of users. These rules use different attribute expression and permission as a part of authorization constraints, and are defined by analyzing relations of resource attributes to user attributes in many access policies that are defined by the enterprise. The model is a general access control model, and can support many access control policies, and also can be used to wider application for service. The paper also describes how to use the GAR-RBAC model in Web service environments.

A Cache Considering Role-Based Access Control and Trust in Privilege Management Infrastructure

PMI （privilege management infrastructure） is used to perform access control to resource in an E-commerce or E-government system. With the ever-increasing need for secure transaction, the need for systems that offer a wide variety of QoS （quality-of-service） features is also growing. In order to improve the QoS of PMI system, a cache based on RBAC （Role-based Access control） and trust is proposed. Our system is realized based on Web service. How to design the cache based on RBAC and trust in the access control model is deseribed in detail. The algorithm to query role permission in cache and to add records in cache is dealt with. The policy to update cache is introduced also.

The Research of Role Tree-Based Access Control Model

Towards the crossing and coupling permissions in tasks existed widely in many fields and considering the design of role view must rely on the activities of the tasks process,based on Role Based Accessing Control (RBAC) model,this paper put forward a Role Tree-Based Access Control (RTBAC) model. In addition,the model definition and its constraint formal description is also discussed in this paper. RTBAC model is able to realize the dynamic organizing,self-determination and convenience of the design of role view,and guarantee the least role permission when task separating in the mean time.

基于RBAC模型的前后端分离系统设计与实现

权限管理是现代信息管理系统核心功能之一,能够让用户可以安全访问系统数据,其中基于角色的访问控制模型是常用的一种权限管理模型,其优点是能够灵活地处理角色与权限之间的变化问题,为复杂的权限管理问题提供便利性。另一方面前后端分离技术能够很好地解决前端页面开发和后端服务器功能开发解耦的问题,让分工双方更加注重各自面对的业务问题,减少对开发人员技术门槛的要求,从而大大提高了开发效率。因此采用前后端分离技术实现通用的基于角色的访问控制系统具有一定的实用价值。

Design and Implementation of File Access and Control System Based on Dynamic Web

A dynamic Web application, which can help the departments of enterprise to collaborate with each other conveniently, is proposed. Several popular design solutions are introduced at first. Then, dynamic Web system is chosen for developing the file access and control system. Finally, the paper gives the detailed process of the design and implementation of the system, which includes some key problems such as solutions of document management and system security. Additionally, the limitations of the system as well as the suggestions of further improvement are also explained.

General Attribute Based RBAC Model for Web Services

Growing numbers of users and many access policies that involve many different resource attributes in service-oriented environments cause various problems in protecting resource. This paper analyzes the relationships of resource attributes to user attributes based on access policies for Web services, and proposes a general attribute based role-based access control（GARBAC） model. The model introduces the notions of single attribute expression, composite attribute expression, and composition permission, defines a set of elements and relations among its elements and makes a set of rules, assigns roles to user by inputing user＇s attributes values. The model is a general access control model, can support more granularity resource information and rich access control policies, also can be used to wider application for services. The paper also describes how to use the GARBAC model in Web services environments.

基于RBAC模型的网络安全访问控制系统

为缩短网络安全访问控制系统的响应时间,设计了一种基于角色的访问控制(Role-BasedAccess Control,RBAC)模型的网络安全访问控制系统。通过网关设备采用树莓派,外网设备采用路由器完成系统硬件设计。通过设计RBAC模型的知识库、基于RBAC模型的身份认证功能、用户信任值评估功能完成系统软件设计。仿真实验结果表明,当并发用户数量为10 000时,本文设计的网络安全访问控制系统的平均响应时间为1.38 s,工作效率较好,具有一定的应用价值。

基于RBAC的IPv6环境网络信息安全访问控制方法

常规的互联网协议第6版(Internet Protocol version 6,IPv6)环境网络信息安全访问控制方法主要使用ReliefF算法获取最优特征集合,易受访问约束限制影响,导致安全访问控制延时过高。针对此问题,利用基于角色的控制访问(Role-Based Access Control,RBAC)方法设计一种全新的IPv6环境网络信息安全访问控制方法。构建了IPv6环境网络信息安全访问控制模型,利用RBAC生成了网络信息安全访问控制关系,实现了网络信息安全访问控制。实验结果表明,所设计的基于RBAC的IPv6环境网络信息安全访问控制方法的访问控制延时相对较低,证明设计的环境网络信息安全访问的控制效果较好,具有可靠性,有一定的应用价值,为降低IPv6环境网络风险做出了一定的贡献。

RBAC模型研究、改进与实现

针对传统RBAC模型的角色管理过于复杂,权限粒度不够细化等不足,提出了一种改进模型,并详细描述了该改进模型的特点,引入了限制元素和特有权限等新概念。通过将功能模块及其相关操作映射为权限数据,使得权限代码和业务逻辑代码完全解耦。最后结合实例,详细阐述了该改进模型应用于权限管理系统的实现过程,以及该模型的优缺点。

改进的RBAC模型在信息服务平台上的应用

针对RBAC模型的不足,在研究传统的RBAC基本原理基础上,结合信息服务平台权限众多、用户和角色数目庞大的特点,提出一种改进的RBAC模型。该模型引入了组织结构、用户组的概念,扩展了资源的类型和资源权限授权形式,给出了模型的形式化定义,并将其运用在信息服务平台上。平台已成功与某高校科研管理系统进行了整合,实践表明,改进的RBAC模型不仅简化了权限管理、减少了角色数量,并且提高了系统的安全性和权限管理的灵活性。

分布式环境下基于RBAC互操作的安全检测

针对分布式系统之间进行安全互操作的问题提出了安全冲突的检测方法.通过在基于角色的访问控制(RBAC)系统之间建立角色映射来实现跨系统的访问控制.分析了由于引入角色映射带来的安全冲突,并采用形式化的方法定义了RBAC系统之间的互操作及其安全性.根据分布式环境的特点提出了互操作中安全冲突的最小化检测法,通过减少参与计算的角色数量减小了计算复杂度.在最小化检测法的基础上进一步分析了安全冲突的特点,帮助管理人员消除安全冲突.

一种基于改进RBAC模型的EIS权限管理框架的研究与实现

对基于角色的访问控制(RBAC)模型进行了延伸和拓展,提出了一种细粒度权限控制的改进模型FG-RBAC,并在此模型基础上设计开发了一套能为企业信息系统(EIS)开发者和用户提供更简单、更实用、更快速的数据级权限管理解决方案的管理框架。该框架已在若干个国有大型企业集团EIS的权限管理中获得成功应用。

基于RBAC策略的可信网格访问控制模型

针对网格环境的特点,分析了网格中实体间的信任关系,给出了信任度的计算方法。对RBAC技术进行了相应的改进,提出了基于RBAC的可信网格访问控制模型,给出了RTGM模型中的结构和模块以及访问控制部分的过程。可信网格访问控制提高了网格环境下的访问安全性。

可扩展系统中基于RBAC模型的访问控制

可扩展信息系统的建设可运用领域工程需求方法,将领域对象从系统中分离出来形成领域对象向导,系统管理员可根据向导完成领域对象的建立,从而实现系统的动态可扩展功能,而扩展的系统应能实现对用户的安全访问控制。通过分析基于角色的访问控制(RBAC)模型,在Struts,Spring和Hibernate集成框架下,给出一种全方位可扩展的动态自定制信息系统中基于RBAC模型的访问控制模块的实现方法,论述模块的后台数据库设计和模块实现等关键技术。

基于属性和RBAC的混合扩展访问控制模型

针对单纯的RBAC模型在动态授权、细粒度授权等方面存在的不足,将属性与RBAC相结合,并保持RBAC以角色为中心的核心思想,提出了两者结合的混合扩展访问控制模型HARBAC。模型支持基于属性的用户—角色分配、角色—权限分配、角色激活、会话角色权限缩减和权限继承等动态访问控制功能。对模型的元素、关系、约束和规则等进行了形式化描述。通过引入权限过滤策略对会话角色的有效权限进行进一步控制,分析研究了基于属性的会话权限缩减方法。应用实例表明HARBAC模型可有效实现动态授权和细粒度授权。HARBAC模型可与传统RBAC无缝集成,并在遵循其最小特权和职责分离等安全原则的基础上,有效降低管理复杂度,支持灵活、动态、可扩展的细粒度访问控制。

基于RBAC的云计算访问控制模型

由于受到虚拟化和弹性化特性的影响,与传统的访问控制相比,云计算下访问控制的约束条件更加复杂,主客体属性及主体所拥有的角色也因而处于动态变化之中。针对云计算下访问控制的上述问题,提出一种基于基于角色的访问控制(RBAC)的云计算访问控制模型。该模型将动态可变机制与主客体安全等级引入到访问控制策略中,既可保证云环境下数据的安全性和可靠性,又具有一定的灵活性。最后给出该模型的实现过程,并在基于云计算的医疗保健系统中予以实现。

基于RBAC的具有时空约束的工作流授权模型

结合具体工作流系统实例,提出一个基于RBAC的具有时空约束的工作流授权模型TSCWAM.与传统的访问控制授权模型不同,该模型提出了时空权限的概念,表示基于RBAC的工作流授权不仅受时间约束,还受空间范围限制,即被授权者只能在某个时间段和空间范围内才能对某个任务执行某种操作,从而既可以保证组成工作流的任务只能被属于某个特定角色的用户执行,又可以保证在授权流与工作流同步的基础上,实现授权流与空间范围动态变化的相互协调.

RBAC模型中用户代理机制的研究

针对ASP服务平台用户和服务之间权限分配日趋复杂的问题,提出了一种新的角色访问控制(A_RBAC)模型,利用代理层将平台服务与企业级用户关联,采用分级授权的用户角色访问控制运行机制,实现了用户代理机制下权限访问的区域自治性,并应用轻量级目录访问协议(LDAP)和J2EE技术将其设计实现于合肥市中小企业信息化托管平台。实践证明,该模型有效地降低了权限分配的复杂性。