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共 458 条记录，以下是311-320 订阅

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Enabling Verification and Conformance Testing for access control Model 08

Enabling Verification and Conformance Testing for Access Con...

引用

13th acm symposium on access control models and technologies

作者： Hu, Hongxin Ahn, Gail-Joon Univ N Carolina Charlotte NC 28223 USA

ISBN: (纸本)9781605581293

Verification and testing are the important;step for software assurance. However, such crucial and yet challenging tasks have not been widely adopted in building access control systems. In this paper we propose a methodology to support automatic analysis and conformance testing for access control systems, integrating those features to Assurance Management Framework (AMF). Our methodology attempts to verify formal specifications of a role-based access control model and corresponding policies with selected security properties. Also, we systematically articulate testing cases from formal specifications and validate conformance to the system design and implementation using those cases. In addition, we demonstrate feasibility and effectiveness of our methodology rising SAT and Alloy toolset.

关键词： access control Model-based Verification Model-based Testing SAT Solver Alloy

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RBAC Administration in Distributed Systems 08

RBAC Administration in Distributed Systems

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13th acm symposium on access control models and technologies

作者： Dekker, M. A. C. Crampton, J. Etalle, S. KPMG CT The Hague Netherlands

ISBN: (纸本)9781605581293

Large and distributed access control systems are increasingly common, for example in health care. In such settings, access control policies may become very complex, thus complicating correct and efficient adminstration of the access control system. Despite being one of the most widely used access control standards, RBAC does not include all administration model for distributed systems. In this paper we fill this gap. We present a model for the administration of RBAC in a distributed system and propose all administration procedure supporting the principle that different systems protect different sets of objects. We demonstrate that our procedure fulfills the formal requirements deriving from safety and availability, and we show how it can be translated to a practical implementation. Finally, we show how our model car) be extended with multiple decentralized administrative systems.

关键词： access control Distributed System RBAC Administration

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Context-Aware Role-based access control in Pervasive Computing Systems 08

Context-Aware Role-based Access Control in Pervasive Computi...

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13th acm symposium on access control models and technologies

作者： Kulkarni, Devdatta Tripathi, Anand Univ Minnesota Dept Comp Sci St Paul MN 55455 USA

ISBN: (纸本)9781605581293

In this paper we present a context-aware RBAC (CA-RBAC) model for pervasive computing applications. The design of this model has been guided by the context-based access control requirements of such applications. These requirements are related to users' memberships in roles, permission executions by role members, and context-based dynamic integration of services in the environment with an application. Context information is used in role admission policies, in policies related to permission executions by role members, and in policies related to accessing of dynamically interfaced services by role members. The dynamic nature of context information requires model-level support for revocations of role memberships and permission activations when certain context conditions fail to hold. Based on this model we present a programming framework for building context-aware applications, providing mechanisms for specifying and enforcing context-based access control requirements.

关键词： Context-Aware Computing Pervasive Computing Context-based access control RBAC

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Authorization Recycling in RBAC Systems 08

Authorization Recycling in RBAC Systems

引用

13th acm symposium on access control models and technologies

作者： Wei, Qiang Beznosov, Konstantin Crampton, Jason Ripeanu, Matei Univ British Columbia LERSSE Vancouver BC V5Z 1M9 Canada

ISBN: (纸本)9781605581293

As distributed applications increase in size and complexity, traditional authorization mechanisms based on a single policy decision point are increasingly fragile because this decision point represents a single point of failure and a performance bottleneck. Authorization recycling is one technique that has been used to address these challenges. This paper introduces and evaluates the mechanisms for authorization recycling in RBAC enterprise systems. The algorithms that support these mechanisms allow precise and approximate authorization decisions to be made, thereby masking possible failures of the policy decision point and reducing its load. We evaluate these algorithms analytically and using a prototype implementation. Our evaluation results demonstrate that authorization recycling can improve the performance of distributed access control mechanisms.

关键词： SAAM RBAC access control authorization recycling

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access control by Action control 08

Access Control by Action Control

引用

13th acm symposium on access control models and technologies

作者： Barker, Steve Kings Coll London Dept Comp Sci London WC2A 2LS England

ISBN: (纸本)9781605581293

We address the problem of defining access control policies that may be used in the evaluation of requests made by client actors, in the course of e-trading, to perform actions on the resources maintained by an e-collective. An e-collective is a group of agents that may act individually or in conjunction with other agents to satisfy a client's request to act. Our principal contribution to this key problem is to define formally an access control model in terms of which policies may be specified for helping to ensure that only legitimate forms of client actions are performed in the course of engaging in e-trading. We call this model the action control model. In action control, the notion of intentional, empowered, authorized actions, that may be performed individualistically or jointly with other agents, and in a manner that is consistent with a group ethos, is the basis for specifying a set of permissives. A permissive is a generalization of the notion of a permission (as the latter term is usually interpreted in access control). In addition to the formal definition of the action control model, we give examples of action control policy specifications and we describe a candidate implementation and performance measures.

关键词： Action control Logic

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A General Obligation Model and Continuity-Enhanced Policy Enforcement Engine for Usage control 08

A General Obligation Model and Continuity-Enhanced Policy En...

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13th acm symposium on access control models and technologies

作者： Katt, Basel Hafner, Michael Zhang, Xinwen Breu, Ruth Seifert, Jean-Pierre Univ Innsbruck A-6020 Innsbruck Austria

ISBN: (纸本)9781605581293

The usage control model (UCON) has been proposed to augment traditional access control models by integrating authorizations, obligations, and conditions and providing the properties of decision continuity and attribute mutability. Several recent work have applied UCON to support security requirements in different computing environments such as resource sharing in collaborative computing systems and data control in remote platforms. In this paper we identify two individual but interrelated problems of the original UCON model and recent implementations: oversimplifying the concept of usage session of the model, and the lack of comprehensive ongoing enforcement mechanism of implementations. We extend the core UCON model with continuous usage sessions thus extensively augment the expressiveness of obligations in UCON, and their propose a general, continuity-enhanced and configurable usage control enforcement engine. Finally we explain how our approach call satisfy flexible security requirements with an implemented prototype for a healthcare information system.

关键词： Design Security

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Enforcing Security Properties in Task-based Systems 08

Enforcing Security Properties in Task-based Systems

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13th acm symposium on access control models and technologies

作者： Irwin, Keith Yu, Ting Winsborough, William H. N Carolina State Univ Raleigh NC 27695 USA

ISBN: (纸本)9781605581293

Though a user's privileges are often granted based on the tasks that the user is expected to fulfill, the concept of tasks is usually not explicitly modeled in access control. We propose a system where tasks are the central concept that associates users to privileges. Ideally a user should be able to utilize these privileges and fulfill his tasks, but not to take harmful actions. To ensure this, a system often specifies a high-level security property to restrict the sequence of actions that a user can perform. In this paper, we propose a general model of access control in task-based system. This model considers the permissions a user as well as their temporal availability. Based on this model, we investigate the problem of enforcing security properties both statically (i.e., when tasks are assigned) and dynamically (i.e., when actions are performed). We study the complexity of static enforcement, and design efficient dynamic enforcement algorithms that avoiding unnecessary history tracking.

关键词： Policy Task-based access control Security Properties

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Task-Based Entailment Constraints for Basic Workflow Patterns 08

Task-Based Entailment Constraints for Basic Workflow Pattern...

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13th acm symposium on access control models and technologies

作者： Wolter, Christian Schaad, Andreas Meinel, Christoph SAP Res D-76131 Karlsruhe Germany

ISBN: (纸本)9781605581293

access control decisions are based on the authorisation policies defined for a system as well as observed context and behaviour when evaluating these constraints at runtime. Workflow management systems have been recognised as a primary source for defining authorisation policies at workflow designtime, as well as generating context;at runtime. This paper analyses recent work in tire workflow community regarding established control-flow patterns. We claim that there is air intrinsic relationship between these patterns and a set of task-based entailment constraints - such as Separation of Duty - that have been recently identified by the access control community. These constraints are based on a pre-determined partial order on sequence and parallel execution patterns. When, however, such air order does riot exist, because of more complex control-flow patterns, ambiguous constraint evaluation situations will arise at workflow runtime. Accordingly, this paper reviews basic workflow patterns and identifies relationships between these and task-based entailment constraints. In addition, art analysis of possible runtime ambiguities that may arise from these relationships is presented. Our approach is based on recently developed techniques for visual constraint representation at a workflow design-time.

关键词： access control Separation of Duty Task-Based Entailment Constraints Workflow Management Workflow Modelling

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New constructions for provably-secure time-bound hierarchical key assignment schemes 07

New constructions for provably-secure time-bound hierarchica...

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12th acm symposium on access control models and technologies (SacmAT 2007)

作者： De Santis, Alfredo Ferrara, Anna Lisa Masucci, Barbara Univ Salerno Dipartimento Informat & Applicaz I-84084 Fisciano SA Italy

ISBN: (纸本)9781595937452

A time-bound hierarchical key assignment scheme is a method to assign time-dependent encryption keys to a set of classes in a partially ordered hierarchy, in such a way that each class in the hierarchy can compute the keys of all classes lower down in the hierarchy, according to temporal constraints. In this paper we propose new constructions for time-bound hierarchical key assignment schemes which are provably secure with respect to key indistinguishability. Our constructions use as a building block any provably-secure hierarchical key assignment scheme without temporal constraints and exhibit a tradeoff among the amount of private information held by each class, the amount of public data, the complexity of key derivation, and the computational assumption on which their security is based. Moreover, the proposed schemes support updates to the access hierarchy with local changes to public information and without requiring any private information to be re-distributed. (C) 2008 Elsevier B.V. All rights reserved.

关键词： access control Key assignment Provable security Efficient key derivation

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Using Policy-based Management for Privacy-Enhancing Data access and Usage control in Grid Environments 08

Using Policy-based Management for Privacy-Enhancing Data Acc...

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8th IEEE International symposium on Cluster Computing and the Grid

作者： Hommel, Wolfgang Munich Network Management Team Leibniz Supercomp Ctr D-85748 Garching Germany

ISBN: (纸本)9781424442379

Preventing the misuse of personally identifiable information and preserving user privacy are key issues in the management of IT services, especially when organizational borders are crossed. In this paper we first present an analysis of the differences between Grid environments and previous models of inter-organizational collaboration. Based on requirements derived thereof we demonstrate how existing policy-based privacy management architectures can be extended to provide Grid-specific functionality and can be integrated into existing infrastructures. Special emphasis is put on privacy policies which can be configured by users themselves, and distinguishing between the initial data access and the later data usage control phases. We also discuss the application of this approach to a XacmL-based privacy management system.

关键词： Grid

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