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检索条件"任意字段=Proceedings of Eighth ACM Symposium on Access Control Models and Technologies"

共 458 条记录，以下是321-330 订阅

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Fast Exact and Heuristic Methods for Role Minimization Problems 08

Fast Exact and Heuristic Methods for Role Minimization Probl...

引用

13th acm symposium on access control models and technologies

作者： Ene, Alina Rao, Prasad Horne, William Schreiber, Robert Milosavljevic, Nikola Tarjan, Robert E. Princeton Univ Dept Comp Sci Princeton NJ 08540 USA

ISBN: (纸本)9781605581293

We describe several new bottom-up approaches to problems in role engineering for Role-Based access control (RBAC). The salient problems are all NP-complete, even to approximate, yet we find that in instances that arise in practice these problems can be solved in minutes. We first consider role minimization, the process of finding a smallest collection of roles that can be used to implement a pre-existing user-to-permission relation. We introduce fast graph reductions that allow recovery of the solution from the solution to a problem on a smaller input graph. For Our test cases, these reductions either solve the problem, or reduce the problem enough that we find the optimum solution with a (worst-case) exponential method. We introduce lower bounds that are sharp for seven of nine test cases and are within 3.4% oil the other two. We introduce and test a new polynormial-time approximation that on average yields 2% more roles than the optimum. We next consider the related problem of minimizing the number of connections between roles and users or permissions, and we develop effective heuristic methods for this problem as well. Finally, we propose methods for several related problems.

关键词： Role mining role-based access control

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RCWLBAC - representing role based access control in OWL

RCWLBAC - representing role based access control in OWL

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13th acm symposium on access control models and technologies, SacmAT'08

作者： Finin, T. Joshi, A. Kagal, L. Niu, J. Sandhu, R. Winsborough, W. Thuraisingham, B. Univ. of Maryland Baltimore United States Massachusetts Institute of Technology Univ. of Texas San Antonio United States Univ. of Texas Dallas

ISBN: (纸本)9781605581293

There have been two parallel themes in access control re-search in recent years. On the one hand there are efforts to develop new access control models to meet the policy needs of real world application domains. In parallel, and almost separately, researchers have developed policy languages for access control. This paper is motivated by the consideration that these two parallel efforts need to develop synergy. A policy language in the abstract without ties to a model gives the designer little guidance. Conversely a model may not have the machinery to express all the policy details of a given system or may deliberately leave important aspects unspecified. Our vision for the future is a world where advanced access control concepts are embodied in models that are supported by policy languages in a natural intuitive manner, while allowing for details beyond the models to be further specified in the policy language. This paper studies the relationship between the Web Ontology Language (OWL) and the Role Based access control (RBAC) model. Although OWL is a web ontology language and not specifically designed for expressing authorization policies, it has been used successfully for this purpose in previous work. OWL is a leading specification language for the Semantic Web, making it a natural vehicle for providing access control in that context. In this paper we show two different ways to support the NIST Standard RBAC model in OWL and then discuss how the OWL constructions can be extended to model attribute-based RBAC or more generally attribute-based access control. We further examine and assess OWL's suitability for two other access control problems: supporting attribute based access control and performing security analysis in a trust-management framework. Copyright 2008 acm.

关键词： Ontology

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Advanced Security for Virtual Organizations: The Pros and Cons of Centralized vs Decentralized Security models 08

Advanced Security for Virtual Organizations: The Pros and Co...

引用

8th IEEE International symposium on Cluster Computing and the Grid

作者： Sinnott, R. O. Chadwick, D. W. Doherty, T. Martin, D. Stell, A. Stewart, G. Su, L. Watt, J. Univ Glasgow Natl eSci Ctr Glasgow G12 8QQ Lanark Scotland Univ Kent Informat Syst Secur Grp Canterbury CT2 7NZ Kent England

ISBN: (纸本)9781424442379

Grids allow for collaborative e-Research to be undertaken, often across institutional and national boundaries. Typically this is through the establishment of virtual organizations (VOs) where policies on access and usage of resources across partner sites are defined and subsequently enforced For many VOs, these agreements have been lightweight and erred on the side of flexibility with minimal constraints on the kinds of jobs a user is allowed to run or the amount of resources that can be consumed. For many new domains such as e-Health, such flexibility is simply not tenable. Instead, precise definitions of what jobs can be run, and what data can be accessed by who need to be defined and enforced by sites. The role based access control model (RBAC) provides a well researched paradigm for controlling access to large scale dynamic VOs. However, the standard RBAC model assumes a single domain with centralised role management. When RBAC is applied to VOs, it does not specify how or where roles should be defined or made known to the distributed resource sites (who are always deemed to be autonomous to make access control decisions). Two main possibilities exist based on either a centralized or decentralized approach to VO role management. We present the advantages and disadvantages of the centralized and decentralized role models and describe how we have implemented them in a range of security focused e-Research domains at the National e-Science Centre (NeSC) at the University of Glasgow.

关键词： Information security National security Public key Grid computing Collaboration access control Large-scale systems High performance computing Certification Authorization

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SacmAT'07: proceedings of the 12th acm symposium on access control models and technologies

SACMAT'07: Proceedings of the 12th ACM Symposium on Access C...

引用

SacmAT'07: 12th acm symposium on access control models and technologies

ISBN: (纸本)1595937455

The proceedings contain 28 papers. The topics discussed include: An approach to evaluate policy similarity;a posteriori compliance control;enforcing access control over data streams;fine-grained access control to web databases;privacy-aware role based access control;a privacy preserving assertion based policy language for federation systems;distributed access control: a privacy-conscious approach;towards a VMM-based usage control framework for OS kernel integrity protection;managing the risk of covert information flows in virtual machine systems;a logical specification and analysis for SELinux MLS policy;Mesh: secure, lightweight grid middleware using existing SSH infrastructure;multilevel filesystems in solaris trusted extensions;a formal approach for testing security rules;new constructions for provably-secure time-bound hierarchical key assignment schemes;and role engineering using graph optimization.

关键词： access control

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ROWLBAC: representing role based access control in OWL 08

ROWLBAC: representing role based access control in OWL

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proceedings of the 13th acm symposium on access control models and technologies

作者： T. Finin A. Joshi L. Kagal J. Niu R. Sandhu W. Winsborough B. Thuraisingham Univ. of Maryland Massachusetts Institute of Technology Univ. of Texas at San Antonio Univ. of Texas Dallas

ISBN: (纸本)9781605581293

There have been two parallel themes in access control research in recent years. On the one hand there are efforts to develop new access control models to meet the policy needs of real world application domains. In parallel, and almost separately, researchers have developed policy languages for access control. This paper is motivated by the consideration that these two parallel efforts need to develop synergy. A policy language in the abstract without ties to a model gives the designer little guidance. Conversely a model may not have the machinery to express all the policy details of a given system or may deliberately leave important aspects unspecified. Our vision for the future is a world where advanced access control concepts are embodied in models that are supported by policy languages in a natural intuitive manner, while allowing for details beyond the models to be further specified in the policy *** paper studies the relationship between the Web Ontology Language (OWL) and the Role Based access control (RBAC) model. Although OWL is a web ontology language and not specifically designed for expressing authorization policies, it has been used successfully for this purpose in previous work. OWL is a leading specification language for the Semantic Web, making it a natural vehicle for providing access control in that context. In this paper we show two different ways to support the NIST Standard RBAC model in OWL and then discuss how the OWL constructions can be extended to model attribute-based RBAC or more generally attribute-based access control. We further examine and assess OWL's suitability for two other access control problems: supporting attribute based access control and performing security analysis in a trust-management framework.

关键词： semantic web ontology OWL access control model RBAC

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A note on the formalisation of UCON 07

A note on the formalisation of UCON

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

作者： Janicke, Helge Cau, Antonio Zedan, Hussein De Montfort Univ Software Technol Res Lab Leicester LE1 9BH Leics England

ISBN: (纸本)9781595937452

Usage control (UCON) models, similar to access control models, control and govern the users' access to resources and services that, are available in the system. One of the major improvements of UCON over traditional access control models is the continuity of the control and the concept of attribute mutability. In this paper we provide an alternative formalisation of the UCON model that relaxes many of the assumptions made in earlier formalisations of the model. We question the enforceability of UCON policies

关键词： access control formal specification security policy usage control

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Action-Status access control 07

Action-Status Access Control

引用

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

作者： Barker, Steve Kings Coll London Strand London WC2A 2LS England

ISBN: (纸本)9781595937452

We introduce a generalization of Role-based access control that we call the Action-Status access control (ASAC) model. ASAC model addresses certain shortcomings with RBAC models when applied in distributed computing contexts. The ASAC model is based on the notion of status. and a nonmonotonic theory of access control that is founded upon the notions of events, actions and times. The approach allows automatic changes to be made to policy requirements and agent authorizations that amy be based, in part, on all agent's intentional behaviors.

关键词： access control ASAC Policies

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Enforcing access control Over Data Streams 07

Enforcing Access Control Over Data Streams

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

作者： Carminati, Barbara Ferrari, Elena Tan, Kian Lee Univ Insubria DICOM Varese Italy

ISBN: (纸本)9781595937452

access control is an important component of any computational system. However, it is only recently that mechanisms to guard against unauthorized access for streaming data have been proposed. In this paper, we study how to enforce the role-based access control model proposed by us in [5]. We design a set of novel secure operators, that basically filter out tuples/attributes from results of the corresponding (non-secure) operators that are not accessible according to the specified access control policies. We further develop an access control mechanism to enforce the access control policies based oil these operators. We show that our method is secure according to the specified policies.

关键词： Data stream Security access control

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Privacy-aware Role Based access control 07

Privacy-aware Role Based Access Control

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

作者： Ni, Qun Trombetta, Alberto Bertino, Elisa Lobo, Jorge Purdue Univ W Lafayette IN 47907 USA

ISBN: (纸本)9781595937452

Privacy has been acknowledged to be a critical requirement for many business (and non-business) environments. Therefore, the definition of all expressive and easy-to-use privacy-related access control model, based oil which privacy policies call be specified, is crucial. In this work we introduce a family of models (P-RBAC) that extend the well known RBAC model in order to provide full support for expressing highly complex privacy-related policies, taking into account features like purposes and obligations. We also compare our work with access control and privacy policy frameworks such as P3P, EPAL, and XacmL.

关键词： Privacy Role Based access control Model Purpose

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Discretionary access control with the Administrative Role Graph Model 07

Discretionary Access Control with the Administrative Role Gr...

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

作者： Wang, He Osborn, Sylvia L. Univ Western Ontario Dept Comp Sci London ON N6A 5B7 Canada

ISBN: (纸本)9781595937452

Previous research examining the mapping of discretionary access control (DAC) to role-based access control (RBAC) has considered neither ownership nor further granting of privileges. We show how to accomplish this by mapping from a relational database environment to the administrative role graph model (ARGM) of Wang and Osborn. The goals of the research are to determine if the ARGM has sufficient, features to accomplish this mapping, and to study whether the grant operation in relational databases should be modeled as administration or as delegation. Our conclusion is that the ARGM can simulate both ownership and granting without requiring a delegation model.

关键词： role-based access control role graph model DAC

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