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检索条件"任意字段=13th ACM Symposium on Access Control Models and Technologies"

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AC-XML documents: Improving the performance of a web access control module 05

AC-XML documents: Improving the performance of a web access ...

引用

SacmAT 2005: Proceedings of 10th acm symposium on access control models and technologies

作者： Carminati, Barbara Ferrari, Elena University of Insubria at Como Via Valleggio 11 Como Italy

ISBN: (纸本)9781595930453

Protecting information over the web is today becoming a primary need. Although many access control models have been so far proposed to address the specific protection requirements of the web environment, no comparable amount of work has been done for finding efficient techniques for performing access control. We believe that the availability of techniques for speeding-up access control is a key issue to make an access control model widely acceptable. this is particularly crucial in an environment such as the web, characterized by thousands of users and thousands of documents. For these reasons, in this paper we propose a technique for speeding-up access control, which can be applied to credential-based access control models. We propose a data structure that keeps track of the policies that apply to the various portions of a data source, and which does not require the scanning of the policy base for performing access control. In the paper, besides giving the algorithms for building such data structure and for performing access control, we present a complexity analysis of the proposed approach, which demonstrates the benefits with respect to traditional methods. Copyright 2005 acm.

关键词： XML

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Adaptive trust negotiation and access control 05

Adaptive trust negotiation and access control

引用

SacmAT 2005: Proceedings of 10th acm symposium on access control models and technologies

作者： Ryutov, Tatyana Zhou, Li Neuman, Clifford Leithead, Travis Seamons, Kent E. Information Sciences Institute University of Southern California Marina del Rey CA 90292-6695 Internet Security Research Lab. Brigham Young University Provo UT 84602-6576

ISBN: (纸本)9781595930453

Electronic transactions regularly occur between business partners in separate security domains. Trust negotiation is an approach that provides an open authentication and access-control environment for such transactions, but it is vulnerable to malicious attacks leading to denial of service or leakage of sensitive information. this paper introduces an Adaptive Trust Negotiation and access control (ATNAC) framework to solve these problems. the framework combines two existing systems, TrustBuilder and GAA-AP1, to create a system with more flexibility and responsiveness to attack than either system currently provides. Copyright 2005 acm.

关键词： control system analysis

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A reference monitor for workflow systems with constrained task execution 05

A reference monitor for workflow systems with constrained ta...

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SacmAT 2005: Proceedings of 10th acm symposium on access control models and technologies

作者： Crampton, Jason Information Security Group Royal Holloway University of London

ISBN: (纸本)9781595930453

We describe a model, independent of any underlying access control paradigm, for specifying authorization constraints such as separation of duty and cardinality constraints in workflow systems. We present a number of results enabling us to simplify the set of authorization constraints. these results form the theoretical foundation for an algorithm that can be used to determine whether a given constrained work-flow can be satisfied: that is. does there exist an assignment of authorized users to workflow tasks that satisfies the authorization constraints? We show that this algorithm can be incorporated into a workflow reference monitor that guarantees that every workflow instance can complete. We derive the computational complexity of our algorithm and compare its performance to comparable work in the literature. Copyright 2005 acm.

关键词： control system analysis

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Context sensitive access control 05

Context sensitive access control

引用

SacmAT 2005: Proceedings of 10th acm symposium on access control models and technologies

作者： Hulsebosch, R.J. Salden, A.M. Bargh, M.S. Ebben, P.W.G. Reitsma, J. Telematica Instituut P.O. Box 589 7500 AN Enschede Netherlands

ISBN: (纸本)9781595930453

We investigate the practical feasibility of using context information for controlling access to services. Based solely on situational context, we show that users can be transparently provided anonymous access to services and that service providers can still impose various security levels. thereto, we propose context-sensitive verification methods that allow checking the user's claimed authenticity in various ways and to various degrees. More precisely, conventional information management approaches are used to compare historic contextual (service usage) data of an individual user or group. the result is a relatively strong, less intrusive and more flexible access control process that mimics our natural way of authentication and authorization in the physical world. Copyright 2005 acm.

关键词： Context sensitive grammars

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Rule support for role-based access control 05

Rule support for role-based access control

引用

SacmAT 2005: Proceedings of 10th acm symposium on access control models and technologies

作者： Kern, Axel Walhorn, Claudia Beta Systems Software AG Josef-Lammerting-Allee 14 50933 Köln Germany

ISBN: (纸本)9781595930453

the administration of users and access rights in large enterprises is a complex and challenging task. Role-based access control (RBAC) is a powerful concept for simplifying access control. In particular. Enterprise Roles spanning across different IT systems are increasingly used as a basis for company-wide security management. However, the administration of roles in large organisations can become quite cumbersome and needs to be automated. During the past years, rules have been used to support automation of user and access rights administration. We discuss different rule-based approaches and propose a new method called rule-based provisioning of roles which combines the advantages of rules and roles. Experiences made during implementation of this approach are presented in two case studies. the results are evaluated and show that role-based access control in combination with rule-based provisioning can be successfully used in practice. A high level of automation can be achieved. Copyright 2005 acm.

关键词： control system analysis

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Declaration and enforcement of fine-grained access restrictions for a service-based geospatial data infrastructure 05

Declaration and enforcement of fine-grained access restricti...

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SacmAT 2005: Proceedings of 10th acm symposium on access control models and technologies

作者： Matheus, Andreas Fakultät für Informatik Technische Universität München Boltzmannstr. 3 D-85748 Garching

ISBN: (纸本)9781595930453

this work describes the declaration and enforcement of geospatial access restrictions for the infrastructure of heterogenous and distributed geospatial information objects, as they are accessible via the service-oriented geospatial data infrastructure (GDI). Assuming a valid XML markup of the objects and their geometry using the Geographic Markup Language (GML). which is an international standard of the Open GIS Consortium, Inc. (OGC), a solution is introduced that allows the declaration and enforcement of access restrictions, encoded in GeoXacmL. GeoXacmL is a geospatial extension to the OASIS standard extensible access control Markup Language (XacmL). Due to the nature of the introduced restrictions, the declaration of access restrictions can result in different kinds of inconsistencies. this work describes a mechanism for the detection and classification of contrary permissions. this work also describes a prototype implementation and an illustrating demonstration. Copyright 2005 acm.

关键词： Data reduction

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Relevancy based access control of versioned XML documents 05

Relevancy based access control of versioned XML documents

引用

SacmAT 2005: Proceedings of 10th acm symposium on access control models and technologies

作者： Iwaihara, Mizuho Chatvichienchai, Somchai Anutariya, Chutiporn Wuwongse, Vilas Dept. Social Informatics Kyoto University Kyoto 606-8501 Japan Dept. Info.-Media Siebold University of Nagasaki Nagasaki 851-2195 Japan Computer Science Program Shinawatra University Pathumthani 12160 Thailand Computer Science and Information Management Program Asian Institute of Technology Pathumthani 12120 Thailand

ISBN: (纸本)9781595930453

Integration of version and access control of XML documents has the benefit of regulating access to rapidly growing archives of XML documents. Versioned XML documents provide us with valuable informations on dependencies between document nodes, but at the same time presenting the risk of undesirable data disclosure. In this paper we introduce the notion of relevancy-based access control, which realizes protection of versioned XML documents by various types of relevancy, such as version dependencies, schema similarities and temporal proximity. We define a new path query language XVerPath over XML document versions, which can be utilized for specifying relevancy-based access control policies. We also introduce the notion of relevancy class, for collectively and compactly specifying relevancy-based policies. Copyright 2005 acm.

关键词： XML

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Purpose based access control of complex data for privacy protection 05

Purpose based access control of complex data for privacy pro...

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SacmAT 2005: Proceedings of 10th acm symposium on access control models and technologies

作者： Byun, Ji-Won Bertino, Elisa Li, Ninghui CERIAS Department of Computer Sciences Purdue University 656 Oval Drive West Lafayette IN 47907

ISBN: (纸本)9781595930453

As privacy becomes a major concern for both consumers and enterprises, many research efforts have been devoted to the development, of privacy protecting technology. We recently proposed a privacy preserving access control model for relational databases, where purpose information associated with a given data element specifies the intended use of the data element. In this paper, we extend our previous work to handle other advanced data management systems, such as the ones based on XML and the ones based on the object-relational data model. Another contribution of our paper is that we address the problem of how to determine the purpose for which certain data are accessed by a given user. Our proposed solution relics on the well-known RBAC model as well as the notion of conditional role which is based on the notions of role attribute and system attribute. Copyright 2005 acm.

关键词： Data privacy

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A fine-grained, controllable, user-to-user delegation method in RBAC 05

A fine-grained, controllable, user-to-user delegation method...

引用

SacmAT 2005: Proceedings of 10th acm symposium on access control models and technologies

作者： Wainer, Jacques Kumar, Akhil Institute of Computing State University of Campinas Campinas Brazil Smeal College of Business Penn State University University Park PA United States

ISBN: (纸本)9781595930453

this paper addresses the issues surrounding user-to-user delegation in RBAC. We show how delegations can be incorporated into the RBAC model in a simple and straightforward manner. A special feature of the model is that it allows fine-grained control over what rights a user wishes to delegate as opposed to delegation at the role level where all the rights of a role must be delegated. In addition, the model provides a rich set of controls regarding further delegations of a right, generic constraints that further control delegations, and an innovative model for revocations. Properties of both delegation and revocation are discussed, and our work is compared with other related research. Copyright 2005 acm.

关键词： control system analysis

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Role mining with ORCA 05

Role mining with ORCA

引用

SacmAT 2005: Proceedings of 10th acm symposium on access control models and technologies

作者： Schlegelmilch, Jürgen Steffens, Ulrike OFFIS e.V. Escherweg 2 26121 Oldenburg Germany

ISBN: (纸本)9781595930453

With continuously growing numbers of applications, enterprises face the problem of efficiently managing the assignment of access permissions to their users. On the one hand, security demands a tight regime on permissions;on the other hand, users need permissions to perform their tasks. Role-based access control (RBAC) has proven to be a solution to this problem but relies on a well-defined set of role definitions, a role concept for the enterprise in question. the definition of a role concept (role engineering) is a difficult task traditionally performed via interviews and workshops. However, often users already have the permissions that they need to do their jobs, and roles can be derived from these permission assignments using data mining technology, thus giving the process of role concept definition a head-start. In this paper, we present the ORCA role mining tool and its algorithm. the algorithm performs a cluster analysis on permission assignments to build a hierarchy of permission clusters and presents the results to the user in graphical form. It allows the user to interactively add expert knowledge to guide the clustering algorithm. the tool provides valuable insights into the permission structures of an enterprise and delivers an initial role hierarchy for the definition of an enterprise role concept using a bottom-up approach. Copyright 2005 acm.

关键词： control system analysis

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