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检索条件"任意字段=SACMAT 2005: Proceedings of 10th ACM Symposium on Access Control Models and Technologies"

共 20 条记录，以下是11-20 订阅

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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...

引用

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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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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Verifiable composition of access control and application features 05

Verifiable composition of access control and application fea...

引用

sacmat 2005: proceedings of 10th acm symposium on access control models and technologies

作者： Song, Eunjee Reddy, Raghu France, Robert Ray, Indrakshi Georg, Geri Alexander, Roger Computer Science Dept. Colorado State University Fort Collins CO 80523

ISBN: (纸本)9781595930453

access control features are often spread across and tangled with other functionality in a design. this makes modifying and replacing these features in a design difficult. Aspect-oriented modeling (AOM) techniques can be used to support separation of access control concerns from other application design concerns. Using an AOM approach, access control features are described by aspect models and other application features are described by a primary model. Composition of aspect and primary models yields a design model in which access control features are integrated with other application features. In this paper, we present, through an example, an AOM approach that supports verifiable composition of behaviors described in access control aspect models and primary models. Given an aspect model, a primary model, and a specified property, the composition technique produces proof obligations as the behavioral descriptions in the aspect and primary models are composed. One has to discharge the proof obligations to establish that the composed model has the specified property. 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...

引用

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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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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Peer-to-peer access control architecture using trusted computing technology 05

Peer-to-peer access control architecture using trusted compu...

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sacmat 2005: proceedings of 10th acm symposium on access control models and technologies

作者： Sandhu, Ravi Zhang, Xinwen George Mason University

ISBN: (纸本)9781595930453

It has been recognized for some lime that software alone does not provide an adequate foundation for building a high-assurance trusted platform. the emergence of industry-standard trusted computing technologies promises a revolution in this respect by providing roots of trust upon which secure applications can be developed. these technologies offer a particularly attractive platform for security in peer-to-peer environments. In this paper we propose a trusted computing architecture to enforce access control policies in such applications. Our architecture is based on an abstract layer of trusted hardware which can be constructed with emerging trusted computing technologies. A trusted reference monitor (TRM) is introduced beyond the trusted hardware. By monitoring and verifying the integrity and properties of running applications in a platform using the functions of trusted computing, the TRM can enforce various policies on behalf of object owners. We further extend this platform-based architecture to support user-based control policies, cooperating with existing services for user identity and attributes. this architecture and its refinements can be extended in future work to support general access control models such as lattice-based access control, role-based access control, and usage control. Copyright 2005 acm.

关键词： control system analysis

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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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Relevancy based access control of versioned XML documents 05

Relevancy based access control of versioned XML documents

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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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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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Provable bounds for portable and flexible privacy-preserving access rights

Provable bounds for portable and flexible privacy-preserving...

引用

sacmat 2005: proceedings of 10th acm symposium on access control models and technologies

作者： Blanton, Marina Atallah, Mikhail J. Department of Computer Science Purdue University

In this work we address the problem of portable and flexible privacy-preserving access rights for large online data repositories. Privacy-preserving access control means that the service provider can neither learn what access rights a customer has nor link a request to access an item to a particular customer, thus maintaining privacy of both customer activity and customer access rights. Flexible access rights allow any customer to choose any subset of items from the repository and correspondingly be charged only for the items selected. And portability of access rights means that the rights themselves can be stored on small devices of limited storage space and computational capabilities, and therefore the rights must be enforced using the limited resources available. Our main results are solutions to the problem that utilize minimal perfect hash functions and order-preserving minimal perfect hash functions. None of them use expensive cryptography, all require very little space, and they are therefore suitable for computationally weak and space-limited devices such as smartcards. sensors, etc. Performance of the schemes is measured as the probability of false positives (i.e., the probability that access to an unpurchasecl item will be permitted) for a given storage space bound. Using our techniques, for a data repository of size n and subscription order of m « n items, we achieve a probability of false positives of m-c using only O(cm) bits of storage space, where c is an adjustable parameter (a constant or otherwise) that can be set to provide the desired performance. this is the first time that such provable bounds are established for this problem, and we believe the techniques we use are of more general interest through the unusual use we make of perfect hashing. Copyright 2005 acm.

关键词： Data privacy

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