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

共 483 条记录，以下是381-390 订阅

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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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Broadband demand and the role of new technologies

Broadband demand and the role of new technologies

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NETWORKS International Telecommunications Network Strategy and Planning symposium

作者： Kjell Stordahl Telenor Norway Snarøyvn 30 Fornebu N-1331 Norway

Huge investments have been used to roll out broadband networks during the recent years. Long-term broadband demand forecasts have been and are crucial for investments decisions, rollouts and dimensioning of the networks. the main broadband access technologies have been DSL and Cable modem (Hybrid Fiber Coax). Also other technologies like fiber (FTTx) and fixed radio access are entering the market. Especially in Japan, Hong Kong and Korea, the growth of FTTx has been significant during the last years. However, the fiber access evolution in Western Europe has been quite modest. To cover the residual broadband market, technologies like WiMAX and mobile broadband are needed. the forecasting models are based on four parameters Logistic models and substitution effects between demands for different broadband technologies. For mobile broadband limited demand data, so far, are available. In addition specific attention is put on FTTx which is the long-term ultimate broadband solution. the long-term FTTx forecasts for Western Europe are dependent of a set of assumptions like time delay, regulatory aspects, degree of densely populated areas etc. the access forecasts for Western Europe show that the dominating technology, DSL, soon start to loose market share.

关键词： Optical fiber cables DSL Broadband communication Cable TV WiMAX Modems Optical fibers

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thermal analysis of 8-T SRAM for nano-scaled technologies

Thermal analysis of 8-T SRAM for nano-scaled technologies

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International symposium on Low Power Electronics and Design (ISLPED)

作者： Mesut Meterelliyoz Jaydeep P. Kulkarni Kaushik Roy School of Electrical and Computer Engineering Purdue University West Lafayette IN USA

Different sections of a cache memory may experience different temperature profiles depending on their proximity to other active logic units such as the execution unit. In this paper, we perform thermal analysis of cache memories under the influence of hot-spots. In particular, 8-T SRAM bit cell is chosen because of its robust functionality at nano-scaled technologies. thermal map of entire 8-T SRAM cache is generated using hierarchical compact thermal models while solving the leakage and temperature self consistently. the impact of spatial temperature variations on 8T-SRAM parameters such as local bitline (LBL) sensing delay, noise robustness and bitcell stability are evaluated for 45nm/32nm/22nm bulk CMOS technology nodes. the effectiveness of variable keeper sizing on LBL sensing delay is analyzed. It is predicted that at 22 nm node, the leakage induced temperature rise has severe effects on the 8-T SRAM characteristics.

关键词： Random access memory Temperature sensors Cache memory Noise robustness Robust stability CMOS technology Temperature dependence Logic Performance analysis Semiconductor device modeling

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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

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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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Fine-grained access control to Web Databases 07

Fine-grained Access Control to Web Databases

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

作者： Roichman, Alex Gudes, Ehud Open Univ Dept Comp Sci Raanana Israel

ISBN: (纸本)9781595937452

Before the Web era, databases were well-protected by using the standard access control techniques such as Views and SQL authorization commands. But with the development of web systems, the number of attacks oil databases increased and it has become clear that their access control mechanism is inadequate for web-based systems. In particular, the SQL Injection and other vulnerabilities have received considerable attention in recent years, and satisfactory solutions to these kinds of attacks are still lacking. We present a new method For protecting web databases that is based on fine-grained access control mechanism. this method uses the databases' built-in access control mechanisms enhanced with Parameterized Views and adapts them to work with web applications. the proposed access control mechanism is applicable for any existing databases and is capable to prevent many kinds of attacks, thus significantly decreases the web databases' attack Surface.

关键词： access control web database security database vulnerability parameterized view session key rolling key

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