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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181-190 订阅

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Fine-grained business data confidentiality control in cross-organizational tracking 15

Fine-grained business data confidentiality control in cross-...

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20th acm symposium on access control models and technologies, SacmAT 2015

作者： Han, Weili Zhang, Yin Guo, Zeqing Bertino, Elisa Software School Fudan University Shanghai Key Laboratory of Data Science Shanghai201203 China Department of Computer Science Purdue University West LafayetteIN47907 United States

ISBN: (纸本)9781450335560

With the support of the Internet of Things (IoT for short) technologies, tracking systems are being widely deployed in many companies and organizations in order to provide more efficient and trustworthy delivery services. Such systems usually support easy-to-use interfaces, by which users can visualize the shipping status and progress of merchandise, according to business data which are collected directly from the merchandise through sensing technologies. However, these business data may include sensitive business information, which should be strongly protected in cross-organization scenarios. Thus, it is critical for suppliers that the disclosure of such data to unauthorized users is prevented in the context of the open environment of these tracking systems. As business data from different suppliers and organizations are usually associated together with merchandise being shipped, it is also important to support fine-grained confidentiality control. In this paper, we articulate the problem of finegrained business data confidentiality control in IoT-enabled cross-organizational tracking systems. We then propose a fine-grained confidentiality control mechanism, referred to as xCP-ABE, to address the problem in the context of open environment. The xCP-ABE mechanism is a novel framework which makes suppliers in tracking systems able to selectively authorize specific sets of users to access their sensitive business data and satisfies the confidentiality of transmission path of goods. We develop a prototype of the xCP-ABE mechanism, and then evaluate its performance. We also carry out a brief security analysis of our proposed mechanism. Our evaluation and analysis show that our framework is an effective and efficient solution to ensure the confidentiality of business data in cross-organizational tracking systems. © Copyright 2015 acm.

关键词： Internet of things

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Attribute-Based access control models and Beyond 15

Attribute-Based Access Control Models and Beyond

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proceedings of the 10th acm symposium on Information, Computer and Communications Security

作者： Ravi Sandhu University of Texas at San Antonio USA

ISBN: (纸本)9781450332453

This talk will provide a perspective on attribute-based access control (ABAC). The ongoing authorization leap from rights to attributes offers numerous compelling benefits. Decisions about user, subject, object and context attributes can be made relatively independently and with suitable decentralization appropriate for each attribute. Policies can be formulated by security architects to translate from attributes to rights. Dynamic elements can be built into these policies so the outcomes of access control decisions automatically adapt to changing local and global circumstances. On the benefits side this leap is a maturation of authorization matching the needs of emerging cyber technologies and systems. On the risks side devolving attribute management may lead to attributes of questionable provenance and value, with attendant possibility of new channels for social engineering and malware attacks. We argue that the potential benefits will lead to pervasive deployment of attribute-based access control, and more generally attribute-based security. The cyber security research community has a responsibility to develop models, theories and systems which enable safe and chaos-free deployment of ABAC. This is a current grand challenge.

关键词： authorization access control

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Challenges in Making access control Sensitive to the "Right" Contexts 15

Challenges in Making Access Control Sensitive to the "Right"...

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proceedings of the 20th acm symposium on access control models and technologies

作者： Trent Jaeger Pennsylvania State University University Park PA USA

ISBN: (纸本)9781450335560

access control is a fundamental security mechanism that both protects processes from attacks and confines compromised processes that may try to propagate an attack. Nonetheless, we still see an ever increasing number of software vulnerabilities. Researchers have long proposed that improvements in access control could prevent many vulnerabilities, many of which capture contextual information to more accurately detect obviously unsafe operations. However, developers are often hesitant to extend their access control mechanisms to use more sensitive access control policies. My experience leads me to propose that it is imperative that an access control systems be able to extract context accurately and efficiently and be capable of inferring any non-trivial policies. In this talk, I will discuss some recent research that enforces context-sensitive policies by either extracting process context, integrating code to extract context from programs, or extracting user context. We find that context-sensitive mechanisms can prevent some obviously unsafe operations from being authorized efficiently and discuss our experiences in inferring access control policies. Based on this research, we are encouraged that future research may enable context-sensitive access control policies to be produced and enforced to prevent vulnerabilities.

关键词： capabilities context-sensitive program analysis

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Redaction based RDF access control Language 14

Redaction based RDF Access Control Language

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19th acm symposium on access control models and technologies (SacmAT)

作者： Rachapalli, Jyothsna Khadilkar, Vaibhav Kantarcioglu, Murat Thuraisingham, Bhavani Univ Texas Dallas Richardson TX 75083 USA

ISBN: (纸本)9781450329392

We propose an access control language for securing RDF graphs which essentially leverages an underlying query language based redaction mechanism to provide fine grained RDF access control. The access control language presented is equipped with critical features such as policy resolution and cascading policies that are essential for fine grained RDF access control. We present the architecture of our system which primarily features a flexible, scalable and general purpose RDF access control mechanism.

关键词： access control RDF SPARQL Redaction

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access control models for Geo-Social Computing Systems 14

Access Control Models for Geo-Social Computing Systems

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19th acm symposium on access control models and technologies (SacmAT)

作者： Tarameshloo, Ebrahim Fong, Philip W. L. Univ Calgary Dept Comp Sci Calgary AB Canada

ISBN: (纸本)9781450329392

A Geo-Social Computing System (GSCS) allows users to declare their current locations, and uses these declared locations to make authorization decisions. Recent years have seen the emergence of a new generation of social computing systems that are GSCSs. This paper proposes a protection model for GSCSs. The protection system tracks the current locations of users and a knowledge base of primitive spatial relations between locations. access control policies can be formulated by the composition of primitive spatial relations. The model is extended to account for Geo-Social Network Systems (GSNSs), which track both a spatial knowledge base and a social network. A policy language for GSNSs is proposed for specifying policies that combine both social and spatial constraints.

关键词： Protection Model Geo-Social Computing Systems GeoSocial Network Systems Location-based Protection Spatial Relation Policy Language Hybrid Logic

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Anomaly Detection and Visualization in Generative RBAC models 14

Anomaly Detection and Visualization in Generative RBAC Model...

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19th acm symposium on access control models and technologies (SacmAT)

作者： Leitner, Maria Rinderle, Stefanie Univ Vienna Fac Comp Sci Vienna Austria SBA Res Vienna Austria

ISBN: (纸本)9781450329392

With the wide use of Role-based access control (RBAC), the need for monitoring, evaluation, and verification of RBAC implementations (e.g., to evaluate ex post which users acting in which roles were authorized to execute permissions) is evident. In this paper, we aim at detecting and identifying anomalies that originate from insiders such as the infringement of rights or irregular activities. To do that, we compare prescriptive (original) RBAC models (i.e. how the RBAC model is expected to work) with generative (current-state) RBAC models (i.e. the actual accesses represented by an RBAC model obtained with mining techniques). For this we present different similarity measures for RBAC models and their entities. We also provide techniques for visualizing anomalies within RBAC models based on difference graphs. This can be used for the alignment of RBAC models such as for policy updates or reconciliation. The effectiveness of the approach is evaluated based on a prototypical implementation and an experiment.

关键词： access control anomaly detection audit graph edit distance inexact graph matching RBAC similarity

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Policy models to Protect Resource Retrieval 14

Policy Models to Protect Resource Retrieval

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19th acm symposium on access control models and technologies (SacmAT)

作者： Vijayakumar, Hayawardh Ge, Xinyang Jaeger, Trent Penn State Univ Dept Comp Sci & Engn Syst & Internet Infrastruct Secur Lab University Pk PA 16802 USA

ISBN: (纸本)9781450329392

Processes need a variety of resources from their operating environment in order to run properly, but adversary may control the inputs to resource retrieval or the end resource itself, leading to a variety of vulnerabilities. Conventional access control methods are not suitable to prevent such vulnerabilities because they use one set of permissions for all system call invocations. In this paper, we define a novel policy model for describing when resource retrievals are unsafe, so they can be blocked. This model highlights two contributions: (1) the explicit definition of adversary models as adversarial roles, which list the permissions that dictate whether one subject is an adversary of another, and (2) the application of data-flow to determine the adversary control of the names used to retrieve resources. An evaluation using multiple adversary models shows that data-flow is necessary to authorize resource retrieval in over 90% of system calls. By making adversary models and the adversary accessibility of all aspects of resource retrieval explicit, we can block resource access attacks system-wide.

关键词： Resource access Attacks Protection

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An access control Concept for Novel Automotive HMI Systems 14

An Access Control Concept for Novel Automotive HMI Systems

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19th acm symposium on access control models and technologies (SacmAT)

作者： Gansel, Simon Schnitzer, Stephan Gilbeau-Hammoud, Ahmad Friesen, Viktor Duerr, Frank Rothermel, Kurt Maihoefer, Christian Daimler AG Syst Architecture & Platforms Dept Mercedes Benz Cars Div Sindelfingen Germany Univ Stuttgart Inst Parallel & Distributed Syst Stuttgart Germany

ISBN: (纸本)9781450329392

The relevance of graphical functions in vehicular applications has increased significantly during the few last years. Modern cars are equipped with multiple displays used by different applications such as speedometer or navigation system. However, so far applications are restricted to using dedicated displays. In order to increase flexibility, the requirement of sharing displays between applications has emerged. Sharing displays leads to safety and security concerns since safety-critical applications as the dashboard warning lights share the same displays with uncritical or untrusted applications like the navigation system or third-party applications. To guarantee the safe and secure sharing of displays, we present a formal model for defining and controlling the access to display areas in this paper. We prove the validity of this model, and present a proof-of-concept

关键词： access control State-based Model Automotive Windows

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Path Conditions and Principal Matching: A New Approach to access control 14

Path Conditions and Principal Matching: A New Approach to Ac...

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19th acm symposium on access control models and technologies (SacmAT)

作者： Crampton, Jason Sellwood, James Royal Holloway Univ London Egham Surrey England

ISBN: (纸本)9781450329392

Traditional authorization policies are user-centric, in the sense that authorization is defined, ultimately, in terms of user identities. We believe that this user-centric approach is inappropriate for many applications, and that what should determine authorization is the relationships that exist between entities in the system. While recent research has considered the possibility of specifying authorization policies based on the relationships that exist between peers in social networks, we are not aware of the application of these ideas to general computing systems. We develop a formal access control model that makes use of ideas from relationship-based access control and a two-stage method for evaluating policies. Our policies are defined using path conditions, which are similar to regular expressions. We define semantics for path conditions, which we use to develop a rigorous method for evaluating policies. We describe the algorithm required to evaluate policies and establish its complexity. Finally, we illustrate the advantages of our model using an example and describe a preliminary implementation of our algorithm.

关键词： access control path condition relationship principal matching authorization

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An Actor-Based, Application-Aware access control Evaluation Framework 14

An Actor-Based, Application-Aware Access Control Evaluation ...

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19th acm symposium on access control models and technologies (SacmAT)

作者： Garrison, William C., III Lee, Adam J. Hinrichs, Timothy L. Univ Pittsburgh Dept Comp Sci Pittsburgh PA 15260 USA VMware Inc Palo Alto CA USA

ISBN: (纸本)9781450329392

To date, most work regarding the formal analysis of access control schemes has focused on quantifying and comparing the expressive power of a set of schemes. Although expressive power is important, it is a property that exists in an absolute sense, detached from the application context within which an access control scheme will ultimately be deployed. By contrast, we formalize the access control suitability analysis problem, which seeks to evaluate the degree to which a set of candidate access control schemes can meet the needs of an application-specific workload. This process involves both reductions to assess whether a scheme is capable of implementing a workload (qualitative analysis), as well as cost analysis using ordered measures to quantify the overheads of using each candidate scheme to service the workload (quantitative analysis). We formalize the two-facet suitability analysis problem, which formally describes this task. We then develop a mathematical framework for this type of analysis, and evaluate this framework both formally, by quantifying its efficiency and accuracy properties, and practically, by exploring an academic program committee workload.

关键词： access control Suitability analysis Actor-based simulation

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