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检索条件"任意字段=14th ACM Symposium on Access Control Models and Technologies"

共 462 条记录，以下是171-180 订阅

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Dynamic analysis of body control module 14

Dynamic analysis of body control module

引用

14th symposium on International Automotive Technology, SIAT 2015

作者： Mahajan, Nikhil V. Shriniwas, Chippa P. Abhijit, Majage S. Vishwakarma Institute of Technology India Finite Four Technologies India

Nowadays, the passenger cars are employing more and more electronic devices for controlling various mechanisms. this has increased the demand for such equipments in the passenger car. the electronic devices for controlling the mechanisms such as keyless entry, window, wiper controllers, mirror controls, engine performance monitors, security systems, lighting control are mounted on Printed Circuit board (PCB) which is enclosed inside the plastic cover assembly called Body control Module (BCM). the BCM is attached inside the dashboard assembly which is subjected to various loading conditions. In addition, space and height constraints should also be taken into consideration. In present work, dynamic analysis of existing design of BCM is carried out. It has been observed that, the existing design fails under impact loading condition. To overcome the failure, modifications in design are proposed. the modified design of BCM has been tested through both, numerical simulations and experiments. Further, modified design of BCM has been tested for vibration loading and mechanical shock condition using numerical simulation. the results show that the component is safe under these loading conditions. Copyright © 2015 SAE International and Copyright © SAEINDIA.

关键词： Numerical models

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Dynamic Game access control based on Trust

Dynamic Game Access Control based on Trust

引用

IEEE International Conference on Trust, Security and Privacy in Computing and Communications

作者： Shunan Ma State Key Lab. of Inf. Security Inst. of Inf. Eng. Beijing China

ISBN: (纸本)9781467379533

access control refers to the whole suite of mechanisms that are used to govern user access to resources provided by computer systems over networks. Although many access control models have been proposed, such as DAC, MAC and RBAC, the functionality of these access control models is to make authorization decisions based on established access control policies. When the malicious access is identified, the access control system denies the request. However, the malicious entities may keep issuing more malicious access requests not afraid of punishment from the access control system. Such access control models are not adequate in open networks where the identities of entities may not be known. In this paper, we first apply some principles in game theory to analyze current access control models. With respect to behavior of entities, access control can be treated as a game between the requester and the provider entities. then we propose a dynamic game access control model based on trust, which can respond to malicious access. the proposed model should follow the principles of bringing interactive entities to a state of Nash Equilibrium to make access control more effective. In the proposed model, we use access behavior trigger strategy along with a constraint mechanism that provides incentives for entities to perform honest access.

关键词： Trust access control Game theory Network Security

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Redaction based RDF access control Language 14

Redaction based RDF Access Control Language

引用

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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Attribute-Based access control models and Beyond 15

Attribute-Based Access Control Models and Beyond

引用

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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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...

引用

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

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

引用

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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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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Policy models to Protect Resource Retrieval 14

Policy Models to Protect Resource Retrieval

引用

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

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

引用

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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