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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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Policy-by-example for online social networks 12

Policy-by-example for online social networks

引用

17th acm symposium on access control models and technologies, SacmAT'12

作者： Cheek, Gorrell P. Shehab, Mohamed College of Computing and Informatics University of North Carolina at Charlotte Charlotte NC 28223 United States

ISBN: (纸本)9781450312950

We introduce two approaches for improving privacy policy management in online social networks. First, we introduce a mechanism using proven clustering techniques that assists users in grouping their friends for group based policy management approaches. Second, we introduce a policy management approach that leverages a user's memory and opinion of their friends to set policies for other similar friends. We refer to this new approach as Same-As Policy Management. To demonstrate the effectiveness of our policy management improvements, we implemented a prototype Facebook application and conducted an extensive user study. Leveraging proven clustering techniques, we demonstrated a 23% reduction in friend grouping time. In addition, we demonstrated considerable reductions in policy authoring time using Same-As Policy Management over traditional group based policy management approaches. Finally, we presented user perceptions of both improvements, which are very encouraging. Copyright 2012 acm.

关键词： access control

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Fine-grained access control of personal data 12

Fine-grained access control of personal data

引用

17th acm symposium on access control models and technologies, SacmAT'12

作者： Wang, Ting Srivatsa, Mudhakar Liu, Ling IBM Research United States Georgia Tech United States

ISBN: (纸本)9781450312950

the immensity and variety of personal information (e.g., profile, photo, and microblog) on social sites require access control policies tailored to individuals' privacy needs. Today such policies are still mainly specified manually by ordinary users, which is usually coarse-grained, tedious, and error-prone. this paper presents the design, implementation, and evaluation of an automated access control policy specification tool, Xaccess, that helps non-expert users effectively specify who should have access to which part of their data. A series of key features distinguish Xaccess from prior work: 1) it adopts a role-based access control model (instead of the conventional rule-based paradigm) to capture the implicit privacy/interest preference of social site users;2) it employs a novel hybrid mining method to extract a set of semantically interpretable, functional "social roles", from both static network structures and dynamic historical activities;3) based on the identified social roles, confidentiality setting of personal data, and (optional and possibly inconsistent) predefined user-permission assignments, it recommends a set of high-quality privacy settings;4) it allows user feedback in every phase of the process to further improve the quality of the suggested privacy policies. A comprehensive experimental evaluation is conducted over real social network and user study data to validate the efficacy of Xaccess. Copyright 2012 acm.

关键词： access control

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access control for RDF graphs using abstract models 12

Access control for RDF graphs using abstract models

引用

17th acm symposium on access control models and technologies, SacmAT'12

作者： Papakonstantinou, Vassilis Michou, Maria Fundulaki, Irini Flouris, Giorgos Antoniou, Grigoris FORTH-ICS Greece University of Crete Greece University of Huddersfield United Kingdom

ISBN: (纸本)9781450312950

the Resource Description Framework (RDF) has become the defacto standard for representing information in the Semantic Web. Given the increasing amount of sensitive RDF data available on the Web, it becomes increasingly critical to guarantee secure access to this content. In this paper we advocate the use of an abstract access control model to ensure the selective exposure of RDF information. the model is defined by a set of abstract operators and tokens. Tokens are used to label RDF triples with access information. Abstract operators model RDF Schema inference rules and propagation of labels along the RDF Schema (RDFS) class and property hierarchies. In this way, the access label of a triple is a complex expression that involves the labels of the triples and the operators applied to obtain said label. Different applications can then adopt different concrete access policies that encode an assignment of the abstract tokens and operators to concrete (specific) values. Following this approach, changes in the interpretation of abstract tokens and operators can be easily implemented resulting in a very flexible mechanism that allows one to easily experiment with different concrete access policies (defined per context or user). To demonstrate the feasibility of the approach, we implemented our ideas on top of the MonetDB and Post-greSQL open source database systems. We conducted an initial set of experiments which showed that the overhead for using abstract expressions is roughly linear to the number of triples considered;performance is also affected by the characteristics of the dataset, such as the size and depth of class and property hierarchies as well as the considered concrete policy. Copyright 2012 acm.

关键词： access control

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Generative models for access control policies: Applications to role mining over logs with attribution 12

Generative models for access control policies: Applications ...

引用

17th acm symposium on access control models and technologies, SacmAT'12

作者： Molloy, Ian Park, Youngja Chari, Suresh IBM Research TJ Watson Hawthorne NY United States

ISBN: (纸本)9781450312950

We consider a fundamentally new approach to role and policy mining: finding RBAC models which reflect the observed usage of entitlements and the attributes of users. Such policies are interpretable, i.e., there is a natural explanation of why a role is assigned to a user and are conservative from a security standpoint since they are based on actual usage. Further, such "generative" models provide many other benefits including reconciliation with policies based on entitlements, detection of provisioning errors, as well as the detection of anomalous behavior. Our contributions include defining the fundamental problem as extensions of the well-known role mining problem, as well as providing several new algorithms based on generative machine learning models. Our algorithms find models which are causally associated with actual usage of entitlements and any arbitrary combination of user attributes when such information is available. this is the most natural process to provision roles, thus addressing a key usability issue with existing role mining algorithms. We have evaluated our approach on a large number of real life data sets, and our algorithms produce good role decompositions as measured by metrics such as coverage, stability, and generality. We compare our algorithms with traditional role mining algorithms by equating usage with entitlement. Results show that our algorithms improve on existing approaches including exact mining, approximate mining, and probabilistic algorithms;the results are more temporally stable than exact mining approaches, and are faster than probabilistic algorithms while removing artificial constraints such as the number of roles assigned to each user. Most importantly, we believe that these roles more accurately capture what users actually do, the essence of a role, which is not captured by traditional methods. Copyright 2012 acm.

关键词： access control

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A framework integrating attribute-based policies into role-based access control 12

A framework integrating attribute-based policies into role-b...

引用

17th acm symposium on access control models and technologies, SacmAT'12

作者： Huang, Jingwei Nicol, David M. Bobba, Rakesh Huh, Jun Ho Information Trust Institute University of Illinois at Urbana-Champaign 1308 W. Main St. Urbana IL 61801 United States

ISBN: (纸本)9781450312950

Integrated role-based access control (RBAC) and attribute-based access control (ABAC) is emerging as a promising paradigm. this paper proposes a framework that uses attribute based policies to create a more traditional RBAC model. RBAC has been widely used, but has weaknesses: it is laborintensive and time-consuming to build a model instance, and a pure RBAC system lacks flexibility to efficiently adapt to changing users, objects, and security policies. Particularly, it is impractical to manually make (and maintain) user to role assignments and role to permission assignments in industrial context characterized by a large number of users and/or security objects. ABAC has features complimentary to RBAC, and merging RBAC and ABAC has become an important research topic. this paper proposes a new approach to integrating ABAC with RBAC, by modeling RBAC in two levels. the aboveground level is a standard RBAC model extended with "environment". this level retains the simplicity of RBAC, supporting RBAC model verification/review. the "underground" level is used to represent security knowledge in terms of attribute-based policies, which automatically create the simple RBAC model in the aboveground level. these attribute-based policies bring to RBAC the advantages of ABAC: they are easy to build and easy to adapt to changes. Using this framework, we tackle the problem of permission assignment for large scale applications. this model is motivated by the characteristics and requirements of industrial control systems, and reflects in part certain approaches and practices common in the industry. Copyright 2012 acm.

关键词： access control

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xaccess: A Unified User-Centric access control Framework for Web Applications

xAccess: A Unified User-Centric Access Control Framework for...

引用

13th IEEE/IFIP Network Operations and Management symposium

作者： Singh, Kapil IBM T.J. Watson Research Center United States

ISBN: (纸本)9781467302685

With the rapid growth of Web 2.0, users are contributing more and more content on the Internet, in the form of user profiles, blogs, reviews, etc. With this increased sharing comes a pressing need for access control policies and mechanisms to protect the users' privacy. access control has remained largely centralized and under the control of the web applications. Moreover, most web applications either provide no or very primitive and limited access control. We argue that the owner of any piece of data on the web should be able to decide how to control access to this data. this argument should hold not only for the web applications contributing data, but also for the contributing users. In other words, users should be able to choose their own access control models to control the sharing of their data independent of the underlying applications. In this work, we present a novel framework, called xaccess, for providing access control that empowers users to control how they want their data to be accessed. xaccess is analogous to the single sign-on mechanism, however, instead of providing login capability, it provides the user with a single point for defining his access control models and policies for one or multiple applications. On one hand, xaccess enables individual users to use a single unified access control across multiple web applications;and on the other hand, it allows an application to support different access control models deployed by its users with a single model abstraction. We demonstrate the viability of our design by means of a platform prototype. the usability of the platform is further evaluated by developing sample applications using the xaccess APIs.

关键词： access control web applications single sign-on user profiling

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SacmAT'11 - Proceedings of the 16th acm symposium on access control models and technologies

SACMAT'11 - Proceedings of the 16th ACM Symposium on Access ...

引用

16th acm symposium on access control models and technologies, SacmAT 2011

ISBN: (纸本)9781450307215

the proceedings contain 22 papers. the topics discussed include: a decade of model-driven security;deriving role engineering artifacts from business processes and scenario models;an integrated approach for identity and access management in a SOA context;program synthesis in administration of higher-order permissions;relationship-based access control policies and their policy languages;rumpole: a flexible break-glass access control model;SEAL: a logic programming framework for specifying and verifying access control models;transforming provenance using redaction;data leakage mitigation for discretionary access control in collaboration clouds;modeling data flow in socio-information networks: a risk estimation approach;an authorization scheme for version control systems;security validation tool for business processes;and system for automatic estimation of data sensitivity with applications to access control and other applications.

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Performance analysis of underwater acoustic random access networks

Performance analysis of underwater acoustic random access ne...

引用

2012 13th International symposium on Problems of Redundancy in Information and control Systems, RED 2012

作者： Stefanov, Andrej Stojanovic, Milica Information Technology Department IBU Skopje Macedonia Electrical and Computer Engineering Department Northeastern University Boston MA United States

ISBN: (纸本)9781467301701

We analyze the performance of underwater acoustic random access networks. the assumption is that the nodes are distributed in the plane according to a two dimensional Poisson point process. this is a suitable model for a network of bottom mounted nodes. the node-to-node channel is modeled based on an underwater acoustic propagation path loss and fading. We provide a statistical characterization of the network interference, by taking into account the acoustic propagation characteristics, and investigate their impact on the network throughput. the derived results are valid for various fading models and traffic patterns. Numerical examples are presented that illustrate the network performance. © 2012 IEEE.

关键词： Underwater acoustics

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On the performance of access control policy evaluation

On the performance of access control policy evaluation

引用

2012 IEEE 13th International symposium on Policies for Distributed Systems and Networks, POLICY 2012

作者： Griffin, Leigh Butler, Bernard De Leastar, Eamonn Jennings, Brendan Botvich, Dmitri Telecommunications Software and Systems Group Waterford Institute of Technology Waterford Ireland

ISBN: (纸本)9780769547350

there is growing awareness of the need to protect digital resources and services in both corporate and home ICT scenarios. Meanwhile, communication tools tailored for corporations are blurring the line between communication mechanisms and (near) real-time resource sharing. the resulting requirement for near real-time policy-based access control is technically challenging. In a corporate domain, such access control mechanisms must be unobtrusive and comply with strict security objectives. thus policy evaluation performance needs to be considered while addressing traditional security concerns. this paper discusses policy system design principles that motivate a novel Policy Decision Point (PDP) implementation and associated policy language. these principles are consistent with recent web development techniques designed to improve performance and scalability. Given a modern web development stack comprising a language (Javascript), a framework (***) and a database management system (Redis), the proposition is that significant performance gains can be made. Our performance experiments suggest this is the case when, through various design iterations, our prototype PDP implementation is compared with an established, Java/XacmL-based access control PDP implementation. the experiments presented in this paper suggest that newer technologies offer better performance. the analysis suggests that this is because they offer a more efficient data representation and make better use of computing resources. © 2012 IEEE.

关键词： access control

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Session details: access control policies 12

Session details: Access control policies

引用

Proceedings of the 17th acm symposium on access control models and technologies

作者： James Joshi University of Pittsburgh

No abstract available.

ISBN: (纸本)9781450312950

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