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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161-170 订阅

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Proceedings of acm symposium on access control models and technologies, SacmAT

Proceedings of ACM Symposium on Access Control Models and Te...

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

ISBN: (纸本)9781450335560

the proceedings contain 24 papers. the topics discussed include: Mohawk+T: efficient analysis of administrative temporal role-based access control (ATRBAC) policies;automated inference of access control policies for web applications;SecLoc: securing location-sensitive storage in the cloud;a logical approach to restricting access in online social networks;preventing information inference in access control;on missing attributes in access control: non-deterministic and probabilistic attribute retrieval;relationship-based access control for an open-source medical records system;federated access management for collaborative network environments: framework and case study;a prototype to reduce the amount of accessible information;a SMT-based tool for the analysis and enforcement of NATO content-based protection and release policies;towards an automatic top-down role engineering approach using natural language processing techniques;and generating secure images for CAPTCHAs through noise addition.

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NFV-based QoS provision for Software Defined Optical access and residential networks

NFV-based QoS provision for Software Defined Optical Access ...

引用

International Workshop on Quality of Service

作者： Ricardo Flores Moyano David Fernández Luis Bellido Noemí Merayo Juan Carlos Aguado Ignacio de Miguel Departamento de Ingenieria de Sistemas Telematicos Universidad Politecnica de Madrid Spain Grupo de Comunicaciones Opticas Universidad de Valladolid Spain

ISBN: (纸本)9781538627051

the promises of SDN and NFV technologies to boost innovation and to reduce the time-to-market of new services is changing the way in which residential networks will be deployed, managed and maintained in the near future. New user-centric management models for residential networks combining SDN-based residential gateways and cloud technologies have already been proposed, providing flexibility and ease of deployment. Extending the scope of SDN technologies to optical access networks and bringing cloud technologies to the edge of the network enable the creation of advanced residential networks in which complex service function chains can be established to provide traffic differentiation. In this context, this paper defines a novel network management model based on a user-centric approach that allows residential users to define and control access network resources and the dynamic provision of traffic differentiation to fulfill QoS requirements.

关键词： Cloud computing Proposals Quality of service control systems Optical fiber networks Logic gates Broadband communication

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An Architecture for Spectrum Management and Coordinated control in 5G Heterogeneous Networks 13

An Architecture for Spectrum Management and Coordinated Cont...

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13th International symposium on Wireless Communication Systems (ISWCS)

作者： Kliks, Adrian Bossy, Bartosz Khan, Shah Nawaz Riggio, Roberto Goratti, Leonardo Poznan Univ Tech Chair Radio Commun Fac Elect & Telecommun Poznan Poland CREATE NET Via Alla Cascata 56-D I-38123 Trento Italy

ISBN: (纸本)9781509020614

Achieving the Key Performance Indicators defined for 5G networks will require the implementation of new technologies and the deployment of dense heterogeneous networks, using different Radio access technologies and several chunks of the RF spectrum. An important consideration in this context is how the resultant diversity can be controlled and how the valuable radio resources could be managed and controlled effectively. this paper presents a new architecture for spectrum management and sharing on top of a coordinated network control layer in 5G heterogeneous networks. the architecture is based on the abstraction of networks' resources and the virtualization of control aspects in order to support 5G spectrum management and sharing models. We present the architecture and its main functional entities together with its internal and external interfaces. We also provide a mapping of the diverse set of functionalities and requirements identified for Licensed Shared access to other spectrum sharing models under consideration for 5G networks.

关键词： Heterogeneous networks

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Earp: Principled Storage, Sharing, and Protection for Mobile Apps 13

Earp: Principled Storage, Sharing, and Protection for Mobile...

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13th USENIX symposium on Networked Systems Design and Implementation (NSDI)

作者： Xu, Yuanzhong Hunt, Tyler Kwon, Youngjin Georgiev, Martin Shmatikovt, Vitaly Witchel, Emmett Univ Texas Austin Austin TX 78712 USA Cornell Tech New York NY USA

ISBN: (纸本)9781931971294

Modern mobile apps need to store and share structured data, but the coarse-grained access-control mechanisms in existing mobile operating systems are inadequate to help apps express and enforce their protection requirements. We design, implement, and evaluate a prototype of Earp, a new mobile platform that uses the relational model as the unified OS-level abstraction for both storage and inter-app services. Earp provides apps with structure-aware, OS-enforced access control, bringing order and protection to the Wild West of mobile data management.

关键词： access control

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On the Temporal access control Implementation at the Logical Level of Relational Databases 11

On the Temporal Access Control Implementation at the Logical...

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13th International Scientific and Technical Conference Computer Sciences and Information technologies (CSIT)

作者： Zhezhnych, Pavlo Burak, Teodor Chyrka, Oleg Lviv Polytech Natl Univ Dept Social Commun & Informat Act Lvov Ukraine Lviv Polytech Natl Univ Informat Ctr Lvov Ukraine

ISBN: (纸本)9781509027392

Any information system built on a database can not function without data access control component. Role-Based access control (RBAC) models are the most acceptable for large database operating. there are several approaches to implementation of modified RBAC models that support hierarchical and temporal access control. this paper considers an approach of the implementation at the logical level of a database with a set of user role permissions tables and a set of data access control views. the tables and views are created and used according to defined rules of temporal access permissions distribution.

关键词： temporal access control role-based access database table view SELECT-query database management system

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Resiliency policies in access control revisited 16

Resiliency policies in access control revisited

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21st acm symposium on access control models and technologies, SacmAT 2016

作者： Crampton, Jason Gutin, Gregory Watrigant, Rémi Royal Holloway University of London EghamTW20 9QY United Kingdom

ISBN: (纸本)9781450338028

Resiliency is a relatively new topic in the context of access control. Informally, it refers to the extent to which a multi-user computer system, subject to an authorization policy, is able to continue functioning if a number of authorized users are unavailable. Several interesting problems connected to resiliency were introduced by Li, Wang and Tripunitara [13], many of which were found to be intractable. In this paper, we show that these resiliency problems have unexpected con-nections with the workow satisffability problem (WSP). In particular, we show that an instance of the resiliency checking problem (RCP) may be reduced to an instance of WSP. We then demonstrate that recent advances in our un-derstanding of WSP enable us to develop fixed-parameter tractable algorithms for RCP. Moreover, these algorithms are likely to be useful in practice, given recent experimental work demonstrating the advantages of bespoke algorithms to solve WSP. We also generalize RCP in several differ-ent ways, showing in each case how to adapt the reduc-Tion to WSP. Li et al. also showed that the coexistence of resiliency policies and static separation-of-duty policies gives rise to further interesting questions. We show how our reduction of RCP to WSP may be extended to solve these problems as well and establish that they are also fixed-parameter tractable. © 2016 acm.

关键词： Problem solving

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Sieve: Cryptographically Enforced access control for User Data in Untrusted Clouds 13

Sieve: Cryptographically Enforced Access Control for User Da...

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13th USENIX symposium on Networked Systems Design and Implementation (NSDI)

作者： Wang, Frank Mickens, James Zeldovich, Nickolai Vaikuntanathan, Vinod MIT CSAIL Cambridge MA 02139 USA Harvard Univ Cambridge MA 02138 USA

ISBN: (纸本)9781931971294

Modern web services rob users of low-level control over cloud storage-a user's single logical data set is scattered across multiple storage silos whose access controls are set by web services, not users. the consequence is that users lack the ultimate authority to determine how their data is shared with other web services. In this paper, we introduce Sieve, a new platform which selectively (and securely) exposes user data to web services. Sieve has a user-centric storage model: each user uploads encrypted data to a single cloud store, and by default, only the user knows the decryption keys. Given this storage model, Sieve defines an infrastructure to support rich, legacy web applications. Using attribute-based encryption, Sieve allows users to define intuitively understandable access policies that are cryptographically enforceable. Using key homomorphism, Sieve can re-encrypt user data on storage providers in situ, revoking decryption keys from web services without revealing new keys to the storage provider. Using secret sharing and two-factor authentication, Sieve protects cryptographic secrets against the loss of user devices like smartphones and laptops. the result is that users can enjoy rich, legacy web applications, while benefiting from cryptographically strong controls over which data a web service can access.

关键词： Web services

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Towards access control for Isolated Applications 13

Towards Access Control for Isolated Applications

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13th International Joint Conference on e-Business and Telecommunications (ICETE)

作者： Belyaev, Kirill Ray, Indrakshi Colorado State Univ Dept Comp Sci Ft Collins CO 80523 USA

ISBN: (纸本)9789897581960

With the advancements in contemporary multi-core CPU architectures, it is now possible for a server operating system (OS), such as Linux, to handle a large number of concurrent application services on a single server instance. Individual application components of such services may run in different isolated runtime environments, such as chrooted jails or application containers, and may need access to system resources and the ability to collaborate and coordinate with each other in a regulated and secure manner. We propose an access control framework for policy formulation, management, and enforcement that allows access to OS resources and also permits controlled collaboration and coordination for service components running in disjoint containerized environments under a single Linux OS server instance. the framework consists of two models and the policy formulation is based on the concept of policy classes for ease of administration and enforcement. the policy classes are managed and enforced through a Linux Policy Machine (LPM) that acts as the centralized reference monitor and provides a uniform interface for accessing system resources and requesting application data and control objects. We present the details of our framework and also discuss the preliminary implementation to demonstrate the feasibility of our approach.

关键词： access control Service and Systems Design Inter-application Communication

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Performance Improvement in WLAN and LTE Based on Backlog control Middleware 2016

Performance Improvement in WLAN and LTE Based on Backlog Con...

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13th Annual International Conference on Mobile and Ubiquitous Systems - Computing, Networking and Services (MobiQuitous)

作者： Shimada, Ayumi Oguchi, Masato Yamaguchi, Saneyasu Kaartinen, Heidi Heikkila, Marjo Jamsa, Joni Ochanomizu Univ Dept Informat Sci Tokyo Japan Kogakuin Univ Tokyo Japan Centria Univ Appl Sci Centria Res & Dev Ylivieska Finland

ISBN: (纸本)9781450347594

Smartphones have highly functional operating systems similar to PCs. their communication throughput depends on behavior of Transmission control Protocol (TCP). Modern loss-based TCP algorithms take aggressive congestion window (CWND) control strategies in order to gain better throughput, but such strategies may cause a large number of packets to be backlogged and eventually dropped at the entry point to the wireless access network. this problem applies not only to the downstream TCP sessions but also to the upstream TCP sessions when the terminal is connected via a wireless network, such as Wireless Local Area Network (WLAN) and Long Term Evaluation (LTE) network, which disregards the size of packets in its scheduling. this paper focuses on the ACK packet backlog problem with the upstream TCP sessions, and proposes a CUBIC based CWND control mechanism as part of the middleware for the Android terminals. It utilizes the Round Trip Time (RTT) as an indication for the TCP ACK backlog condition at the WLAN AP and LTE base station, and controls the upper and lower bounds of its CWND size to suppress excessive transmissions of own TCP DATA packets. Our experimental study with up to seven Android terminals shows that the proposed mechanism can improve both aggregate throughput and fairness of the WLAN. In addition, our evaluation on LTE network demonstrates that the method suitably controls congestion and communication delay also on LTE network.

关键词： TCP congestion control CWND RTT Android

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the Entity Labeling Pattern for Modeling Operating Systems access control 1

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12th International Joint Conference on E-Business and Telecommunications (ICETE)

作者： Amthor, Peter Ilmenau Univ Technol POB 100565 D-98684 Ilmenau Germany

ISBN: (数字)9783319302225

ISBN: (纸本)9783319302225;9783319302218

To meet tightening security requirements, modern operating systems enforce mandatory access control based on formal security policies. To ensure the critical property of policy correctness, formal methods and models for both their specification and verification are used. the variety of these approaches reflects the diversity and heterogeneity of policy semantics, which makes policy engineering an intricate and error-prone process. therefore, a common formal framework is needed that unifies both diverse access control systems on the one hand and diverse formal criteria of correctness on the other hand. this paper presents a step towards this goal. We propose to leverage core-based model engineering, a uniform approach to policy formalization, and refine it by adding typical semantic abstractions of contemporary policy-controlled operating systems. this results in a simple, yet highly flexible framework for formalization, specification and analysis of operating system security policies. We substantiate this claim by applying our method to the SELinux system and demonstrating the practical usage of the resulting model.

关键词： Security engineering Security policies access control models Operating system security SELinux

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