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Benchmarking UAQ Solvers 20

Benchmarking UAQ Solvers

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25th acm symposium on access control models and technologies (SacmAT)

作者： Armando, Alessandro Gazzarata, Giorgia Turkmen, Fatih Univ Genoa DIBRIS Genoa Italy Univ Groningen Groningen Netherlands

ISBN: (纸本)9781450375689

the User Authorization Query (UAQ) Problem is key for RBAC systems that aim to offer permission level user-system interaction, where the system automatically determines the roles to activate in order to enable the requested permissions. Finding a solution to a UAQ problem amounts to determining an optimum set of roles to activate in a given session so to obtain some permissions while satisfying a collection of authorization constraints, most notably Dynamic Mutually-Exclusive Roles (DMER) constraints. Although the UAQ Problem is NP-hard, a number of techniques to solve the UAQ problem have been put forward along with encouraging, albeit inconclusive, experimental results. We propose a methodology for designing parametric benchmarks for the UAQ problem and make a novel suite of parametric benchmarks publicly available that allows for the systematic assessment of UAQ solvers over a number of relevant dimensions. By running three prominent UAQ solvers against our benchmarks, we provide a very comprehensive analysis showing (i) the shortcomings of currently available benchmarks, (ii) the adequacy of the proposed methodology and (iii) that the reduction to PMaxSAT is currently the most effective approach to tackling the UAQ problem.

关键词： Role-based access control User Authorization Query Problem Boolean Satisfiability

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Norm-based access control 20

Norm-based Access Control

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25th acm symposium on access control models and technologies (SacmAT)

作者： Ulusoy, Onuralp Yolum, Pinar Univ Utrecht Utrecht Netherlands

ISBN: (纸本)9781450375689

Collaborative systems, such as online social networks or Internet of things, host vast amounts of content that is created and manipulated by multiple users. Co-edited documents or group pictures are prime examples of such co-owned content. Respecting privacy of users in collaborative systems is difficult because the co-owners of the shared content can have conflicting access policies about the content. To address this problem, recent approaches employ group decision making techniques, such as auctions. With these approaches, when a content is to be shared, all co-owners express their privacy preferences through the mechanism (e.g., by bidding) and the group decision mechanism reaches a decision to enable or deny access to the content. However, such mechanisms have to be carried out per content, making them impractical for most realistic settings. We argue that rather than employing a group decision mechanism on each content separately, it is more practical to watch for privacy norms that emerge in systems and make decisions using these norms, when possible. this paper borrows ideas from philosophy to represent privacy norms and develops algorithms to compute them in collaborative systems. We show that when privacy norms are identified correctly, they can enable collaborative systems respect users' privacy as well as decrease the need to engage in a group decision mechanism considerably.

关键词： Privacy Multiagent systems Norms

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ABAC-CC: Attribute-Based access control and Communication control for Internet of things 20

ABAC-CC: Attribute-Based Access Control and Communication Co...

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25th acm symposium on access control models and technologies (SacmAT)

作者： Bhatt, Smriti Sandhu, Ravi Texas A&M Univ Dept Comp & Cyber Secur San Antonio TX 78224 USA Texas A&M Univ Inst Cyber Secur San Antonio TX USA Texas A&M Univ CREST C SPECC Dept Comp Sci San Antonio TX USA

ISBN: (纸本)9781450375689

Internet of things (IoT) is revolutionizing the capabilities of the Internet with billions of connected devices in the cyberspace. these devices are commonly referred to as smart things enabling smart environments, such as Smart Home, Smart Health, Smart Transportation, and overall Smart Communities, together with key enabling technologies like Cloud Computing, Artificial Intelligence (AI) and Machine Learning (ML). Security and privacy are major concerns for today's diverse autonomous IoT ecosystem. Autonomous things and a large amount of data associated with things have fueled significant research in IoT access control and privacy in both academia and industry. To enable futuristic IoT with sustainable growth, dynamic access and communication control framework that adequately addresses security and privacy issues in IoT is inevitable. In this paper, we analyze the access and communication control requirements in Cloud-Enabled IoT (CE-IoT) and propose an attribute-based framework for access control and communication control, known as ABAC-CC, to secure accesses and communications (data flow) between various entities in the IoT architecture. We also introduce a novel Attribute-Based Communication control (ABCC) model, which focuses on securing communications and data flow in IoT and enables users to define privacy policies using attributes of various entities. Furthermore, we analyze the applicability of ABAC-CC in specific IoT application domains, and finally, we present future research directions in the context of Cloud and Edge computing enabled IoT platforms.

关键词： Internet of things Attributes Message Attributes Cloud-Enabled IoT Communication control Attribute-Based Communication control

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Session details: Session 2: access control models 21

Session details: Session 2: Access Control Models

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Proceedings of the 26th acm symposium on access control models and technologies

作者： Eleonora Losiouk University of Padova

No abstract available.

ISBN: (纸本)9781450383653

No abstract available.

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Usages of the ContSys Standard: A Position Paper 10th

Usages of the ContSys Standard: A Position Paper

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10th International Conference on New Trends in Model and Data Engineering, MEDI 2021 held with 4th International Workshop on Modeling, Verification and Testing of Dependable Critical Systems, DETECT 2021, symposium on Intelligent and Autonomous Systems, SIAS 2021, 1st Workshop on control Software: Methods, models, and Languages, CSMML 2021, Workshop on Blockchain for Inter-Organizational Collaboration, BIOC 2021 and 1st International Health Data Workshop, HEDA 2021

作者： Kankainen, Kristian Department of Health Technologies Tallinn University of Technology Ehitajate tee 5 Tallinn19086 Estonia

ISBN: (纸本)9783030876562

this position paper presents preliminary findings from an ongoing systematic literature review over the usages of the ContSys standard ISO 13940 [7]. I show that the literature reveals several patterns of how "A system of concepts for the continuity of care" is understood and applied. © 2021, Springer Nature Switzerland AG.

关键词： ISO Standards

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Analysis of access control Enforcement in Android 20

Analysis of Access Control Enforcement in Android

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25th acm symposium on access control models and technologies (SacmAT)

作者： Enck, William North Carolina State Univ Raleigh NC 27695 USA

ISBN: (纸本)9781450375689

Over the past decade, the Android operating system install-base has proliferated to billions of devices, rivaling Microsoft Windows as a top computing platform. One of the most attractive aspects of Android is its vast collection of applications, available from application stores such as Google's Play Store. Developers have been drawn to Android due to its semantically-rich runtime APIs, which simplify the creation of third-party applications. Many of these APIs provide access to security- and privacy-sensitive information and resources such as the device's geographic location, audio recorded from the device's microphone, and the ability to send and receive SMS messages. In providing these APIs to third-party applications, the Android OS has implicitly taken responsibility for their protection, increasing its access control burden. As a result, current versions of Android have thousands of manually placed access control checks throughout the platform. the goal of this talk is to motivate the need for and utility of semi-automated tools to analyze and validate the access control checks that occur within Android's system code. the challenges are two-fold. First, analysis of Android's middleware code is more challenging than that of third-party applications, which has been studied in-depth over the past decade [3-5]. the code spans hundreds of system services, which are implemented in a combination of Java, C++, and C. the system services also have heavy inter-dependencies with one another, frequently invoking entry points in each other using Android's Binder inter-process communication (IPC) framework within the Linux kernel. Second, identifying what is an access control check is nontrivial. While there are well-known checks based on user-authorized permissions and Linux-layer user and group identifiers, system services also use an array of different service-specific checks that must be captured and modeled to assess the correctness of access control enforcement. In t

关键词： Android security access control static program analysis

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Automated Strong Mutation Testing of XacmL Policies 20

Automated Strong Mutation Testing of XACML Policies

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25th acm symposium on access control models and technologies (SacmAT)

作者： Xu, Dianxiang Shrestha, Roshan Shen, Ning Univ Missouri Dept Comp Sci Elect Engn Kansas City MO USA Boise State Univ Dept Comp Sci Boise ID 83725 USA

ISBN: (纸本)9781450375689

While the existing methods for testing XacmL policies have varying levels of effectiveness, none of them can reveal the majority of policy faults. the undisclosed faults may lead to unauthorized access and denial of service. this paper presents an approach to strong mutation testing of XacmL policies that automatically generates tests from the mutants of a given policy. Such mutants represent the targeted faults that may appear in the policy. In this approach, we first compose the strong mutation constraints that capture the semantic difference between each mutant and its original policy. then, we use a constraint solver to derive an access request (i.e., test). the test suite generated from all the mutants of a policy can achieve a perfect mutation score, thus uncover all hypothesized faults or demonstrate their absence. Based on the mutation-based approach, this paper further explores optimal test suite that achieves a perfect mutation score without duplicate tests. To evaluate the proposed approach, our experiments have included all the subject policies in the relevant literature and used a number of new policies. the results demonstrate that: (1) it is scalable to generate a mutation-based test suite to achieve a perfect mutation score, (2) it can be impractical to generate the optimal test suite due to the expensive removal of duplicate tests, (3) different from the results of the existing study, the modified-condition/decision coverage-based method, currently the most effective one, has low mutation scores for several policies.

关键词： access control XacmL mutation testing constraint solving test generation

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Proactive Risk Assessment for Preventing Attribute-Forgery Attacks to ABAC Policies 20

Proactive Risk Assessment for Preventing Attribute-Forgery A...

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25th acm symposium on access control models and technologies (SacmAT)

作者： Rubio-Medrano, Carlos E. Claramunt, Luis Jogani, Shaishavkumar Ahn, Gail-Joon Arizona State Univ Tempe AZ 85287 USA

ISBN: (纸本)9781450375689

Recently, the use of well-defined, security-relevant pieces of run-time information, a.k.a., attributes, has emerged as a convenient paradigm for writing, enforcing, and maintaining authorization policies, allowing for extended flexibility and convenience. However, attackers may try to bypass such policies, along with their enforcement mechanisms, by maliciously forging the attributes listed on them, e.g., by compromising the attribute sources: operative systems, software modules, remote services, etc., thus gaining unintended access to protected resources as a result. In such a context, performing a proper risk assessment of authorization policies, taking into account their inner structure: rules, attributes, combining algorithms, etc., along with their corresponding sources, becomes highly convenient to overcome zero-day vulnerabilities, before they can be later exploited by attackers. With this in mind, we introduce RiskPol, an automated risk assessment framework for authorization policies, which, besides being inspired by well-established techniques for vulnerability analysis such as symbolic execution, also introduces the very first approach for proactively assessing risks in the context of a series of attacks based on unintended attribute manipulation via forgery. We validate our approach by resorting to a set of case studies we performed on both real-life policies originally written in the English language, as well as a set of policies obtained from the literature, which show not only the convenience of our approach for risk assessment, but also reveal that some of those policies are vulnerable to attribute-forgery attacks by just compromising one or two of their attributes.

关键词： Attribute-based access control Risk Management Attribute Forgery Policy Bypassing Zero-Day Vulnerabiities

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Protecting Sensitive Data in Web of Data 10th

Protecting Sensitive Data in Web of Data

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作者： Benaribi, Fethi Imad Malki, Mimoun Faraoun, Kamel Mohamed EEDIS Laboratory Djillali Liabes University of Sidi Bel Abbes Sidi Bel Abbès Algeria Sidi Bel Abbès Algeria

ISBN: (纸本)9783030876562

Over the last few years, the web of data has been increased. It permitted sharing and an interconnection of a large data in several domains and it keeps increasing day by day. However, certain sectors such as health, economic, government, etc., have a limited participation, due to the confidential nature of data. In order to develop the web of data, taking in consideration the confidentiality and the utility of data, we propose in this paper a framework of confidentiality preservation and sharing of the linked data. Our approach provides the means to generate privacy policies that specify the sensitive data to be protected in an Resource Description Framework (RDF) triple. Subsequently the application of the policy on the graph will allow their replacement by their encryption, thus ensuring a balance between confidentiality and utility of data. © 2021, Springer Nature Switzerland AG.

关键词： access control

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BigMEC: Scalable Service Migration for Mobile Edge Computing

BigMEC: Scalable Service Migration for Mobile Edge Computing

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IEEE/acm symposium on Edge Computing (SEC)

作者： Florian Brandherm Julien Gedeon Osama Abboud Max Mühlhäuser Telecooperation Lab TU Darmstadt Germany Huawei Technologies Munich Germany

ISBN: (数字)9781665486118

ISBN: (纸本)9781665486125

the proximity of Mobile Edge Computing offers the potential for offloading low latency closed-loop applications from mobile devices. However, to repair decreases in quality of service (QoS), e.g., resulting from user mobility, the placement of service instances must be continually updated - essential for mission critical applications that cannot tolerate decreased QoS, for example virtual reality or networked control systems. this paper presents BigMEC, a decentralized service placement algorithm that achieves scalable, fast, and high-quality placements by making local service migration decisions immediately when a drop in QoS is detected. the algorithm relies on reinforcement learning to adapt to unknown scenarios and to approximate long-term optimal placement updates by taking future transition costs into account. BigMEC limits each decentralized migration decision to nearby edge sites. thus, decision computation times are independent of the number of nodes in the network and well below 10ms in our experimental setup. Our ablation study validates that, using its scalable approach to decentralized resource conflict resolution, BigMEC quickly approaches optimal placement with increasing local view size, and that it can reliably learn to approximate long-term optimal migration decisions, given only a black-box optimization objective.

关键词： Technological innovation Multi-access edge computing Networked control systems Scalability Quality of service Reinforcement learning Virtual reality

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