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检索条件"任意字段=10th ACM Symposium on Access Control Models and Technologies"

共 496 条记录，以下是121-130 订阅

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CAOS: Concurrent-access Obfuscated Store 19

CAOS: Concurrent-Access Obfuscated Store

引用

24th acm symposium on access control models and technologies (SacmAT)

作者： Ordean, Mihai Ryan, Mark Galindo, David Univ Birmingham Birmingham W Midlands England Fetch AI Cambridge England

ISBN: (纸本)9781450367530

this paper proposes Concurrent-access Obfuscated Store (CAOS), a construction for remote data storage that provides access-pattern obfuscation in a honest-but-curious adversarial model, while allowing for low bandwidth overhead and client storage. Compared to other approaches, the main advantage of CAOS is that it supports concurrent access without a proxy, for multiple read-only clients and a single read-write client. Concurrent access is achieved by letting clients maintain independent maps that describe how the data is stored. Even though the maps might diverge from client to client, the protocol guarantees that clients will always have access to the data. Efficiency and concurrency are achieved at the expense of perfect obfuscation: in CAOS the extent to which access patterns are hidden is determined by the resources allocated to its built-in obfuscation mechanism. To assess this trade-off we provide both a security and a performance analysis of CAOS. We additionally provide a proof-of-concept implementation(1).

关键词： data obfuscation concurrent-access obfuscated store access pattern

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CloudProtect - A Cloud-based Software Protection Service 19

CloudProtect - A Cloud-based Software Protection Service

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24th acm symposium on access control models and technologies (SacmAT)

作者： Schaad, Andreas Grohmann, Bjeorn Winzenried, Oliver Univ Appl Sci Offenburg Badstr 24 D-77652 Offenburg Germany Wibu Syst AG Ruppurer Str 52 D-76137 Karlsruhe Germany

ISBN: (纸本)9781450367530

Protecting software from illegal access, intentional modification or reverse engineering is an inherently difficult practical problem involving code obfuscation techniques and real-time cryptographic protection of code. In traditional systems a secure element (the "dongle") is used to protect software. However, this approach suffers from several technical and economical drawbacks such as the dongle being lost or broken. We present a system that provides such dongles as a cloud service, and more importantly, provides the required cryptographic material to control access to software functionality in real-time. this system is developed as part of an ongoing nationally funded research project and is now entering a first trial stage with stakeholders from different industrial sectors.

关键词： Software protection cryptographic access control cloud service

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On the potential of distance bounding based on UWB received signal strength 10

On the potential of distance bounding based on UWB received ...

引用

10th International Conference on Pervasive and Parallel Computing, Communication and Sensors, PECCS 2020

作者： Botler, Leo Ribeiro, Leandro Batista Diwold, Konrad Römer, Kay Institute for Technical Informatics Graz University of Technology Austria Pro2Future Austria

ISBN: (纸本)9789897584770

Distance bounding has gained attention in the last decades due to the increasing need for security in applications, such as contactless payment and keyless access control. In such applications, it is important to verify if the two entities participating in a transaction are geographically close to each other. In other applications, it is critical to guarantee that the two entities are not too close, e.g., human and machines interacting in the same environment. A distance fraud is a known class of attacks in this context, and it has been shown that particular attacks within this class can be successfully applied to any distance estimation approach relying on round-trip time-of-flight measurements. In this paper we discuss the feasibility of detecting such attacks with signal strength estimations, an approach which was deemed unsuitable for distance bounding by previous related studies. We show that our method can detect attacks in case a dishonest prover does not respect the given bounds by using path-loss models available in the literature. © 2020 by SCITEPRESS - Science and Technology Publications, Lda. All rights reserved

关键词： access control

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HITC: Data Privacy in Online Social Networks with Fine-Grained access control 19

HITC: Data Privacy in Online Social Networks with Fine-Grain...

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24th acm symposium on access control models and technologies (SacmAT)

作者： Abdulla, Ahmed Khalil Bakiras, Spiridon Hamad Bin Khalifa Univ Coll Sci & Engn Div Informat & Comp Technol Doha Qatar

ISBN: (纸本)9781450367530

Online Social Networks (OSNs), such as Facebook and Twitter, are popular platforms that enable users to interact and socialize through their networked devices. the social nature of such applications encourages users to share a great amount of personal data with other users and the OSN service providers, including pictures, personal views, location check-ins, etc. Nevertheless, recent data leaks on major online platforms demonstrate the ineffectiveness of the access control mechanisms that are implemented by the service providers, and has led to an increased demand for provably secure privacy controls. To this end, we introduce Hide In the Crowd (HITC), a flexible system that leverages encryption-based access control, where users can assign arbitrary decryption privileges to every data object that is posted on the OSN platforms. the decryption privileges can be assigned on the finest granularity level, for example, to a hand-picked group of users. HITC is designed as a browser extension and can be integrated to any existing OSN platform without the need for a third-party server. We describe our prototype implementation of HITC over Twitter and evaluate its performance and scalability.

关键词： Data privacy access control hidden vector encryption online social networks

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Speckle-contrast imaging of pathological tissue microhemodynamics in the development of various diabetes models 7

Speckle-contrast imaging of pathological tissue microhemodyn...

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Saratov Fall Meeting (SFM) / 7th International symposium on Optics and Biophotonics - Optical and Nano-technologies for Biology and Medicine

作者： Dyachenko (Timoshina), Polina A. Alexandrov, Denis A. Bucharskaya, Alla B. Tuchin, Valery V. Saratov NG Chernyshevskii State Univ Res Educ Inst Opt & Biophoton Saratov Russia Tomsk State Univ Interdisciplinary Lab Biophoton Tomsk Russia Saratov State Med Univ Saratov Russia RAS Inst Precis Mech & Control Lab Laser Diagnost Tech & Living Syst Moscow Russia

ISBN: (纸本)9781510637191

the study of blood microcirculation is one of the most important problems of the medicine. this is caused by the fact that many diseases, such as cardio-vascular diseases, atherosclerosis, diabetes, chronic venous insufficiency, oncology diseases, cause functional and morphological changes of microcirculation of blood flow. the results of experimental study of changes of blood microcirculation of pancreas in rats with diabetes measured by using Laser Speckle Contrast Imaging (LSCI) at application of optical clearing agents are presented. Laser speckle contrast techniques are based on the spatial and temporal statistics of the speckle pattern, calculating of contrast of time-averaged dynamic speckles in dependence on the exposure time at the registration of the speckle-modulated images. In research, 38 Wistar rats weighing 300-500 g were used. Alloxan induced animal model and streptozotocin model of diabetes was explored. the influence of solution of glycerol, Omnipaque (R)-300 was investigated. Application of 70%-aqueous glycerol solution demonstrates 50%-decrease of blood flow velocity in the group of aloxan diabetic animals, to 10th min blood flow velocity was completely restored. In a group of animals with streptozotocin diabetes, the blood flow rate decreased by 54%, by 10 minutes the speed did not reach the initial value. Blood flow in the control group almost stopped, to 10 min has not recovered. Application of Omnipaque (R)-300 demonstrates 65%-increase of blood flow in the group of alloxan diabetic animals and an increase of bloode flow in the first 2 minutes of applying the solution by 45%. In both cases to 10th min, blood flow velocity was completely restored. Blood flow in the control group did not show any noticeable changes.

关键词： laser speckles speckle-contrast microhemodynamics optical clearing agent diabetes pancreas pathological tissue blood microcirculation

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Brokering Policies and Execution Monitors for IoT Middleware 19

Brokering Policies and Execution Monitors for IoT Middleware

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24th acm symposium on access control models and technologies (SacmAT)

作者： Carranza, Juan Carlos Fuentes Fong, Philip W. L. Univ Calgary Calgary AB Canada

ISBN: (纸本)9781450367530

Event-based systems lie at the heart of many cloud-based Internet-of-things (IoT) platforms. this combination of the Broker architectural style and the Publisher-Subscriber design pattern provides a way for smart devices to communicate and coordinate with one another. the present design of these cloud-based IoT frameworks lacks measures to (i) protect devices against malicious cloud disconnections, (ii) impose information flow control among communicating parties, and (iii) enforce coordination protocols in the presence of compromised devices. In this work, we propose to extend the modular event-based system architecture of Fiege et al., to incorporate brokering policies and execution monitors, in order to address the three protection challenges mentioned above. We formalized the operational semantics of our protection scheme, explored how the scheme can be used to enforce BLP-style information flow control and RBAC-style protection domains, implemented the proposal in an open-source MQTT broker, and evaluated the performance impact of the protection mechanisms.

关键词： Internet of things Middleware MQTT access control Brokering Policy Execution Monitor Edit Automata Information Flow control History-Based access control Performance Evaluation

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Toward Detection of access control models from Source Code via Word Embedding 19

Toward Detection of Access Control Models from Source Code v...

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24th acm symposium on access control models and technologies (SacmAT)

作者： Heaps, John Wang, Xiaoyin Breaux, Travis Niu, Jianwei Univ Texas San Antonio San Antonio TX 78249 USA Carnegie Mellon Univ Pittsburgh PA 15213 USA

ISBN: (纸本)9781450367530

Advancement in machine learning techniques in recent years has led to deep learning applications on source code. While there is little research available on the subject, the work that has been done shows great potential. We believe deep learning can be leveraged to obtain new insight into automated access control policy verification. In this paper, we describe our first step in applying learning techniques to access control, which consists of developing word embeddings to bootstrap learning tasks. We also discuss the future work on identifying access control enforcement code and checking access control policy violations, which can be enabled by word embeddings.

关键词： word embeddings deep learning access control

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A Rule-based Approach to the Decidability of Safety of ABACα 19

A Rule-based Approach to the Decidability of Safety of ABACα

引用

24th acm symposium on access control models and technologies (SacmAT)

作者： Marin, Mircea Kutsia, Temur Dundua, Besik West Univ Timisoara Timisoara Romania Johannes Kepler Univ Linz RISC Linz Austria Tbilisi State Univ VIAM Tbilisi Georgia Int Black Sea Univ Tbilisi Georgia

ISBN: (纸本)9781450367530

ABAC(alpha) is a foundational model for attribute-based access control with a minimal set of capabilities to configure many access control models of interest, including the dominant traditional ones: discretionary (DAC), mandatory (MAC), and role-based (RBAC). A fundamental security problem in the design of ABAC is to ensure safety, that is, to guarantee that a certain subject can never gain certain permissions to access certain object(s). We propose a rule-based specification of ABAC(alpha) and of its configurations, and the semantic framework of rho Log to turn this specification into executable code for the operational model of ABAC(alpha). Next, we identify some important properties of the operational model which allow us to define a rule-based algorithm for the safety problem, and to execute it with rho Log. the outcome is a practical tool to check safety of ABAC(alpha) configurations. rho Log is a system for rule-based programming with strategies and built-in support for constraint logic programming (CLP). We argue that rho Log is an adequate framework for the specification and verification of safety of ABAC(alpha) configurations. In particular, the authorization policies of ABAC(alpha) can be interpreted properly by the CLP component of rho Log, and the operations of its functional specification can be described by five strategies defined by conditional rewrite rules.

关键词： attribute based access control (ABAC) rule-based programming safety

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Towards Effective Verification of Multi-Model access control Properties 19

Towards Effective Verification of Multi-Model Access Control...

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24th acm symposium on access control models and technologies (SacmAT)

作者： Berger, Bernhard J. Maeder, Christian Nguempnang, Rodrigue Wete Sohr, Karsten Rubio-Medrano, Carlos Univ Bremen Bremen Germany Arizona State Univ Tempe AZ USA

ISBN: (纸本)9781450367530

Many existing software systems like logistics systems or enterprise applications employ data security in a more or less ad hoc fashion. Our approach focuses on access control such as permission-based discretionary access control (DAC), variants of role-based access control (RBAC) with delegation, and attribute-based access control (ABAC). Typically, software systems implement hybrid access control making an effective security analysis and assessment rather difficult. We propose an analysis methodology to reconstruct access control using a novel modular access control model. Our modular approach allows us to flexibly model exactly those access properties that are relevant for a given system. As formalism we use the Object Constraint Language (OCL) with Ecore from the Eclipse Modeling Framework (EMF). We demonstrate the suitability of our access control model for three software systems: a port community system (PCS), a clinical information system (CIS), and an identity management system (IdMS). For the PCS and CIS we model concrete roles and policies. For the IdMS we evaluate our analysis methodology in-depth by reconstructing access control policies from byte code using the Soot analysis framework as well as model transformation techniques (QVTo). the resulting model helped us to identify design deficiencies. Violated OCL invariants such as for mutually exclusive roles or cardinality constraints revealed non-trivial security vulnerabilities.

关键词： access control Model Permissions RBAC ABAC Delegation OCL Reverse Engineering

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Efficient and Extensible Policy Mining for Relationship-Based access control 19

Efficient and Extensible Policy Mining for Relationship-Base...

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24th acm symposium on access control models and technologies (SacmAT)

作者： Bui, thang Stoller, Scott D. Le, Hieu SUNY Stony Brook Stony Brook NY 11794 USA

ISBN: (纸本)9781450367530

Relationship-based access control (ReBAC) is a flexible and expressive framework that allows policies to be expressed in terms of chains of relationship between entities as well as attributes of entities. ReBAC policy mining algorithms have a potential to significantly reduce the cost of migration from legacy access control systems to ReBAC, by partially automating the development of a ReBAC policy. Existing ReBAC policy mining algorithms support a policy language with a limited set of operators;this limits their applicability. this paper presents a ReBAC policy mining algorithm designed to be both (1) easily extensible (to support additional policy language features) and (2) scalable. the algorithm is based on Bui et al.'s evolutionary algorithm for ReBAC policy mining algorithm. First, we simplify their algorithm, in order to make it easier to extend and provide a methodology that extends it to handle new policy language features. However, extending the policy language increases the search space of candidate policies explored by the evolutionary algorithm, thus causes longer running time and/or worse results. To address the problem, we enhance the algorithm with a feature selection phase. the enhancement utilizes a neural network to identify useful features. We use the result of feature selection to reduce the evolutionary algorithm's search space. the new algorithm is easy to extend and, as shown by our experiments, is more efficient and produces better policies.

关键词： security policy mining attribute-based access control relationship-based access control feature selection

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