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SacmAT 2013 - Proceedings of the 18th acm symposium on access control models and technologies

SACMAT 2013 - Proceedings of the 18th ACM Symposium on Acces...

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18th acm symposium on access control models and technologies, SacmAT 2013

ISBN: (纸本)9781450319508

the proceedings contain 30 papers. the topics discussed include: privacy promises that can be kept: a policy analysis method with application to the HIPAA privacy rule;evolving role definitions through permission invocation patterns;ensuring continuous compliance through reconciling policy with usage;least-restrictive enforcement of the Chinese wall security policy;constraint expressions and workflow satisfiability;information flow control for stream processing in clouds;HyXAC: a hybrid approach for XML access control;heuristic safety analysis of access control models;a white-box policy analysis and its efficient implementation;on the notion of redundancy in access control policies;a BigData platform for analytics on access control policies and logs;enabling intensional access control via preference-aware query optimization;and beyond accountability: using obligations to reduce risk exposure and deter insider attacks.

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Reduction of access control Decisions 14

Reduction of Access Control Decisions

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19th acm symposium on access control models and technologies (SacmAT)

作者： Morisset, Charles Zannone, Nicola Newcastle Univ Ctr Cybercrime & Comp Secur Newcastle Upon Tyne Tyne & Wear England Eindhoven Univ Technol Eindhoven Netherlands

ISBN: (纸本)9781450329392

access control has been proposed as"the" solution to prevent unauthorized accesses to sensitive system resources. Historically, access control models use a two-valued decision set to indicate whether an access should be granted or denied. Many access control models have extended the two-valued decision set to indicate, for instance, whether a policy is applicable to an access query or an error occurred during policy evaluation. Decision sets are often coupled with operators for combining decisions from multiple applicable policies. Although a larger decision set is more expressive, it may be necessary to reduce it to a smaller set in order to simplify the complexity of decision making or enable comparison between access control models. Moreover, some access control mechanisms like XacmL v3 uses more than one decision set. the projection from one decision set to the other may result in a loss of accuracy, which can affect the final access decision. In this paper, we present a formal framework for the analysis and comparison of decision sets centered on the notion of decision reduction. In particular, we introduce the notion of safe reduction, which ensures that a reduction can be performed at any level of policy composition without changing the final decision. We demonstrate the framework by analyzing XacmL v3 against the notion of safe reduction. From this analysis, we draw guidelines for the selection of the minimal decision set with respect to a given set of combining operators.

关键词： Policy evaluation access decision XacmL formal analysis

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Towards Fine Grained RDF access control 14

Towards Fine Grained RDF Access Control

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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

the Semantic Web is envisioned as the future of the current web, where the information is enriched with machine understandable semantics. According to the World Wide Web Consortium (W3C), "the Semantic Web provides a common framework that allows data to be shared and reused across application, enterprise, and community boundaries". Among the various technologies that empower Semantic Web, the most significant ones are Resource Description Framework (RDF) and SPARQL, which facilitate data integration and a means to query respectively. Although Semantic Web is elegantly and effectively equipped for data sharing and integration via RDF, lack of efficient means to securely share data pose limitations in practice. In order to make data sharing and integration pragmatic for Semantic Web, we present a query language based secure data sharing mechanism. We extend SPARQL with a new query form called SANITIZE which comprises a set of sanitization operations that are used to sanitize or mask sensitive data within an RDF graph. the sanitization operations can be further leveraged towards RDF access control and anonymization, thus enabling secure sharing of RDF data.

关键词： RDF SPARQL Sanitization access control Security

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Game theoretic Analysis of Multiparty access control in Online Social Networks 14

Game Theoretic Analysis of Multiparty Access Control in Onli...

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19th acm symposium on access control models and technologies (SacmAT)

作者： Hu, Hongxin Ahn, Gail-Joon Zhao, Ziming Yang, Dejun Clemson Univ Clemson SC 29634 USA Arizona State Univ Tempe AZ 85287 USA Colorado Sch Mines Golden CO 80401 USA

ISBN: (纸本)9781450329392

Existing online social networks (OSNs) only allow a single user to restrict access to her/his data but cannot provide any mechanism to enforce privacy concerns over data associated with multiple users. this situation leaves privacy conflicts largely unresolved and leads to the potential disclosure of users' sensitive information. To address such an issue, a MultiParty access control (MPAC) model was recently proposed, including a systematic approach to identify and resolve privacy conflicts for collaborative data sharing in OSNs. In this paper, we take another step to further study the problem of analyzing the strategic behavior of rational controllers in multiparty access control, where each controller aims to maximize her/his own benefit by adjusting her/his privacy setting in collaborative data sharing in OSNs. We first formulate this problem as a multiparty control game and show the existence of unique Nash Equilibrium (NE) which is critical because at an NE, no controller has any incentive to change her/his privacy setting. We then present algorithms to compute the NE and prove that the system can converge to the NE in only a few iterations. A numerical analysis is also provided for different scenarios that illustrate the interplay of controllers in the multiparty control game. In addition, we conduct user studies of the multiparty control game to explore the gap between game theoretic approaches and real human behaviors.

关键词： Multiparty access control Social Networks Game theory

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Privacy-PAC: Privacy-enhanced physical access control 13

Privacy-PAC: Privacy-enhanced physical access control

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13th Workshop on Privacy in the Electronic Society, WPES 2014, in Conjunction with the acm Conference on Computer and Communications Security, acm CCS 2014

作者： Hajny, Jan Dzurenda, Petr Malina, Lukas Cryptology Research Group Brno University of Technology Brno Czech Republic

ISBN: (纸本)9781450331487

the cryptographic privacy-enhancing technologies were originally designed to improve the privacy and digital identity protection in electronic applications, such as cloud services, private Internet databases or communication systems. How-ever, the access to buildings can be controlled in a privacy-respecting way too. In this paper, we introduce the privacy-enhanced physical access control system (Privacy-PAC) based on cryptographic attribute-based authentication protocols. Using the Privacy-PAC, it is possible to control the physical access to restricted areas while respecting the privacy of users. Besides the cryptographic design, we also describe the implementation results on the platforms of smart phones and an embedded verification terminal. Copyright © 2014 acm.

关键词： Smart cards

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Limiting access to Unintentionally Leaked Sensitive Documents Using Malware Signatures 14

Limiting Access to Unintentionally Leaked Sensitive Document...

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19th acm symposium on access control models and technologies (SacmAT)

作者： Guri, Mordechai Kedma, Gabi Carmeli, Buky Elovici, Yuval Ben Gurion Univ Negev Dept Informat Syst Engn Ben Gurion Univ IL-8410501 Beer Sheva Israel Ben Gurion Univ Negev Telekom Innovat Labs Ben Gurion Univ IL-8410501 Beer Sheva Israel

ISBN: (纸本)9781450329392

Organizations are repeatedly embarrassed when their sensitive digital documents go public or fall into the hands of adversaries, often as a result of unintentional or inadvertent leakage. Such leakage has been traditionally handled either by preventive means, which are evidently not hermetic, or by punitive measures taken after the main damage has already been done. Yet, the challenge of preventing a leaked file from spreading further among computers and over the Internet is not resolved by existing approaches. this paper presents a novel method, which aims at reducing and limiting the potential damage of a leakage that has already occurred. the main idea is to tag sensitive documents within the organization's boundaries by attaching a benign detectable malware signature (DMS). While the DMS is masked inside the organization, if a tagged document is somehow leaked out of the organization's boundaries, common security services such as Anti-Virus (AV) programs, firewalls or email gateways will detect the file as a real threat and will consequently delete or quarantine it, preventing it from spreading further. this paper discusses various aspects of the DMS, such as signature type and attachment techniques, along with proper design considerations and implementation issues. the proposed method was implemented and successfully tested on various file types including documents, spreadsheets, presentations, images, executable binaries and textual source code. the evaluation results have demonstrated its effectiveness in limiting the spread of leaked documents.

关键词： Data Leakage Sensitive Document Anti-Virus Program Detectable Malware Signature

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Demonstration Abstract: OpenSky - A Large-scale ADS-B Sensor Network for Research

Demonstration Abstract: OpenSky - A Large-scale ADS-B Sensor...

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13th IEEE/acm International symposium on Information Processing in Sensor Networks (IPSN)

作者： Schaefer, Matthias Strohmeier, Martin Lenders, Vincent Martinovic, Ivan Wilhelm, Matthias TU Kaiserslautern Kaiserslautern Germany Univ Oxford Oxford OX1 2JD England Armasuisse Geneva Switzerland

ISBN: (纸本)9781479931460

the future of air traffic control (ATC) will heavily depend on the Automatic Dependent Surveillance - Broadcast (ADS-B) protocol as a crucial component. ADS-B marks a paradigm change in airspace monitoring as global ATC is switching from an independent, radar-based approach to dependent, satellite-supported surveillance. With ADS-B, aircraft broadcast their own position and other information in short periodic messages to other aircraft and control stations on the ground. As the protocol is becoming mandatory in most airspaces over the next years, it is important that its characteristics and challenges are thoroughly investigated. the large-scale ADS-B data required to do this has not been openly accessible until now, as specialized and expensive infrastructure was needed. We demonstrate OpenSky, a sensor network based on low-cost hardware connected over the Internet, which enables real-world experimental studies. OpenSky works with off-the-shelf sensors run by volunteers distributed over Central Europe. Currently comprising 11 sensors, the sensor network covers an area of 720,000 km(2). We capture more than 30% of Europe's commercial air traffic, offering access to billions of ADS-B messages.

关键词： ADS-B Sensor Networks OpenSky NextGen Air Traffic control

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What Are the Most Important Challenges for access control in New Computing Domains, such as Mobile, Cloud and Cyber-physical Systems? 14

What Are the Most Important Challenges for Access Control in...

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19th acm symposium on access control models and technologies (SacmAT)

作者： Bauer, Lujo Kerschbaum, Florian Carnegie Mellon Univ Pittsburgh PA 15213 USA SAP Karlsruhe Germany

ISBN: (纸本)9781450329392

We are seeing a significant shift in the types and characteristics of computing devices that are commonly used. Today, more smartphones are sold than personal computers. An area of rapid growth are also cloud systems; and our everyday lives are invaded by sensors like smart meters and electronic tickets. the days when most computing resources were managed directly by a computer's operating system are over---data and computation is distributed, and devices are typically always connected via the *** light of this shift, it is important to revisit the basic security properties we desire of computing systems and the mechanisms that we use to provide them. A building block of most of the security we enjoy in today's systems is access control. this panel will examine the challenges we face in adapting the access control models, techniques, and tools produced thus far to today's and tomorrow's computing environments. Key characteristics of these new systems that may require our approach to access control to change is that in many (e.g., cloud) systems users do not directly control their data; that a vast population of users operating mobile and other new devices has very little education in their use; and that cyber-physical systems permeate our environment to the point where they are often invisible to their *** control comprises enforcement systems, specification languages, and policy-management tools or approaches. In each of these areas the shifting computing landscape leaves us examining how current technology can be applied to new contexts or looking for new technology to fill the gap. Enforcement of access-control policy based on a trusted operating system, for example, does not cleanly translate to massively distributed, heterogeneous computing environments; to environments with many devices that are minimally administered or administered with minimal expertise; and to potentially untrusted clouds that hold sensitive data and computations that belo

关键词： Panel access control Challenges

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Re-thinking Networked Privacy, Security, Identity and access control in our Surveillance States 14

Re-thinking Networked Privacy, Security, Identity and Access...

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19th acm symposium on access control models and technologies (SacmAT)

作者： Clement, Andrew Univ Toronto Fac Informat 140 St George St Toronto ON M5S 3G6 Canada

ISBN: (纸本)9781450329392

Mass surveillance activities by the security agencies of the Five Eyes countries (e.g. NSA, CSEC, etc) pose a significant challenge to those who care about the privacy, security and other democratic rights related to our burgeoning digitally mediated communications. the on-going media coverage of the Snowden documents has brought unprecedented attention to longstanding concerns about whether and how individuals can exercise effective control over their personal information as we increasingly lead our lives on-line. the revelations are also undermining comfortable assumptions about the institutions and infrastructures we depend on for the efficient and equitable functioning of a democratic society. We've seen agencies mandated to protect our networks compromise once trusted security standards, and secretly hoard vulnerabilities for later exploitation rather than fix them. We are witnesses to government and their corporate partners secretly accessing massive amounts of our data, and grudgingly acknowledge their activities only when forced to by whistleblowers. How can we restore trust in the organizations we interact with and hand our personal data to on a daily basis? How can we require them to be more open, transparent and accountable? What are the technically viable options that can help achieve the reliable protections that many regard as fundamental and wish they could take for granted?Drawing on recent research, this talk will review some of the key surveillance challenges we face in the areas of internet routing and identity authentication. the *** project provides a mapping tool for visualizing the routes data packets take across the internet backbone, and in particular where one's own traffic may be subject to NSA interception at key internet routing choke points. It further documents patterns of "boomerang routing", whereby domestic Canadian traffic is often routed via the US, exposing it to foreign surveillance, and compares the data privacy transpare

关键词： Surveillance Privacy Security

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An information flow control meta-model 13

An information flow control meta-model

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18th acm symposium on access control models and technologies, SacmAT 2013

作者： Kafura, Dennis Gracanin, Denis Department of Computer Science Virginia Tech. Blacksburg VA United States

ISBN: (纸本)9781450319508

In this paper a meta-model for information flow control is defined using the foundation of Barker's access control meta-model. the purposes for defining this meta-model is to achieve a more principled understanding of information flow control, to compare information flow control and access control at an abstract level, and to explore how information flow control and access control might be composed to yield a rich new set of ideas and systems for controlling the dissemination of sensitive information. It is shown that it is possible to define a meta-model for information flow control, that such a model is more complex compared to the access control meta-model, and that the meta-models for information flow control and access control can be composed in a conceptually straightforward way. Copyright © acm.

关键词： access control

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