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共 458 条记录，以下是121-130 订阅

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Automated Coverage-Based Testing of XacmL Policies 18

Automated Coverage-Based Testing of XACML Policies

引用

23rd acm symposium on access control models and technologies (SacmAT)

作者： Xu, Dianxiang Shrestha, Roshan Shen, Ning Boise State Univ Dept Comp Sci Boise ID 83725 USA

ISBN: (纸本)9781450356664

While(1) the standard language XacmL is very expressive for specifying fine-grained access control policies, defects can get into XacmL policies for various reasons, such as misunderstanding of access control requirements, omissions, and coding errors. These defects may result in unauthorized accesses, escalation of privileges, and denial of service. Therefore, quality assurance of XacmL policies for real-world information systems has become an important issue. To address this issue, this paper presents a family of coverage criteria for XacmL policies, such as rule coverage, rule pair coverage, decision coverage, and Modified Condition/Decision Coverage (MC/DC). To demonstrate the assurance levels of these coverage criteria, we have developed methods for automatically generating tests, i.e., access requests, to satisfy the coverage criteria using a constraint solver. We have evaluated these methods through mutation analysis of various policies with different levels of complexity. The experiment results have shown that the rule coverage is far from adequate for revealing the majority of defects in XacmL policies, and that both MC/DC and decision coverage tests have outperformed the existing methods for testing XacmL policies. In particular, MC/DC tests achieve a very high level of quality assurance of XacmL policies.

关键词： XacmL access control coverage criteria test generation mutation testing

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Authorization Framework for Secure Cloud Assisted Connected Cars and Vehicular Internet of Things 18

Authorization Framework for Secure Cloud Assisted Connected ...

引用

23rd acm symposium on access control models and technologies (SacmAT)

作者： Gupta, Maanak Sandhu, Ravi Univ Texas San Antonio Dept Comp Sci ICS C SPECC San Antonio TX 78249 USA

ISBN: (纸本)9781450356664

Internet of Things has become a predominant phenomenon in every sphere of smart life. Connected Cars and Vehicular Internet of Things, which involves communication and data exchange between vehicles, traffic infrastructure or other entities are pivotal to realize the vision of smart city and intelligent transportation. Vehicular Cloud offers a promising architecture wherein storage and processing capabilities of smart objects are utilized to provide on-the-fly fog platform. Researchers have demonstrated vulnerabilities in this emerging vehicular IoT ecosystem, where data has been stolen from critical sensors and smart vehicles controlled remotely. Security and privacy is important in Internet of Vehicles (IoV) where access to electronic control units, applications and data in connected cars should only be authorized to legitimate users, sensors or vehicles. In this paper, we propose an authorization framework to secure this dynamic system where interactions among entities is not pre-defined. We provide an extended access control oriented (E-ACO) architecture relevant to IoV and discuss the need of vehicular clouds in this time and location sensitive environment. We outline approaches to different access control models which can be enforced at various layers of E-ACO architecture and in the authorization framework. Finally, we discuss use cases to illustrate access control requirements in our vision of cloud assisted connected cars and vehicular IoT, and discuss possible research directions.

关键词： access control Internet of Things Vehicular Internet of Things Connected Cars Vehicular Cloud Internet of Vehicles Big Data Attributes Based Trust Fog Computing Cloud Computing

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Securing Named Data Networks: Challenges and the Way Forward 18

Securing Named Data Networks: Challenges and the Way Forward

引用

23rd acm symposium on access control models and technologies (SacmAT)

作者： Bertino, Elisa Nabeel, Mohamed Purdue Univ W Lafayette IN 47907 USA Qatar Comp Res Inst Doha Qatar

ISBN: (纸本)9781450356664

Despite decades of research on the Internet security, we constantly hear about mega data breaches and malware infections affecting hundreds of millions of hosts. The key reason is that the current threat model of the Internet relies on two assumptions that no longer hold true: (1) Web servers, hosting the content, are secure, (2) each Internet connection starts from the original content provider and terminates at the content consumer. Internet security is today merely patched on top of the TCP/IP protocol stack. In order to achieve comprehensive security for the Internet, we believe that a clean-slate approach must be adopted where a content based security model is employed. Named Data Networking (NDN) is a step in this direction which is envisioned to be the next generation Internet architecture based on a content centric communication model. NDN is currently being designed with security as a key requirement, and thus to support content integrity, authenticity, confidentiality and privacy. However, in order to meet such a requirement, one needs to overcome several challenges, especially in either large operational environments or resource constrained networks. In this paper, we explore the security challenges in achieving comprehensive content security in NDN and propose a research agenda to address some of the challenges.

关键词： Named Data Networks Edge Computing access control Security Confidentiality Integrity Privacy

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Data Breach and Multiple Points to Stop It 18

Data Breach and Multiple Points to Stop It

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23rd acm symposium on access control models and technologies (SacmAT)

作者： Yao, Danfeng (Daphne) Virginia Tech Dept Comp Sci Blacksburg VA 24061 USA

ISBN: (纸本)9781450356664

Preventing unauthorized access to sensitive data is an exceedingly complex access control problem. In this keynote, I will break down the data breach problem and give insights into how organizations could and should do to reduce their risks. The talk will start with discussing the technical reasons behind some of the recent high-profile data breach incidents (e.g., in Equifax, Target), as well as pointing out the threats of inadvertent or accidental data leaks. Then, I will show that there are usually multiple points to stop data breach and give an overview of the relevant state-of-the-art solutions. I will focus on some of the recent algorithmic advances in preventing inadvertent data loss, including set-based and alignment-based screening techniques, outsourced screening, and GPU-based performance acceleration. I will also briefly discuss the role of non-technical factors (e.g., organizational culture on security) in data protection. Because of the cat-and-mouse-game nature of cybersecurity, achieving absolute data security is impossible. However, proactively securing critical data paths through strategic planning and placement of security tools will help reduce the risks. I will also point out a few exciting future research directions, e.g., on data leak detection as a cloud security service and deep learning for reducing false alarms in continuous authentication and the prickly insider-threat detection.

关键词： Data breach data loss prevention access control multiple point of prevention inadvertent data leak software security system security anomaly detection ransomware security practices

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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...

引用

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

ISBN: (纸本)9781450338028

The proceedings contain 22 papers. The topics discussed include: state-aware network access management for software-defined networks;an empirical study on user access control in online social networks;an application restriction system for bring-your-own-device scenarios;tri-modularization of firewall policies;enabling dynamic access control for controller applications in software-defined networks;a context-aware system to secure enterprise content;detecting privilege escalation attacks through instrumenting web application source code;data-centric access control for cloud computing;modular synthesis of enforcement mechanisms for the workflow satisfiability problem: scalability and reusability;resiliency policies in access control revisited;and start here: engineering scalable access control systems.

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Poster: Constrained Policy Mining in Attribute Based access control 22

Poster: Constrained Policy Mining in Attribute Based Access ...

引用

22nd acm symposium on access control models and technologies (SacmAT)

作者： Gautam, Mayank Jha, Sadhana Sural, Shamik Vaidya, Jaideep Atluri, Vijayalakshmi IIT Kharagpur Kharagpur W Bengal India Rutgers State Univ New Brunswick NJ USA

ISBN: (纸本)9781450347020

In practical access control systems, it is important to enforce an upper bound on the time taken to respond to an access request. This response time is directly influenced by the size (often called the weight) of each of the underlying access control rules. We present a constrained policy mining algorithm which takes an access control matrix as input and generates a set of attribute based access control (ABAC) rules, such that the weight of each rule is not more than a specified value and the sum of weights of all the rules is minimized. Our initial experiments show encouraging results.

关键词： ABAC Policy mining Constraint Weight

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Mining Relationship-Based access control Policies 22

Mining Relationship-Based Access Control Policies

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22nd acm symposium on access control models and technologies (SacmAT)

作者： Thang Bui Stoller, Scott D. Li, Jiajie SUNY Stony Brook Stony Brook NY 11794 USA

ISBN: (纸本)9781450347020

Relationship-based access control (ReBAC) provides a high level of expressiveness and flexibility that promotes security and information sharing. We formulate ReBAC as an object-oriented extension of attribute-based access control (ABAC) in which relationships are expressed using fields that refer to other objects, and path expressions are used to follow chains of relationships between objects. ReBAC policy mining algorithms have potential to significantly reduce the cost of migration from legacy access control systems to ReBAC, by partially automating the development of a ReBAC policy from an existing access control policy and attribute data. This paper presents an algorithm for mining ReBAC policies from access control lists (ACLs) and attribute data represented as an object model, and an evaluation of the algorithm on four sample policies and two large case studies. Our algorithm can be adapted to mine ReBAC policies from access logs and object models. It is the first algorithm for these problems.

关键词： relationship-based access control attribute-based access control policy mining

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Security Analysis and Legal Compliance Checking for the Design of Privacy-friendly Information Systems 22

Security Analysis and Legal Compliance Checking for the Desi...

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22nd acm symposium on access control models and technologies (SacmAT)

作者： Guarda, Paolo Ranise, Silvio Siswantoro, Hari Univ Trento Fac Law Trento Italy FBK Irst Secur & Trust Trento Italy Univ Trento DISI Trento Italy

ISBN: (纸本)9781450347020

Nowadays, most of business practices involve personal data processing of customers and employees. This is strictly regulated by legislation to protect the rights of the data subject. Enforcing regulation into enterprise information system is a non-trivial task that requires an interdisciplinary approach. This paper presents a declarative framework to support the specification of information system designs, purpose-aware access control policies, and the legal requirements derived from the European Data Protection Directive. This allows for compliance checking via a reduction to policy refinement that is supported by available automated tools. We briefly discuss the results of the compliance analysis with a prototype tool on a simple but realistic scenario about the processing of personal data to produce salary slips of employees in an Italian organization.

关键词： EU DPD Legal compliance access control Policies

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POSTER: access control Model for the Hadoop Ecosystem 22

POSTER: Access Control Model for the Hadoop Ecosystem

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22nd acm symposium on access control models and technologies (SacmAT)

作者： Gupta, Maanak Patwa, Farhan Sandhu, Ravi UT San Antonio Dept Comp Sci Inst Cyber Secur One UTSA Circle San Antonio TX 78249 USA

ISBN: (纸本)9781450347020

Apache Hadoop is an important framework for fault-tolerant and distributed storage and processing of Big Data. Hadoop core platform along with other open-source tools such as Apache Hive, Storm, HBase offer an ecosystem to enable users to fully harness Big Data potential. Apache Ranger and Apache Sentry provide access control capabilities to several ecosystem components by offering centralized policy administration and enforcement through plugins. In this work we discuss the access control model for Hadoop ecosystem (referred as HeAC) used by Apache Ranger (release 0.6) and Sentry (release 1.7.0) along with Hadoop 2.x native authorization capabilities. This multi-layer model provides several access enforcement points to restrict unauthorized users to cluster resources. We further outline some preliminary approaches to extend the HeAC model consistent with widely accepted access control models.

关键词： access control Hadoop Ecosystem Big Data Data Lake Role Based Attributes Groups Hierarchy Object Tags

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Poster: On the Safety and Efficiency of Virtual Firewall Elasticity control 22

Poster: On the Safety and Efficiency of Virtual Firewall Ela...

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22nd acm symposium on access control models and technologies (SacmAT)

作者： Li, Hongda Deng, Juan Hu, Hongxin Wang, Kuang-Ching Ahn, Gail-Joon Zhao, Ziming Han, Wonkyu Clemson Univ Clemson SC 29631 USA Arizona State Univ Tempe AZ 85287 USA

ISBN: (纸本)9781450347020

Firewalls have been typically used to enforce network access control. Network Functions Virtualization (NFV) envisions to implement firewall function as software instance (a.k.a virtual firewall). Virtual firewall provides great flexibility and elasticity, which are necessary to protect virtualized environments. In this poster, we propose an innovative virtual firewall controller, VFW controller, which enables safe, efficient and cost-effective virtual firewall elasticity control. In addition, we implement the core components of VFW controller on top of NFV and SDN environments. Our experimental results demonstrate that VFW controller is efficient to provide safe elasticity control of virtual firewalls.

关键词： Virtual Firewall Network Functions Visualization Software-Define Networking Elasticity control

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