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A privacy protection model for location-based social networking services

A privacy protection model for location-based social network...

引用

2014 International Conference on engineering Technology And Applications(ICETA2014)

作者： Rong Tan Wen Si Jian Wang College of Information and Computer Science Shanghai Business School Cyber Physical System R&D Center The Third Research Institute of Ministry of Public Security School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University

Since the location-based social networking services emerged,the location privacy issue has gained widespread concerns from consumers and *** the location history plays an important role in knowledge discovery,many people worry that their privacy will be disclosed *** this paper,we introduce a spatial-temporal cloaking model which follows the k-anonymity principle to protect the location *** corresponding algorithm which can find a minimum cloaking 3D box covering the actual location and its temporal information is proposed as ***,the algorithm is able to prevent the modeled records against the continuous attacks which infer the actual location by computing the overlapping spatial *** experimental results show that the proposed algorithm has a high efficiency.

关键词： privacy model location privacy protection privacy protection mobile computing location-based social networking services location-based services

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Practice of PBL in the Reading Teaching Strategies

Practice of PBL in the Reading Teaching Strategies

引用

2014 International Conference on Information Technology and Career Education

作者： Yingting Wang Jian Wang Hao Sheng Nanjing Yuying Foreign Language School Cyber Physical System R&D Center The Third Research Institute of Ministry of Public Security School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University School of Computer Science and Engineering Beihang University

Combined PBL with some advanced foreign reading teaching strategies,we choose the most suitable way to give lessons and bring up students ability to think of *** on teaching experience for several years,we propose some teaching strategies in English reading teaching to help students improve the efficiency and accuracy of reading with the help of *** practice,students'innovation and cooperation are strengthened and the width and depth of their questions are improved.

关键词： PBL problem-based learning reading teaching strategies

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S2Logger: End-to-End Data Tracking Mechanism for Cloud Data Provenance

S2Logger: End-to-End Data Tracking Mechanism for Cloud Data ...

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12th IEEE International Conference on Trust, security and Privacy in Computing and Communications (TrustCom)

作者： Suen, Chun Hui Ko, Ryan K. L. Tan, Yu Shyang Jagadpramana, Peter Lee, Bu Sung Cyber Security Lab Department of Computer Science University of Waikato Hamilton New Zealand School of Computer Engineering Nanyang Technological University Singapore

ISBN: (纸本)9780769550220

The inability to effectively track data in cloud computing environments is becoming one of the top concerns for cloud stakeholders. This inability is due to two main reasons. Firstly, the lack of data tracking tools built for clouds. Secondly, current logging mechanisms are only designed from a system-centric perspective. There is a need for data-centric logging techniques which can trace data activities (e. g. file creation, edition, duplication, transfers, deletions, etc.) within and across all cloud servers. This will effectively enable full transparency and accountability for data movements in the cloud. In this paper, we introduce S2Logger, a data event logging mechanism which captures, analyses and visualizes data events in the cloud from the data point of view. By linking together atomic data events captured at both file and block level, the resulting sequence of data events depicts the cloud data provenance records throughout the data lifecycle. With this information, we can then detect critical data-related cloud security problems such as malicious actions, data leakages and data policy violations by analysing the data provenance. S2Logger also enables us to address the gaps and inadequacies of existing system-centric security tools.

关键词： Cloud Computing Cloud data provenance data tracking file tracking data tracing cloud computing security accountability in cloud computing cloud computing transparency S2Logger

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Compact and unified hardware architecture for SHA-1 and SHA-256 of trusted mobile computing

Compact and unified hardware architecture for SHA-1 and SHA-...

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作者： Kim, Mooseop Lee, Deok Gyu Ryou, Jaecheol Cyber Security-Convergence Research Department ETRI Daejeon Korea Republic of Division of Computer Science and Engineering Chungnam National University Daejeon Korea Republic of

This paper presents a compact and unified hardware architecture implementing SHA-1 and SHA-256 algorithms that is suitable for the mobile trusted module (MTM), which should satisfy small area and low-power condition. The built-in hardware hash engine in a MTM is one of the most important circuit blocks and dominates the performance of the whole platform because it is used as a key primitive to support most MTM commands concerning to the platform integrity and the command authentication. Unlike the general trusted platform module (TPM) for PCs, the MTM, that is to be employed in mobile devices, has very stringent limitations with respect to available power, circuit area, and so on. Therefore, MTM needs the spatially optimized architecture and design method for the construction of a compact SHA hardware. The proposed hardware for unified SHA-1 and SHA-256 component can compute a sequence of 512-bit data blocks and has been implemented into 12,400 gates of 0.25 μm CMOS process. Furthermore, in the processing speed and power consumption, it shows the better performance in comparison with commercial TPM chips and software-only implementation. The highest operation frequency and throughput of the proposed architecture are 137 MHz and 197.6 Mbps, respectively, which satisfy the processing requirement for the mobile application. © 2012 Springer-Verlag London Limited.

关键词： Mobile computing

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Attack on recent homomorphic encryption scheme over integers

Attack on recent homomorphic encryption scheme over integers

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FTRA 7th International Conference on Multimedia and Ubiquitous engineering, MUE 2013

作者： Yang, Haomiao Kim, Hyunsung Tang, Dianhua College of Computer Science and Engineering UEST of China Chengdu 610054 China Department of Cyber Security Kyungil University Kyungpook Kyungsansi 712-701 Korea Republic of Science and Technology on Communication Security Laboratory Chengdu 610041 China

ISBN: (纸本)9789400767379

At CDCIEM 2012, Yang et al. proposed a new construction of somewhat homomorphic encryption scheme over integers, which is quite efficient in the perspective of the key size. In this paper, we present an effective lattice reduction attack on Yang et al.'s scheme, where it is easy to recover the plaintext by applying LLL algorithm. © 2013 Springer science+Business Media Dordrecht(Outside the USA).

关键词： Cryptography

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A framework for risk-aware role based access control

A framework for risk-aware role based access control

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IEEE Conference on Communications and Network security (CNS)

作者： Khalid Zaman Bijon Ram Krishnan Ravi Sandhu Department of Computer Science Institute for Cyber Security Department of Electrical and Computer Engineering University of Texas at San Antonio

Over the years, role based access control (RBAC) has remained a dominant form of access control both in the industry and academia. More recently, the need for risk awareness in access control has received considerable attention in the research community in light of issues such as insider threats. Although RBAC facilitates risk mitigation via features such as constraints (e.g. static and dynamic separation of duty), a quantified approach of risk awareness/mitigation has emerged as a promising research theme due to its inherent flexibility. In this approach, risk/cost metrics are computed for various entities involved in access control such as users and objects and a risk threshold limits the permissions that can be exercised. The quantified approach accommodates dynamism in access decisions based on contexts/situations such as an employee accessing a sensitive file using a work computer versus accessing using her own device. In this paper, we analyze the difference between the traditional constraint-based risk mitigation and the recent quantified risk-aware approaches in RBAC and propose a framework for introducing risk-awareness in RBAC models that incorporates quantified-risk. We also provide a formal specification of an adaptive risk-aware RBAC model by enhancing the NIST core RBAC model.

关键词： Access control Adaptation models Estimation NIST Monitoring Automation

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Towards an Attribute Based Constraints Specification Language

Towards an Attribute Based Constraints Specification Languag...

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IEEE International Conference on Social Computing (SocialCom)

作者： Khalid Zaman Bijon Ram Krishnan Ravi Sandhu Department of Computer Science Institute for Cyber Security Department of Electrical and Computer Engineering University of Texas at San Antonio

ISBN: (纸本)9781479915194

Recently, attribute based access control (ABAC) has received considerable attention from the security community for its policy flexibility and dynamic decision making capabilities. In ABAC, authorization decisions are based on various attributes of entities involved in the access (e.g., users, subjects, objects, context, etc.). In an ABAC system, correct attribute assignment to different entities is necessary for ensuring appropriate access. Although considerable research has been conducted on ABAC, so far constraints specification on attribute assignment to entities has not been systematically studied in the literature. In this paper, we propose an attribute-based constraints specification language(ABCL) for expressing a variety of constraints on values that different attributes of various entities in the system can take. ABCL can be used to specify constraints on a single attribute or across multiple attributes of a particular entity. Furthermore, constraints on attributes assignment across multiple entities (e.g., attributes of different users) can also be specified. Finally, we demonstrate the usefulness of ABCL in practical usage scenarios including banking domains.

关键词： Banking Authorization Organizations Syntactics Context

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Identity-based privacy preservation framework over u-healthcare system

Identity-based privacy preservation framework over u-healthc...

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FTRA 7th International Conference on Multimedia and Ubiquitous engineering, MUE 2013

作者： Mtonga, Kambombo Yang, Haomiao Yoon, Eun-Jun Kim, Hyunsung Department of IT Convergence Kyungil University 712-701 Kyungsansi Kyungpook Province Korea Republic of College of Computer Science and Engineering UEST of China Chengdu 610054 China Department of Cyber Security Kyungil University 712-701 Kyungsansi Kyungpook Province Korea Republic of

ISBN: (纸本)9789400767379

The digitization of patient health information has brought many benefits and challenges for both the patient and doctor. But security and privacy preservation have remained important challenges for wireless health monitoring systems. Such concerns may result in reluctance and skepticism towards health systems by patients. The reason for this skepticism is mainly attributed to the lack of assurances about the way patient health information is handled and the implications that may result from it on patients' privacy. This paper proposes an identity-based privacy preservation framework over u-healthcare systems. Our framework is based on the concepts of identity-based cryptography and non-interactive key agreement scheme using bilinear pairing. The proposed framework achieves authentication, patient anonymity, un-traceability, patient data privacy and session key secrecy, and resistance against impersonation and replay attacks. © 2013 Springer science+Business Media Dordrecht(Outside the USA).

关键词： Data privacy

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On security with the new Gen2 RFID security framework

On security with the new Gen2 RFID security framework

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IEEE International Conference on RFID

作者： Daniel W. Engels You Sung Kang Junyu Wang Computer Science and Engineering Department Southern Methodist University Dallas Texas USA Cyber Convergence Security Research Division ETRL Daejeon Korea Department of Electrical Engineering KAIST Daejeon Korea Auto-ID Lab Fudan University Shanghai China

Radio frequency identification (RFID) systems compliant to the EPCglobal Generation 2 (Gen2) passive UHF RFID protocol are being deployed in a broad range of applications including access control, automated tolling, personal identification, anti-counterfeiting, and supply chain management. With the broad applications and the demand for ever increasing amounts of on-tag functionality, security on the tag has become a critical enabling functionality in many applications. To address this growing marketplace need, EPCglobal is developing a standard security framework within which security functionality may be integrated seamlessly into the Gen2 protocol. We review the proposed Gen2 security framework and introduce example cryptographic suites to illustrate how to utilize this framework to provide a range of security functionality. We analyze the security of the Gen2 protocol and this new functionality in the context of timing-based attacks. We conclude that the tight communication timings specified in the Gen2 protocol mitigate timing-based attacks; however, the loose timing implementations on commercial interrogators and limited timing enforcement on tags lesson the effectiveness of the specified timing constraints. Further, we conclude that the new security framework allows for the efficient integration of secure functionality that, as specified, is resistant to timing-based attacks; however, we caution that using the delayed response of the new Gen2 security functionality creates new vulnerabilities to timing based attacks such as relay attacks and man-in-the-middle attacks.

关键词： Cryptography Protocols Timing Authentication Passive RFID tags

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A group-centric model for collaboration with expedient insiders in multilevel systems

A group-centric model for collaboration with expedient insid...

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2012 13th International Conference on Collaboration Technologies and Systems, CTS 2012

作者： Bijon, Khalid Zaman Sandhu, Ravi Krishnan, Ram Institute for Cyber Security Department of Computer Science United States Institute for Cyber Security Department of Electrical and Computer Engineering University of Texas at San Antonio United States

ISBN: (纸本)9781467313803

An authorization model for group-centric organizational collaboration has been recently proposed wherein multiple organizations may collaborate via groups [3]. Each group is independent of all others and adheres to the formal semantics of Group-Centric Secure Information Sharing models (g-SIS) [2], [4]. Motivated by [3], in this paper, we develop a model for group-centric collaboration in which an organization forms groups to collaborate with outside consultants on specific projects. A core principle is that such outsiders cannot fit in the existing organizational access control structure as they are not true insiders but rather expedient insiders. In our proposed model, each group duplicates the organizational access control structure in an identical but separate copyinitially without any assignment of users or objects. The group is then populated and maintained by bringing selected true insiders, expedient insiders, and objects together to enable collaboration. The formal model consists of administrative and operational parts covering the complete life-cycle. While the general concepts are applicable regardless of the specific models used for the organizational access control structure, to be concrete we consider the specific case of multilevel systems that enforce lattice-based access control [7]. © 2012 IEEE.

关键词： Semantics

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