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检索条件"机构=Cyber Security in Computer Science and Engineering"

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Towards an Attribute Based Constraints Specification Language

Towards an Attribute Based Constraints Specification Languag...

引用

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...

引用

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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Risk-aware RBAC sessions

Risk-aware RBAC sessions

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8th International Conference on Information Systems security, ICISS 2012

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

ISBN: (纸本)9783642351297

Role Based Access Control (RBAC) has received considerable attention as a model of choice for simplified access control over the past decade. More recently, risk awareness in access control has emerged as an important research theme to mitigate risks involved when users exercise their privileges to access resources under different contexts such as accessing a sensitive file from work versus doing the same from home. In this paper, we investigate how to incorporate "risk" in RBAC - in particular, in RBAC sessions. To this end, we propose an extension to the core RBAC model by incorporating risk awareness in sessions where the risk is bounded by a session-based "risk-threshold." We develop a framework of models for role activation and deactivation in a session based on this threshold. Finally, we provide formal specification of one of these models by enhancing the NIST core RBAC model. © Springer-Verlag 2012.

关键词： Access control

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An intelligent question answering conversational agent using Naïve Bayesian classifier

An intelligent question answering conversational agent using...

引用

2012 IEEE International Conference on Technology Enhanced Education, ICTEE 2012

作者： Niranjan, M. Saipreethy, M.S. Kumar, T. Gireesh Department of Computer Science and Engineering Amrita Vishwa Vidyapeetham Ettimadai India Department of Cyber Security Amrita Vishwa Vidyapeetham Ettimadai India

ISBN: (纸本)9781457707261

In the current scenario, learning has taken a completely new dimension. New methods of teaching like E-learning and collaborative learning etc have computerized the learning process to a large extent. But the teachers' presence is still mandatory at all times. Also the current systems have low reliability so the teacher has to monitor them constantly. To solve this problem this paper introduces an automated question answering system. This proposed system answers the queries posted by the student in a more interactive way like a virtual teacher (chatbot system). The Q&A knowledge base can be accessed and modified by the instructor who could also know the areas where the students are more prone to doubts thus helping the student as well as the instructor. © 2012 IEEE.

关键词： Students

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A role-based administration model for attributes

A role-based administration model for attributes

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1st International Workshop on Secure and Resilient Architectures and Systems, SRAS 2012 - Held in Conjunction with the 21st International Conference on Parallel Architectures and Compilation Techniques, PACT 2012

作者： Jin, Xin Krishnan, Ram Sandhu, Ravi Institute for Cyber Security Dept. of Computer Science Univ. of Texas at San Antonio San Antonio TX United States Institute for Cyber Security Dept. of Electrical and Computer Engineering Univ. of Texas at San Antonio San Antonio TX United States

ISBN: (纸本)9781450317771

Attribute based access control (ABAC) provides flexibility and scalability for securely managing access to resources, particularly in distributed environments. In ABAC, access requests are authorized through policies evaluated with respect to attributes of various entities such as users, subjects, objects, context, etc. Administration of user attributes is one of the major issues in ABAC. However, there has been little research in this area. This paper proposes a framework to administer user attributes using role based access control (RBAC). Our motivation is that RBAC has demonstrated advantages in ease of administration and is widely deployed in the industry. Thus, an appealing possibility is to use RBAC to manage user attributes. In this paper we propose a generalized version of the user role assignment model in the ARBAC97 administrative role based access control model. The generalized version treats role as just one possible attribute of the user. The paper explores the model's advantages and limitations and provides guidance for future development of more comprehensive user attribute administrative models. © 2012 ACM.

关键词： Access control

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Malware classification method via binary content comparison 12

Malware classification method via binary content comparison

引用

2012 ACM Research in Applied Computation Symposium, RACS 2012

作者： Kang, Boojoong Kim, Taekeun Kwon, Heejun Choi, Yangseo Im, Eul Gyu Dept. of Electronics and Computer Engineering Hanyang University Seoul Korea Republic of Cyber Convergence Security Research Division ETRI Daejeon Korea Republic of Div. of Computer Science and Engineering Hanyang University Seoul Korea Republic of

ISBN: (纸本)9781450314923

With the wide spread uses of the Internet, the number of Internet attacks keeps increasing, and malware is the main cause of most Internet attacks. Malware is used by attackers to infect normal users' computers and to acquire private information as well as to attack other machines. The number of new malware and variants of malware is increasing every year because the automated tools allow attackers to generate the new malware or their variants easily. Therefore, performance improvement of the malware analysis is critical to prevent malware from spreading rapidly and to mitigate damages to users. In this paper, we proposed a new malware classification method by analyzing similarities of malware. Our method analyzes a small part of malware to reduce analysis overheads, and experimental results showed that our approach can effectively classify malware families. Copyright 2012 ACM.

关键词： Malware

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Towards provenance and risk-awareness in social computing

Towards provenance and risk-awareness in social computing

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作者： Cheng, Yuan Nguyen, Dang Bijon, Khalid Krishnan, Ram Park, Jaehong Sandhu, Ravi Department of Computer Science University of Texas San Antonio TX United States Department of Electrical and Computer Engineering University of Texas San Antonio TX United States Institute for Cyber Security University of Texas San Antonio TX United States

ISBN: (纸本)9781450317771

Although social computing (SC) has been growing phenomenally, it still lacks an appropriate way of protecting the security and privacy of data shared in the system. Current access control mechanisms in the domain of SC mainly rely on pre-defined access control policies to achieve authorization statically, which are intrinsically unsuitable for capturing the dynamic changes in social environment. In this paper, we explore the approach towards a more flexible and adaptive control through the incorporation of risk awareness in SC. In particular, risk values are associated with users and objects;meanwhile, risk thresholds are defined for each of the permissions. Risk values and risk thresholds can be derived from provenance data in a timely manner. Such dynamic computation can be enabled and facilitated with the incorporation of provenance awareness in SC systems. © 2012 ACM.

关键词： Risk perception

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Practical firewall policy inspection using anomaly detection and its visualization

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International Conference on IT Convergence and security 2011, ICITCS 2011

作者： Kim, Ui-Hyong Kang, Jung-Min Lee, Jae-Sung Kim, Hyong-Shik Department of Computer Science and Engineering Chungnam University 79 Daehak-ro Yuseong-gu Daejeon 305-764 Korea Republic of Computer Science Education Korea University Anam-dong 5-ga Seongbuk-gu Seoul 136-701 Korea Republic of Cyber Security Research Department Attached Institute of ETRI P.O. Box 1 Yuseong Daejeon 305-600 Korea Republic of

ISBN: (纸本)9789400729100

Due to the increasing cyber threats, firewall has become the one of the core elements in network security. The effectiveness of firewall security is dependent on providing policy management techniques. For this reason, it is highly required to have an automatic tool that is real applicable to running firewalls and it should help administrator use in easy. This paper represents a first step toward a practically applicable tool called Firewall Policy Checker for firewall policy inspection based on four anomaly types. It also focuses on detecting dangerous services such as telnet, ftp and so on which many different administrators set as time goes and detecting illegal servers. This tool also supports a large number of rules with the high speed using efficient N-ary tree module. The experimental results using real organizations' rules are introduced. Finally, this paper illustrates an easy visualization even for non-security administrators.

关键词： Visualization

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