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检索条件"任意字段=Proceedings of Seventh ACM Symposium on Access Control Models and Technologies: SACMAT 2002"

共 48 条记录，以下是31-40 订阅

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Role-based access control for collaborative enterprise in Peer-to-Peer computing environments 03

Role-based access control for collaborative enterprise in Pe...

引用

proceedings of Eighth acm symposium on access control models and technologies

作者： Park, Joon S. Hwang, Junseok School of Information Studies Syracuse University Syracuse NY 13244-4100 United States

ISBN: (纸本)9781581136814

In Peer-to-Peer (P2P) computing environments, each participant (peer) acts as both client and content provider. This satisfies the requirement that resources should be increasingly made available by being published to other users from a user's machine. Compared with services performed by the client-server model, P2P-based services have several advantages. However, wide-scale application of P2P computing is constrained by limitations associated with the especially sophisticated control mechanisms needed between peers. To overcome these limitations, we introduce a controlled P2P computing architecture by extending the concept of Web services to the peer-to-peer level through a generic middleware. Specifically, in this paper we tailor our approach to support RBAC. Although our approach supports both brokered and purist P2P models, all of the policy decisions can be made on the peer side, because policy information is transferred from the policy servers to the corresponding peers through metadata that peers can understand. Each peer makes the access control decision based on the enterprise, the community, and the peer policies without asking other components. This approach supports RBAC services for collaborative enterprise in P2P computing environments, not only within one community but also within inter-communities. Furthermore, it also supports peers' autonomous decisions without causing policy conflicts. The broad dissemination of our approach would enable P2P technology to be applicable to more reliable and efficient services, providing controlled communications between peers.

关键词： Security of data

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The PERMIS X.509 role based privilege management infrastructure 02

The PERMIS X.509 role based privilege management infrastruct...

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TERENA Networking Conference 2002

作者： Chadwick, DW Otenko, A Univ Salford IS Inst Manchester M5 4WT Lancs England

ISBN: (纸本)9781581134964

This paper describes the EC PERMIS project, which has developed a role based access control infrastructure that uses X.509 attribute certificates (ACs) to store the users' roles. All access control decisions are driven by an authorisation policy, which is itself stored in an X.509 AC, thus guaranteeing its integrity. All the ACs can be stored in one or more LDAP directories, thus making them widely available. Authorisation policies are written in XML according to a DTD that has been published at ***. The access control Decision Function (ADF) is written in Java and the Java API is simple to use, comprising of just three methods and a constructor. There is also a Privilege Allocator, which is a tool that constructs and signs ACs and stores them in an LDAP directory for subsequent use by the ADF (C) 2002 Elsevier Science B.V. All rights reserved.

关键词： trust management X.509 attribute certificates role based access controls XML privilege management infrastructure

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A lightweight approach to specification and analysis of role-based access control extensions 02

A lightweight approach to specification and analysis of role...

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proceedings of seventh acm symposium on access control models and technologies: sacmat 2002

作者： Schaad, Andreas Moffett, Jonathan D. Department of Computer Science University of York York United Kingdom

ISBN: (纸本)9781581134964

Role-based access control is a powerful and policy-neutral concept for enforcing access control. Many extensions have been proposed, the most significant of which are the decentralised administration of role-based systems and the enforcement of constraints. However, the simultaneous integration of these extensions can cause conflicts in a later system implementation. We demonstrate how we use the Alloy language for the specification of a conflict-free role-based system. This specification provides us at the same time with a suitable basis for further analysis by the Alloy constraint analyser.

关键词： High level languages

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models for coalition-based access control (CBAC) 02

Models for coalition-based access control (CBAC)

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proceedings of seventh acm symposium on access control models and technologies: sacmat 2002

作者： Cohen, Eve Thomas, Roshan K. Winsborough, William Shands, Deborah NAI Labs Network Associates Inc. 3415 S. Sepulveda Bld Suite 700 Los Angeles CA 90034 United States NAI Labs Network Associates Inc. 1145 Herndon Parkway Suite 500 Herndon VA 20170 United States NAI Labs Network Associates Inc. 3060 Washington Road Glenwood MD 21738 United States

ISBN: (纸本)9781581134964

To effectively participate in modern coalitions, member organizations must be able to share specific data and functionality with coalition partners, while ensuring that their resources are safe from inappropriate access. This requires access control models, policies, and enforcement mechanisms for coalition resources. This paper describes a family of coalition-based access control (CBAC) models, developed to provide a range of expressivity with an accompanying range of implementation complexity. We define the protection state of a system, which provides the semantics of CBAC-based access policies. Finally, we briefly examine some of the issues for coalition access policy development and administration, and the complexity of implementing access enforcement mechanisms in a coalition environment.

关键词： Security of data

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Managing access control policies using access control spaces 02

Managing access control policies using access control spaces

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proceedings of seventh acm symposium on access control models and technologies: sacmat 2002

作者： Jaeger, Trent Edwards, Antony Zhang, Xiaolan IBM T.J. Watson Research Center Hawthorne NY 10532 United States

ISBN: (纸本)9781581134964

We present the concept of an access control space and investigate how it may be useful in managing access control policies. An access control space represents the permission assignment state of a subject. We identify subspaces that have meaningful semantics. For example, the set permissions explicitly assigned to a subject defines its specified subspace, and constraints define the prohibited subspace. In analyzing these subspaces, we identify two problems: (1) often a significant portion of the access control space has unknown assignment semantics, meaning that it is not defined whether an assignment in this space should be permitted or not, and (2) often high-level assignments and constraints that are easily understood result in conflicts where permissions are both specified and prohibited. To solve these problems, we have developed a tool, called Gokyo, that enables definition and analysis of access control spaces. Gokyo computes the unknown subspace to show system administrators the ambiguous region and enable them to reduce it. Gokyo identifies conflicting subspaces and enables system administrators to handle subspaces as exceptions, if desired. We demonstrate the utility of Gokyo by analyzing a web server policy example.

关键词： Computer aided software engineering

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proceedings of seventh acm symposium on access control models and technologies: sacmat 2002

作者： Wilikens, Marc Feriti, Simone Sanna, Alberto Masera, Marcelo Italy Sci. Inst. Hospital San Raffaele Via Olgettina 60 20132 Milan Italy

ISBN: (纸本)9781581134964

This paper describes an application of authorization and access control based on the Role Based access control (RBAC) method and integrated in a comprehensive trust infrastructure of a health care application. The method is applied to a health care business process that involves multiple actors accessing data and resources needed for performing clinical and logistics tasks in the application. The notion of trust constituency is introduced as a concept for describing the context of authorisation. In addition, the applied RBAC covers time constraints, hierarchies and multi-level authorization rules for coping with the multi-actor nature and the complexity of the application domain. The DRIVE RBAC model clearly distinguishes between static role assignment to users and dynamic allocation of roles at session time. The paper, while focusing on the authorization and access control approach, also describes how the RBAC functions have been integrated in a trust infrastructure including smart cards.

关键词： Security of data

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A cryptographic solution to implement access control in a hierarchy and more

A cryptographic solution to implement access control in a hi...

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proceedings of seventh acm symposium on access control models and technologies: sacmat 2002

作者： Ray, Indrakshi Ray, Indrajit Narasimhamurthi, Natu CS Department Colorado State University Fort Collins CO 80523 United States ECE Department Univ. of Michigan Dearborn Dearborn MI 48128 United States

The need for access control in a hierarchy arises in several different contexts. One such context is managing the information of an organization where the users are divided into different security classes depending on who has access to what. Several cryptographic solutions have been proposed to address this problem - the solutions are based on generating cryptographic keys for each security class such that the key for a lower level security class depends on the key for the security class that is higher up in the hierarchy. Most solutions use complex cryptographic techniques: integrating these into existing systems may not be trivial. Others have impractical requirement: if a user at a security level wants to access data at lower levels, then all intermediate nodes must be traversed. More-over, if there is an access control policy that does not conform to the hierarchical structure, such policy cannot be handled by existing solutions. We propose a new solution that overcomes the above mentioned shortcomings. Our solution not only addresses the problem of access control in a hierarchy but also can be used for general cases. It is a scheme similar to the RSA cryptosystem and can be easily incorporated in existing systems.

关键词： Public key cryptography

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An access control language for web services 02

An access control language for web services

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proceedings of seventh acm symposium on access control models and technologies: sacmat 2002

作者： Sirer, Emin Gün Wang, Ke Computer Science Department Cornell University Ithaca NY 14853 United States

ISBN: (纸本)9781581134964

This paper presents an approach for formally specifying and enforcing security policies on web service implementations. Networked services in general, and web services in particular, require extensive amounts of code to ensure that clients respect site-integrity constraints. We provide a language by which these constraints can be expressed and enforced automatically, portably and efficiently. Security policies in our system are specified in a language based on temporal logic, and are processed by an enforcement engine to yield site and platform-specific access control code. This code is integrated with a web server and platform-specific libraries to enforce the specified policy on a given web service. Our approach decouples the security policy specification from service implementations, provides a mandatory access control model for web services, and achieves good performance. We show that up to 22% of the code in a traditional web service module is dedicated to security checking functionality, including checks for client sequencing and parameter validation. We show that our prototype language implementation, WebGuard, enables web programmers to significantly reduce the amount of security checking code they need to develop manually. The quality of the code generated by WebGuard from formal policy specifications is competitive with the latency of handcrafted code to within a few percent.

关键词： Computer programming languages

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Towards usage control models: Beyond traditional access control

Towards usage control models: Beyond traditional access cont...

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proceedings of seventh acm symposium on access control models and technologies: sacmat 2002

作者： Park, Jaehong Sandhu, Ravi Lab. for Info. Security Technol. George Mason University 4400 University Dr. Fairfax VA 22030 United States *** Inc. George Mason University 11417 Sunset Hills Road Reston VA 20190 United States

In this paper we develop the concept of Usage control (UCON) that encompasses traditional access control, trust management, and digital rights management and goes beyond them in its definition and scope. While usage control concepts have been mentioned off and on in the security literature for some time, there has been no systematic treatment so far. By unifying these three areas UCON offers a promising approach for the next generation of access control. Traditional access control has focused on a closed system where all users are known and primarily utilizes a server-side reference monitor within the system. Trust management has been introduced to cover authorization for strangers in an open environment such as the Internet. Digital rights management has dealt with client-side control of digital information usage. Each of these areas is motivated by its own target problems. Innovations in information technology and business models are creating new security and privacy issues which require elements of all three areas. To deal with these in a systematic unified manner we propose the new UCON model. UCON enables finer-grained control over usage of digital objects than that of traditional access control policies and models. For example, print once as opposed to unlimited prints. Unlike traditional access control or trust management, it covers both centrally controllable environment and an environment where central control authority is not available. UCON also deals with privacy issues in both commercial and non- commercial environments. In this paper we first discuss access control, trust management, and digital rights management and describe general concepts of UCON in the information security discipline. Then we define components of the UCON model and discuss how authorizations and access controls can be applied in the UCON model. Next we demonstrate some applications of the UCON model and develop further details. We use several examples during these discussions to s

关键词： Security of data

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Session details: access control Management and models 02

Session details: Access Control Management and Models

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proceedings of the seventh acm symposium on access control models and technologies

作者： Michael Bret Naval Postgraduate School

No abstract available.

ISBN: (纸本)9781581134964

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