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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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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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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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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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Session details: access control Policies and Specifications 02

Session details: Access Control Policies and Specifications

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

作者： Morris Sloman Imperial College

No abstract available.

ISBN: (纸本)9781581134964

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A scenario-driven role engineering process for functional RBAC roles 02

A scenario-driven role engineering process for functional RB...

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

作者： Gustaf Neumann Mark Strembeck Vienna University of Economics and BA Austria

ISBN: (纸本)9781581134964

In this paper we present a novel scenario-driven role engineering process for RBAC roles. The scenario concept is of central significance for the presented approach. Due to the strong human factor in role engineering scenarios are a good means to drive the process. We use scenarios to derive permissions and to define tasks. Our approach considers changeability issues and enables the straightforward incorporation of changes into affected models. Finally we discuss the experiences we gained by applying the scenario-driven role engineering process in three case studies.

关键词： scenarios role engineering role-based access control

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Making access control more usable 02

Making access control more usable

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

作者： Elisa Bertino Trent Jaeger Jonathan Moffett Slyvia Osborn Ravi Ravi University of Milano IBM Research University of York Western Ontario George Mason

ISBN: (纸本)9781581134964

Scope: a variety of things are expressed under the heading of access control: permission assignments, constraints, activations, transition, hierarchies, ect. What things really need to be expressed?Concepts: What modeling concepts are available to express these things? Where are we in understanding the usability of these models?Complexity-flexibility tradeoff: How do we make trade-offs between the flexibility of expression (expressive power) and applying more usable concepts? Can this be measured?Domain specificity: Improving ease of use often involves increasing the level of the specification using domain-specific techniques. What techniques are possible? How can we compare teh effectiveness of these techniques?Composition: How can the modularity of access control policies be leveraged? Is there any modularity?Completeness: How do we integrate access control effectively with support for audit and intrusion detection?

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