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7 篇 会议

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A logic for state transformations in authorization policies 10

A logic for state transformations in authorization policies

引用

10th Computer Security Foundations Workshop

作者： Bai, Y Varadharajan, V Distributed System and Network Security Research Unit Dept. of Computing University of W. Sydney Australia

ISBN: (纸本)0818679913

In a multi-user information-sharing system, authorization policy provides the ability to limit and control access to system, applications and information. In the real world, an authorization policy has temporal properties. That is, it needs to be updated to capture the changing requirements of applications, systems and users. These updates are implemented via transformation of authorization policies. In this paper we propose a logic based approach to specify and to reason about state transformations in authorization policies. The authorization policy is specified using a policy base which comprises a finite set of facts and access constraints. We define the structure of the policy transformation and employ a model-based semantics to perform the transformation under the principle of minimal change. Furthermore, we extend model-based semantics by introducing preference ordering to resolve possible conflicts during transformation of policies. We also discuss the implementation of the model based transformation approach and outline the relevant algorithms.

关键词： Semantics

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A new efficient off-line anonymous cash scheme 8th

引用

8th Annual International Symposium on Algorithms and Computation, ISAAC 1997

作者： Nguyen, Khanh Quoc Varadharajan, Vijay Mu, Yi Distributed System and Network Research Unit Department of Computing University of Western Sydney PO Box 10 KingswoodNSW2747 Australia

ISBN: (纸本)3540638903

Current off-fine electronic cash systems require at least one interaction between the client and the vendor for each coin. We propose a new electronic cash scheme that requires only one interaction between the client and the vendor for a complete electronic transaction. Our new protocol provides unconditional client anonymity, double-spending detection and forgery-prevention. © Springer-Verlag Berlin Heidelberg 1997.

关键词： Electronic money

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A logic for state transformations in authorization policies

A logic for state transformations in authorization policies

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Computer Security Foundations Workshop

作者： Yun Bai V. Varadharajan Distributed System and Network Security Research Unit Department of Computing University of Western Ontario Australia

ISBN: (纸本)0818679905

In a multi-user information-sharing system, an authorization policy provides the ability to limit and control access to system, applications and information. In the real world, an authorization policy has temporal properties. That is, it needs to be updated to capture the changing requirements of applications, systems and users. These updates are implemented via transformations of the authorization policies. In this paper, we propose a logic-based approach to specify and to reason about state transformations in authorization policies. An authorization policy is specified using a policy base which comprises a finite set of facts and access constraints. We define the structure of the policy transformation and employ a model-based semantics to perform the transformation under the principle of minimal change. Furthermore, we extend the model-based semantics by introducing preference ordering to resolve possible conflicts during the transformation of policies. We also discuss the implementation of the model-based transformation approach and outline the relevant algorithms.

关键词： Logic Authorization Permission Control systems Intelligent networks Information security Computer networks distributed computing Australia Mechanical factors

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Security services and public key infrastructure for ATM networks

Security services and public key infrastructure for ATM netw...

引用

Conference on Local Computer networks (LCN)

作者： V. Varadharajan R. Shankaran M. Hitchens Distributed System and Network Security Research Unit Department of Computing University of Sydney NSW Australia Computer Science Department University of Sydney Australia Distributed System and Network Security Research Unit University of West Sydney Nepean Canada

The paper addresses the design of security services for ATM networks. First various options for the placement of security services within the ATM protocol stack are outlined. Then a security layer between the AAL and ATM layer is considered. The proposed security layer provides confidentiality, integrity and data origin authentication in the user plane. The paper then presents an authentication scheme and a key establishment protocol. This protocol is integrated with the existing ATM signaling protocol, as part of the call setup procedures. The authors also consider the design of protocols between ATM nodes and Certification Authority for initializing retrieving and distributing public key certificates. The developed security design can be transparently integrated into the B-ISDN Protocol Reference Model without violating the existing standards.

关键词： Public key Asynchronous transfer mode Protocols Data security Authentication Computer security Computer networks Australia Application software Communication switching

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Security for ATM networks

Security for ATM networks

引用

IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： V. Varadharajan R. Shankaran Distributed System and Network Security Research Unit Department of Computing University of Western Ontario Kingswood NSW Australia

This paper addresses the design and management of security services for ATM networks. Various options for the positioning of security services within the ATM protocol stack are discussed. After considering these possibilities, it is proposed to place the security layer between the AAL and ATM layers. The proposed security layer provides confidentiality, integrity and data origin authentication in the user plane. The paper then presents an authentication scheme and a key establishment protocol. This protocol is integrated with the existing ATM signaling protocol, as part of the call setup procedures. The developed security design can be transparently integrated into the B-ISDN protocol reference model without violating the existing standards.

关键词： Asynchronous transfer mode Protocols Data security Computer network management Authentication Computer security Application software Information security Physical layer Computer networks

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On the design of secure electronic payment schemes for Internet 12

On the design of secure electronic payment schemes for Inter...

引用

12th Annual Computer Security Applications Conference, ACSAC 1996

作者： Varadharajan, V. Mu, Yi Distributed System and Network Security Research Unit University of W. Sydney Nepean PO Box 10 KingswoodNSW2747 Australia

ISBN: (纸本)081867606X

Considers the design of secure electronic credit card based payment schemes for the Internet, and reveals some of the issues that have not been adequately addressed in the proposed protocols to date. This paper proposes additional mechanisms that need to be incorporated as part of the design phase of the scheme to deal efficiently with the disputes that can arise. The design methods described in this paper are applicable to a range of protocols, including iKP (Internet Kaufmannisch Protokoll), STT (Secure Transaction Technology) and SEPP (Secure Electronic Payment Protocol). Based on this discussion, the paper goes on to propose an improved payment scheme and protocol. The new protocol, referred to as the permission-based payment (PBP) protocol, provides a fair treatment of both the client and the merchant involved in the transaction. It separates the purchase request phase from the payment phase, thereby increasing the ability to handle certain class of disputes more efficiently. It removes the need to store the secret private key at the client's machine or the need for a smart card device. This is important as one cannot assume that all the clients connected to the Internet have smart card readers attached to them. The new protocol makes simpler assumptions about the environment, thereby making the scheme practical for securing commercial electronic credit card transactions. © 1996 IEEE.

关键词： Smart cards

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On the design of secure electronic payment schemes for Internet

On the design of secure electronic payment schemes for Inter...

引用

Annual Computer Security Applications Conference

作者： V. Varadharajan Yi Mu Distributed System and Network Security Research Unit University of Western Ontario Kingswood NSW Australia

关键词： Protocols Consumer electronics IP networks Web and internet services Credit cards Australia Explosions Electronic commerce Explosives Information security

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