A Representation Model of Trust Relationships with Delegation Extensions

Agudo, Isaac; López, Javier; Montenegro, José Antonio

doi:10.1007/11429760_9

Cited by 12 publications

(16 citation statements)

References 3 publications

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“…We define the type of credential to include all the properties that are not essential, but which are helpful, to define Authorization and Delegation. This separation of concepts was previously proposed in [1], but we extend it here to include more general information, in particular, information regarding the context.…”

Section: Typementioning

confidence: 97%

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Attribute Delegation Based on Ontologies and Context Information

Agudo

López

Montenegro

2006

Communications and Multimedia Security

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Abstract. This paper presents a model for delegation based on partial orders, proposing the subclass relation in OWL as a way to represent the partial orders. Delegation and authorization decisions are made based on the context. In order to interact with the context, we define the Type of a credential as a way to introduce extra information regarding context constraints. When reasoning about delegation and authorization relationships, our model benefits from partial orders, defining them over entities, attributes and the credential type. Using these partial orders, the number of credentials required is reduced. It also classifies the possible criteria for making authorization decisions based on the context, in relation to the necessary information.

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Section: Typementioning

confidence: 97%

“…Suppose we have a credential with type [0, 5], then we could derive new credentials with a lower type, e.g. [1,4].…”

Section: Typementioning

confidence: 99%

Attribute Delegation Based on Ontologies and Context Information

Agudo

López

Montenegro

2006

Communications and Multimedia Security

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“…It is a number in the interval [0,1]. A credential with weight zero is equivalent to a null credential.…”

Section: Weighted Trust Graphmentioning

confidence: 99%

“…Those metrics help us to measure the relative authorization power of different paths. It only uses monotone metrics (for motivation, see [1]). Some examples of metrics are:…”

Section: Weighted Trust Graphmentioning

confidence: 99%

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Graphical Representation of Authorization Policies for Weighted Credentials

Agudo

López

Montenegro

2006

Information Security and Privacy

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Abstract. This paper elaborates on a solution to represent authorization and delegation in a graphical way, allowing users to better interpret delegation relationships. We make use of Weighted Trust Graph (WTG) as an instrument to represent delegation and authorization, extending it to cope with more complicated concepts, and providing a graphical representation of the level of confidence that exists between two entities regarding a resource or attribute. We represent the level of confidence for each pair of entities as a point in an axis diagram, as a set of points, or as a set of triangular regions depending on the accuracy we need. Then, we use the same diagram to represent the set of acceptable confidence level, that we call authorization policy set. In this way, a single diagram can be used to decide about authorization, thus providing a powerful tool for systems in which interaction of users is needed.

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Computing of Trust in Ad-Hoc Networks

Zhu

Bao

Liu

2006

Communications and Multimedia Security

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Although, the notion of trust has been considered as a primitive for establishing relationships among nodes in ad-hoc networks, syntax and metrics of trust are not well defined. This paper studies computing of trust in ad-hoc networks and makes the following three contributions. Firstly, the notion of trust is formalized in terms of predict functions and strategy functions. Namely, the notion of trust in this paper is defined as a predict function that can be further evaluated by a strategy function for a pre-described action; Secondly, structures of trust are formalized as a map between a path in the underlying network graph and the corresponding edge of its transitive closure graph; Thirdly, a generic model for computing of trust in the small world is proposed.

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A Representation Model of Trust Relationships with Delegation Extensions

Cited by 12 publications

References 3 publications

Attribute Delegation Based on Ontologies and Context Information

Attribute Delegation Based on Ontologies and Context Information

Graphical Representation of Authorization Policies for Weighted Credentials

Computing of Trust in Ad-Hoc Networks

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