Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

Robust network trust establishment for collaborative applications and protocols

Theodorakopoulos, Georgios 2007. Robust network trust establishment for collaborative applications and protocols. PhD Thesis, University of Maryland, College Park.

Full text not available from this repository.

Abstract

In networks without centralized control (e.g. ad-hoc or peer-to-peer networks) the users cannot always be assumed to follow the protocol that they are supposed to. They will cooperate in the operation of the network to the extent that they achieve their own personal objectives. The decision to cooperate depends on the trust relations that users develop for each other through repeated interactions. Users who have not interacted directly with each other can use direct trust relations, generated by others, in a transitive way as a type of recommendation. Network operation and trust generation can be affected by malicious users, who have different objectives, and against whom any proposed solution needs to be robust. We model the generation of trust relations using repeated games of incomplete information to capture the repetitive operation of the network, as well as the lack of information of each user about the others' objectives. We find equilibria that provide solutions for the legitimate users against which the malicious users cannot improve their gains. The transitive computation of trust is modeled using semiring operators. This algebraic model allows us to generalize various trust computation algorithms. More importantly, we find the maximum distortion that a malicious user can cause to the trust computation by changing the reported trust value of a trust relation.

Item Type: Thesis (PhD)
Date Type: Publication
Status: Unpublished
Schools: Computer Science & Informatics
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Funders: U.S. Army Research Laboratory, U.S. Army Research Office
Related URLs:
Last Modified: 04 Jun 2017 09:13
URI: http://orca.cf.ac.uk/id/eprint/92111

Actions (repository staff only)

Edit Item Edit Item