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HMM-based Trust Model

HMM-based Trust Model
HMM-based Trust Model
Probabilistic trust has been adopted as an approach to taking security sensitive decisions in modern global computing environments. Existing probabilistic trust frameworks either assume fixed behaviour for the principals or incorporate the notion of 'decay' as an ad hoc approach to cope with their dynamic behaviour. Using Hidden Markov Models (HMMs) for both modelling and approximating the behaviours of principals, we introduce the HMM-based trust model as a new approach to evaluating trust in systems exhibiting dynamic behaviour. This model avoids the fixed behaviour assumption which is considered the major limitation of existing Beta trust model. We show the consistency of the HMM-based trust model and contrast it against the well known Beta trust model with the decay principle in terms of the estimation precision.
21-35
ElSalamouny, Ehab
52fa2c12-75b4-4b7c-9dae-aea451460a0a
Sassone, Vladimiro
df7d3c83-2aa0-4571-be94-9473b07b03e7
Nielsen, Mogens
9d7d7c43-53d6-46bb-8b9c-b54c901349b7
ElSalamouny, Ehab
52fa2c12-75b4-4b7c-9dae-aea451460a0a
Sassone, Vladimiro
df7d3c83-2aa0-4571-be94-9473b07b03e7
Nielsen, Mogens
9d7d7c43-53d6-46bb-8b9c-b54c901349b7

ElSalamouny, Ehab, Sassone, Vladimiro and Nielsen, Mogens (2009) HMM-based Trust Model. International Workshop on Formal Aspects in Security and Trust (FAST2009), , Eindhoven, Netherlands. 05 - 06 Nov 2009. pp. 21-35 . (Submitted)

Record type: Conference or Workshop Item (Paper)

Abstract

Probabilistic trust has been adopted as an approach to taking security sensitive decisions in modern global computing environments. Existing probabilistic trust frameworks either assume fixed behaviour for the principals or incorporate the notion of 'decay' as an ad hoc approach to cope with their dynamic behaviour. Using Hidden Markov Models (HMMs) for both modelling and approximating the behaviours of principals, we introduce the HMM-based trust model as a new approach to evaluating trust in systems exhibiting dynamic behaviour. This model avoids the fixed behaviour assumption which is considered the major limitation of existing Beta trust model. We show the consistency of the HMM-based trust model and contrast it against the well known Beta trust model with the decay principle in terms of the estimation precision.

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More information

Submitted date: 24 July 2009
Venue - Dates: International Workshop on Formal Aspects in Security and Trust (FAST2009), , Eindhoven, Netherlands, 2009-11-05 - 2009-11-06
Organisations: Web & Internet Science

Identifiers

Local EPrints ID: 267669
URI: http://eprints.soton.ac.uk/id/eprint/267669
PURE UUID: 7407aadc-a7ed-4113-8cd1-be182c49c2dc

Catalogue record

Date deposited: 12 Nov 2009 14:26
Last modified: 14 Mar 2024 08:55

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Contributors

Author: Ehab ElSalamouny
Author: Vladimiro Sassone
Author: Mogens Nielsen

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