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Title: Collusion-resistant spatial phenomena crowdsourcing via mixture of Gaussian Processes regression
Authors: Zhang, Jie
Xiang, Qikun
Nevat, Ido
Zhang, Pengfei
Keywords: Crowdsourcing
DRNTU::Engineering::Computer science and engineering
Issue Date: 2016
Source: Xiang, Q., Nevat, I., Zhang, P. & Zhang, J. (2016). Collusion-resistant spatial phenomena crowdsourcing via mixture of Gaussian Processes regression. 18th International Workshop on Trust in Agent Societies, 1578, 19-30.
Conference: 18th International Workshop on Trust in Agent Societies
Abstract: With the rapid development of mobile devices, spatial location-based crowdsourcing applications have attracted much attention. These applications also introduce new security risks due to untrustworthy data sources. In the context of crowdsourcing applications for spatial interpolation (i.e. spatial regression) using crowdsourced data, the results can be seriously affected if malicious data sources initiate a colluding (collaborate) attacks which purposely alter some of the measurements. To combat this serious detrimental effect, and to mitigate such attacks, we develop a robust version via a Gaussian Process mixture model and develop a computationally efficient algorithm which utilises a Markov chain Monte Carlo (MCMC)-based methodology to produce an accurate predictive inference in the presence of collusion attacks. The algorithm is fully Bayesian and produces posterior predictive distribution for any point-of-interest in the input space. It also assesses the trustworthiness of each worker, i.e. the probability of each worker being honest (trustworthy). Simulation results demonstrate the accuracy of this algorithm.
Schools: School of Computer Science and Engineering 
Rights: © 2016 The Author(s). All rights reserved. This paper was published by CUER Workshop Proceedings in18th International Workshop on Trust in Agent Societies and is made available with permission of The Author(s).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SCSE Conference Papers

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