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Wireless Communications and Mobile Computing
Volume 2017, Article ID 1457870, 9 pages
Research Article

CPSFS: A Credible Personalized Spam Filtering Scheme by Crowdsourcing

1College of Computer & Communication Engineering China University of Petroleum (East China), Qingdao, China
2University of Oulu, Oulu, Finland

Correspondence should be addressed to Xin Liu; nc.ude.cpu@xl

Received 12 September 2017; Accepted 5 December 2017; Published 27 December 2017

Academic Editor: Kuan Zhang

Copyright © 2017 Xin Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Email spam consumes a lot of network resources and threatens many systems because of its unwanted or malicious content. Most existing spam filters only target complete-spam but ignore semispam. This paper proposes a novel and comprehensive CPSFS scheme: Credible Personalized Spam Filtering Scheme, which classifies spam into two categories: complete-spam and semispam, and targets filtering both kinds of spam. Complete-spam is always spam for all users; semispam is an email identified as spam by some users and as regular email by other users. Most existing spam filters target complete-spam but ignore semispam. In CPSFS, Bayesian filtering is deployed at email servers to identify complete-spam, while semispam is identified at client side by crowdsourcing. An email user client can distinguish junk from legitimate emails according to spam reports from credible contacts with the similar interests. Social trust and interest similarity between users and their contacts are calculated so that spam reports are more accurately targeted to similar users. The experimental results show that the proposed CPSFS can improve the accuracy rate of distinguishing spam from legitimate emails compared with that of Bayesian filter alone.