Collaborative classification mechanism for privacy-preserving

Zhancheng Zhang, Shitong Wang, Fu Lai Korris Chung

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)


Privacy-preserving is becoming an increasingly important task in the Web-enabled world. Specifically we propose a novel two-party privacy-preserving classification solution called collaborative classification mechanism for Privacy-preserving(C2MP2) that is inspired from mean value and covariance matrix globally stating data location and direction, and the fact that sharing those global information with others will not disclose ones own privacy. This model collaboratively trains the decision boundary from two hyper-planes individually constructed by ones own privacy information and counter-party's global information. As a major contribution, we show that C2MP2 can protect both data-entries and number of entries. We describe the C2MP2 model definition, provide the geometrical interpretation, and present theoretical justifications. To guarantee the security of testing procedure, we then develop a testing algorithm based on homomorphic encryption scheme. Moreover, we show that C2MP2 can be transformed into existing minimax probability machine (MPM), support vector machine (SVM) and maxi-min margin machine (M4) model when privacy data satisfies certain conditions. We also extend C2MP2 to a nonlinear classifier by exploiting kernel trick without privacy disclosure. Furthermore, we perform a series of evaluations on both toy data sets and real-world benchmark data sets. Comparison with MPM and SVM demonstrates the advantages of our new model in protecting privacy.
Original languageEnglish
Pages (from-to)1018-1028
Number of pages11
JournalJisuanji Yanjiu yu Fazhan/Computer Research and Development
Issue number6
Publication statusPublished - 1 Jun 2011


  • Classification
  • Collaborative learning
  • Privacy-preserving
  • Secure two-party computation
  • SVM

ASJC Scopus subject areas

  • Software
  • Hardware and Architecture
  • Computer Networks and Communications


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