%0 Journal Article %T Building Privacy-Preserving C4.5 Decision Tree Classifier on Multi-Parties %A Alka Gangrade %A Ravindra Patel %J International Journal on Computer Science and Engineering %D 2009 %I Engg Journals Publications %X In this paper, we address Privacy-preserving classification problem in a multi-party sense. We focus the general classification in a secured manner and introduce a Privacy-preserving decision tree classifier using C4.5 algorithm without involving third party. C4.5 algorithm is a software extension of the basic ID3 algorithm designed by Quinlan. Our protocol is considerably more efficient than any existing solutions. %K Decision tree classification %K C4.5 algorithm %K Privacy-preserving. %U http://www.enggjournals.com/ijcse/doc/IJCSE09-01-03-16.pdf