This document summarizes a study on privacy preserving data mining techniques. It begins with an abstract that introduces privacy preserving data mining as a technique for analyzing shared data while preserving data sensitivity and privacy. It then reviews literature on recent privacy preserving data mining techniques, including techniques for vertically partitioned databases using homomorphic encryption. The document proposes a new privacy preserving association rule mining model and technique. It concludes that privacy preserving data mining is an important new technique for situations where different parties need to combine data for analysis while preserving privacy.