Abstract: Privacy protection in cloud computing environment has become the key to the rapid development of cloud computing,until now more researches focus on the explicit protection methods of privacy protection such as encryption,lacking of enough attention to implicit attack,such as data mining attack.A protection model was established in this paper according to how to protect privacy in cloud computing environment against data mining attack.The model selects several key objectives as the key protection during the life cycle of user’s data,including input,storage,reduction and destruction.Then correlative modules were established according to the key objectives corresponding to data privacy.Finally,the effectiveness of this model was proved through the complexity comparison.

Key words: Cloud computing,Data mining,Privacy protection,Implicit attack