Author : Miss.Jondhale Dhanashree Rajaram and Prof.Rokade.S.M

In the proposed System users can achieve an effective and economical approach for data sharing among group members in the cloud with characters of low maintenance and little management cost.Proposed system will provide security for the sharing data files since they are outsourced.In existing system the secure key distribution is based on secure point .Dynamic group sharing is a scheme which used in existing system and private keys are shared only within group members. Group members can securely obtain their private key from group Manager.The System can accomplish two factor fine grained access control and also system protect from collusion attack which means user upload the same name of file same group or different group then collusion attack by Name.When User or group manager revoke from dynamic group then group of all member key will compulsory be updated due to point of security also to be a classified member of the group user has to upload at least one file to detect fake users and to maintain data integrity

Keywords: Access Control,  Cloud     Computing, Group Sharing,Key Distribution, Privacy-Preserving