Abstract

Abstract — Cloud provides data storage and sharing services and people works together as a group. After creating the group, member of a group able to access, modify and shares latest updated data with the rest of the group members. To sure the integrity, group member need to upload the data with their sign. After modification user have to upload data with his own private key. If user is repudiated from group then data signed by repudiated user are signed by existing users. In this, proposed an auditing mechanism for integrity of shared data with efficient user repudiation. Existing user resign the data during user repudiation without downloading data. Keywords—Diverge auditing, shared data, user repudiation, cloud computing.