Abstract
Cloud computing provides an economical and efficient solution for sharing group resource among cloud users. General sharing schemes protect data confidentiality, and also limit the functionality of the storage system because some operations are supported over encrypted data .Now a day’s sharing doesn’t provide any security. The new proposed scheme is to provide secure multi owner data sharing scheme for dynamic groups in the cloud. Also provide a group signature and dynamic broadcast encryption techniques, any cloud user can anonymously sharing data with others. Meanwhile, to reduce the storage overhead and encryption computation cost. Then cloud service provider blocking the users who are entering wrong authentication keys more than some times