This document summarizes a proposed scheme for secure data sharing in dynamic groups in the cloud. It addresses key challenges including how to securely share data with fine-grained access control when group membership changes frequently. The proposed scheme uses key policy attribute-based encryption (KP-ABE) and group signatures to allow any cloud user to anonymously share data. It leverages techniques like dynamic broadcast encryption and signed receipts to reduce computation and storage overhead, making the costs independent of the number of revoked users. The scheme aims to enable secure multi-owner data sharing where attribute authorities are also dynamic.