Group Key Management Protocol for File Sharing on Cloud Storage

The large-scale sharing needs of many enterprises promote the development of cloud storage. While the cloud computing stores the shared files outside the trust domain of the owner, the demands and concerns for file security is arising. In this, a Group Key Management Protocol for file sharing on cloud storage is proposed. Faced with network attacks from public channel, a group key generation scheme based on mixed encryption technology is proposed. And a verification scheme is used to prevent shared files from being attacked by the collusion attack of cloud providers and group members. Security and performance analyses indicate that the proposed protocol is both secure and efficient for data sharing in cloud computing.