A Data Sharing Protocol to Minimize Security and Privacy Risks of Cloud Storage in Big Data Era

The big data cloud system uses the storage of cloud service providers to distribute data to legitimate users. Compared to traditional solutions, cloud providers store shared data in large data centers outside the trusted area of the data owner, which can provide data protection. Secret Group Key (SSGK) to protect public data and communications from unauthorized access. Unlike previous work, a group key is used to encrypt shared data, and a secret exchange scheme is used to distribute group data. Comprehensive security and performance analysis shows that our protocol significantly reduces security and data protection risks through cloud data exchange and saves about 12% of disk space.