Secure Method for Data Storage and Sharing During Data Outsourcing

Data outsourcing services have emerged with the increasing use of digital information. They can be used to store data via networks and various devices, which are easy to access. Unlike existing removable storage systems, storage outsourcing is available to many users because it has no storage limit and does not require a storage medium. However, the reliability of storage outsourcing has become an important topic because many users employ it to store large volumes of data. To protect against unethical administrators and attackers, a variety of cryptography systems are used, such as searchable encryption and proxy re-encryption. However, existing searchable encryption technology is inconvenient for use in the storage outsourcing environments where users upload their data, which are shared with others as necessary. The users also change frequently. In addition, some existing methods are vulnerable to collusion attacks and have computing cost inefficiencies. In this paper, we propose a secure and efficient method for data storage and sharing during data outsourcing.