Method for supporting safe transfer and verifiable deletion of outsourced data

The invention belongs to the technical field of data processing of cloud storage, and discloses a method for supporting secure transfer and verifiable deletion of outsourcing data, which comprises thefollowing steps: after a ciphertext is outsourced to a cloud server A, a data owner checks a storage result and deletes a local backup of a file; then, in order to enjoy a more appropriate storage service or for objective factors, a data owner changes a cloud storage service provider halfway, migrates outsourcing data from the original cloud server A to the target cloud server B, and checks a transfer result; and finally, when data transfer is completed or a data owner does not need data any more, the cloud server is required to delete the data and check a deletion result. Safety analysis proves that the new scheme provided by the invention can meet the required safety requirement. Finally, simulation experiments show that the new scheme of the invention is very efficient and practical. 本发明属于云存储的数据处理技术领域，公开了一种支持外