Outsourcing data integrity auditing method and device, equipment and medium

The invention relates to an outsourcing data integrity auditing method and device, equipment and a medium, and the method comprises the steps: encrypting a plaintext data block of file data to obtain a ciphertext before a data owner uploads the file data, and calculating and determining an authentication tag and a signature value of the file data according to a system global parameter, a hash value of the file data and the ciphertext of the file data, sending the ciphertext data set, the authentication tag set and the signature value of the file data to a cloud server for storage; before the cloud storage server stores the data, the cloud server verifies the relevance between a ciphertext data set and an authentication label set of the file data, generates a challenge data set under the assistance of an intelligent contract, calculates a data integrity proof of the file data, and stores an audit record of the file data; and the data owner determines a final audit result according to the data integrity proof a