A Secure Encrypted Data Deduplication Scheme Based on Data Popularity Supporting Dynamic Ownership Management
Zhiqiang Wang, Wenjing Gao, Xinliang Li, Rong Hao · 2022
Data deduplication technology can save a lot of storage space for the cloud server. However, how to use data deduplication technology to save storage space while ensuring data security has always been a difficult problem. To find a balance between data deduplication technology and data security, some studies introduce the concept of data popularity. In the encrypted data deduplication scheme based on data popularity, the popular data is encrypted by simple and efficient convergent encryption, and the unpopular data is encrypted by semantically secure symmetric encryption. However, the existing schemes do not consider the problem of dynamic ownership management. If the revoked user obtains the ciphertext of popular data, he/she also can decrypt the ciphertext to obtain the plaintext data. In this paper, we propose a secure encrypted data deduplication scheme supporting dynamic ownership management, which can prevent the revoked user from obtaining plaintext data. We use proxy re-encryption algorithm to encrypt convergent ciphertext which is able to prevent ciphertext data from leaking information of popular data. Besides, we design a proof of ownership protocol to prevent the revoked user from regaining access to the data. In this way, the revoked user will not be able to obtain plaintext data.