ISSN 1000-1239 CN 11-1777/TP

• 信息安全 •

### 云存储加密数据去重删除所有权证明方法

1. (西安电子科技大学计算机学院 西安 710071) (chaoyang@mail.xidian.edu.cn)
• 出版日期: 2015-01-01
• 基金资助:
基金项目：国家自然科学基金青年基金项目(61303219,61100230)|国家自然科学基金重点项目(60633020)|中央高校基本科研业务费专项资金项目(K5051303007)|陕西省自然科学基金项目(2014JQ8295)

### Proving Method of Ownership of Encrypted Files in Cloud De-Duplication Deletion

Yang Chao, Zhang Junwei, Dong Xuewen, Ma Jianfeng

1. (School of Computer Science and Technology, Xidian University, Xi’an 710071)
• Online: 2015-01-01

Abstract: Abstract As the rapid adoption of cloud storage services, a new technology of client-side deduplication is proposed to save the bandwidth of uploading copies of existing files to the server. This promising technology, however, has been recently found being vulnerable to a new kind of attack, in which by learning just a small piece of information about the file, namely its Hash value, an attacker is able to get the entire file from the server. To solve the problems mentioned above, we propose a cryptographically secure and efficient scheme to support cross-user client side deduplication over encrypted file. The new scheme utilizes the technique of spot checking in which the client only need to access small portions of the original file, dynamic coefficients, randomly chosen indices of the original files and a subtle approach to distribute the file encrypting key among clients to satisfy security requirements. Extensive security analysis shows that the proposed scheme can generate provable ownership of the encrypted file (POEF) with the presence of the curious server, and maintain a high detection probability of the client misbehavior. Both performance analysis and simulation results demonstrate that our proposed scheme is much more efficient than the existing schemes, especially in reducing the burden of the client.