File Hierarchy Attribute Based Encryption Scheme in Cloud Computing

Computer Engineering

To solve the issue of secure data sharing in cloud computing, Cipher-text policy attribute based encryption (CP-ABE) has been preferred encryption method. The shared data files in most cases have the features of multilevel hierarchy, specifically in the area of healthcare and the military. However, the hierarchy system of shared files has not been explored in CP-ABE. In this paper, an effective file hierarchy attribute-based encryption method is proposed in cloud computing. The layered access structures are included into a single access structure, and then, the hierarchical files can be encrypted with the integrated access structure. The cipher text components similar to attributes could be shared by the files. Therefore, both cipher text storage and time cost of encryption is preserved. Moreover, the proposed scheme is proved to be secure under the entire assumption. Experimental simulation shows that the proposed method is more capable in terms of encryption and decryption. With the number of the files increasing, the benefits of our method more and more clear.

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