Cloud computing is a revolutionary computing paradigm, which enables flexible, on-demand, and low-cost usage of computing resources, but the data is outsourced to some cloud servers, and various privacy concerns emerge from it. Various schemes based on the attribute-based encryption have been proposed to secure the cloud storage. However, most work focuses on the data contents privacy and the access control, while less attention is paid to the privilege control and the identity privacy. In this paper, we present a semi anonymous privilege control scheme Anony Control to address not only the data privacy, but also the user identity privacy in existing access control schemes. Anony Control decentralizes the central authority to limit the identity leakage and thus achieves semi anonymity. Besides, it also generalizes the file access control to the privilege control, by which privileges of all operations on the cloud data can be managed in a fine-grained manner. Subsequently, we present the AnonyControl-F, which fully prevents the identity leakage and achieve the full anonymity. Our security analysis shows that both AnonyControl and AnonyControl-F are secure under the decisional bilinear Diffie–Hellman assumption, and our performance evaluation exhibits the feasibility of our schemes.
[1]
Brent Waters,et al.
Ciphertext-Policy Attribute-Based Encryption
,
2007,
2007 IEEE Symposium on Security and Privacy (SP '07).
[2]
Sherman S. M. Chow,et al.
Improving privacy and security in multi-authority attribute-based encryption
,
2009,
CCS.
[3]
Brent Waters,et al.
Attribute-based encryption for fine-grained access control of encrypted data
,
2006,
CCS '06.
[4]
Melissa Chase,et al.
Multi-authority Attribute Based Encryption
,
2007,
TCC.
[5]
Adi Shamir,et al.
Identity-Based Cryptosystems and Signature Schemes
,
1984,
CRYPTO.
[6]
Kazuki Yoneyama,et al.
Attribute-Based Encryption with Partially Hidden Encryptor-Specified Access Structures
,
2008,
ACNS.
[7]
Brent Waters,et al.
Fuzzy Identity-Based Encryption
,
2005,
EUROCRYPT.
[8]
Ben Lynn,et al.
Toward Hierarchical Identity-Based Encryption
,
2002,
EUROCRYPT.
[9]
Rafail Ostrovsky,et al.
Attribute-based encryption with non-monotonic access structures
,
2007,
CCS '07.
[10]
Allison Bishop,et al.
Decentralizing Attribute-Based Encryption
,
2011,
IACR Cryptol. ePrint Arch..