Privacy-Aware Attribute-Based Encryption with User Accountability

As a new public key primitive, attribute-based encryption (ABE) is envisioned to be a promising tool for implementing fine-grained access control. To further address the concern of user access privacy, privacy-aware ABE schemes are being developed to achieve hidden access policy recently. For the purpose of secure access control, there is, however, still one critical functionality missing in the existing ABE schemes, which is user accountability. Currently, no ABE scheme can completely prevent the problem of illegal key sharing among users. In this paper, we tackle this problem by firstly proposing the notion of accountable, anonymous, and ciphertext-policy ABE (CP-A3 BE, in short) and then giving out a concrete construction. We start by improving the state-of-the-art of anonymous CP-ABE to obtain shorter public parameters and ciphertext length. In the proposed CP-A3 BE construction, user accountability can be achieved in black-box model by embedding additional user-specific informa...

• Type: Conference
• Year: 2009
• Where: ISW
• Authors: Jin Li, Kui Ren, Bo Zhu, Zhiguo Wan
• Keywords: Abe Scheme, Access Control, Hidden Access Policy, Information Management, ISW 2009