期刊
INFORMATION SCIENCES
卷 482, 期 -, 页码 47-62出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.ins.2018.12.062
关键词
KP-ABE; CP-ABE; k-BDH assumption family; Selective security model; PKFA
资金
- National Key R and D Program of China [2017YFB0802000]
- National Natural Science Foundation of China [61772147, 61300204, 61702197]
- Humanities and social science research project of Ministry of Education [15YJCZH029]
- Project of the 13th Five-year Plan for the Development of Philosophy and Social Sciences in Guangzhou [2017GZQN05]
- Guangdong Province Natural Science Foundation of major basic research and Cultivation project [2015A030308016]
- Natural Science Foundation of Guangdong Province [2017A030310261]
- Colleges And Universities Innovation Team Construction Project Guangdong province [2015KCXTD014]
- National Cryptography Development Fund [MMJJ20170117]
- Guangzhou City Bureau of cooperative innovation project [1201610005]
- Science and Technology Planning Project of Guangdong Province [2017A020208054]
Attribute-Based Encryption (ABE), a special type of public key encryption, efficiently shares sensitive data with fine-grained access control. ABE can be classified into two types: Ciphertext-Policy ABE (CP-ABE) and Key-Policy ABE (KP-ABE). However, the securities of most presented ABE systems were reduced to the q-type DBDH (Dicisional Diffie-Hellman Assumption) assumptions, which are stronger than the DBDH assumption. So, the above mentioned ABE systems become insecure if DBDH is proved to be insecure. We propose a new ABE framework, called security-level switchable ABE (SLS-ABE). In SLS-ABE framework, a series of ABE systems can be generated and their securities are reduced to a k-BDH assumption family proposed by Benson et al. The k-BDH assumption family has the following properties: 1) any assumption in the k-BDH assumption family is associated with a parameter k, and the assumption becomes strictly weaker as the parameter k increases. 2) the 1-BDH assumption is proved to be equivalent to the DBDH assumption. So, all the k-BDH assumptions where k > 1 are weaker than DBDH assumption. We apply the technique of Benson et al. to construct ABE on k-BDH assumption, furthermore, we design a new framework to support the flexible switchable security-level for users. Concretely, the master public key, the master secret key and core keys issued by the system are constant. A User can generate different security-level public key secret key pairs if it holds the core key. We propose a public key forgery attack model (PKFA) to capture the behaviors of adversary for generating a forged public key. We formally prove the selective-CPA security and PKFA security of our ABE systems. We compare the performances of our systems with Waters' ABE systems. (C) 2019 Elsevier Inc. All rights reserved.
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