密码学报2016，Vol.3Issue(5)：471-479,9.DOI:10.13868/j.cnki.jcr.000144
隐藏树型访问结构的属性加密方案*
Attribute-based Encryption Scheme with Hidden Tree Access Structures
摘要
Abstract
In most traditional attribute-based encryption schemes, encryptor often sends ciphertext to decryptor along with an access structure, but sometimes the access structure itself contains privacy information. However, existing anonymous ciphertext-policy attribute-based encryption can only support And-gate, those schemes do not meet the demand of attribute-based fine-grained access control structures. A few schemes which achieve fine-grained access structures are far away from practical requirements, because of the long ciphertext and keys and a large amount of computational cost. This paper proposes a new anonymous ciphertext-policy attribute-based encryption scheme over a prime order bilinear group, which is based on access tree by using asymmetric bilinear pairings. This new scheme hides access structure in ciphertext by CP-ABE, which comes to protect the plaintext and hides the access structure. And the problem that decryptor will get related information about encryption by analyzing the access structure and know the identity of eligible users is solved. The scheme relies on the Decision Bilinear Diffie-Hellman Problem in Type3 (DBDH-3) assumptions, and is proven to be fully secure under standard model. Compared with other similar constructions, the performance advantage of the proposed scheme achieves fine-grained access control, and improves efficiency of computation and feasibility in practical applications while reducing key and ciphertext length.关键词
属性基加密/密文策略/隐藏访问结构/非对称双线性对Key words
attribute-based encryption/ciphertext policy/hidden access structures/asymmetry bilinear pairings分类
信息技术与安全科学引用本文复制引用
李新,彭长根,牛翠翠..隐藏树型访问结构的属性加密方案*[J].密码学报,2016,3(5):471-479,9.基金项目
国家自然科学基金(61262073,61363068,61662009) （61262073,61363068,61662009）
贵州省普通高等学校创新人才团队项目(黔教合人才团队字2013-09) （黔教合人才团队字2013-09）
全国统计科研重点项目(2013LZ46) （2013LZ46）
贵州省统计科学研究课题项目(201511) （201511）
