With a Ciphertext-Policy Attribute-Based Encryption (CP-ABE) scheme, a user's private key is associated with a set of attributes and the data is encrypted under an access policy defined by the message sender. A user can decrypt a ciphertext if and only if her attributes satisfy the access policy. In CP-ABE, since the message sender enforces the access policy during the encryption phase, the policy moves with the encrypted data. In this paper, we provide an efficient CP-ABE scheme which can express any access policy represented by a formula involving the and (∧) and or (∨) operators. The scheme is secure under Decision Bilinear Diffie-Hellman (DBDH) assumption. Furthermore, we extend the expressiveness of the scheme by including the of operator in addition to (∧) and (∨). We provide a comparison with some existing CP-ABE schemes and show that our schemes are more efficient. © 2009 Springer Berlin Heidelberg.
CITATION STYLE
Ibraimi, L., Tang, Q., Hartel, P., & Jonker, W. (2009). Efficient and provable secure ciphertext-policy attribute-based encryption schemes. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 5451 LNCS, pp. 1–12). https://doi.org/10.1007/978-3-642-00843-6_1
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