Provably secure ciphertext policy ABE

12 years 2 months ago
Provably secure ciphertext policy ABE
In ciphertext policy attribute-based encryption (CP-ABE), every secret key is associated with a set of attributes, and every ciphertext is associated with an access structure on attributes. Decryption is enabled if and only if the user’s attribute set satisfies the ciphertext access structure. This provides fine-grained access control on shared data in many practical settings, including secure databases and secure multicast. In this paper, we study CP-ABE schemes in which access structures are AND gates on positive and negative attributes. Our basic scheme is proven to be chosen plaintext (CPA) secure under the decisional bilinear Diffie-Hellman (DBDH) assumption. We then apply the Canetti-HaleviKatz technique to obtain a chosen ciphertext (CCA) secure extension using one-time signatures. The security proof is a reduction to the DBDH assumption and the strong existential unforgeability of the signature primitive. In addition, we introduce hierarchical attributes to optimize our ba...
Ling Cheung, Calvin C. Newport
Added 07 Jun 2010
Updated 07 Jun 2010
Type Conference
Year 2007
Where CCS
Authors Ling Cheung, Calvin C. Newport
Comments (0)