Conference Proceeding Article
In ciphertext-policy attributed-based encryption (CP-ABE), each ciphertext is labeled by the encryptor with an access structure (also called ciphertext policy) and each private key is associated with a set of attributes. A user should be able to decrypt a ciphertext if and only if his private key attributes satisfy the access structure.The traditional security property of CP-ABE is plaintext privacy, which ciphertexts reveal no information about the underlying plaintext. At ACNS’08, Nishide, Yoneyama and Ohta introduced the notion of ciphertext-policy hiding CP-ABE. In addition to protecting the privacy of plaintexts, ciphertext-policy hiding CP-ABE also protects the description of the access structures associated with ciphertexts. They observed that ciphertext-policy hiding CP-ABE can be constructed from attribute-hiding inner-product predicate encryption (PE), and presented two constructions of ciphertext-policy hiding CP-ABE supporting restricted access structures, which can be expressed as AND gates on multi-valued attributes with wildcards. However, their schemes were only proven selectively secure.In this paper, we first describe the construction of ciphertext-policy hiding CP-ABE from attribute-hiding inner-product PE formally. Then, we propose a concrete construction of ciphertext-policy hiding CP-ABE supporting the same access structure as that of Nishide, Yoneyama and Ohta, but our scheme is proven fully secure.
Ciphertext Policy Attribute-Based Encryption, Predicate Encryption, Dual System Encryption
Information Security Practice and Experience: 7th International Conference, ISPEC 2011, Guangzhou, China, May 30 - June 1: Proceedings
City or Country
LAI, Junzuo; DENG, Robert H.; and LI, Yingjiu.
Fully Secure Cipertext-Policy Hiding CP-ABE. (2011). Information Security Practice and Experience: 7th International Conference, ISPEC 2011, Guangzhou, China, May 30 - June 1: Proceedings. 6672, 24-39. Research Collection School Of Information Systems.
Available at: http://ink.library.smu.edu.sg/sis_research/1416
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