Attribute-based encryption with hidden threshold access structure

Attribute-based encryption with hidden threshold access structure

Fugeng Zeng1, 2 Chunxiang Xu2

COMPUTER MODELLING & NEW TECHNOLOGIES 2014 18(12B) 19-22                                                                 

1School of Computer Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China

2School of Science and Engineering, Qiongzhou University, Hainan 572000, China

This paper proposes attribute-based encryption schemes in which threshold access structures are hidden. With these schemes, an encryptor can encrypt data with hidden attributes. After receiving the ciphertext from the encryptor, a decryptor first tests which block of ciphertext is associated with which attribute. Decryption will be successful if the attributes associated with the secret key of the decryptor satisfy the access structure associated with the encrypted data. The security of the proposed construction is proved in the selective model based on the decisional bilinear Diffie-Hellman assumption. The proposed scheme shows greater flexibility than other hidden access control encryption schemes.