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Journal of Information Science and Engineering, Vol. 32 No. 6, pp. 1595-1611 (November 2016)

Attribute-Based Online/Offline Encryption with Outsourcing Decryption*

1School of Science
2College of Computer Science and Technology
Nantong University
Nantong, 226019 P.R. China
E-mail: {wzj8855; jhwang};

Attribute-based encryption (ABE) is a promising encryption for fine-grained sharing of ciphertext based on usersíŽ attributes. One drawback of ABE is that the encryption and decryption computational costs grow with the number of attributes and the complexity of the access policy. In scenarios where mobile devices are required, it will make encryption and decryption a possible bottleneck for these applications. To largely eliminate computational overhead for mobile devices, we propose a novel attribute-based online/offline encryption with outsourcing decryption (ABOOE-OD). First, the encryption process is split into the offline and online phases. Second, we modify the key generation and decryption algorithms to handle the ciphertext, and outsource the majority of decryption to cloud servers without compromising its security. Our first ABOOE-OD scheme is proven to be secure against the chosen-plaintext attack. We present an attrib-ute-based online/off- line KEM with outsourcing decapsulation (ABOOKEM-OD), and construct a generic transformation to achieve CCA security for ABOOE-OD from any ABOOKEM-OD with one-wayness. Finally, we compare our schemes with previous schemes, and provide an implementation of our scheme. The performance measurements indicate ABOOE-OD is very suitable for mobile devices to perform the online encryption and decryption operations without significantly draining the battery.

Keywords: attribute-based encryption, online/offline, outsourcing decryption, mobile devices, key encapsulation mechanism

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Received August 28, 2015; revised November 8, 2015; accepted March 6, 2016.
Communicated by Hahn-Ming Lee.
+ Corresponding author: Hai-Ying Ma.
* This work is supported by the National Natural Science Foundation of China (No. 61402244, 11371207, 61371111, 61273103), the Jiangsu StudentsíŽ Project for Innovation and Entrepreneurship Training Program (No.201510304027z), the Fund of Nantong University Doctoral Start-up Scientific Research (No.15B10) and the Natural Science Foundation of Nantong University (No.15z06).