Journal on Communications ›› 2014, Vol. 35 ›› Issue (7): 104-112.doi: 10.3969/j.issn.1000-436x.2014.07.013

• paperⅡ • Previous Articles     Next Articles

Efficient and provably secure attribute-based online/offline encryption schemes

Hai-ying MA1,2,Guo-sun ZENG1,GZhan-jun WAN3,Wei WANG1   

  1. 1 Department of Computer Science and Technology, Tongji University, Shanghai 201804, China
    2 College of Computer Science and Technology, Nantong University, Nantong 226019, China
    3 School of Science, Nantong University, Nantong 226007, China
  • Online:2014-07-25 Published:2017-06-24
  • Supported by:
    The National High Technology Research and Development Program of China(863 Program);The National Natural Science Foundation of China;The National Natural Science Foundation of China;The National Natural Science Foundation of China;The National Natural Science Foundation of China;The National Natural Science Foundation of China;The National Natural Science Foundation of China;The National Natural Science Foundation of China;The Joint of NSFC and Microsoft Asia Research;The Program of Shanghai Subject Chief Scientist;The Ph.D. Programs Foundation of Ministry of Education of China;The Special Fund for Fast Sharing of Science Paper in Net Era by CSTD;Shanghai Natural Science Foundation Program;The Science and Tech-nology Project of Nantong;The Science and Tech-nology Project of Nantong;The Science and Tech-nology Project of Nantong;The Natural Science Foundation of the Jiangsu Higher Education Institutions of China;The Natural Science Foundation of the Jiangsu Higher Education Institutions of China

Abstract:

To improve the encryption efficiency, the online/offline cryptography was extended to ABE and the primitive of attribute-based online/offline encryption (ABOOE) was proposed. The ABOOE non-trivially splited the encryption process into two phases: the offline phase first executed most of heavy computations prior to knowing the message and the attributes' set; and then the online phase only performed light computations to produce the ciphertext once the attrib-utes' set and the message get available. An ABOOE scheme was first constructed with the CPA security. To enhance its security, the primitive of attribute-based online/offline KEM (ABOOKEM) was also introduced and a concrete ABOOKEM scheme was given, and then a generic transformation was proposed to get security against chosen-ciphertext attack (CCA) for ABOOE from any ABOOKEM with one-wayness. This transformation greatly improved the security for ABOOE without increasing the amount of computation. Compared with the famous ABE schemes, the proposed schemes improved the encryption efficiency and get suitable for power-constrained devices.

Key words: attribute-based encryption, online/offline, key encapsulation, lightweight devices, provable security

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