JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) ›› 2016, Vol. 51 ›› Issue (12): 78-86.doi: 10.6040/j.issn.1671-9352.0.2015.479

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A compact construction for non-monotonic online/offline CP-ABE

  

  1. 1. Cryptography Engineering Institute, PLA Information Engineering University, Zhengzhou 450002, Henan, China;
    2. Department of Language Engineering, PLA University of Foreign Languages, Luoyang 471000, Henan, China
  • Received:2015-10-16 Online:2016-12-20 Published:2016-12-20

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Abstract: We proposed an online/offline ciphertext-policy attribute-based encryption scheme that could support non-monotonic access structure. In the offline phase, most of the computations for encryption are done; in the online phase, we transform the non-monotonic access structure with positive attribute sets into a monotonic access structure which is based on the linear secret sharing scheme with positive and negative attribute sets, then it only needs a small amount of addition and multiplication operations for the rest components of encryption. The selective security of the scheme under the n-(B)assumption was proved. Compared with the original non-monotonic CP-ABE scheme, our scheme remains the same on the public keys and the master secret keys, with only a small increase in computational complexity. However, the computational complexity during online phase is very small. We can combine our scheme with outsourcing techniques, thus the online encryption phase and the decryption phase could be completed on the resource-constrained small devices.

Key words: CP-ABE, online/offline, linear secret sharing scheme, selective security, non-monotonic access structure

CLC Number: 

  • TN918
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