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Journal of Information Science and Engineering, Vol. 30 No. 2, pp. 333-345 (March 2014)

Constant Size Ciphertext and Private Key HIBE without Random Oracles*

1School of Computer and Information
Shanghai Second Polytechnic University
Shanghai, 201209 P.R. China
2School of Computer and Electronic Information
Guangxi University
Nanning, 530004 P.R. China
E-mail: {xmhu; wangjian; ycyang}; {hjxu}

Almost all existing hierarchical identity-based encryption (HIBE) schemes fully secure in the standard model at present have a drawback that at least one ciphertext size or private key size must rely on the hierarchy depth of identity. This drawback increases the computation and communication cost. In order to solve the problem, a new HIBE scheme with high efficiency is proposed, which has constant size ciphertext and private key, i.e. both ciphertext size and private key size are independent of the level of the hierarchy. Whats more, the proposed scheme is fully secure in the standard model with a tight reduction. To the best of our knowledge, it is the first scheme that both ciphertext and private key achieve O(1) size with full security in the standard model.

Keywords: HIBE, standard model, identity-based encryption, selective-id model, constant size, provable security

Full Text () Retrieve PDF document (201403_04.pdf)

Received June 12, 2012; revised June 11&July 9, 2013; accepted August 6, 2013.
Communicated by Wen-Guey Tzeng.
* This work was supported by the National Natural Science Foundation of China (Grant No. 61103213), Supported by Innovation Program of Shanghai Municipal Education Commission (No. 14ZZ167).