Title

A key-policy attribute-based proxy re-encryption without random oracles

RIS ID

109198

Publication Details

Ge, C., Susilo, W., Wang, J., Huang, Z., Fang, L. & Ren, Y. (2016). A key-policy attribute-based proxy re-encryption without random oracles. The Computer Journal, 59 (7), 970-982.

Abstract

A conditional proxy re-encryption (CPRE) scheme enables the proxy to convert a ciphertext from Alice to Bob, if the ciphertext satisfies one condition set by Alice. To improve the issue of more fine-grained on the condition set, Fang, Wang, Ge and Ren proposed a new primitive named Interactive conditional PRE with fine grain policy (ICPRE-FG) in 2011, and left an open problem on how to construct CCA-secure ICPRE-FG without random oracles. In this paper, we answer this open problem affirmatively by presenting a new construction of CCA-secure key-policy attribute-based PRE (KP-ABPRE) without random oracles. In this paper, we enhance the security model of Fang's ICPRE-FG scheme by allowing the adversary to make some extra queries, which do not help them win the game trivially. Finally, we present a CCA-secure KP-ABPRE without random oracles under the 3-weak decisional bilinear Diffie-Hellman inversion(3-wDBDHI) assumption.

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Link to publisher version (DOI)

http://dx.doi.org/10.1093/comjnl/bxv100