Chosen-ciphertext secure multi-hop identity-based conditional proxy re-encryption with constant-size ciphertexts

被引：40

作者：

Liang, Kaitai ^{[1
]}

Chu, Cheng-Kang ^{[2
]}

Tan, Xiao ^{[1
]}

Wong, Duncan S. ^{[1
]}

Tang, Chunming ^{[3
]}

Zhou, Jianying ^{[2
]}

机构：

[1] City Univ Hong Kong, Dept Comp Sci, Kowloon, Hong Kong, Peoples R China

[2] Inst Infocomm Res, Infocomm Secur Dept, Singapore 138632, Singapore

[3] Guangzhou Univ, Sch Math & Informat Sci, Guangzhou 510006, Guangdong, Peoples R China

来源：

THEORETICAL COMPUTER SCIENCE | 2014年 / 539卷

关键词：

Conditional proxy re-encryption; Identity-based proxy re-encryption; Bilinear map; Chosen-ciphertext security; Constant size ciphertext; CRYPTOSYSTEMS; SCHEMES; IBE;

D O I：

10.1016/j.tcs.2014.04.027

中图分类号：

TP301 [理论、方法];

学科分类号：

081202 ;

摘要：

Proxy Re-Encryption (PRE) allows one user to delegate the decryption rights of his/her ciphertexts to another user. Since the introduction of Multi-Hop Identity-Based PRE (MH-IBPRE) by Green and Ateniese, the ciphertext size and the decryption complexity grow linearly in the number of re-encryption "hops". In this paper, for the first time, we propose an MH-IBPRE that maintains the (constant) ciphertext size and computational complexity regardless of the number of re-encryption hops. Moreover, our scheme is bidirectional and also supports conditional re-encryption. The scheme is proven secure against selective identity and chosen-ciphertext attacks and collusion resistant in the standard model. As of independent interest, we also show that the conditional re-encryption can also be extended to a set of conditions. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：87 / 105

页数：19

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