Efficient Conditional Proxy Re-encryption with Chosen-Ciphertext Security

被引：0

作者：

Weng, Jian ^{[1
,2
]}

Yang, Yanjiang ^{[3
]}

Tang, Qiang ^{[4
]}

Deng, Robert H. ^{[1
]}

Bao, Feng ^{[3
]}

机构：

[1] Singapore Management Univ, Sch Informat Syst, Singapore 178902, Singapore

[2] Jinan Univ, Dept Comp Sci, Guangzhou 510632, Guangdong, Peoples R China

[3] Inst Infocom Res I2R, Singapore 119613, Singapore

[4] Univ Twente, DIES, Fac EEMCS, NL-7500 AE Enschede, Netherlands

来源：

INFORMATION SECURITY, PROCEEDINGS | 2009年 / 5735卷

关键词：

Conditional proxy re-encryption; chosen-ciphertext security; random oracle;

D O I：

暂无

中图分类号：

TP301 [理论、方法];

学科分类号：

081202 ;

摘要：

Recently, a variant of proxy re-encryption, named conditional proxy re-encryption (C-PRE), has been introduced. Compared with traditional proxy re-encryption, C-PRE enables the delegator to implement fine-grained delegation of decryption rights, and thus is more useful in many applications. In this paper, based on a careful observation on the existing definitions and security notions for C-PRE, we re-formalize more rigorous definition and security notions for C-PRE. We further propose a more efficient C-PRE scheme, and prove its chosen-ciphertext security under the decisional bilinear Diffie-Hellman (DBDH) assumption in the random oracle model. In addition, we point out that, a recent C-PRE scheme fails to achieve the chosen-cipher text security.

引用

页码：151 / +

页数：4

共 22 条

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