Cryptology ePrint Archive: Report 2010/265
CCA-Secure Unidirectional Proxy Re-Encryption in the Adaptive Corruption Model without Random Oracles
Jian Weng and Minrong Chen and Yanjiang Yang and Robert H. Deng and Kefei Chen and Feng Bao
Abstract: Proxy re-encryption (PRE), introduced by Blaze, Bleumer and Strauss in Eurocrypt'98, allows a semi-trusted proxy to convert a ciphertext originally intended for Alice into an encryption of the same message intended for Bob. PRE has recently drawn great interest, and many interesting PRE schemes have been proposed. However, up to now, it is still an important question to come up with a chosen-ciphertext secure unidirectional PRE in the adaptive corruption model. To address this problem, we propose a new unidirectional PRE scheme, and prove its chosen-ciphertext security in the adaptive corruption model without random oracles. Compared with the best known unidirectional PRE scheme proposed by Libert and Vergnaud in PKC'08, our schemes enjoys the advantages of both higher efficiency and stronger security.
Category / Keywords: public-key cryptography / unidirectional proxy re-encryption, adaptive corruption model, chosen-ciphertext attack
Publication Info: A previous version of this paper appeared in Science China: Information Science, 2010, 53(3): 593-606
Date: received 8 May 2010
Contact author: cryptjweng at gmail com
Available format(s): Postscript (PS) | Compressed Postscript (PS.GZ) | PDF | BibTeX Citation
Version: 20100511:201712 (All versions of this report)
Short URL: ia.cr/2010/265
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