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Paper: CCA-Secure Unidirectional Proxy Re-Encryption in the Adaptive Corruption Model without Random Oracles

Authors:
Jian Weng
Minrong Chen
Yanjiang Yang
Robert H. Deng
Kefei Chen
Feng Bao
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URL: http://eprint.iacr.org/2010/265
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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.
BibTeX
@misc{eprint-2010-23166,
  title={CCA-Secure Unidirectional Proxy Re-Encryption in the Adaptive Corruption Model without Random Oracles},
  booktitle={IACR Eprint archive},
  keywords={public-key cryptography / unidirectional proxy re-encryption, adaptive corruption model, chosen-ciphertext attack},
  url={http://eprint.iacr.org/2010/265},
  note={A previous version of this paper appeared in Science China: Information Science, 2010, 53(3): 593-606 cryptjweng@gmail.com 14737 received 8 May 2010},
  author={Jian Weng and Minrong Chen and Yanjiang Yang and Robert H. Deng and Kefei Chen and Feng Bao},
  year=2010
}