International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: CCA-Secure PRE Scheme without Random Oracles

Jun Shao
Zhenfu Cao
Peng Liu
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Abstract: In a proxy re-encryption scheme, a semi-trusted proxy can transform a ciphertext under Alice's public key into another ciphertext that Bob can decrypt. However, the proxy cannot access the plaintext. Due to its transformation property, proxy re-encryption can be used in many applications, such as encrypted email forwarding. In this paper, by using the techniques of Canetti-Hohenberger and Kurosawa-Desmedt, we propose a new single-use unidirectional proxy re-encryption scheme. Our proposal is secure against chosen ciphertext attack (CCA) and collusion attack in the standard model.
  title={CCA-Secure PRE Scheme without Random Oracles},
  booktitle={IACR Eprint archive},
  keywords={public-key cryptography / proxy re-encryption},
  note={ 14669 received 1 Mar 2010, last revised 1 Mar 2010},
  author={Jun Shao and Zhenfu Cao and Peng Liu},