Cryptology ePrint Archive: Report 2010/112

CCA-Secure PRE Scheme without Random Oracles

Jun Shao and Zhenfu Cao and Peng Liu

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.

Category / Keywords: public-key cryptography / proxy re-encryption

Date: received 1 Mar 2010, last revised 1 Mar 2010

Contact author: chn junshao at gmail com

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Version: 20100304:141248 (All versions of this report)

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