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Title:
CCA-Secure PRE Scheme without Random Oracles
Authors: Jun Shao, Zhenfu Cao, 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.
ePrint: https://eprint.iacr.org/2010/112
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