Achieving key privacy without losing CCA security in proxy re-encryption

作者：Shao, Jun^*; Liu, Peng; Zhou, Yuan

来源：Journal of Systems and Software, 2012, 85(3): 655-665.

DOI：10.1016/j.jss.2011.09.034

• Proxy re-encryption
• Chosen ciphertext security
• Key privacy
• Standard model

In proxy re-encryption (PRE), a semi-trusted proxy can transform a ciphertext under the delegator's public key into another ciphertext that the delegatee can decrypt by his/her own private key. 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. Some of these applications require that the underlying PRE scheme is CCA-secure and key-private. However, to the best of our knowledge, none of the existing PRE schemes satisfy this security requirement in the standard model. In this paper, based on the 5-Extended Decision Bilinear Diffie-Hellman assumption and Decision Diffie-Hellman assumption, we propose the first- such PRE scheme, which solves an open problem left by Ateniese et al. (2009).

• 出版日期2012-3
• 单位浙江工商大学