Efficient and provably-secure certificateless proxy re-encryption scheme for secure cloud data sharing
Efficient and provably-secure certificateless proxy re-encryption scheme for secure cloud data sharing
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DOI：
10.1007/s12204-014-1514-6
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发表时间：
2014-08
影响因子：
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通讯作者：
Liangliang Wang;Kefei Chen;Xianping Mao;Yongtao Wang
中科院分区：
文献类型：
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作者：
Liangliang Wang;Kefei Chen;Xianping Mao;Yongtao Wang
在当前的云计算系统中，大量的敏感数据被共享给其他云用户。为了保持这些数据的机密性，数据所有者应该在外包之前加密数据。我们选择代理重新加密（PRE）作为云数据加密技术。在PRE系统中，半可信代理可以将一个公钥下的密文转换成另一个公钥下的同一消息的密文，但代理不能获得关于消息的任何信息。在本文中，我们提出了一个无证书的PRE（CL-PRE）方案没有配对。该方案的安全性可被证明等价于随机预言模型下的计算Diffie-Hellman（CDH）问题。与其他现有的CL-PRE方案相比，我们的计划需要更少的计算成本，是显着更有效的。新方案不需要公钥证书来保证公钥的有效性，解决了基于身份公钥密码体制中的密钥托管问题。
In current cloud computing system, large amounts of sensitive data are shared to other cloud users. To keep these data confidentiality, data owners should encrypt their data before outsourcing. We choose proxy reencryption (PRE) as the cloud data encryption technique. In a PRE system, a semi-trusted proxy can transform a ciphertext under one public key into a ciphertext of the same message under another public key, but the proxy cannot gain any information about the message. In this paper, we propose a certificateless PRE (CL-PRE) scheme without pairings. The security of the proposed scheme can be proved to be equivalent to the computational Diffie-Hellman (CDH) problem in the random oracle model. Compared with other existing CL-PRE schemes, our scheme requires less computation cost and is significantly more efficient. The new scheme does not need the public key certificates to guarantee validity of public keys and solves the key escrow problem in identity-based public key cryptography.