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Secure and efficient proxy re-encryption scheme based on key-homomorphic constrained PRFs in cloud computing
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DOI：10.1007/s10586-018-2862-z.png)
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摘要
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With the rapid development of cloud computing, its security and privacy are of great concern. Since the cloud service provider is not completely trustworthy, the security of the outsourced files has become serious issues. Identity-based proxy re-encryption (IBPRE) schemes have been proposed to achieve feasible access control of encrypted data under the condition of guaranteeing the confidentiality of data, which can transfer the original ciphertexts to the re-encrypted ciphertexts for a designated decryptor. However, most of the existing IBPRE schemes either do not support revocation or computational complexity is too high. In this paper, we combine the properties of constrained pseudorandom functions (PRFs) and key homomorphic PRFs to construct a secure and efficient proxy re-encryption scheme for cloud computing. In our proposed scheme, the data owner authenticates the requesters and distributes the decryption keys by using an identity-based key exchange method. Meanwhile, a proxy re-encryption scheme is used to achieve data sharing and ciphertext update. We present the security proof of our scheme. In addition, compared with other existing schemes, our scheme has low computational complexity and communication cost.
Keyword:
Cloud computing
Proxy re-encryption
Key exchange
Constrained PRFs
Key homomorphic PRFs
期刊
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4.1
论文数:
5.1K
被引数:
7.5K
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