| COMPUTER SCIENCE AND TECHNOLOGY |
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Multi-user fully homomorphic encryption scheme based on proxy re-encryption for cloud computing |
| LI Taoshen1,2, LIU Qing1, HUANG Ruwei1,2 |
1. School of Computer, Electronics and Information, Guangxi University, Nanning 530004, China;
2. Guangxi Colleges and Universities Key Laboratory of Parallel and Distributed Computing, Nanning 530004, China |
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Abstract Cloud computing involves multi-user sharing, user privacy and security, and ciphertext evaluation. This paper presents a multi-user, fully homomorphic encryption scheme based on proxy re-encryption for cloud computing. The scheme uses different public keys to encrypt the ciphertexts of different users, so different user ciphertexts provide ciphertext independence and indiscernibility. When a ciphertext is uploaded to the cloud, the ciphertext of one user is re-encrypted by the cloud service provider (CPS) as the agent and converted into a ciphertext for the same user. This allows the ciphertext calculation between the two users to meet the fully homomorphic computing requirements. A security analysis shows that the security of the this scheme is based on the harder problem of learning with errors (LWE) and can resist the chosen plaintext attack (in the generic bilinear group radom oracal model). Tests show that this scheme efficiently implements fully homomorphic evaluations of different user ciphertexts and supports multi-user sharing.
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| Keywords
cloud computing
fully homomorphic encryption
multi-user
proxy
ciphertext re-encryption
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Issue Date: 15 February 2018
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2018,
Vol. 58
