Reliable and confidential cloud storage with efficient data forwarding functionality

Cloud computing is a promising computing paradigm which has drawn extensive attention. Serious concerns over the reliability and confidentiality of the outsourced data are arising. Traditional encryption methods can, guarantee data confidentiality, however, it also limits the cloud's functional...

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Published in:	IET communications Vol. 10; no. 6; pp. 661 - 668
Main Authors:	Liu, Jian, Wang, Huimei, Xian, Ming, Rong, Hong, Huang, Kun
Format:	Journal Article
Language:	English
Published:	The Institution of Engineering and Technology 14.04.2016
Subjects:	Algorithms all‐or‐nothing‐transform‐based encryption Blending cipher data Cloud computing confidential cloud storage confidentiality Construction cryptography data forwarding functionality Data storage ElGamal‐based proxy re‐encryption algorithm Encryption encryption method file dispersal file retrieval Performance evaluation Reed-Solomon codes Reed‐Solomon code reliability reliable cloud storage robust data storage storage management reliable cloud storage reliability confidentiality cryptography data forwarding functionality file retrieval confidential cloud storage ElGamal-based proxy re-encryption algorithm robust data storage Reed-Solomon code encryption method Reed-Solomon codes storage management cipher data file dispersal cloud computing all-or-nothing-transform-based encryption
ISSN:	1751-8628, 1751-8636
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Abstract	Cloud computing is a promising computing paradigm which has drawn extensive attention. Serious concerns over the reliability and confidentiality of the outsourced data are arising. Traditional encryption methods can, guarantee data confidentiality, however, it also limits the cloud's functionality as few operations are supported over encrypted data. In this study, the authors construct an enhanced cloud that not only provides secure and robust data storage, but also supports the functionality that the cipher data can be forwarded without being retrieved back. Specifically, they design an all-or-nothing-transform-based encryption and a variant of ElGamal-based proxy re-encryption algorithms, blending them with Reed–Solomon code, the authors’ scheme is quite more efficient compared with previous studies because it only needs to update partial data blocks instead of the whole file for data forwarding. Besides, the authors’ scheme also satisfies another practical property that the original data owner can no longer decrypt or forward the re-encrypted data to others after a complete forwarding instance, which is termed to be ‘original inaccessibility’ in this study. Analysis shows that the authors’ scheme is secure and satisfactory. Finally, the authors theoretically and experimentally evaluate its performance and the results indicate that their scheme is efficient during file dispersal, forward and retrieval.
AbstractList	Cloud computing is a promising computing paradigm which has drawn extensive attention. Serious concerns over the reliability and confidentiality of the outsourced data are arising. Traditional encryption methods can, guarantee data confidentiality, however, it also limits the cloud's functionality as few operations are supported over encrypted data. In this study, the authors construct an enhanced cloud that not only provides secure and robust data storage, but also supports the functionality that the cipher data can be forwarded without being retrieved back. Specifically, they design an all-or-nothing-transform-based encryption and a variant of ElGamal-based proxy re-encryption algorithms, blending them with Reed–Solomon code, the authors’ scheme is quite more efficient compared with previous studies because it only needs to update partial data blocks instead of the whole file for data forwarding. Besides, the authors’ scheme also satisfies another practical property that the original data owner can no longer decrypt or forward the re-encrypted data to others after a complete forwarding instance, which is termed to be ‘original inaccessibility’ in this study. Analysis shows that the authors’ scheme is secure and satisfactory. Finally, the authors theoretically and experimentally evaluate its performance and the results indicate that their scheme is efficient during file dispersal, forward and retrieval.
Author	Liu, Jian Rong, Hong Xian, Ming Wang, Huimei Huang, Kun
Author_xml	– sequence: 1 givenname: Jian surname: Liu fullname: Liu, Jian email: ljabc730@nudt.edu.cn organization: State Key Laboratory of CEMEE, National University of Defense Technology, Changsha, People's Republic of China – sequence: 2 givenname: Huimei surname: Wang fullname: Wang, Huimei organization: State Key Laboratory of CEMEE, National University of Defense Technology, Changsha, People's Republic of China – sequence: 3 givenname: Ming surname: Xian fullname: Xian, Ming organization: State Key Laboratory of CEMEE, National University of Defense Technology, Changsha, People's Republic of China – sequence: 4 givenname: Hong surname: Rong fullname: Rong, Hong organization: State Key Laboratory of CEMEE, National University of Defense Technology, Changsha, People's Republic of China – sequence: 5 givenname: Kun surname: Huang fullname: Huang, Kun organization: State Key Laboratory of CEMEE, National University of Defense Technology, Changsha, People's Republic of China
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Keywords	reliable cloud storage reliability confidentiality cryptography data forwarding functionality file retrieval confidential cloud storage ElGamal-based proxy re-encryption algorithm robust data storage Reed-Solomon code encryption method Reed-Solomon codes storage management cipher data file dispersal cloud computing all-or-nothing-transform-based encryption
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SubjectTerms	Algorithms all‐or‐nothing‐transform‐based encryption Blending cipher data Cloud computing confidential cloud storage confidentiality Construction cryptography data forwarding functionality Data storage ElGamal‐based proxy re‐encryption algorithm Encryption encryption method file dispersal file retrieval Performance evaluation Reed-Solomon codes Reed‐Solomon code reliability reliable cloud storage robust data storage storage management
Title	Reliable and confidential cloud storage with efficient data forwarding functionality
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