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Reducing the ciphertext expansion in image homomorphic encryption via linear interpolation technique
Li Y.2; Zhou J.2; Li Y.2; Au O.C.1
2016-02-23
Conference NameIEEE Global Conference on Signal and Information Processing (GlobalSIP)
Source Publication2015 IEEE Global Conference on Signal and Information Processing, GlobalSIP 2015
Pages800-804
Conference DateDEC 13-16, 2015
Conference PlaceOrlando, FL
Abstract

Homomorphic encryption becomes one of the key components in many emerging applications, e.g., cloud computing, to achieve privacy-preserving data processing. However, one of the major drawbacks that precludes the widespread adoption of homomorphic encryption is the huge expansion of the ciphertext. This problem becomes even more severe when multimedia data (images/videos) are handled, as these files are essentially of large sizes. This work addresses this challenging issue and proposes a strategy of reducing the ciphertext expansion in image homomorphic encryption. To this end, a randomly selected subset of the pixels are encrypted using homomorphic cryptosystem to form one part of the ciphertext. The remaining pixels are encrypted by relating them with this random subset through a linear interpolation technique. The whole homomorphically encrypted image can be obtained, upon receiving all the ciphertexts, by exploiting the homomorphic property and the linearity. It is demonstrated that the proposed scheme is secure, and is capable of achieving significant reduction of the ciphertext expansion, while perfectly preserving the homomorphic property.

KeywordCiphertext Expansion Homomorphic Encryption Linear Interpolation
DOI10.1109/GlobalSIP.2015.7418307
URLView the original
Indexed BySCI
Language英语
WOS Research AreaComputer Science
WOS SubjectComputer Science, Artificial Intelligence
WOS IDWOS:000380477600164
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Cited Times [WOS]:2   [WOS Record]     [Related Records in WOS]
Document TypeConference paper
CollectionDEPARTMENT OF COMPUTER AND INFORMATION SCIENCE
Affiliation1.Hong Kong University of Science and Technology
2.Universidade de Macau
Recommended Citation
GB/T 7714
Li Y.,Zhou J.,Li Y.,et al. Reducing the ciphertext expansion in image homomorphic encryption via linear interpolation technique[C],2016:800-804.
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