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• W2620783544 abstract "The challenge of maintaining confidentiality of stored data in cloud is of utmost importance to realize the potential of cloud computing as an emerging storage solution service. Storing data in encrypted form may solve the problem, but exposes data to an adversary for each required computation. This repeated encryption decryption also diminishes the essence of cloud for storing encrypted database and huge computation power of cloud remains unused. Fully homomorphic encryption (FHE) is an effective scheme to support arbitrary operations directly on encrypted data, but has serious performance issues. In this paper, we have considered sorting on encrypted data, which is a frequently required database operation. We have investigated the feasibility of performing comparison as well as partition based sort on CPA resistant FHE data and highlight an important observation that time requirement of partition based sort on FHE data is no better than comparison based sort owing to the underlying security of the cryptosystem. We identify the recrypt operation, which is the denoising step of FHE as the main reason of costly timing requirement of such operations. We propose a FHE specific two stage sorting technique termed as Lazysort with reduced recrypt operation, which proves to be better in terms of performance on FHE data in comparison to partition as well as comparison sort. Finally, we provide some multi-core implementation results to show that with proper implementation tricks performance of FHE computations can be improved further." @default.
• W2620783544 created "2017-06-09" @default.
• W2620783544 creator A5015851735 @default.
• W2620783544 creator A5050495989 @default.
• W2620783544 date "2020-05-01" @default.
• W2620783544 modified "2023-10-16" @default.
• W2620783544 title "Sorting of Fully Homomorphic Encrypted Cloud Data: Can Partitioning be Effective?" @default.
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• W2620783544 doi "https://doi.org/10.1109/tsc.2017.2711018" @default.
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