Title: A lightweight fully homomorphic encryption scheme for cloud security

Authors: V. Biksham; D. Vasumathi

Addresses: JNTU Hyderabad, India; Department of Computer Science and Engineering, Sreyas Institute of Engineering and Technology, Hyderabad, India ' JNTUHCEH, Jawaharlal Nehru Technological University, Hyderabad, India

Abstract: A decade ago, fully homomorphic encryption mechanism came as a great breakthrough in security. In homomorphic encryption, ciphertext (data in encrypted format) should be sent to the cloud, the computations are made on the ciphertext, and the result of this computation is a ciphertext form itself. If the result of the computation is decrypted, then the correct plaintext result must be obtained. Maintaining the secrecy and privacy of data, generally in cloud scenario, has become an intense challenge for present day's practical applications. However, transferring private data to any third party consists of large amount risks of disclosure of private data while computation. This problem can be addressed by performing computations on encrypted data without decrypting it. In this paper, we propose a fully homomorphic encryption framework which is lightweight in nature and utilising symmetric key. Analysis of the scheme confirms that our proposed system is efficient and practical to adopt it in various cloud computation applications. Further, to prove the novelty, we present the implementation results and given the comparative analysis of our scheme with significant state-of-the-art.

Keywords: homomorphic encryption; symmetric FHE; privacy; security; cloud server.

DOI: 10.1504/IJICS.2020.109482

International Journal of Information and Computer Security, 2020 Vol.13 No.3/4, pp.357 - 371

Received: 16 Jul 2018
Accepted: 21 Oct 2018
Published online: 10 Sep 2020 *

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