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A Pairing-based Homomorphic Encryption Scheme for Multi-User Settings

A Pairing-based Homomorphic Encryption Scheme for Multi-User Settings
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Author(s): Zhang Wei (Engineering University of Chinese Armed Police Force, China)
Copyright: 2020
Pages: 11
Source title: Cryptography: Breakthroughs in Research and Practice
Source Author(s)/Editor(s): Information Resources Management Association (USA)
DOI: 10.4018/978-1-7998-1763-5.ch017

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Abstract

A new method is presented to privately outsource computation of different users. As a significant cryptographic primitive in cloud computing, homomorphic encryption (HE) can evaluate on ciphertext directly without decryption, thus avoid information leakage. However, most of the available HE schemes are single-user, which means that they could only evaluate on ciphertexts encrypted by the same public key. Adopting the idea of proxy re-encryption, and focusing on the compatibility of computation, the authors provide a pairing-based multi-user homomorphic encryption scheme. The scheme is a somewhat homomorphic one, which can do infinite additions and one multiplication operation. Security of the scheme is based on subgroup decision problem. The authors give a concrete security model and detailed security analysis.

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