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

Zhang Wei
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Zhang Wei: Engineering University of Chinese Armed Police Force, Xi'an, China

International Journal of Technology and Human Interaction (IJTHI), 2016, vol. 12, issue 2, 72-82

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.

Date: 2016
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