LI Zi-chen, ZHANG Juan-mei, YANG Ya-tao, et al. A Fully Homomorphic Encryption Scheme Based on NTRU[J]. Acta Electronica Sinica, 2018, 46(4): 938-944. DOI: 10.3969/j.issn.0372-2112.2018.04.023.
本文提出一种基于公钥密码体制(Number Theory Research Unit,NTRU)选择明文攻击(Chosen Plaintext Attack,CPA)可证明安全的全同态加密方案.首先,对NTRU的密钥生成算法进行改进,通过格上的高斯抽象算法生成密钥对,避免了有效的格攻击,同时,没有改变密钥的分布.然后,基于改进的NTRU加密算法,利用Flattening技术,构造了一个全同态加密体制,并在标准模型下证明方案是选择明文攻击不可区分性IND-CPA安全的.
Abstract
A fully homomorphic encrgption scheme was presented based on number theory research unit (NTRU)
which is provable security about indistinguishable chosen plaintext attack (IND-CPA). Firstly
to avoid the effective lattice attacks
we modified the key generation algorithm of NTRU by Gaussian abstraction algorithm of lattices
and the distribution of the key is not changed. Then
we proposed a new homomorphic encryption scheme based on the improved NTRU encryption algorithm by using the Flattening technique. Its IND-CPA security was proved strictly under the standard model.