%0 Journal Article
%A HU Ming-xing
%A QIN Pan-ke
%A TANG Yong-li
%A YE Qing
%A YU Jin-xia
%T Improved Multi-Identity Based Fully Homomorphic Encryption Scheme over Lattices
%D 2018
%R 10.13190/j.jbupt.2017-163
%J Journal of Beijing University of Posts and Telecommunications
%P 125-133
%V 41
%N 1
%X Aiming at low efficiency of trapdoor function in multi-identity based fully homomorphic encryption (mIBFHE) schemes, a new mIBFHE scheme was proposed. Firstly, the MP12 trapdoor function with Dual-Regev algorithm was combined to construct a transformable identity-based encryption (IBE) scheme, and a Mask system which supports to transform IBE scheme presented to mIBFHE scheme under standard model. Then, based on presented Mask system and eigenvector idea, the IBE schemes was transformed to mIBFHE scheme. Comparing with the similar schemes, the efficiency of the scheme is improved in trapdoor generation and preimage sampling stage, and the lattice dimension, the size of ciphertext and evaluated ciphertext, etc. are obviously reduced. The security of the presented scheme strictly is reduced to the hardness of learning with errors problem in the standard model.
%U https://journal.bupt.edu.cn/EN/10.13190/j.jbupt.2017-163