一种改进的R-LWE同态掩码方案

Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2018-05-20 Cooperative journals: 《计算机应用研究》

李子臣 孙亚飞 杨亚涛 梁斓 曹广灿

Abstract： Aiming at the differential power attack of the encryption scheme based on lattice, Reparaz proposed an additively homomorphic R-LWE masking scheme in PQC 2016. This scheme can against the differential power attack effectively, but the additively homomorphic algorithm between the ciphertexts makes the size of noise increase. It declines the rate of decryption correctness. In view of this problem, this paper proposed an improved R-LWE homomorphic masking scheme. By introducing the modular switching technology, it made a modular reduction with the cipher text of additively homomorphic. Under the premising that plaintext and the ciphertext were corresponding, it declined the size of noise in the ciphertext. And it could improve the decryption correctness of the scheme. In order to protect the sub keys, it introduced a the random matrix to mask the sub key. And it makes the correctness analysis and the safety proof. The proposed scheme has better security and efficiency compared to the original scheme.

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