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Title:
Lore: An LWE-based Key Encapsulation Mechanism with Variable Modulus and CRT Compression
Authors: Zhongxiang Zheng, Anyu Wang, Chunhuan Zhao, Guangwu Xu, Zhengtao Jiang, Sibo Feng, Zhichen Yan, Shuang Sun, Xiaoyun Wang
Abstract:In this paper, we propose a new post-quantum lattice-based IND-CCA2-secure key encapsulation mechanism (KEM) named Lore. The scheme is based on a variant of MLWR problem following LPR structure with two new technologies called variable modulus and CRT compression, which provide a balance of decryption failure probability and ciphertext size. We prove its security in ROM/QROM and provide concrete parameters as well as reference implementation to show that our scheme enjoys high efficiency, compact bandwidth and proper decryption failure rate(DFR) corresponding to its security levels compared with former results.
ePrint: https://eprint.iacr.org/2025/2093
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