International Association for Cryptologic Research

International Association
for Cryptologic Research

IACR News item: 07 November 2019

Chi-Gon Jung, JongHyeok Lee, Youngjin Ju, Yong-Been Kwon, Seong-Woo Kim, Yunheung Paek
ePrint Report ePrint Report
The RLWE family algorithms submitted to the NIST post-quantum cryptography standardization process have each merit in terms of security, correctness, performance, and bandwidth. However, there is no splendid algorithm in all respects. Besides, various recent studies have been published that affect security and correctness, such as side-channel attacks and error dependencies. To date, though, no algorithm has fully considered all the aspects. We propose a novel Key Encapsulation Mechanism scheme called LizarMong, which is based on RLizard. LizarMong combines the merit of each algorithm and state-of-the-art studies. As a result, it achieves up to 85% smaller bandwidth and 3.3 times faster performance compared to RLizard. Compared to the NIST's candidate algorithms with a similar security, the bandwidth is about 5-42% smaller, and the performance is about 1.2-4.1 times faster. Also, our scheme resists the known side-channel attacks.

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