A reconciliation approach to key generation based on Module-LWE

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Authors Charbel Saliba, Laura Luzzi, Cong Ling arXiv ID 2001.04280 Category cs.CR: Cryptography & Security Cross-listed cs.IT Citations 0 Venue IACR Cryptology ePrint Archive Last Checked 4 months ago
Abstract
We consider a key encapsulation mechanism (KEM) based on Module-LWE where reconciliation is performed on the 8-dimensional lattice $E_8$, which admits a fast CVP algorithm. Our scheme generates 256 bits of key and requires 3 or 4 bits of reconciliation per dimension. We show that it can outperform Kyber in terms of the modulus q with comparable error probability. We prove that our protocol is IND-CPA secure and improves the security level of Kyber by 7.3%.
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