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arXiv · 2305.15772

Security Impact Analysis of Degree of Field Extension in Lattice Attacks on Ring-LWE Problem

Yuri Lucas Direbieski·Hiroki Tanioka·Kenji Matsuura·Hironori Takeuchi·Masahiko Sano·Tetsushi Ueta
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Abstract

Modern information communications use cryptography to keep the contents of communications confidential. RSA (Rivest-Shamir-Adleman) cryptography and elliptic curve cryptography, which are public-key cryptosystems, are widely used cryptographic schemes. However, it is known that these cryptographic schemes can be deciphered in a very short time by Shor's algorithm when a quantum computer is put into practical use. Therefore, several methods have been proposed for quantum computer-resistant cryptosystems that cannot be cracked even by a quantum computer. A simple implementation of LWE-based lattice cryptography based on the LWE (Learning With Errors) problem requires a key length of $O(n^2)$ to ensure the same level of security as existing public-key cryptography schemes such as RSA and elliptic curve cryptography. In this paper, we attacked the Ring-LWE (RLWE) scheme, which can be implemented with a short key length, with a modified LLL (Lenstra-Lenstra-Lov\'asz) basis reduction algorithm and investigated the trend in the degree of field extension required to generate a secure and small key. Results showed that the lattice-based cryptography may be strengthened by employing Cullen or Mersenne prime numbers as the degree of field extension.

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Yuri Lucas Direbieski, Hiroki Tanioka, Kenji Matsuura, Hironori Takeuchi, Masahiko Sano, Tetsushi Ueta. 2023-05-25. Security Impact Analysis of Degree of Field Extension in Lattice Attacks on Ring-LWE Problem. https://doi.org/10.1109/compsac57700.2023.00221

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