Fast \(\ell_\infty\)-Reduction of Rank-2 Lattices in $\mathbb{R}^n$ via a New Reduced-Basis Notion
The shortest vector problem (SVP) under the infinity norm ($\ell_\infty$-norm) is an important lattice problem with applications in lattice-based cryptography. In particular, the security analysis of the post-quantum signature standard ML-DSA highlights the importance of finding short solutions satisfying infinity-norm constraints, rather than only Euclidean norm bounds. However, most existing lattice reduction algorithms are developed for the Euclidean norm, while dedicated studies under the infinity norm remain limited. In this work, we focus on rank-two lattices in $\mathbb{R}^n$ and introduce a new notion of reduced basis under the infinity norm. Based on this definition, we propose an efficient lattice basis reduction algorithm that performs a multi-dimensional analogue of Euclidean division using a dominant coordinate of the basis vectors. Each non-terminal iteration guarantees a factor-two decrease of the maximum infinity norm of the basis vectors. We prove that the algorithm terminates and achieves a bit complexity of $O(nT^2)$, matching the asymptotic complexity order of the classical Lagrange--Gauss reduction. Moreover, the proposed algorithm saves at least $2n$ multiplications per iteration compared with the classical approach. Experiments demonstrate significant runtime improvements, especially for high-dimensional lattices. This work provides a foundation for developing lattice reduction techniques under the infinity norm.