Recursive lattice reduction -- A framework for finding short lattice vectors
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866912335500673024 |
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| author | Aggarwal, Divesh Espitau, Thomas Peters, Spencer Stephens-Davidowitz, Noah |
| author_facet | Aggarwal, Divesh Espitau, Thomas Peters, Spencer Stephens-Davidowitz, Noah |
| contents | We propose a recursive lattice reduction framework for finding short non-zero vectors or dense sublattices of a lattice. The framework works by recursively searching for dense sublattices of dense sublattices (or their duals) with progressively lower rank. When the procedure encounters a recursive call on a lattice $L$ with relatively low rank, we simply use a known algorithm to find a shortest non-zero vector in $L$.
This new framework is complementary to basis reduction algorithms, which similarly work to reduce an $n$-dimensional lattice problem with some approximation factor $γ$ to a lower-dimensional exact lattice problem in some lower dimension $k$, with a tradeoff between $γ$, $n$, and $k$. Our framework provides an alternative and arguably simpler perspective. For example, our algorithms can be described at a high level without explicitly referencing any specific basis of the lattice, the Gram-Schmidt orthogonalization, or even projection (though, of course, concrete implementations of algorithms in this framework will likely make use of such things).
We present a number of instantiations of our framework. Our main concrete result is an efficient reduction that matches the tradeoff achieved by the best-known basis reduction algorithms. This reduction also can be used to find dense sublattices with any rank $\ell$ satisfying $\min\{\ell,n-\ell\} \leq n-k+1$, using only an oracle for SVP in $k$ dimensions, with slightly better parameters than what was known using basis reduction.
We also show a simple reduction with the same tradeoff for finding short vectors in quasipolynomial time, and a reduction from finding dense sublattices of a high-dimensional lattice to this problem in lower dimension. Finally, we present an automated search procedure that finds algorithms in this framework that (provably) achieve better approximations with fewer oracle calls. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_15064 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Recursive lattice reduction -- A framework for finding short lattice vectors Aggarwal, Divesh Espitau, Thomas Peters, Spencer Stephens-Davidowitz, Noah Data Structures and Algorithms We propose a recursive lattice reduction framework for finding short non-zero vectors or dense sublattices of a lattice. The framework works by recursively searching for dense sublattices of dense sublattices (or their duals) with progressively lower rank. When the procedure encounters a recursive call on a lattice $L$ with relatively low rank, we simply use a known algorithm to find a shortest non-zero vector in $L$. This new framework is complementary to basis reduction algorithms, which similarly work to reduce an $n$-dimensional lattice problem with some approximation factor $γ$ to a lower-dimensional exact lattice problem in some lower dimension $k$, with a tradeoff between $γ$, $n$, and $k$. Our framework provides an alternative and arguably simpler perspective. For example, our algorithms can be described at a high level without explicitly referencing any specific basis of the lattice, the Gram-Schmidt orthogonalization, or even projection (though, of course, concrete implementations of algorithms in this framework will likely make use of such things). We present a number of instantiations of our framework. Our main concrete result is an efficient reduction that matches the tradeoff achieved by the best-known basis reduction algorithms. This reduction also can be used to find dense sublattices with any rank $\ell$ satisfying $\min\{\ell,n-\ell\} \leq n-k+1$, using only an oracle for SVP in $k$ dimensions, with slightly better parameters than what was known using basis reduction. We also show a simple reduction with the same tradeoff for finding short vectors in quasipolynomial time, and a reduction from finding dense sublattices of a high-dimensional lattice to this problem in lower dimension. Finally, we present an automated search procedure that finds algorithms in this framework that (provably) achieve better approximations with fewer oracle calls. |
| title | Recursive lattice reduction -- A framework for finding short lattice vectors |
| topic | Data Structures and Algorithms |
| url | https://arxiv.org/abs/2311.15064 |