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arXiv · 2006.16729

A time-space tradeoff for Lehman's deterministic integer factorization method

Markus Hittmeir
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Abstract

Fermat's well-known factorization algorithm is based on finding a representation of natural numbers $N$ as the difference of squares. In 1895, Lawrence generalized this idea and applied it to multiples $kN$ of the original number. A systematic approach to choose suitable values for $k$ was introduced by Lehman in 1974, which resulted in the first deterministic factorization algorithm considerably faster than trial division. In this paper, we construct a time-space tradeoff for Lawrence's generalization and apply it together with Lehman's result to obtain a deterministic integer factorization algorithm with runtime complexity $O(N^{2/9+o(1)})$. This is the first exponential improvement since the establishment of the $O(N^{1/4+o(1)})$ bound in 1977.

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Markus Hittmeir. 2020-06-30. A time-space tradeoff for Lehman's deterministic integer factorization method. https://doi.org/10.1090/mcom/3623

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