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On the bijectivity of the map $\chi$
Feb. 9, 2024, 3:42 a.m. |
IACR News www.iacr.org
ePrint Report: On the bijectivity of the map $\chi$
Anna-Maurin Graner, Björn Kriepke, Lucas Krompholz, Gohar M. Kyureghyan
We prove that for $n>1$ the map $\chi:\mathbb{F}_q^n \to \mathbb{F}_q^n$, defined by $y=\chi(x)$ with $y_i = x_i + x_{i+2}\cdot(1+x_{i+1})$ for $1\leq i \leq n$, is bijective if and only if
$q=2$ and $n$ is odd, as it was conjectured by Schoone and Daemen in 2023.
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