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# A general construction of regular complete permutation polynomials

Dec 2022

Let $r\geq 3$ be a positive integer and $\mathbb{F}_q$ the finite field with$q$ elements. In this paper, we consider the $r$-regular complete permutationproperty of maps with the form $f=\tau\circ\sigma_M\circ\tau^{-1}$ where $\tau$is a PP over an extension field $\mathbb{F}_{q^d}$ and $\sigma_M$ is aninvertible linear map over $\mathbb{F}_{q^d}$. We give a general constructionof $r$-regular PPs for any positive integer $r$. When $\tau$ is additive, wegive a general construction of $r$-regular CPPs for any positive integer $r$.When $\tau$ is not additive, we give many examples of regular CPPs over theextension fields for $r=3,4,5,6,7$ and for arbitrary odd positive integer $r$.These examples are the generalization of the first class of $r$-regular CPPsconstructed by Xu, Zeng and Zhang (Des. Codes Cryptogr. 90, 545-575 (2022)).

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