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Weightwise perfectly balanced functions and nonlinearity
Gini, Agnese; Meaux, Pierrick
2022In Codes, Cryptology and Information Security
Peer reviewed
 

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Keywords :
WPB functions; Boolean functions; Mathematical Crypto; Nonlinearity
Abstract :
[en] In this article we realize a general study on the nonlinearity of weightwise perfectly balanced (WPB) <br />functions. First, we derive upper and lower bounds on the nonlinearity from this class of functions for all n. Then, <br />we give a general construction that allows us to provably provide WPB functions with nonlinearity as low as <br />2 <br />n/2−1 <br />and WPB functions with high nonlinearity, at least 2 <br />n−1 − 2 <br />n/2 <br />. We provide concrete examples in 8 and <br />16 variables with high nonlinearity given by this construction. In 8 variables we experimentally obtain functions <br />reaching a nonlinearity of 116 which corresponds to the upper bound of Dobbertin’s conjecture, and it improves <br />upon the maximal nonlinearity of WPB functions recently obtained with genetic algorithms. Finally, we study the <br />distribution of nonlinearity over the set of WPB functions. We examine the exact distribution for n = 4 and provide <br />an algorithm to estimate the distributions for n = 8 and 16, together with the results of our experimental studies for <br />n = 8 and 16.
Disciplines :
Computer science
Mathematics
Author, co-author :
Gini, Agnese  ;  University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > PI Coron
Meaux, Pierrick  ;  University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > PI Coron
External co-authors :
no
Language :
English
Title :
Weightwise perfectly balanced functions and nonlinearity
Publication date :
2022
Event name :
Codes, Cryptology and Information Security: 4th International Conference
Event place :
Rabat, Morocco
Event date :
from 29-05-2023 to 31-05-2023
Main work title :
Codes, Cryptology and Information Security
Publisher :
Springer
ISBN/EAN :
978-3-031-33016-2
Pages :
338--359
Peer reviewed :
Peer reviewed
Focus Area :
Security, Reliability and Trust
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since 02 January 2023

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