## Abstract For cryptographic purposes, we want to find functions with both low differential uniformity and dissimilarity to all linear functions and to know when such functions are essentially different. For vectorial Boolean functions, extended affine equivalence and the coarser CarletβCharpinβZi
Planar Functions, Relative Difference Sets, and Character Theory
β Scribed by S.L. Ma
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 192 KB
- Volume
- 185
- Category
- Article
- ISSN
- 0021-8693
No coin nor oath required. For personal study only.
β¦ Synopsis
Planar functions from β«ήβ¬ to β«ήβ¬ are studied in this paper. By investigating the n n character values of the corresponding relative difference sets, we obtain some nonexistence results of planar functions. In particular, we show that there is no planar functions from Z to β«ήβ¬ , where p and q are any primes. We also show p q p q that except for four undecided cases, there is no planar function from β«ήβ¬ to β«ήβ¬ if n n n
is not a prime and n F 50,000.
π SIMILAR VOLUMES
recursively enumerable set but which is not the difference set of any recursive set.
Building sets are a successful tool for constructing semi-regular divisible difference sets and, in particular, semi-regular relative difference sets. In this paper, we present an extension theorem for building sets under simple conditions. Some of the semi-regular relative difference sets obtained
## Abstract We call a group __G__ with subgroups __G__~1~, __G__~2~ such that __G__β=β__G__~1~__G__~2~ and both __N__β=β__G__~1~ββ©β__G__~2~ and __G__~1~ are normal in __G__ a semidirect product with amalgamated subgroup __N__. We show that if __G__~l~ is a group with __N__~l~ββ²β__G__~l~ containing
## Abstract In this article, we introduce what we call twisted Kronecker products of cocycles of finite groups and show that the twisted Kronecker product of two cocycles is a Hadamard cocycle if and only if the two cocycles themselves are Hadamard cocycles. This enables us to generalize some known