Chapter 17

Cryptographic Generalizations of Bent Functions

Abstract

It is known that for a Boolean function to be “good” from the cryptographic point of view it should possess several cryptographic properties. Often such properties contradict each other. The problem of constructing bent functions with stronger cryptographic properties is again considered in this chapter. Here we concentrate on additional restrictions for bent functions that lead to new cryptographic notions (such as balanced bent functions and hyperbent functions) and also on modifications of bent functions by the following principle: “less nonlinearity, stronger other properties” (partially bent functions). We consider semibent functions, balanced (semi-) bent functions, ...

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