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126 Chapter 4. Efficient characterizations for bentnessThe implementation 11 was ma<strong>de</strong> using Sage [250] and Cython [24], performing direct calls toGivaro [74], NTL [241] and gf2x [26] libraries for efficient manipulation of finite field elementsand construction of Boolean functions.In Table 4.4 we give the results of the computations we conducted along with different piecesof information about them. One should remark that all the Boolean functions which couldbe tested are bent. Evi<strong>de</strong>nce that our computations were correct is given by the fact thatTable 4.4: Test of bentness for m evenm Nb. of cyclotomic classes Time All bent?4 1

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