Impossible Differential Distinguishers of Two Generalized Feistel Structures

Table 1

Symbols.

	XOR operation
	The XOR difference of and
	The number of nonzero components of vector
	The output difference of when the given input difference is
	Matrices concatenation
	Composition of function and , i.e.,
	The -th column of matrix
	Vector with nonzero values only in the -th components
	-dimension zero vector
	Uncertain difference