Revisiting Impossible Differential Distinguishers of Two Generalized Feistel Structures

Table 2

Notations used in this paper.

	XOR operation
	Two vectors make XOR operation, i.e.,
	Composition of function and , i.e.,
	The -th column of matrix
	-Dimension zero vector
	Uncertain -dimension difference value
	Only the -th element of vector is nonzero and the others are zero
	The -th element of vector is zero and the others are arbitrary values
	The output difference of when the given input difference is