翻訳と辞書 Words near each other ・ Pseudo-deltoidal icositetrahedron ・ Pseudo-Democritus ・ Pseudo-Demosthenes ・ Pseudo-determinant ・ Pseudo-differential operator ・ Pseudo-Dionysius the Areopagite ・ Pseudo-documentary ・ Pseudo-Dorotheos of Monemvasia ・ Pseudo-Dorotheus ・ Pseudo-Epiphanios ・ Pseudo-Euclidean space ・ Pseudo-Ezekiel ・ Pseudo-finite field ・ Pseudo-Geber ・ Pseudo-Gregory ・ Pseudo-Hadamard transform ・ Pseudo-Hegesippus ・ Pseudo-Hurler polydystrophy ・ Pseudo-Ingulf ・ Pseudo-intersection ・ Pseudo-Isidorian Decretals ・ Pseudo-Jerome ・ Pseudo-John ・ Pseudo-Kufic ・ Pseudo-Linus ・ Pseudo-LRU ・ Pseudo-Marcellus ・ Pseudo-Mark ・ Pseudo-Martyr ・ Pseudo-Melitus Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Pseudo-Hadamard transform ： ウィキペディア英語版 Pseudo-Hadamard transform The pseudo-Hadamard transform is a reversible transformation of a bit string that provides cryptographic diffusion. See Hadamard transform. The bit string must be of even length, so it can be split into two bit strings ''a'' and ''b'' of equal lengths, each of ''n'' bits. To compute the transform, ''a''' and ''b''', from these we use the equations: :$a\text{'}\; =\; a\; +\; b\; \backslash ,\; \backslash pmod\backslash ,$ :$b\text{'}\; =\; a\; +\; 2b\backslash ,\; \backslash pmod\backslash ,$ To reverse this, clearly: :$b\; =\; b\text{'}\; -\; a\text{'}\; \backslash ,\; \backslash pmod$ :$a\; =\; 2a\text{'}\; -\; b\text{'}\; \backslash ,\; \backslash pmod$ ==Generalisation== The above equations can be expressed in matrix algebra, by considering ''a'' and ''b'' as two elements of a vector, and the transform itself as multiplication by a matrix of the form: : The inverse can then be derived by inverting the matrix. However, the matrix can be generalised to higher dimensions, allowing vectors of any power-of-two size to be transformed, using the following recursive rule: : For example: : 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pseudo-Hadamard transform」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.