WebInitial Permutation IP • first step of the data computation • IP reorders the input data bits • even bits to LH half, odd bits to RH half • quite regular in structure (easy in h/w ) • … WebInitial Permutation IP first. step of the data computation IP reorders the input data bits even bits to LH half, odd bits to RH half quite regular in structure (easy in h/w) example: …

Cryptography and Network Security 4/e - University of North Florida

http://bit.kuas.edu.tw/~csshieh/teach/97B/is/note1/chap03.ppt Web– 16th round with SK1 undoes 1st encrypt round – then final FP undoes initial encryption IP – thus recovering original data value BITS Pilani, Pilani Campus DES Example BITS … slytherin scarf hot topic

Modern was eventually accepted as the DES

WebInitial Permutation IP • first step of the data computation • IP reorders the input data bits • quite regular in structure – see text Table 3.2 • example: IP(675a6967 5e5a6b5a) = … WebIP(675a6967 5e5a6b5a) = (ffb2194d 004df6fb) • Cấu tạo một vòng của DES Sử dụng hai nửa 32 bít trái và 32 bít phải. Như đối với mọi mã Fiestel, nửa phải của vòng trước được … WebIP(675a6967 5e5a6b5a) = (ffb2194d 004df6fb) The initial permutation and its inverse are defined by tables, as shown in Stallings Tables 3 and 3, respectively. The tables are to … slytherin scarf crochet pattern