3.5
0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | |
S5 | ||||||||||||||||
0 1 2 3 | 2 | 12 | 14 | 1 | 7 | 10 | 11 | 6 | 8 | 5 | 3 | 15 | 13 | 0 | 14 | 9 |
14 | 11 | 2 | 12 | 4 | 7 | 13 | 1 | 5 | 0 | 15 | 10 | 3 | 9 | 8 | 6 | |
4 | 2 | 1 | 11 | 10 | 13 | 7 | 8 | 15 | 9 | 12 | 5 | 6 | 3 | 0 | 14 | |
11 | 8 | 12 | 7 | 1 | 14 | 2 | 13 | 6 | 15 | 0 | 9 | 10 | 4 | 5 | 3 | |
S6 | ||||||||||||||||
0 1 2 3 | 12 | 1 | 10 | 15 | 9 | 2 | 6 | 8 | 0 | 13 | 3 | 4 | 14 | 7 | 5 | 11 |
10 | 15 | 4 | 2 | 7 | 12 | 9 | 5 | 6 | 1 | 13 | 14 | 0 | 11 | 3 | 8 | |
9 | 14 | 15 | 5 | 2 | 8 | 12 | 3 | 7 | 0 | 4 | 10 | 1 | 13 | 11 | 6 | |
4 | 3 | 2 | 12 | 9 | 5 | 15 | 10 | 11 | 14 | 1 | 7 | 6 | 0 | 8 | 13 | |
S7 | ||||||||||||||||
0 1 2 3 | 4 | 11 | 2 | 14 | 15 | 0 | 8 | 13 | 3 | 12 | 9 | 7 | 5 | 10 | 6 | 1 |
13 | 0 | 11 | 7 | 4 | 9 | 1 | 10 | 14 | 3 | 5 | 12 | 2 | 15 | 8 | 6 | |
1 | 4 | 11 | 13 | 12 | 3 | 7 | 14 | 10 | 15 | 6 | 8 | 0 | 5 | 9 | 2 | |
6 | 11 | 13 | 8 | 1 | 4 | 10 | 7 | 9 | 5 | 0 | 15 | 14 | 2 | 3 | 12 | |
S8 | ||||||||||||||||
0 1 2 3 | 13 | 2 | 8 | 4 | 6 | 15 | 11 | 1 | 10 | 9 | 3 | 14 | 5 | 0 | 12 | 7 |
1 | 15 | 13 | 8 | 10 | 3 | 7 | 4 | 12 | 5 | 6 | 11 | 0 | 14 | 9 | 2 | |
7 | 11 | 4 | 1 | 9 | 12 | 14 | 2 | 0 | 6 | 10 | 13 | 15 | 3 | 5 | 8 | |
2 | 1 | 14 | 7 | 4 | 10 | 8 | 13 | 15 | 12 | 9 | 0 | 3 | 5 | 6 | 11 |
Sj (Bj) 6- 4- :
Bj (Bj = b1 b2 b3 b4 b5 b6, bj = 0 1) k. b1 b6 , 3.5;
, , Bj l. b2 b3 b4 b5 , 3.5;
k l.
. , B=011011. S(1)(B)=0101.
ij, k = 1 (b1 b6 = 01(2) = 1(10))
l = 13 (b2 b3 b4 b5 = 1101(2) = 13(10))
13 1 5(10) = 0101(2) . , 011011 0101.
P, 3.6.
3.6 " P"
16 7 20 21
29 12 28 17
1 15 23 26
5 18 31 10
2 8 24 14
32 27 3 9
19 13 30 6
22 11 4 25
Ki .
Ki . 64- 8 , 8, 16, 24, 32, 40, 48, 56, 64.
G, 3.7
3.7-
|
|
G(K) C0 D0 28 . C0 ( ). D0. ϳ C0 D0 Ci Di. , 3.8
3.8 -
ʳ | ʳ | ||
Ci Di. Ki, , 48- 56- ( 3.4)
1
2
16
3.4 - i
.
Ki = H (Ci Di )
H , 3.9
3.9 - H
Ci Di. , , , . , .
, .
, DES . Ki. K16 ¸ K1.
DS . , , 볺 .
DES , .
3.4.1
ECB (Electronic Code Book) DES. 64- (.3.5).
|
3.5 -
. . , , , . .
|
|
3.4.2
, ,
= 1234
S . ϳ , DES. , 64 1.
1 , S.
, , S 1. 64 ( 3.6)
, ,
, . ().
, .
. 3.6 - " "
3.4.3
, 64 . , , , 64 ( 3.7)