Tìm hiểu Các giải thuật mã hóa thông tin

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.KÖÝLWDÑRKRDÛQYÔ
L
1
=Ro
Ro
+
F
+
F
+
F
³DÝRNKÖÝLWDÑRKRÛDQYÔ
2XWSXW
Lo
R
1
= Lo + F(R
1
,K
1
)
L
15
= R
14

R
2
= L
1
+ F(R
1
,K
2
)L
2
= R
1
R
15
= L
14
+ F(R
14
,K
15
)
+
F
R
16
= L
15
+ F(R
15
,K

16
)
L
16
= R
15
1,2,3,... 64
1,2,3,... 64
1,2,3,... 32
K
1
K
2
Kn
K
16
Hình 1:
Encryption computation
1,2,3,... 32
&KRÑQKRÛDQYÔ
/HIW6KLIW /HIW6KLIW
/HIW6KLIW/HIW6KLIW
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&KRÑQKRÛDQYÔ
&KRÑQKRDÛQYÔ
&KRÑQKRDÛQYÔ
1,2,3,..... 64
1,2,3,..... 28 1,2,3,..... 28
K
1

Kn
K
16
+ÎQK
Key Schedule Calculation
Key
Key Key
C
1
D
1
Cn Dn
C
16
D
16
S
1
S
2
S
3
S
6
S
5
S
7
S
4

S
8
P
32 bits
+
E
48 bits
K (
48 bits
)
5
ELWV
Hình 3
: Calculation of f(R,K)
6
4
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
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