ĐỒ ÁN TỐT NGHIỆP - TÌM HIỂU LÝ THUYẾT VỀ MẬT MÃ HÓA THÔNG, TIN XÂY DỰNG SEVER TẠO KHÓA CHO USER TRONG VẤN ĐỀ BẢO MẬT DỮ LIỆU potx

ĐỒ ÁN TỐT NGHIỆP - TÌM
HIỂU LÝ THUYẾT VỀ MẬT
MÃ HÓA THÔNG, TIN XÂY
DỰNG SEVER TẠO KHÓA
CHO USER TRONG VẤN ĐỀ
BẢO MẬT
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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:
Encr
y
ption computation
1,2,3, 32

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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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