34. 1,2,3,... 64
Input
.KÖÝLWDÑRKRDÛQYÔ
1,2,3,... 32 1,2,3,... 32
Lo Ro
K1
+ F
L 1 =Ro R 1 = Lo + F(R 1 ,K 1 )
K2
+ F
L 2 = R1 R 2 = L 1 + F(R 1 ,K 2 )
Kn
+ F
L 15 = R 1 4 R 15 = L 14 + F(R 1 4,K 1 5 )
K 16
+ F
R 16 = L 15 + F(R 1 5,K 1 6 ) L 16 = R 1 5
³DÝRNKÖÝLWDÑRKRÛDQYÔ
2XWSXW
1,2,3,... 64
Hình 1: Encryption computation
209. T@
PHVVDJHNKRÄQJEÔFKHGDÃXv
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U TUU
UP TPUPUP
UP TPUP
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213. FRÛPRÆWOÖÚLJLDÝLGXQKDÃW
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WR W
W
T QRER@
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215. WR W
W WHPS
QR ER
ER U
T QRER@
U QRxTER
LIER!WKHQ
EKDVQRLQYHUVHPRGXORQ
HOVHE WPRGQ
*LDÝLWKXDÆW0LOOHUx5DELQNLHÇPWUDVRÃQJXHÄQWRÃOHÝ
:ULWHQ NP ZKHUHPLVRGG
KRVHDUDQGRPLQWHJHUD D Q