:
. . . .
. , ( ) .
, , "", "" . , . , .
, . , "" , - .
:
3. .
, . . , , .
4. .
, "", .
1. .
().
2. .
, ("") , , (""), .
, , . , , , "" . .
, , :
3.
(, , ) , , .
4.
. .
|
|
: , . , (, ) , , . (, , , MP3, JPEG 2-4% ).
:
3. .
. . , , . .
4.
( 4-32). . .
:
, , , . , .
, . , .
:
.1.
, , . . Vi , . F . , , (. round) . K 8 32. , . , , , - , 4-8, . , ( , ) .
, ? , . , F , . , F-1.
|
|
, , . XOR, , , Vi. , . , ( XOR ) , , Vi , .
, . " EnCrypt DeCrypt". , , - , .2, , . 2. , 3. , . , , - ( ) .
.2.
. , (128 ) 64 . , 32 . 4- . 4. ( ) , "type-2" "type-3". 4 4.
, . ( whitening) . , " " . , , , 95% F Vi . .
.3.
.4.
9. AES: c c 2000 . AES
:
1998 XXI . Rijndael. - .
80- DES (Data Encryption Standard), . : 1) 56 , , 2) , , (, ).
|
|
NIST National Institute of Standards & Technology 1997 . -, . , , AES Advanced Encryption Standard, - 10-20 .
, AES 1998 , :
1. ,
2. ,
3. 128 , : 128, 192 256 .
:
1. , ( ), ( ),
2. 32- ,
3. , , - .
15 . 2 , , , 5 , "" .
(asm, 200) | |||
MARS | IBM | US | 8 / |
RC6 | R.Rivest & Co | US | 12 / |
Rijndael | V.Rijmen & J.Daemen | BE | 7 / |
Serpent | Universities | IS, UK, NO | 2 / |
TwoFish | B.Schneier & Co | US | 11 / |
.
2 2000 NIST RIJNDAEL. - - .
10.
, . " " , .
"" , , , - .
. , , . , :
1. ,
2.
3. .
.