По таблице 2 видно, что биты 1, 4, 5, 8, 9, 12, 13, 16, 17, 20, 21, 24, 25, 28, 29, 32 дублируются, и делается перестановка.
2) E и раундовый ключ ki(48 бит-генерация раундовых ключей показана ниже) складываются по модулю 2.
3) полученный 48 битный блок данных делится на 8, получаются 8-мь 6 битных блоков (Bj).
- каждый 6 битный блок Bj преобразуется (Sj -блоком) в 4 битный блок.
Таблица 3. Преобразования Si, i=1…8
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0
|
1
|
2
|
3
|
4
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5
|
6
|
7
|
8
|
9
|
10
|
11
|
12
|
13
|
14
|
15
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
0
|
14
|
4
|
13
|
1
|
2
|
15
|
11
|
8
|
3
|
10
|
6
|
12
|
5
|
9
|
0
|
7
|
|
1
|
0
|
15
|
7
|
4
|
14
|
2
|
13
|
1
|
10
|
6
|
12
|
11
|
9
|
5
|
3
|
8
|
S1
|
2
|
4
|
1
|
14
|
8
|
13
|
6
|
2
|
11
|
15
|
12
|
9
|
7
|
3
|
10
|
5
|
0
|
|
3
|
15
|
12
|
8
|
2
|
4
|
9
|
1
|
7
|
5
|
11
|
3
|
14
|
10
|
0
|
6
|
13
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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0
|
15
|
1
|
8
|
14
|
6
|
11
|
3
|
4
|
9
|
7
|
2
|
13
|
12
|
0
|
5
|
10
|
|
1
|
3
|
13
|
4
|
7
|
15
|
2
|
8
|
14
|
12
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0
|
1
|
10
|
6
|
9
|
11
|
5
|
S2
|
2
|
0
|
14
|
7
|
11
|
10
|
4
|
13
|
1
|
5
|
8
|
12
|
6
|
9
|
3
|
2
|
15
|
|
3
|
13
|
8
|
10
|
1
|
3
|
15
|
4
|
2
|
11
|
6
|
7
|
12
|
0
|
5
|
14
|
9
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
0
|
10
|
0
|
9
|
14
|
6
|
3
|
15
|
5
|
1
|
13
|
12
|
7
|
11
|
4
|
2
|
8
|
|
1
|
13
|
7
|
0
|
9
|
3
|
4
|
6
|
10
|
2
|
8
|
5
|
14
|
12
|
11
|
15
|
1
|
S3
|
2
|
13
|
6
|
4
|
9
|
8
|
15
|
3
|
0
|
11
|
1
|
2
|
12
|
5
|
10
|
14
|
7
|
|
3
|
1
|
10
|
13
|
0
|
6
|
9
|
8
|
7
|
4
|
15
|
14
|
3
|
11
|
5
|
2
|
12
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
0
|
7
|
13
|
14
|
3
|
0
|
6
|
9
|
10
|
1
|
2
|
8
|
5
|
11
|
12
|
4
|
15
|
|
1
|
13
|
8
|
11
|
5
|
6
|
15
|
0
|
3
|
4
|
7
|
2
|
12
|
1
|
10
|
14
|
9
|
S4
|
2
|
10
|
6
|
9
|
0
|
12
|
11
|
7
|
13
|
15
|
1
|
3
|
14
|
5
|
2
|
8
|
4
|
|
3
|
3
|
15
|
0
|
6
|
10
|
1
|
13
|
8
|
9
|
4
|
5
|
11
|
12
|
7
|
2
|
14
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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0
|
2
|
12
|
4
|
1
|
7
|
10
|
11
|
6
|
8
|
5
|
3
|
15
|
13
|
0
|
14
|
9
|
|
1
|
14
|
11
|
2
|
12
|
4
|
7
|
13
|
1
|
5
|
0
|
15
|
10
|
3
|
9
|
8
|
6
|
S5
|
2
|
4
|
2
|
1
|
11
|
10
|
13
|
7
|
8
|
15
|
9
|
12
|
5
|
6
|
3
|
0
|
14
|
|
3
|
11
|
8
|
12
|
7
|
1
|
14
|
2
|
13
|
6
|
15
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0
|
9
|
10
|
4
|
5
|
3
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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0
|
12
|
1
|
10
|
15
|
9
|
2
|
6
|
8
|
0
|
13
|
3
|
4
|
14
|
7
|
5
|
11
|
|
1
|
10
|
15
|
4
|
2
|
7
|
12
|
9
|
5
|
6
|
1
|
13
|
14
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0
|
11
|
3
|
8
|
S6
|
2
|
9
|
14
|
15
|
5
|
2
|
8
|
12
|
3
|
7
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0
|
4
|
10
|
1
|
13
|
11
|
6
|
|
3
|
4
|
3
|
2
|
12
|
9
|
5
|
15
|
10
|
11
|
14
|
1
|
7
|
6
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0
|
8
|
13
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0
|
4
|
11
|
2
|
14
|
15
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0
|
8
|
13
|
3
|
12
|
9
|
7
|
5
|
10
|
6
|
1
|
|
1
|
13
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0
|
11
|
7
|
4
|
9
|
1
|
10
|
14
|
3
|
5
|
12
|
2
|
15
|
8
|
6
|
S7
|
2
|
1
|
4
|
11
|
13
|
12
|
3
|
7
|
14
|
10
|
15
|
6
|
8
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0
|
5
|
9
|
2
|
|
3
|
6
|
11
|
13
|
8
|
1
|
4
|
10
|
7
|
9
|
5
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0
|
15
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14
|
2
|
3
|
12
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0
|
13
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2
|
8
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4
|
6
|
15
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11
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1
|
10
|
9
|
3
|
14
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5
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0
|
12
|
7
|
|
1
|
1
|
15
|
13
|
8
|
10
|
3
|
7
|
4
|
12
|
5
|
6
|
11
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0
|
14
|
9
|
2
|
S8
|
2
|
7
|
11
|
4
|
1
|
9
|
12
|
14
|
2
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0
|
6
|
10
|
13
|
15
|
3
|
5
|
8
|
|
3
|
2
|
1
|
14
|
7
|
4
|
10
|
8
|
13
|
15
|
12
|
9
|
0
|
3
|
5
|
6
|
11
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