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Group Theory
:
Calculate
CryptICS
Take elliptic curve E: y
2
≡ x
3
+ 5x + 21 over
ℤ
23
Next
Reciprocal value table, if needed
x
1
2
3
4
5
6
7
8
9
10
x
-1
mod 23
1
12
8
6
14
4
10
3
18
7
x
11
12
13
14
15
16
17
18
19
20
x
-1
mod 23
21
2
16
5
20
13
19
9
17
15
x
21
x
-1
mod 23
11