November 2019
Beginner to intermediate
408 pages
9h 29m
Korean
Content preview from 밑바닥부터 시작하는 비트코인
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밑바닥부터 시작하는 비트코인
46
여기서 -
f
9
(=
10
)은
9
의 역원이므로,
9
+
f
10
=
0
확실히
10
은
9
의 덧셈에 대한 역원임을 알 수 있습니다.
비슷하게 유한체에서의 뺄셈도 정의할 수 있습니다.
a
-
f
b
= (
a
-
b
)
%
p
여기서
a
,
b
∈
F
p
입니다.
F
19
에서 예를 들면 다음과 같습니다.
11
-
f
9
=(
11
-
9
)
%
19
=
2
6
-
f
13
=(
6
-
13
)
%
19
=
12
연습문제
1.2
유한체
F
57
에서 다음 연산의 결과를 구하시오.
•
44
+
f
33
•
9
-
f
29
•
17
+
f
42
+
f
49
•
52
-
f
30
-
f
38
1.5.1
파이썬으로 유한체 덧셈과 뺄셈 코딩하기
FieldElement
클래스에서
__
add
__
와
__
sub
__
메서드를 정의할 수 있습니다. 이 메서드를 통
해 아래와 같은 파이썬 명령을 실행할 수 있습니다.
>>> from ecc import FieldElement
>>> a = FieldElement(7, 13)
>>> b = FieldElement(12, 13)
>>> c = FieldElement(6, 13)
1
장
유한체
47
>>> print(a+
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.