November 2019
Beginner to intermediate
408 pages
9h 29m
Korean
Content preview from 밑바닥부터 시작하는 비트코인
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3
장
타원곡선 암호
93
연습문제
3.4
F
223
에서 정의된 곡선
y
2
=
x
3
+
7
에서 다음의 스칼라 곱셈을 구하시오.
•
2
•
(
192
,
105
)
•
2
•
(
143
,
98
)
•
2
•
(
47
,
71
)
•
4
•
(
47
,
71
)
•
8
•
(
47
,
71
)
•
21
•
(
47
,
71
)
3.7
스칼라 곱셈 특징
스칼라 곱셈은 한 점을 수회 반복해서 더하는 연산입니다. 공개키 암호 기법에 스칼라 곱셈이
활용되는 이유는 타원곡선에서 스칼라 곱셈 역산이 어렵기 때문입니다. 앞 예제 중에서 한 가
지를 살펴보겠습니다.
s
가
1
부터
22
까지 변할 때
F
223
에서
s
•
(
47
,
71
)을 계산해보겠습니다.
>>> from ecc import FieldElement, Point
>>> prime = 223
>>> a = FieldElement(0, prime)
>>> b = FieldElement(7, prime)
>>> x = FieldElement(47, prime)
>>> y = FieldElement(71, prime)
>>> p = Point(x, y, a, b)
>>> for s in range(1,21):
... result = s*p
... print('{}*(47,71)=({},{})'.format(s,result.x.num,result.y.num))
1*(47,71)=(47,71)
2*(47,71)=(36,111 ...
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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.