November 2019
Beginner to intermediate
408 pages
9h 29m
Korean
Content preview from 밑바닥부터 시작하는 비트코인
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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.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.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.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.
3
장
타원곡선 암호
103
__
add
__
와
__
rmul
__
메서드로 더 복잡한 타원곡선을 정의할 수 있습니다.
3.10
비트코인에서 사용하는 타원곡선
설명하기 쉽게 예를 들기 위해 지금까지 상대적으로 작은 소수를 사용했지만 실전에서는 작은
소수를 사용하지 않습니다. 작은 소수인 경우 전체 군을 컴퓨터로 탐색할 수 있기 때문입니다.
예를 들어 군의 원소 수가
301
개라면 스칼라 곱셈의 역연산 혹은 이산 로그 문제를 풀기 위해
301
번의 계산을 손쉽게 할 수 있습니다.
그러나 소수가 아주 크다면 어떨까요? 지금까지 사용한 것보다 더 큰 소수를 얼마든지 선택할
수 있습니다. 컴퓨터가 계산해도 확인할 수 없는 군의 원소들이 많으면 타원곡선 암호의 보안
성이 높아집니다.
공개키 암호를 위한 타원곡선은 다음 매개변수로 정의됩니다.
• 곡선
y
2
=
x
3
+
ax
+
b
에서
a
와
b
• 유한체의 위수인 소수
p
• 생성점
G
의
x
와
y
좌푯값
•
G
로 생성한 군의 위수
n
이러한 숫자는 공개적으로 알려져 있으며 이를 통해 암호화를 위한 곡선을 정하게 됩니다. 보
안과 편의성 사이에 절충점이 다른 많은 곡선들이 있으며 그중에서 비트코인은
secp256k1
곡
선을 사용합니다.
secp256k1
의 매개변수는 다음과 같습니다.
•
a
=
0
,
b
=
7
이며 곡선은
y
2
=
x
3
+
7
이 됩니다.
•
p
=
2
256
-
2
32
-
977
•
G
x
=
0x79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798 ...
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and much more.
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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.