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밑바닥부터 시작하는 비트코인
book

밑바닥부터 시작하는 비트코인

by 류정필, 송재준
November 2019
Beginner to intermediate
408 pages
9h 29m
Korean
Hanbit Media, Inc.
Content preview from 밑바닥부터 시작하는 비트코인
밑바닥부터 시작하는 비트코인
116
4
.
s
= (
z
+
re
)/
k
를 계산합니다.
13
5
. 서명은 (
r
,
s
)입니다.
공개키
P
는 검증자에게 보내야 하고
z
또한 검증자가 알아야 합니다. 뒤에서
z
는 계산으로 얻
고
P
는 서명과 함께 전송되는 것을 보게 될 것입니다.
3.12.6
서명 생성 실습
이제 서명을 생성할 수 있습니다.
CAUTION
_
무작위 숫자 생성 시 주의사항
파이썬에서제공하는
random
라이브러리등을사용해서각종암호관련연산에사용하는것은일반적으
로좋은생각이아닙니다.
13
여기서설명하는코드와라이브러리는상용제품적용이아닌학습목적으로
사용하기바랍니다.
해시함수를 사용해서 다음과 같이 서명을 생성할 수 있습니다.
>>> from ecc import S256Point, G, N
>>> from helper import hash256
>>> e = int.from_bytes(hash256(b'my secret'), 'big')
➊
>>> z = int.from_bytes(hash256(b'my message'), 'big')
➋
>>> k = 1234567890
➌
>>> r = (k*G).x.num
➍
>>> k_inv = pow(k, N-2, N)
>>> s = (z+r*e) * k_inv % N
➎
>>> point = e
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Publisher Resources

ISBN: 9791162248294