CCTF_Public/challenges/vol9_rnd1/Day1/05_Mazlos/mazlos.sage

19 lines
394 B
Python
Raw Normal View History

2022-08-25 20:04:04 +00:00
#!/usr/bin/env sage
from Crypto.Util.number import *
from secret import x, liar, flag
p = 2 ** 160 - 229233
E = EllipticCurve(GF(p), [313, 110])
m = bytes_to_long(flag.lstrip(b'CCTF{').rstrip(b'}'))
assert m < p
P = E((x, 348211368764139637940513065884307924565894663368))
Q = m * P
print(f'Q = ({Q.xy()[0]}, ?)')
for _ in liar:
a, b = _
print(f'{a} * P + {b} * Q = {(a*P + b*Q).xy()}')