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picoCTF/basic_mod2/sol.py
Maxime Vorwerk fe0e1b2411 basic-mod2
2024-07-08 13:46:15 +02:00

21 lines
413 B
Python
Executable File

#!/home/maxime/.pyvenv/bin/python3
with open("message.txt", 'r') as f:
text = f.read().strip()
cipher = text.split(' ')
dec = ""
for i in cipher:
i = int(i)
i %= 41
i = pow(i, -1, 41)
if i <= 26:
dec += chr(ord('a') + i - 1)
elif i <= 36:
dec += chr(ord('0') + i - 27)
elif i == 37:
dec += '_'
print(dec)