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suffron

Type
CTF
๋…„๋„
2025
Name
Nowruz 1404
๋ถ„์•ผ
Rev
์„ธ๋ถ€๋ถ„์•ผ
MISC
์—ด
2025/03/20 06:15
1 more property

# Description

what time(stamp) is it?
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# ๋ถ„์„

chall.pyc ํŒŒ์ผ์„ ์ค€๋‹ค.
pyc๋Š” ์ปดํŒŒ์ผ ๋œ ๋‚ด์šฉ์ž„์œผ๋กœ pyc online decompiler์—์„œ ๋””์ปดํŒŒ์ผํ•ด์„œ ์†Œ์Šค์ฝ”๋“œ๋ฅผ ์ถ”์ถœํ•ฉ๋‹ˆ๋‹ค.
chall.py
๋Œ€์ถฉ ์ฝ”๋“œ๋ฅผ ์ฝ์–ด๋ณด๋ฉด seed๋ฅผ time.time()์„ ํ†ตํ•ด์„œ ์ƒ์„ฑํ•˜๊ณ 
random.seed(seed)๋ฅผ ๋„ฃ์–ด์ค€๋‹ค.
์ฆ‰ seed๋งŒ ์•Œ ์ˆ˜ ์žˆ์œผ๋ฉด ์›๋ณธ Flag๋ฅผ ๋ณต๊ตฌํ•  ์ˆ˜ ์žˆ๋‹ค.
seed๋Š” time.time()์—์„œ ํ˜„์žฌ ์‹œ๊ฐ„์„ ๊ฐ€์ ธ์˜ค๊ธฐ ๋•Œ๋ฌธ์— ์ง€๊ธˆ ์‹œ๊ฐ„์„ ๊ธฐ์ค€์œผ๋กœ -1์”ฉ ํ•˜๋ฉด์„œ ์ฐพ์œผ๋ฉด ๋‚˜์˜จ๋‹ค.

# Payload

# Decompiled with PyLingual (https://pylingual.io) # Internal filename: ./chall.py # Bytecode version: 3.13.0rc3 (3571) # Source timestamp: 2025-03-15 15:42:49 UTC (1742053369) import random import time seed = int(time.time()) while True: seed -= 1 print(seed) flag = list('o1me0T3}h_hTuvar_M4vdCFF3__{l3TY') random.seed(seed) random.shuffle(flag) flag = ''.join(flag) if flag.startswith('FMCTF'): print(f'flag = {flag}') break
Python
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# Flag

FMCTF{0h_You_h4v3_Trav3led_T1m3}
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