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SECCON CTF 13 決勝観戦CTF

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Beginner & Welcome

Welcome!
100 pts (167 solves)

Author:

minaminao

Beginner & Crypto
100 pts (152 solves)

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Beginner & Web
100 pts (139 solves)

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Rev & Beginner
100 pts (121 solves)

Author:

Beginner & Misc
100 pts (89 solves)

Author:

Beginner & Pwn
100 pts (31 solves)

Author:

Pwn
100 pts (75 solves)

Author:

100 pts (78 solves)

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100 pts (21 solves)

Author:

100 pts (6 solves)

Author:

Crypto
100 pts (40 solves)

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100 pts (81 solves)

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100 pts (10 solves)

Author:

100 pts (11 solves)

Author:

Rev
100 pts (38 solves)

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100 pts (10 solves)

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100 pts (3 solves)

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Web
100 pts (8 solves)

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100 pts (15 solves)

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100 pts (6 solves)

Author:

Misc
100 pts (19 solves)

Author:

trippple

100 pts (81 solves)
Crypto

Author:

minaminao

出力からフラグを復元してください🐍

import os
from Crypto.Util.number import getPrime, bytes_to_long

m = bytes_to_long(os.getenv("FLAG").encode())
p = getPrime(96)
n = p * p * p
e = 65537
c = pow(m, e, n)

print(f"{n,c=}")

出力:

n,c=(272361880253535445317143279209232620259509770172080133049487958853930525983846305005657, 69147423377323669983172806367084358432369489877851180970277804462365354019444586165184)
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