AlpacaHack Logo

SECCON CTF 13 決勝観戦CTF

CTF is over!
Sign InSign Up
TopChallengesScoreboardWriteups
Beginner & Welcome

Welcome!
100 pts (167 solves)

Author:

minaminao

42

100 pts (40 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

x = bytes_to_long(os.getenv("FLAG").encode())
for _ in range(42):
    x *= getPrime(42)
print(x)

出力:

1147519914005635970823022779519580521609222940350823007699842537827644738629829657046897975782350987748029018405699017377382521676899556171556649128260865812262043303782475632488849236816194782530154901066736272457909268699844626557409460652217501658644287801649083260640392194864370700199619482572398308537257922259125395585581757757644945754520977388691814074631081409677094992839775104691433743609551833747629636402523522392312458111656977789142053773849669780021688811768524291886161405435708715493344047580746854894532523408006689911316576153711061177239836663374119954672786387
descriptionsolveswriteups