Last active
July 10, 2023 06:29
-
-
Save elliptic-shiho/cfd56e9dd47c7f2041157ffb6bb7477c to your computer and use it in GitHub Desktop.
Crypto CTF 2023: Risk (last phase only)
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
from sage.all import * | |
from Crypto.Util.number import long_to_bytes | |
A = 6737149052150272134972940516590980024331491319339741317342183169802474656888386084365871287308045730462954100927849817850868865189752921007067826413968051476282853264469660023301658697080152738648906257793188559177506701773637608811467111764155767760049813836531589499517889064750007039677591074035963533567 | |
q = 15040222622096320078383580808680733765955114958694997949647342925417877088612792495485641348591026281373930569798925789027166056695954731923306109646611840570310396750856642056018981080439916663195842593441587057719678555907050674529272376248049062724657792390788687452049496308886252188791975094655675938807 | |
F = GF(q) | |
PR.<x> = F[x] | |
l = (x ^ 6 - A).roots() | |
for a, b in l: | |
print(long_to_bytes(ZZ(a))) |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sun Jul 9 16:46:32 JST 2023 ~/Downloads/risk | |
> time sage solve.sage | |
b'\x15k\x01B<\xba\xbe\xd4\x96\xc9\xb4\xd9W\xc0f\xa0zH\xbd\x95v\x16\xb3\x92\xba\\\x15\x95)$\xce\xff/\xd6\xd2"\xbd\x98\xeb\xda\x91\n\xd6\xcap\rr\xb7\xfa\x12\xb6b\xe4ti\xd7\xad\xcc\xc3\xb4\xd3{\xbe\xf0a\xfd77\xd3\x11OO\xc7L\x1e\xc7b\x14\x17\xe5\x81p\xce\xb4\x85%\xa5Q%\xb0\x01D\x1e/\xe6:\x0f>\xe8\x16\x1f67]\x9ah\t\xe9&\xe7\x1d\xa1H\xf0\\\xccs\x9ej\xb9\x92\xdd\xe2c\x089\x16z' | |
b'\x14\x96\x97\x9f\xeb\x0b\xbd\xe2\xd4\x82}\x7f\x00F\xcd\x13\xbd01&\xf8\x19\xd0I\xb8|bl+\x98+F\x98\xff:\x8f\xf5\xb2\x88\xfe\xd0T\xab\x05\xa7\xde/\xb2\x12\xe0\x01\x9e\xebK\t\xe6#Q\xa5\x92\xbf}\xf92\xa01X\x96\x10A\xd9\xbb[oh\x12\xd5#\xc5r\x1fn\xc3l\xcbIGi\xd1[\x86u"\xaf\tB\xdaY{\x9b-\x95\xf8-\xbf\xb31fZ\xc3$\x1ds(\xb9g\x05\xcbj*\x7fwo\xae\\\xbd\x7fi' | |
b'\x14\x96\x97\x9f\xeb\x0b\xbd\xe2\xd4\x82}\x7f\x00F\xcd\x13\xbd01&\xf8\x19\xd0I\xb8|bl+\x98+F\x98\xff:\x8f\xf5\xb2\x88\xfe\xd0T\xab\x05\xa7\xde/\xb2\x12\xe0\x01\x9e\xebK\t\xe6#Q\xa5\x92\xbf}\xf92\xa01X\x96\x10A\xd9\xbb[og\xcf\x91\xcf~\xf6\xccMV\x1c\x9a\x03\xe8(\x99\xe7R\x11\xd7O\xd8\xd4{\x06\x0bU\xcad\x96\xe1\x92}\xbc\xf3\xe5_\xcf\xa8\x00\xf5u\x07\xb3x(\xcb\x0f%>@\xf7\x88]\xec' | |
b'\xd4i\xa2Q\xaf\x00\xf1\xc2G7ZWy\x99\x8c\xbd\x18\x8cn}\xfc\xe3I\x01\xdf\xb3(\xfd\x8c\xa3\xb8\x96\xd7\x97\x92\xc7\xe6b\xdb\xc0\xb6+\xc4\xc8/C\x05\xe72\xb4\xc3\xf9)_\xf1\x8a{\x1e"\x13\xfd\xc5\xbd\xc1\xcb\xde\xa1\xc2\xcfu\x94k\xdc\xb7;\x13\x98\xdfj\x08D\xe5\xe8\x1cg\x1ci\xc3<\xe3\x95\x92?=\xd3\xf3\x8cM\x05\xb8\x03\x01\xc85\x1f\xc1g\xb6\xea\xa2n\xba.,$\x12y\x83M\xf4\n\xd5\x8fu\xe5\xda\x0b' | |
b'\xd4i\xa2Q\xaf\x00\xf1\xc2G7ZWy\x99\x8c\xbd\x18\x8cn}\xfc\xe3I\x01\xdf\xb3(\xfd\x8c\xa3\xb8\x96\xd7\x97\x92\xc7\xe6b\xdb\xc0\xb6+\xc4\xc8/C\x05\xe72\xb4\xc3\xf9)_\xf1\x8a{\x1e"\x13\xfd\xc5\xbd\xc1\xcb\xde\xa1\xc2\xcfu\x94k\xdc\xb6\xf7\xd0D\x98\xee\xb5#x\x97\xeb!\xbd(\x8b\xc8\xaf2F\xe0\re\x948\xdc\xc0T\xd1\xa0|\x07\xeaL\xf5A\x87M\xf9G\xfa\xe7\xc4\xc0&A\xee\x83\xb8\xa4"\x10\xb0\xb8\x8e' | |
b'CCTF{S!mP1E_A7t4cK_0n_SpEc1aL-5trucTur3D_RSA_pR1me5!}' | |
real 0m6.584s | |
user 0m6.354s | |
sys 0m0.236s |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Writeup: https://shiho-elliptic.tumblr.com/post/722391959624433664/crypto-ctf-2023-writeup-en