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🔒 UIUCTF 2023 / ✅-crypto-group-projection
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Sutx BOT 06/30/2023 6:47 PM
Group Projection - 500 points
Category: Crypto Description: I gave you an easier project last time. This one is sure to break your grade! nc group-projection.chal.uiuc.tf 1337 Author: Anakin nc hostname 12345 Files:Tags: crypto
06/30/2023 6:47 PM
Sutx pinned a message to this channel. 06/30/2023 6:47 PM
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Sutx BOT 06/30/2023 6:47 PM
@Utaha wants to collaborate 🤝
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sahuang 06/30/2023 6:48 PM
if k == 1 or k == p - 1 or k == (p - 1) // 2: print("[$] I'm not that dumb...") return
18:48
hmmmmm
18:48
another cheese??
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Utaha 06/30/2023 6:48 PM
uh send (p-1)//3 then
18:49
I cannot connect to server somehow
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sahuang 06/30/2023 6:49 PM
would 2*(p-1) work
18:49
havent finished reading code
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Utaha 06/30/2023 6:49 PM
probably
18:49
lmao
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Sutx BOT 06/30/2023 6:49 PM
@kanon wants to collaborate 🤝
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Utaha 06/30/2023 6:50 PM
wait I really can't connect to server
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sahuang 06/30/2023 6:50 PM
maybe its down
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Utaha 06/30/2023 6:51 PM
it's more like a DNS not found error
18:51
anyway
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sahuang 06/30/2023 6:52 PM
i tried
18:52
it works
18:52
2(p-1)
18:52
lmao
18:52
just waiting for nc
18:53
lol they removed the chal
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kanon 06/30/2023 6:53 PM
lol
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Sutx BOT 06/30/2023 7:05 PM
@unpickled admin bot wants to collaborate 🤝
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unpickled admin bot 06/30/2023 7:06 PM
lmao they didnt patch my cheese
19:06
so sad
19:06
no one tell them tho
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sahuang 06/30/2023 7:06 PM
for which
19:06
group project will have a revenge
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unpickled admin bot 06/30/2023 7:06 PM
this ig
19:06
o
19:06
better be fun revenge
19:07
uiuctf{brut3f0rc3_a1n't_s0_b4d_aft3r_all!!11!!} (other chall flag) so btw anyone know what it meant by brute force (edited)
19:07
revenge is prob intended of last so
19:07
¯\_(ツ)_/¯
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Utaha
uh send (p-1)//3 then
sahuang 06/30/2023 9:22 PM
wait, after you send this, you get Bk but how do you get S = pow(Bk, a, p)?
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Utaha 06/30/2023 9:25 PM
order = 3, so only 3 possibilties
21:25
just bruteforce
21:25
oh I assume p % 3 == 1
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sahuang 06/30/2023 9:25 PM
yeah we can get Bk
21:25
a isnt known right
21:25
oh nvm
21:26
3 possibilities it seems?
21:27
yeah
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sahuang
used /ctf submit
Sutx BOT 06/30/2023 9:30 PM
✅ Well done, challenge solved!
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