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🔒 CrewCTF 2023 / ✅-crypto-sspasswd
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Sutx BOT 07/08/2023 10:00 AM
sspasswd - 1000 points
Category: Crypto Description: I could not memorize shares. So I embeds memorable passwords to shares… Author : kiona Files:Tags: No tags.
07/08/2023 10:00 AM
Sutx pinned a message to this channel. 07/08/2023 10:00 AM
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Sutx BOT 07/08/2023 10:01 AM
@layka_ wants to collaborate 🤝
10:04
@Aptx wants to collaborate 🤝
10:07
@kanon wants to collaborate 🤝
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Aptx 07/08/2023 10:08 AM
assert evalpoly(pollst, p, 0) == int.from_bytes(FLAG, 'big') lol how is this possible
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layka_ 07/08/2023 10:10 AM
the constant is the flag
10:11
flag is the secret share
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Aptx 07/08/2023 10:11 AM
evalpoly(pollst, p, 0) will always be 0
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layka_ 07/08/2023 10:13 AM
isn't P(x) = s + a_1 X + a_2 X^2 + ... so P(0) = s (edited)
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Aptx 07/08/2023 10:15 AM
Hmmm yeah, i forgot 0^0 😅
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layka_ 07/08/2023 10:15 AM
Image attachment
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Sutx BOT 07/08/2023 10:36 AM
@Utaha wants to collaborate 🤝
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Utaha 07/08/2023 10:39 AM
uh LLL for the win lol
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Aptx 07/08/2023 10:52 AM
LLL with enumeration
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sahuang 07/08/2023 1:31 PM
anyone trying (i cant LLL tho 🥲
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Utaha 07/08/2023 2:00 PM
if noone i’ll do it when i get back home
goodluck 1
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sahuang 07/08/2023 5:28 PM
oh SEE blooded
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Utaha 07/08/2023 7:27 PM
oh god the enumeration part is killing me
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Utaha 07/08/2023 7:38 PM
probably gonna take an hour or so lol
19:40
da = 193435485668562880 db = 193279633825594140 a = 19807040628575736887448851725 b = 25385761337612901528236265994
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sahuang 07/08/2023 8:32 PM
ok can i help to run anything 🤣 back home
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Utaha 07/08/2023 8:40 PM
uh lemme try to make you run half of it
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sahuang 07/08/2023 8:41 PM
didnt finish after an hour?
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Utaha 07/08/2023 8:42 PM
I made an mistake lol
20:42
re run it rn
20:42
server.py
1.48 KB
20:42
use this number: a = 24754796682811136050061463485 b = 30329530962486867087462809149
20:43
it's kinda like the one line crypto
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sahuang 07/08/2023 8:43 PM
oh
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Utaha 07/08/2023 8:43 PM
now it prints a when the first two characters change
20:44
as a progress bar
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sahuang 07/08/2023 8:45 PM
if all(64 <= x <= 122 for x in apw + bpw) why 64 and 122?
20:45
doesnt include flag format ig?
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sahuang
if all(64 <= x <= 122 for x in apw + bpw) why 64 and 122?
Utaha 07/08/2023 8:45 PM
PWCHARSET range?
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sahuang 07/08/2023 8:46 PM
oh PWCHARSET
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Utaha 07/08/2023 8:46 PM
we are not bruting the flag btw
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sahuang 07/08/2023 8:46 PM
yeah
20:46
i just checked source lol
20:46
yeah bruting pwd
20:52
how long it takes roughly
20:53
i think someone else may need to run, my PC dying in 30 min due to no battery 😂
20:53
@kanon
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Utaha
Click to see attachment 🖼️
kanon 07/08/2023 8:55 PM
do I just run this code?
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Utaha 07/08/2023 8:55 PM
got it
20:55
b'Mus@H_rOom' b'_cOcKt__aIL@'
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sahuang 07/08/2023 8:55 PM
oh
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kanon 07/08/2023 8:55 PM
oh
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Utaha 07/08/2023 8:55 PM
oh shoot the underscore got killed
20:55
anyway
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sahuang 07/08/2023 8:56 PM
lucky enough msfrog
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sahuang
how long it takes roughly
Utaha 07/08/2023 8:56 PM
honestly idk
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sahuang 07/08/2023 8:57 PM
ok
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Utaha
used /ctf solve
Sutx BOT 07/08/2023 9:00 PM
✅ Challenge solved.
Exported 54 message(s)