Intro
As promised, we are publishing our tasks from recent CTF hosted during PUT Security Day vol. 0!
Stegano
Stegano seal [100]
“You have been visited by a stegano seal. It brings you joy (and points).”
Art Gallery [150]
“Do you like the art?”
Relativity [200]
There’s something weird about the recording we’ve received.
Once you got the message, wrap it with PUT{ and }, and make it uppercase (e.g. if the message was “example”, the flag would look like PUT{EXAMPLE}).
(Actually the challenge falls into stegano/crypto category)
PNG wildcat
I bet he holds some kind of a secret
RE
TBA
Misc
Sanity Check [5]
HACK THE PLANET! ofc :)
QR text [50]
What’s wrong with that file?!
HINT: Try inverting things..
Galactiv Noise [150]
We’ve never heard that… WTH?!
Probably you want to ask Scotie ;)
Msg from our intelligence
We have received a message from one of our best agents.
Can you help us decipher it?
Crypto
SingleByte [80]
Somewhere in the middle - there is a flag…
HINT: how about XOR?
SimpleCrypt [100]
EzRSA [200]
n = 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
e = 3
d = 10158842775944441879845412522073645913593431921496039304017563009015613000152961953010735286029351465992156858265490011638069859459408299210172354146587934259469618944647452912521483719003264592154023983871077
What now?
Back to the future [250]
Our agency not only uses bulletproof crypto, but also steals secrets from the future. Unfortunately we cannot decrypt the message. Can you help us?