Tags: crypto
Rating:
[Z3r0 C00l Bruh!]
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Question:
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Hackers keep secrets.
Answer
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1. We are presented a file with the name "hackers.jpeg"
2. After running some diagnostic on it e.g strings, we can see that there is something off with the headers of the file
4. As I've done a lot of stego my self, this is obviously used with steghide, as it presents these headers / hexinfo
5. I unlocked the hints as my bruteforce didn't go as planned in terms of extracting the embedded file
6. After i while, i thought why not try "neverlanctf" for the password of the picture
7. steghide extract -sf hackers.jpeg --passphrase neverlanct
8. Cat the output of the file "Ohno.txt" presents us with the following:
I wonder what this is????
Fowbjcsniuwcwscotsxvevvko
9. Firstly i thought it was base64 (it was not)
10. Secondly i thought it was a caesar cipher / rot 13 (it was not)
11. Thidrdly i thought it was a Viginere cipher
12. It was a Viginere with the password "hackers" (as the hint gave us "what are they")
The result of the decryptet message:
Yourflagismyfavoritemovie
13. Tried first "Yourflagismyfavoritemovie"
14. Tried second "myfavoritemovie"
15. Success!
Comment:
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hint1: Most CTF keys are the name of the CTF but not all.
hint2: What Are they?
Flag:
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Yourflagismyfavoritemovie
myfavoritemovie
