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The Balloon

// A NahamCon CTF 2022 Challenge...


Hey Hackers! The following is a write up for The Balloon challenge from NahamCon CTF 2022. I will attach a video walk through below in case if you are more of a visual learner.


 
 

// Starting Off:

We are given the following prompt.

it's basically just a deflated balloon - spin it around, _inflate_ it, and the prize is inside! wiieh://ephitqxc.rdb/tAQtEOTn

The encrypted text within the prompt appears to be a link. The text starts with what looks like the HTTPS protocol.

W

I

I

E

H

H

T

T

P

S

Because I see the repeating characters within the same indexes, I assume that the cipher is using the Caesar Cipher. Because the cipher only has 26 possible keys, it s very easy to brute force. I decide to use the Codex Project to break the cipher.


// But_What_Is_It:

Using a shift key of 15, we decrypted the text and found a paste bin link.

We obtain the following RAW paste data.

D0Up0IZUnnnnnnnnnnnnnnnnnnnUU5nnnnnn3SUUnUUUwCiudIbEAtwwwEt33GpDDsGwG03sDDtwtsGpDDtt33333www03333GDfBDKWCkOUYYmCEisKYSeMucMSEUKYEcMSemiYuyeo4

// Inflating The Balloon:

The original prompt tells us to _inflate_, so out of curiosity I search "inflate" in Cyber Chef. I find a RAW Inflate selection and run it on our RAW Pate Data. Cyber Chef inflated the text and got our flag.

Thanks for reading, and as always,


Happy Hacking!


// Socials:

© 2022 by Cosmodium CyberSecurity LLC

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