QmFzZTY0

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file.txt

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Category: Cryptography - Points: 500 (at the beginning) then 10 (at the end) - Solves: 640 Description: We found this message : can you decipher it? qiPGS{3apElcg1ba_1f_r4fl}

Infos:

A .txt file is provided (file.txt)

Solution: To solve this challenge you need to decrypt the message. With the title chall, we quickly find that the encryption is in link with Base64.

So when we go on (CyberChef) and copy/paste the encrypted message, we can see that the content is reduce. We continue to decrypt by add more "From Base64" block. And after 20 blocks the flag is displayed.

I also created a python program to do that (decode.py)

🚩 FLAG

dvCTF{Base64_Is_The_Best}