Multi Encoder-Traboda-Cryptography - CTF -Write-up

Aravind Rajesh
3 min readJun 29, 2021

CHALLENGE DESCRIPTION

Its all about the base

Flag format — inctfj{flag_here}

Flag Format: inctfj{...}

ciphertext

Given a hex encoded ciphertext. Using one of the online hex-decoders, I decoded the ciphertext. Unfortunately it was not the end but was just a beginning only😇…On decoding got Base64 encoded text. Using an online Base64 decoder decrypted it…But that was also not the end. At some point I thought I was in the wrong direction. But the challenge title, made me feel I was right.

Hint to identify diff. encodings:

  • Hexadecimal codes only use the digits 0–9 and letters A-F or a-f
  • Base64 is easy to recognize. It consists of letters (about 50% uppercase and 50% lowercase), as well as numbers, and often equal-characters (=) at the end.

After series of Hex and Base64 decodings, I got the 🏁…..

Challenge flag: inctfj{Y0u_@re_Qu1t3_th3_D3c0d3r}

Traboda CyberLabs

About Traboda…

Traboda is an end-to-end cybersecurity learning platform which has more than 400+ CTF challenges spreading across various categories of Cybersecurity. Level up your skills through immersive, gamified and hands-on learning experience.

--

--

Aravind Rajesh

CSE undergrad. Learning web3 and Blockchain. Interested in both Development and Security.