cypherxvu

## writeup-adversarial-crypto-infant.md

      
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                cypherxvu
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              May 21, 2026 05:06
            
              
                CTF Write-up: AdveRSArial Crypto — Infant
              
          
    CTF Write-up: AdveRSArial Crypto — Infant
**Platform: Hackropole (FCSC — France Cybersecurity Challenge)
**Category: Cryptography
**Difficulty: Infant
1. CHALLENGE DESCRIPTION

What the challenge gives us?

  
## vigenere-writeup.md

      
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                cypherxvu
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              May 21, 2026 03:29
            
              
                Vigenère Cipher challenge from Hackropole CTF
              
          
    Write-up: Vigenère Cipher — Hackropole

Category

Cryptography / Intro
Challenge Description

We are given a message encrypted with the Vigenère cipher and the key FCSC.
The goal is to decrypt the message and extract the flag.
Encrypted message: