HTB - Crypto: Broken Decryptor

Challenge Summary

  • Name: Broken Decryptor
  • Category: Crypto
  • Difficulty: Medium
  • Target: Recover server flag from encryption oracle behavior
 

Zero

CTF notes by Zero

Exploiting biased OTP generation plus reused CTR stream to recover the flag deterministically.

2026-02-25

Tags

#ctf #htb #cry