HTB - Crypto: Raining Primes

Challenge Summary

  • Name: Raining Primes
  • Category: Crypto
  • Difficulty: Hard
  • Goal: Recover the flag from an RSA-wrapped AES ciphertext.
 

Zero

CTF notes by Zero

Recovering a hidden shared prime with continued-fraction filtering, forcing AES key bits to zero, then factoring structured RSA.

2026-03-11

Tags

#ctf #htb #cry