cryptoeasy

The Last Dance

hackthebox

Task: ChaCha20 stream cipher encrypts a known message and a flag using the same key and nonce. Solution: Recover keystream by XORing known plaintext with its ciphertext, then decrypt the flag.

$ ls tags/ techniques/
xorstream_cipherchacha20nonce_reuse
keystream_recoverynonce_reuse_attack
🔒

Permission denied (requires tier.pro)

Sign in to access full writeups

Create a free account with GitHub, then upgrade to Pro.

$ssh [email protected]