1def xor_decrypt(ciphertext_bytes, key):2    return bytes(b ^ key for b in ciphertext_bytes)3 4def is_printable_ascii(data):5    try:6        decoded = data.decode('ascii')7        return all(32 <= c <= 126 for c in data)8    except Exception:9        return False10 11def find_flag(ciphertext_hex):12    ciphertext_bytes = bytes.fromhex(ciphertext_hex.replace('-', ''))13    14    for key in range(256):15        decrypted = xor_decrypt(ciphertext_bytes, key)16        17        if is_printable_ascii(decrypted):18            text = decrypted.decode('ascii')19            if 'flag{' in text:20                print(f"[+] Key found: {hex(key)}")21                print(f"Decrypted text: {text}")22                return text23    print("[-] No valid flag found.")24    return None25 26ciphertext = "5f-55-58-5e-42-71-7a-6d-7f-48-4e-5c-78-6a-7d-08-0e-0a-44"27find_flag(ciphertext)

1flag{HCTFqweASD173}

1flag{Qw3!E7tY$uI^8oP4}

1flag{0ff!ce_3asy_cr@ck3d}

1flag{HNCTFmZ5bM1ZYAi7}

1flag{HNCTF2ypZRYzFeH6U}

1flag{HNCTF0hZFXnNia}