import socket

def encode_byte(b, key):

    return (b + key) % 256

def simulate_flag_transfer(filename, key=42):
    print(f"[!] flag transfer for '{filename}' using encoding key = {key}")

    with open(filename, "rb") as f:
        data = f.read()

    print(f"[+] Encoding and sending {len(data)} bytes...")

    for b in data:
        encoded = encode_byte(b, key)
        pass

    print("Transfer complete")

if __name__ == "__main__":
    simulate_flag_transfer("flag.txt")