Each car comes with two sets of keys. Each set (Fig. 1) contains two keys: a longer one for turning on the ignition, a shorter one for the door locks and trunk lid. Each key has its series number stamped on it.
In the variant version, the ignition key number is applied to the flag of the ring that holds the keys together. By cutting off the flag or replacing the ring, you can keep the key number secret.
(The article is copied from the website vazbook.ru)