Electronic locks offer a variety of means of authentication; those described below are not considered exhaustive.
Numerical codes, passwords and passphrases
Perhaps the most prevalent form of electronic lock is that using a numerical code for authentication; the correct code must be entered in order for the lock to deactivate. Such locks typically provide a keypad, and some feature an audible response to each press. Combination lengths are usually between 4 and 6 digits long.
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