Questions · Access control
Is a PIN keypad good enough for controlling a door?
As the only credential, only on low-risk doors. A PIN is the one thing that can be passed on by phone, in writing or shouted from the other end of the corridor, and that means more people end up knowing it than the system records.
Its other two problems are that it does not expire on its own and it does not identify anyone: if six people share the code for a room, the log says the code went in, not who. If it is used, it has to be one PIN per person with a scheduled change, not a zone code written on a piece of paper inside the electrical panel.
Where the PIN is very useful is as a second factor. Card alone during working hours, and card plus PIN out of hours or on the warehouse door: you gain a lot without changing credential or buying biometric readers. And it is worth looking at the keypad itself: the ones that block the side view and the ones that shuffle the position of the numbers stop the person in the queue learning the code by repetition.
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