About this interactive
Keys work well for a home, a locking cabinet or a laptop lock. For most business doors, the lesson says, they are not a great solution, and it names the reasons.
A key can be lost or stolen, and then it opens the lock for whoever has it.
A key can be copied. A duplicate opens the lock exactly as the original does, and nobody knows how many working keys exist.
A lock can be opened without its key: picked with tools, or opened with a bump key, a specially cut key that opens many locks of the same type. The lesson's author learned to pick a lock and says it is not that difficult.
And one key can open more than one door. The lesson's magnetic tag key is a terrible key for exactly that reason: anyone who gets it gets every door it opens.
To sort a card, ask what has gone wrong: the key has left your control, a second key exists, the lock was opened without a key, or one key reaches too far.
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