Whenever we do lock-pick or impressioning championships we always make sure to keep the original keys far out of sight of the participants.
The reason is a two second peek of the key is enough for an expert to ‘read’ it. After that he/she knows the (approximate) key combination and picking or impressioning becomes much more simple.
I even hear rumors surveillance teams try to make photographs of keys visibly worn by suspects to give the NDE operator a head start ….
And in some prisons the guards carry keys in a way the inmates can not see them.
People that are concerned with others ‘reading’ their keys can have a look at a new product called ‘key port’. It is not a cheap solution, but it is effective and sure makes a great Christmas present ….

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