Bitting Code
The translated blind code which the locksmith actually uses to cut each cut on a blank key. Example: padlock blind code W123 translates to bitting code 25313, to which the locksmith would cut the key with his code machine by setting it to 25313.
Experienced locksmiths might be able to figure out a bitting code from looking at a picture of a key. This happened to Diebold voting machines in 2007 after they posted a picture of their master key online, people were able to make their own key to match it and open the machines.
Read more about this topic: Key Code
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