Locksmithing began as the science and art of making and locks. A lock's a mechanism that secures buildings, rooms, cabinets, objects, or other storage facilities. A key's often used to open a lock. Means of opening a lock may include two-factor authentication for greater security, such as requiring both something you know (a combination) and something you've (a key or keycard). Locksmithing's one of the earliest forms of security engineering. Lock picking was one of the first methods of crackin… (More on Locksmith)