Individuals and organizations looking for a way to enhance the level of security at their sites or premises should seriously consider removing their older mechanical master key systems and replacing them with modern, high-end proximity smart card-based access control systems.While using a key system is extremely easy, the truth of the matter is that, on the long-term, it can cost a lot of time and money. For example, should one employee lose his assigned set of keys, the company would have to replace all locks on the site, at a considerable cost.