If I was to say that it is an access card, that would be correct. There are other things though that can be a credential. There are Key Fobs, Plastic insert keys, keys with logic chips built in, wireless transmitters, …and the list can go on. A credential is anything that can store a unique identifier and pass it to a collecting device when it is needed. In the case of bio-meterics your mind can store a number, your hand has a certain geometry, or what about your finger print. All of these things can and are being used as a credential. In the next few minutes we are going to explore some of the basics about these items. Some of the more common items that we will look at are:
- Cards – Mag Stripe, Bar Code, Barrium Ferrite, Wiegand, Keypads, and Proximity
- Smart Cards
You are going to be the processor for this example. Push the button that corresponds to your decision.
A card is considered valid if several questions are answered correctly.
- Is the card number recognized by the panel or the access system?
- Is the card supposed to be used at this reader?
- If the card is supposed to be used at this reader, then is it okay to use it at this time?
- All of this data is stored in the system. This data is what comprises the cards “Access Level”.
No discussion of card data formats would be complete without a brief look at the communication interface. An “interface” defines how two devices communicate with one another. Various HID readers can communication using a variety of well established, industry standard interfaces. The three most common are: