You work as the it security administrator for a small corporate network. you have designed the physical security of the offices and assets in the building, and now you need to implement your plan. you plan to install smart card readers. smart cards have the ability to encrypt access information. smart cards can require contact or be contactless. proximity cards, also known as rfid (radio frequency identification) cards, are a subset of smart cards that use the 125 khz frequency to communicate with proximity readers. proximity cards differ from smart cards because they are designed to only communicate the card's id, but the smart card can communicate more information.