There are some alternative keys along with the technology development such as manual keys, digital keys, magnetic keys, and keys with rfid which will be discussed in this report. radio frequency identification (rfid), a new technology, is used in security system application as one of its functions. door keys with rfid, basically same with other door keys, normally have a sensor, a processor unit, and a magnetic relay. the different is the used input which uses radio frequenc y identification (rfid). door keys with rfid need hardware such as a rfid tag, a microcontroller, lcd and magnetic relays, and also arduino ide software. the central controller is arduino uno atmega328 microcontroller. it processes the input data from the rfid reader. whereas, the output controls the lcd and relay magnetic. there are some steps in the work procedure of rfid door keys. first, the rfid tag is read by the reader. second,