Patent ID: 8787902

Claim:
A method for mobile-key service using a mobile phone having a NFC (Near Field Communication) function and equipped with SE (Secured Element) storing a mobile-key, a door lock which performs user authentication based on the mobile-key transmitted through the NFC function, and a server which communicated with the mobile phone through a mobile radio communication network, comprising: running the security program transmitted from the server so as to be synchronized with the server; storing a unique Endpoint ID (Identification) in a storing means of the mobile phone and the SE, wherein the Endpoint ID is generated and transmitted by the server; periodically checking whether the mobile phone can communicate with the server through the mobile radio communication network so that the mobile phone is within a call service area; enabling the NFC function of the mobile phone when the mobile phone is within the call service area; transmitting the mobile-key from the SE to the door lock through the NFC function when the mobile phone approaches the door lock; and receiving the mobile-key and locking or unlocking a door by the door lock according to a result of the user authentication using the mobile-key.