Abstract: An access control method of a door operating device that communicates with a user terminal, the access control method may comprise determining a distance between the door operating device and the user terminal based on a received signal strength corresponding to a transmitted signal from at least one of the door operating device and the user terminal; determining whether the distance between the door operating device and the user terminal is within a first distance; establishing a communication connection between the door operating device and the user terminal when the distance between the door operating device and the user terminal is within the first distance; determining whether the distance between the door operating device and the user terminal is within a second distance; and obtaining open authentication information when the distance between the door operating device and the user terminal is within the second distance.

Abstract: An access control method of a door operating device that communicates with a user terminal, the access control method may comprise determining a distance between the door operating device and the user terminal based on a received signal strength corresponding to a transmitted signal from at least one of the door operating device and the user terminal; determining whether the distance between the door operating device and the user terminal is within a first distance; establishing a communication connection between the door operating device and the user terminal when the distance between the door operating device and the user terminal is within the first distance; determining whether the distance between the door operating device and the user terminal is within a second distance; and obtaining open authentication information when the distance between the door operating device and the user terminal is within the second distance.

Abstract: An access control method of a door operating device that communicates with a user terminal, the access control method may comprise determining a distance between the door operating device and the user terminal based on a received signal strength corresponding to a transmitted signal from at least one of the door operating device and the user terminal; determining whether the distance between the door operating device and the user terminal is within a first distance; establishing a communication connection between the door operating device and the user terminal when the distance between the door operating device and the user terminal is within the first distance; determining whether the distance between the door operating device and the user terminal is within a second distance; and obtaining open authentication information when the distance between the door operating device and the user terminal is within the second distance.

Abstract: An access control method of a door operating device that communicates with a user terminal, the access control method may comprise determining a distance between the door operating device and the user terminal based on a received signal strength corresponding to a transmitted signal from at least one of the door operating device and the user terminal; determining whether the distance between the door operating device and the user terminal is within a first distance; establishing a communication connection between the door operating device and the user terminal when the distance between the door operating device and the user terminal is within the first distance; determining whether the distance between the door operating device and the user terminal is within a second distance; and obtaining open authentication information when the distance between the door operating device and the user terminal is within the second distance.

Abstract: An access control method of a door operating device that communicates with a user terminal, the access control method may comprise determining a distance between the door operating device and the user terminal based on a received signal strength corresponding to a transmitted signal from at least one of the door operating device and the user terminal; determining whether the distance between the door operating device and the user terminal is within a first distance; establishing a communication connection between the door operating device and the user terminal when the distance between the door operating device and the user terminal is within the first distance; determining whether the distance between the door operating device and the user terminal is within a second distance; and obtaining open authentication information when the distance between the door operating device and the user terminal is within the second distance.

Abstract: An access control method of a door operating device that communicates with a user terminal, the access control method may comprise determining a distance between the door operating device and the user terminal based on a received signal strength corresponding to a transmitted signal from at least one of the door operating device and the user terminal; determining whether the distance between the door operating device and the user terminal is within a first distance; establishing a communication connection between the door operating device and the user terminal when the distance between the door operating device and the user terminal is within the first distance; determining whether the distance between the door operating device and the user terminal is within a second distance; and obtaining open authentication information when the distance between the door operating device and the user terminal is within the second distance.

Abstract: An access control method of a door operating device that communicates with a user terminal, the access control method may comprise determining a distance between the door operating device and the user terminal based on a received signal strength corresponding to a transmitted signal from at least one of the door operating device and the user terminal; determining whether the distance between the door operating device and the user terminal is within a first distance; establishing a communication connection between the door operating device and the user terminal when the distance between the door operating device and the user terminal is within the first distance; determining whether the distance between the door operating device and the user terminal is within a second distance; and obtaining open authentication information when the distance between the door operating device and the user terminal is within the second distance.

Abstract: An access control method of a door operating device that communicates with a user terminal, the access control method may comprise determining a distance between the door operating device and the user terminal based on a received signal strength corresponding to a transmitted signal from at least one of the door operating device and the user terminal; determining whether the distance between the door operating device and the user terminal is within a first distance; establishing a communication connection between the door operating device and the user terminal when the distance between the door operating device and the user terminal is within the first distance; determining whether the distance between the door operating device and the user terminal is within a second distance; and obtaining open authentication information when the distance between the door operating device and the user terminal is within the second distance.

Abstract: A sub-reader and a method of controlling the sub-reader are provided. The method of controlling the sub-reader which is connected to a door reader provided in an existing installed door operating device to provide a communication method that is not supported by the door reader includes: obtaining first open request information using a first communication method from a terminal; obtaining second open request information for transmission to the door reader based on the first open request information; and transmitting the second open request information to the door reader using a second communication method different from the first communication method.

Abstract: A method and apparatus for authenticating a user is disclosed that includes measuring biometric information of the user to create biometric measurement information, determining whether a private key included in a user authentication request signal matches a private key issued in advance to the user, comparing pre-set biometric authentication information for the user with the biometric measurement information, calculating a matching ratio when a match is detected, authenticating the user having provided the biometric information as an authorized user based on a result of comparison of the calculated matching ratio with a pre-determined biometric authentication threshold value, and providing an updated private key to the information processing device based on a result of comparison of the calculated matching ratio with a pre-determined updated threshold value.

Abstract: A biometric image output control method in a biometric authentication device comprises the step of generating a biometric image by imaging an living body to be authenticated; determining whether an imaging environment; if the imaging environment satisfies a predetermined recognition condition, controlling a change rate of a size of a biometric image, a change rate of a focal point of the biometric image and a change rate of a brightness of the biometric image according to a distance to the living body to be authenticated; and if the imaging environment does not satisfy the predetermined recognition condition, overly controlling at least one of the change rate of the size of the biometric image, the change rate of the focal point of the biometric image and the change rate of the brightness of the biometric image according to the distance.

Abstract: Provided are control methods of a decryption key storage server, a biometric information storage server, and a matching server in an authentication system.