Abstract: An authentication device includes a storage unit for storing authentication information and a plurality of precondition signals corresponding to conversion methods for converting the authentication information into sound waves; a control unit for selecting at least one precondition signal from among the plurality of precondition signals, and converting the authentication information into a sound wave signal by means of a conversion method corresponding to the selected precondition signal; and a sound wave output unit for outputting, as a sound wave signal, the selected precondition signal and the authentication information which has been converted into a sound wave signal.

Abstract: Disclosed is an authentication device. The authentication device comprises: a storage unit for storing authentication information and a plurality of counting information corresponding to a conversion method for converting the authentication information into a sound wave signal; a control unit for converting the authentication information into a sound wave signal by a conversion method corresponding to the counting information changed according to the number of user input; and a sound wave output unit for outputting the authentication information converted into the sound wave signal and the changed counting information as a sound wave signal. Accordingly, it is possible to achieve the effect of improving security as the sound wave signal for transmitting the same authentication information is changed according to the counting information.

Abstract: A device for transmitting authentication information is disclosed. The device for transmitting authentication information according to an embodiment of the present invention comprises: a housing in which a predetermined space is formed; an acoustic output part which is partially exposed outside the housing, is pushed a predetermined distance backward when pressed by an external force, moves forward and returns to the original position in the state where the external force is released, and when pushed backward, outputs authentication information converted into an acoustic signal; and a substrate having a plurality of acoustic output part-coupling holes to which the acoustic output part is coupled movably back and forth.

Abstract: A user authentication method using ultrasonic waves is disclosed. The user authentication method using ultrasonic waves, according to an embodiment of the present invention, comprises the steps of: receiving a sound wave signal which includes analog data; sampling the sound wave signal at a preset sampling rate; generating a block by selecting a preset number of pieces of sampling data; converting sampled data included in the block into frequency components; and determining, as digital data in the block, a letter or number corresponding to the frequency component having the largest magnitude from among the frequency components.

Abstract: A device for transmitting authentication information is disclosed. A device for transmitting authentication information, according to one embodiment of the present invention, comprises: a storage unit for storing authentication information and frequency information corresponding to letters or numbers included in the authentication information; a control unit for generating sound wave signals having a frequency corresponding to the letters or numbers included in the authentication information; and a sound wave output unit for outputting the sound wave signal, wherein the control unit sequentially generates, in the order in which the letters or numbers are enumerated, sound wave signals having a frequency corresponding to the letters or numbers included in the authentication information, and repeatedly generates, a preset number of times, a sound wave signal having a frequency corresponding to each letter or number.

Abstract: Disclosed is an authentication apparatus. The authentication apparatus according to an embodiment of the present invention comprises: a storage unit for storing authentication data corresponding to content stored in a management server; a control unit for converting the authentication data into a sound wave signal; and a sound wave output unit for outputting the converted sound wave signal.