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.