Authentication device, authentication method, and program

Abstract

The present invention provides an authentication device, an authentication method, and a program that can improve authentication accuracy by taking into account misalignment during installation. [Solution] The authentication device acquires the received signal corresponding to one of several combinations of multiple transmitting elements that each emit a transmission signal into the user's body and multiple receiving elements that receive a reception signal corresponding to the transmission signal, as authentication registration data which is the user's acoustic data. Then, it acquires multiple received signals corresponding to each of the multiple combinations as the user's acoustic data, and performs user authentication based on the acquired multiple user acoustic data and authentication registration data. This makes it possible to improve authentication accuracy by taking into account misalignment of the device.

Description

Technical Field

[0001] The present invention relates to an authentication device, an authentication method, and a program.

Background Art

[0002] Various techniques for authenticating users have been proposed. For example, Patent Document 1 discloses a wearable device that improves the accuracy of biometric authentication using acoustic information acquired by the wearable device.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the wearable device described in Patent Document 1 has room for improvement in terms of improving the authentication accuracy in consideration of wearing displacement.

[0005] The present invention has been made in view of the above circumstances, and an object thereof is to provide an authentication device, an authentication method, and a program capable of improving the authentication accuracy in consideration of wearing displacement.

Means for Solving the Problems

[0006] To achieve the above objective, the present invention provides an authentication device comprising: an authentication registration data acquisition unit that acquires a received signal corresponding to one of a plurality of combinations of a plurality of transmitting elements that each output a transmission signal into the user's body and a plurality of receiving elements that receive a received signal corresponding to the transmission signal, as authentication registration data which is the user's acoustic data; a data acquisition unit that acquires a plurality of received signals corresponding to each of the plurality of combinations as the user's acoustic data; and an authentication unit that performs authentication of the user based on the plurality of the user's acoustic data acquired by the data acquisition unit and the authentication registration data. [Effects of the Invention]

[0007] According to the present invention, authentication accuracy can be improved by taking into account misalignment during fitting. [Brief explanation of the drawing]

[0008] [Figure 1] This is an explanatory diagram showing an example of the appearance of an authentication device. [Figure 2] This is a block diagram showing an example of an authentication device. [Figure 3] This is an explanatory diagram showing an example of how an authentication device is installed. [Figure 4] This flowchart shows an example of the authentication registration data registration process. [Figure 5] A flowchart illustrating an example of the authentication process. [Figure 6] This is an explanatory diagram showing an example of how an authentication device is installed. [Figure 7] This is an explanatory diagram showing an example of the appearance of the authentication device in a modified example. [Figure 8] This is an explanatory diagram showing an example of how an authentication device is installed in a modified example. [Modes for carrying out the invention]

[0009] An authentication device, authentication method, and program relating to embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals. Hereafter, the authentication device of the present invention will be described using an example in which it is applied to the authentication system 1 shown in Figure 1.

[0010] The authentication device 100 is a belt-shaped device worn on the user's arm, and as shown in Figure 1, it comprises elements 200a to 200e, a control device 300, and a system bus 400 connecting them. The authentication device 100 can be worn by wrapping it around a person's arm. The authentication device 100 has the function of authenticating the user using active acoustic sensing, and in this embodiment, the authentication device 100 enables user authentication even if the wearing position shifts. In this embodiment, the following description will be given using the case of user authentication for payment as an example, but the authentication device 100 can be applied to various situations other than payment, such as user authentication for entry into a venue or unlocking a lock. The elements 200a to 200e, the control device 300, and the system bus 400 connecting them are provided on a circuit board inside the belt portion 50, and the belt portion 50 can be made of, for example, resin.

[0011] Elements 200a to 200e are composed of piezoelectric elements. In this embodiment, as shown in Figure 2, elements 200a to 200e each have a speaker and a microphone, and based on control by the control device 300, the operating states of the speaker and microphone can be switched, i.e., switched between transmission and reception. In this embodiment, among elements 200a to 200e, the elements set as transmitting elements function as ultrasonic speakers, and the elements set as receiving elements function as ultrasonic microphones. In this embodiment, an example is shown where there are five elements, elements 200a to 200e, but the authentication device 100 may have six or more elements with narrower spacing between each element. If there are multiple combinations of transmitting and receiving elements, the number of elements (three or more) can be arbitrarily changed.

[0012] The control device 300 shown in Figure 1 is a so-called computer that controls elements 200a to 200e to acquire user data and authenticate the user. As shown in Figure 2, the control device 300 includes a storage unit 110, a control unit 120, an input / output unit 130, a payment interface 140, and a system bus (not shown) that connects these to each other.

[0013] The storage unit 110 includes ROM (Read Only Memory), RAM (Random Access Memory), HDD (Hard Disk Drive), SSD (Solid State Drive), etc. The ROM stores the program 111 executed by the control unit 120, various data (not shown) necessary in advance for executing the program 111, and authentication registration data 112.

[0014] Program 111 is a program that executes the authentication registration data registration process and authentication process, which will be described later, and is stored in the storage unit 110 in advance.

[0015] The authentication registration data 112 is the user's acoustic data used for authentication. This authentication registration data 112 is recorded in the storage unit 110 when the authentication registration data registration process described later is executed. When the authentication process described later is executed, the authentication registration data 112 is used as the user's reference data. In other words, as will be described in detail later, the user's authentication is performed by comparing the user's acoustic data acquired during the authentication process with the acoustic data indicated by the authentication registration data 112.

[0016] The control unit 120 is composed of a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), etc. The control unit 120 operates according to the program 111 stored in the storage unit 110 and executes the processing according to the program 111. As the main functional units provided by the program 111 stored in the storage unit 110, the control unit 120 includes an authentication registration data acquisition unit 121, an element setting unit 122, a data acquisition unit 123, an authentication unit 124, and a settlement processing unit 125.

[0017] The authentication registration data acquisition unit 121 is a functional unit that acquires the authentication registration data 112 which is the reference data for authenticating the user. Specifically, the authentication registration data acquisition unit 121 is a functional unit that executes the authentication registration data registration process shown in FIG. 4, and has the function of recording the authentication registration data 112 in the storage unit 110 by the authentication registration data registration process.

[0018] The element setting unit 122 shown in FIG. 2 is a functional unit that sets the combination of the transmission element and the reception element among the elements 200a to 200e. Specifically, the element setting unit 122 has the function of sequentially changing the combination of the transmission element and the reception element according to the preset priority order. That is, the element setting unit 122 first sets any one of the elements 200a to 200e (for example, element 200a) as the transmission element (ultrasonic speaker), and sets one adjacent element (for example, element 200b) to this set element as the reception element (ultrasonic microphone), and then, it is a functional unit that repeats the process of switching the element set as the transmission element (ultrasonic speaker) and the element set as the reception element (ultrasonic microphone) to other adjacent elements (for example, element 200b as the transmission element and element 200c as the reception element). Here, since there are 4 combinations of the transmission element and the reception element, the process of switching to other adjacent elements is repeated 3 times.

[0019] The data acquisition unit 123 is a functional unit that acquires acoustic data of a user. Specifically, the data acquisition unit 123 outputs ultrasonic waves from 20 kHz to 90 kHz from the element set as the transmission element by the element setting unit 122, and receives the ultrasonic waves through the user's arm by the element set as the reception element by the element setting unit 122, thereby having a function of acquiring the acoustic data of the user.

[0020] The authentication unit 124 is a functional unit that performs user authentication based on the acoustic data acquired by the data acquisition unit 123 and the authentication registration data 112. Specifically, the authentication unit 124 has a function of performing authentication that the user is the same based on whether the acoustic data acquired by the data acquisition unit 123 matches the authentication registration data 112.

[0021] The settlement processing unit 125 is a functional unit that performs settlement of an amount specified by the user. Specifically, the settlement processing unit 125 has a function of executing a process of performing settlement of the amount specified by the user through the settlement interface 140 when the user authentication is successful by the function of the authentication unit 124.

[0022] The input / output unit 130 is a device composed of, for example, operation buttons, a liquid crystal display, an organic EL (Electro-Luminescence) display, etc., and is used for inputting and outputting various data.

[0023] The settlement interface 140 is an interface for the authentication device 100 to perform settlement through communication with other information terminals such as a settlement terminal. The above is the configuration of the authentication device 100.

[0024] Next, the operation of the authentication device 100 will be explained with reference to Figures 3 to 6. In this example, as shown in Figure 3, the user will wear the authentication device 100 on their arm so that the element 200c is at the center O of the arm 99, and the authentication registration data registration process will be executed. The authentication registration data registration process shown in Figure 4 is started by the authentication registration data acquisition unit 121 when the user wearing the authentication device 100 performs a start operation. The start operation can be any operation on the input / output unit 130 of the authentication device 100, such as pressing a button.

[0025] When the authentication registration data registration process shown in Figure 4 is started, the control unit 120 uses the function of the element setting unit 122 to set element 200c as the transmitting element and element 200d as the receiving element (step S11). Specifically, in the process of step S11, the element setting unit 122 sets element 200c to function as an ultrasonic speaker and element 200d to function as an ultrasonic microphone. In this example, since element 200c is attached so that it is at the center O of the arm 99 during the authentication registration data registration process, the process of step S11 shows element 200c as the transmitting element and element 200d as the receiving element, but other combinations of elements may also be used. The combination of elements set in the process of step S11 can be changed arbitrarily.

[0026] After executing the process in step S11, the control unit 120 acquires the user's acoustic data using the functions of the data acquisition unit 123 (step S12). Specifically, in the process of step S12, the data acquisition unit 123 receives the ultrasonic waves output from the ultrasonic speaker of element 200c via the ultrasonic microphone of element 200d through the user's arm 99, thereby acquiring acoustic data in the wearing state shown in Figure 3.

[0027] After executing the process shown in step S12 in Figure 4, the control unit 120 records the acquired acoustic data as authentication registration data 112 using the function of the authentication registration data acquisition unit 121 (step S13), and terminates the authentication registration data registration process. Specifically, in the process of step S13, the authentication registration data acquisition unit 121 records the user's acoustic data acquired in the process of step S12 as authentication registration data 112 in the storage unit 110. In the process of step S13, the authentication registration data acquisition unit 121 performs audio processing such as Fast Fourier Transform on the acquired acoustic data to convert it into frequency-specific data and extract features, and then records the acquired acoustic data as authentication registration data 112.

[0028] In this way, when the authentication registration data registration process is executed, the authentication registration data 112, which will be used as the user's reference data, is registered in the storage unit 110. Next, the authentication operation in the authentication device 100 will be described. The authentication operation is performed by the authentication process shown in Figure 5. The authentication process is started when a start operation is performed by a user wearing the authentication device 100 on their arm. The start operation can be any operation on the input / output unit 130 of the authentication device 100, such as pressing a button. In this example, the following explanation will be given using the case where the authentication process is performed with the element 200b positioned at the center O of the arm 99, as shown in Figure 6.

[0029] When the authentication process shown in Figure 5 is started, the control unit 120 first sets element 200c as the transmitting element and element 200d as the receiving element using the function of the element setting unit 122, similar to the process in step S11 shown in Figure 4 (step S21). That is, it sets the element that was set as the receiving element when the authentication registration data registration process was executed as the receiving element, and sets the element that was set as the transmitting element when the authentication registration data registration process was executed as the transmitting element.

[0030] After executing the process shown in step S21 in Figure 5, the control unit 120 acquires the user's acoustic data using the function of the data acquisition unit 123, similar to the process shown in step S12 in Figure 4 (step S22).

[0031] After executing the process shown in step S22 in Figure 5, the control unit 120 compares the user's acoustic data acquired in step S22 with the authentication registration data 112 using the functions of the authentication unit 124 (step S23). Specifically, in the process of step S23, the authentication unit 124 compares the user's acoustic data acquired in step S22 with the authentication registration data 112 of the said user, which was registered in the storage unit 110 in the authentication registration data registration process shown in Figure 4. More specifically, in the process of step S23, the authentication unit 124 performs audio processing such as Fast Fourier Transform on the user's acoustic data acquired in step S22 to obtain frequency-specific data and extract features, and compares it with the authentication registration data 112.

[0032] After executing the process shown in step S23 in Figure 5, the control unit 120 determines whether or not the user is the same person using the function of the authentication unit 124 (step S24). Specifically, in the process of step S24, the authentication unit 124 confirms whether or not the user's acoustic data matches the authentication registration data 112 as a comparison result from the process of step S23 (whether or not the degree of matching falls within a predetermined error range), thereby determining whether or not the user is the same person, i.e., authenticating the user. Note that the wearing state shown in Figure 6 is different from the wearing state shown in Figure 3, i.e., the wearing state at the time of registration of the authentication registration data 112. Therefore, even if the ultrasonic waves output from the ultrasonic speaker of element 200c are received by the ultrasonic microphone of element 200d via the arm 99 of the same user, the resulting acoustic data will be different from the authentication registration data 112. In other words, the positional misalignment between the transmitting element and the receiving element will result in different acoustic data. Consequently, in the process of step S24 in this example, since the comparison result from the process of step S23 does not match, it is determined that the user is not the same person, i.e., authentication fails.

[0033] If it is determined in step S24 shown in Figure 5 that the individuals are not the same person (step S24; No), the control unit 120 determines whether or not measurements have been completed for all combinations of elements that are set as priority, that is, whether or not measurements have been taken for all elements (step S25). Specifically, in step S25, the control unit 120 determines whether or not measurements have been taken for all elements according to the pre-set priority, for example, based on the number of times the process in step S22 has been executed. In this embodiment, there are five elements, elements 200a to 200e, so it is sufficient to determine whether or not measurements have been taken for all elements by determining whether or not the process in step S22 has been performed four times. If there are N elements, it is sufficient to determine whether or not it has been performed N-1 times. In this embodiment, there are four combinations: combination A, where element 200a is the transmitting element and element 200b is the receiving element; combination B, where element 200b is the transmitting element and element 200c is the receiving element; combination C, where element 200c is the transmitting element and element 200d is the receiving element; and combination D, where element 200d is the transmitting element and element 200e is the receiving element.

[0034] If, in step S25, it is determined that not all elements have been measured (step S25; No), the control unit 120 changes the combination of transmitting and receiving elements according to a preset priority order using the function of the element setting unit 122 (step S26), and returns to step S22. Specifically, in step S26, the element setting unit 122 changes the combination of transmitting and receiving elements according to the priority order set in the order of combination C → combination B → combination D → combination A. For example, if acoustic data for combination C has already been acquired in step S22, the element setting unit 122 in step S26 should change to combination B. In other words, in this embodiment, the priority order is set so that combinations that are close in distance to the combination registered in the authentication registration data 112 have a higher priority. Then, the process returns to step S22 and acoustic data for combination B is acquired. The process in step S26 is repeatedly executed until it is determined in step S24 that the same person is being measured, or until it is determined in step S25 that not all elements have been measured.

[0035] On the other hand, if the process in step S24 determines that the users are the same person (step S24; Yes), that is, if the comparison result from the process in step S23 determines that the user's acoustic data matches the authentication registration data 112, the control unit 120 determines that authentication is successful using the function of the authentication unit 124 (step S27), and the payment processing unit 125 performs payment for the amount specified by the user through the payment interface 140 (step S28). After executing the process in step S28, the authentication process ends. The fact that authentication was successful and payment has been made can be output via the input / output unit 130.

[0036] Furthermore, if the process in step S25 determines that measurements have been taken for all elements (step S25; Yes), that is, if none of the acoustic data for any of the element combinations designated as priority match the authentication registration data 112, the control unit 120 determines that authentication has failed (step S29) based on the function of the authentication unit 124, and terminates the authentication process. In the process of step S29, for example, it is sufficient to output that authentication has failed via the input / output unit 130.

[0037] The above describes the operation of the authentication device 100. As described above, with the authentication device 100 in this embodiment, even if a shift in the mounting position occurs, user authentication can be performed using acoustic data acquired by any of the multiple combinations of the transmitting element and the receiving element, thereby improving the accuracy of user authentication when a shift in the mounting position occurs.

[0038] Furthermore, according to the authentication device 100 in this embodiment, in the authentication process shown in Figure 5, the data acquired for each combination of transmitting and receiving elements is authenticated at the time of acquisition to determine whether or not it belongs to the same person. Therefore, measurement (acquisition) after successful authentication can be eliminated, thereby reducing the processing load and processing time related to measurement. Furthermore, according to the authentication device 100 in this embodiment, measurement is first started from the same combination of transmitting and receiving elements as the combination used when registering the authentication registration data 112. The user is highly likely to perform the authentication process in the same wearing state as when registering the authentication registration data 112. Therefore, the number of measurements (acquisitions) required until authentication is successful can be reduced, thereby reducing the processing load and processing time related to measurement. Furthermore, according to the authentication device 100 in this embodiment, the combination of transmitting and receiving elements is sequentially changed by prioritizing combinations that are close in distance to the combination registered in the authentication registration data 112. It is rare for a user to wear the device with a significant misalignment compared to the wearing state at the time of registration of the authentication registration data 112, and in most cases, any misalignment is only slight. Therefore, by measuring from combinations that are close in distance to the combination registered in the authentication registration data 112, user authentication can be performed effectively. In this case as well, the number of measurements required until successful authentication can be reduced, thereby reducing the processing load and processing time related to measurement. Furthermore, in the authentication device 100 of this embodiment, since the transmitting element also functions as a receiving element and the receiving element also functions as a transmitting element, the number of elements can be reduced if the number of combinations of transmitting and receiving elements is the same, compared to the case where the transmitting element functions only as a transmitting element and the receiving element functions only as a receiving element. Conversely, if the number of elements is the same, the number of combinations of transmitting and receiving elements can be increased to increase the number of measurements, making it possible to accommodate various positional deviations and increasing the probability of successful authentication. In addition, since the distance between the elements before and after the change when changing the combination of transmitting and receiving elements can be shortened, the authentication accuracy can be improved in the case of slight positional deviations.

[0039] Furthermore, this invention is not limited to the above embodiments, and various modifications and applications are possible. For example, the authentication device 100 according to the above embodiment does not have to have all of the technical features shown above, and may have some of the configurations described in the above embodiment so as to solve at least one problem in the prior art. Also, at least some of the following modifications may be combined.

[0040] In the above embodiment, an example was shown in which elements 200a to 200e, a control device 300, and a system bus 400 connecting them are provided on a circuit board inside the belt portion 50 of the authentication device 100, but this is just one example. The authentication device 100 may be, for example, a smartwatch. Specifically, the control device 300 may be provided inside the smartwatch, and elements 200a to 200e and the system bus 400 may be provided on the belt portion of the smartwatch. In addition, the authentication device 100 may be a device worn on the wrist, for example, a device worn on the ring or ankle, or a device worn on the ear, such as an earring.

[0041] Furthermore, the authentication device 100 according to the above embodiment, as shown in Figure 1, is shown as an example in which elements 200a to 200e are arranged in one row, but this is just one example. In addition, as shown in Figure 7, for example, an authentication device 100' may be used which has three rows of elements, including five elements 200a1 to 200e1, as well as the row of elements 200a2 to 200e2 and elements 200a3 to 200e3 shown in the figure. The authentication device 100 shown in Figure 1 only responds to positional misalignment in the NS direction when worn on the arm, as shown in Figure 8, but the authentication device 100' shown in Figure 7 can respond to positional misalignment in the WE direction in addition to the NS direction shown in Figure 8, thereby improving authentication accuracy. In this case, if the element setting unit 122 uses a combination of elements belonging to the same column, such as element 200c1 and element 200d1 when registering the authentication registration data 112, then when changing the element combination in step S26 shown in Figure 5, it is sufficient to change it to use a combination of adjacent elements in the same column (for example, element 200c2 and element 200d2). On the other hand, if the element combination used when registering the authentication registration data 112 is such as element 200c1 and element 200c2, then when changing the element combination in step S26 shown in Figure 5, it is sufficient to change it to use a combination of adjacent elements from different columns (for example, element 200c2 and element 200c3).

[0042] Furthermore, in the above embodiment, the authentication process shown in Figure 5 demonstrates an example of authenticating whether the data acquired for each combination of transmitting and receiving elements belongs to the same person, but this is just one example. For example, after acquiring measurement data corresponding to all combinations of transmitting and receiving elements, authentication may be performed to determine whether any of the measurement data matches the authentication registration data 112. In other words, instead of performing identity authentication each time measurement data is acquired, all measurement data may be acquired first, and then it may be determined from all the measurement data whether there is any data that matches the authentication registration data 112.

[0043] Furthermore, while the above embodiment shows an example of sequentially changing the combination of transmitting and receiving elements according to a predetermined priority, the priority may be set individually for each user according to the user's habits and tendencies. Specifically, the combinations of transmitting and receiving elements that have successfully authenticated so far may be stored as a history of successful authentication combinations, and the priority may be set so that the combinations of transmitting and receiving elements with a high probability of successful authentication have a higher priority. In other words, the priority may be set by a learning model that has learned to give higher priority to combinations of transmitting and receiving elements that have successfully authenticated in the past. This allows for earlier user authentication and reduces the processing load and processing time related to measurement, thereby improving convenience. The learning model may be, for example, a learning model that has been trained using combinations of transmitting and receiving elements that have successfully authenticated in the past as training data from among multiple elements.

[0044] Furthermore, the above embodiment shows an example in which the combination of transmitting and receiving elements is changed sequentially, that is, an example in which the transmitting element also functions as a receiving element and the receiving element also functions as a transmitting element, but this is just one example. For example, the function of each element may be fixed so that the transmitting element functions only as a transmitting element and the receiving element functions only as a receiving element. That is, in the case where four elements 200a to 200d are provided, elements 200a and 200c may be fixed as transmitting elements, and elements 200b and 200d as receiving elements. Then, measurements may be taken by changing the combination of elements 200a and 200b and the combination of elements 200c and 200d.

[0045] Furthermore, the authentication device 100 according to the above embodiment can be implemented using a regular computer, not a dedicated device. For example, the authentication device 100 that performs the above processing may be configured by installing a program for performing any of the above-mentioned actions from a recording medium to the computer. Alternatively, multiple computers may work together to form a single authentication device 100.

[0046] Furthermore, if the above-mentioned functions are realized through a division of labor between the OS (Operating System) and the application, or through collaboration between the OS and the application, then only the parts other than the OS may be stored on the medium.

[0047] Furthermore, it is possible to superimpose a program onto a carrier wave and distribute it via a communication network. For example, the program could be posted on a bulletin board system (BBS) on the communication network and distributed via the network. These programs could then be launched and executed under the control of the operating system, similar to other application programs, thereby enabling the execution of the aforementioned processes.

[0048] This invention allows for various embodiments and modifications without departing from the broad spirit and scope of the invention. Furthermore, the embodiments described above are for illustrative purposes only and do not limit the scope of the invention. In other words, the scope of the invention is indicated not by the embodiments, but by the claims. Various modifications made within the scope of the claims and the equivalent scope of the invention are considered to be within the scope of the invention. [Explanation of Symbols]

[0049] 100 Authentication device, 121 Authentication registration data acquisition unit, 123 Data acquisition unit, 124 Authentication unit

Claims

1. An authentication registration data acquisition unit acquires an authentication registration data which is the user's acoustic data, from among multiple combinations of multiple transmitting elements that each output a transmission signal within the user's body and multiple receiving elements that receive a reception signal corresponding to the transmission signal, and the reception signal corresponding to one combination of these elements. A data acquisition unit that acquires multiple received signals corresponding to each of the above multiple combinations as the user's acoustic data, An authentication unit that authenticates the user based on the multiple user acoustic data and authentication registration data acquired by the data acquisition unit, An authentication device characterized by having the following features.

2. The authentication unit determines that the user has been successfully authenticated if any of the user's acoustic data corresponding to each of the plurality of combinations matches the authentication registration data. The authentication device according to feature 1.

3. The system further includes an element setting unit that sets a combination of elements to be used for data measurement from among a plurality of combinations of the transmitting element and the receiving element, The data acquisition unit measures the user's acoustic data corresponding to the combination of elements set in the element setting unit. The authentication unit authenticates the user based on the user's acoustic data acquired by the data acquisition unit and the authentication registration data. The element setting unit changes the combination of elements when the authentication unit determines that the user has failed to authenticate. The authentication device according to claim 1 or 2.

4. The element setting unit sets the first combination of elements used when the authentication registration data acquisition unit acquired the authentication registration data as the first combination of elements to be used for data acquisition. The authentication device according to feature 3.

5. If the element setting unit further changes the combination of elements, it sets the combination of elements that is close in distance to the first combination used when the authentication registration data acquisition unit acquired the authentication registration data as the combination of elements to be used for data acquisition. The authentication device according to feature 4.

6. The element setting unit sets the first combination used when the authentication registration data acquisition unit acquired the authentication registration data as the first combination of elements to be used for data measurement, and when changing the combination of elements, it changes the combination of elements according to the priority set using the learning model. The learning model is a learning model that has learned the combination of elements that the authentication unit has previously determined to have successfully authenticated the user, using these combinations as training data. The authentication device according to feature 3.

7. The system further includes an element setting unit that sets a combination of elements to be used for data measurement from among a plurality of combinations of the transmitting element and the receiving element, The element setting unit can change the transmitting element to the receiving element and the receiving element to the transmitting element, and by changing the transmitting element to the receiving element or the receiving element to the transmitting element, the combination of the elements is changed. The authentication device according to claim 1 or 2.

8. Authentication method using an authentication device, A step to acquire authentication registration data, in which a received signal corresponding to one of a plurality of combinations of a plurality of transmitting elements that each output a transmission signal within the user's body and a plurality of receiving elements that receive a received signal corresponding to the transmission signal is acquired as authentication registration data which is the user's acoustic data, A data acquisition step in which multiple received signals corresponding to each of the multiple combinations are acquired as the user's acoustic data, An authentication step which authenticates the user based on the multiple user acoustic data and authentication registration data obtained in the data acquisition step, An authentication method that includes [a specific feature / feature].

9. Computers, An authentication registration data acquisition unit acquires an authentication registration data which is the user's acoustic data, from among multiple combinations of multiple transmitting elements that each output a transmission signal within the user's body and multiple receiving elements that receive a reception signal corresponding to the transmission signal, and the reception signal corresponding to one combination of these elements. A data acquisition unit acquires multiple received signals corresponding to each of the above multiple combinations as the user's acoustic data. An authentication unit that authenticates the user based on the multiple user acoustic data and authentication registration data acquired by the data acquisition unit. A program that makes it function as such.

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