JP7528904B2 - Information processing method, card, secure device, microcontroller and computer program - Google Patents

Description

The present invention relates to an information processing method, a card, a secure device , a microcontroller , and a computer program in a device with a biometric authentication function.

Smart cards that use biometric information are used to verify the identity of users, such as security IC cards for unlocking doors or information, and IC cards for credit card or prepaid card payments. Biometric information includes voiceprints and vein patterns, but in the case of cards, fingerprint sensors are often used.

Fingerprint authentication in IC cards as described above is performed by the issuer acquiring the user's fingerprint data in advance and incorporating a template before issuing the IC card, and then comparing the fingerprint data acquired when the user uses the card with the template. A template for each user can be obtained, for example, by having the user visit the issuer's store and requesting the user to register their fingerprint data.

Patent Document 1 discloses technology for IC cards equipped with a fingerprint sensor that prevents fingerprint data from being collected in advance by the issuer. Patent Document 1 discloses that when the IC card is delivered to the user, no fingerprint data is registered as a template, but the fingerprint is read multiple times by the fingerprint sensor, and fingerprint authentication begins when the template is completed.

Special table No. 2020-524341

As mentioned above, fingerprint authentication on IC cards is performed based on a comparison with a completed template. However, the user's fingerprint itself may change, or the fingerprint sensor may deteriorate over time. In these cases, the success rate of authentication with a completed template decreases, even if the user himself uses it. Once a template is completed, it cannot be changed, so the card must be reissued.

An object of the present invention is to provide an information processing method, a card, a secure device , a microcontroller , and a computer program that are capable of updating a template in an IC card.

In the information processing method disclosed herein, a processing unit built into a card equipped with a non-temporary storage medium and a fingerprint sensor, when acquiring fingerprint data using the fingerprint sensor, authenticates the user of the card by comparing the fingerprint data with a fingerprint template for matching stored in the non-temporary storage medium, determines which fingerprint data to erase from the acquired fingerprint data and past fingerprint data stored in the non-temporary storage medium, creates a fingerprint template from the remaining fingerprint data excluding the fingerprint data to be erased, stores the remaining fingerprint data in the non-temporary storage medium, and updates the fingerprint template in the non-temporary storage medium with the created fingerprint template.

FIG. 4 is a diagram showing an example of the contents of an IC card. FIG. 2 is a block diagram showing the configuration of an IC card. 13 is a flowchart illustrating an example of an authentication process procedure performed by a processing unit. 13 is a flowchart illustrating an example of an authentication process procedure performed by a processing unit according to the second embodiment. 13 is a flowchart showing an example of an authentication process procedure in the modified example. FIG. 13 is a block diagram showing a configuration of an IC card according to a third embodiment. 13 is a flowchart illustrating an example of an authentication process procedure performed by a processing unit according to the third embodiment.

The present invention will be specifically described with reference to drawings showing embodiments thereof.

First Embodiment
FIG. 1 is a diagram showing an example of the contents of an IC card 1. FIG. 1 shows the surface of the IC card 1. A contact plate 11 and a fingerprint sensor 12 are exposed on the IC card 1. A hologram, a registered name, etc. may be processed on the surface of the IC card 1 for credit card payment. The contact plate 11 is connected to a processing unit (described later) inside the IC card 1, and realizes contact communication with the outside via a connection terminal included in the contact plate 11. The fingerprint sensor 12 is a contact sensor the size of a thumb. The fingerprint sensor 12 is preferably provided at a position where a user naturally places a finger when using the IC card 1, in order to read the fingerprint of a placed finger.

Figure 2 is a block diagram showing the configuration of IC card 1. IC card 1 includes a processing unit 10, a fingerprint sensor 12, and a contactless I/F 13 that includes an antenna module for realizing contactless communication.

The processing unit 10 is a microcontroller unit (MCU) and includes a processor 100, a read only memory (ROM) 102, a random access memory (RAM) 103, and a memory 104.

The processor 100 executes processing based on the computer program 1P stored in the ROM 102. The ROM 102 stores the computer program 1P referenced by the processor 100. The computer program 1P is stored in advance during the manufacturing process of the IC card 1 and the processing unit 10. If the ROM 102 has a read mode and a rewrite mode, the computer program 1P may be read from an external storage medium by the processor 100 and stored therein.

RAM 103 is a volatile memory that temporarily stores data generated by processor 100.

Memory 104 is a non-volatile memory (non-temporary storage medium) that stores data referenced by processor 100. Memory 104 is, for example, a flash memory. A fingerprint template registered in advance by a user and multiple pieces of fingerprint data that make up this fingerprint template are stored in memory 104 at the time of manufacturing IC card 1. Memory 104 also stores fingerprint data read by fingerprint sensor 12 and a fingerprint template created based on the fingerprint data.

The processor 100 is connected to the contact plate 11 via the contact I/F 110. The processor 100 can exchange power and communicate with a wired reader/writer that also has contact terminals via multiple connection terminals provided on the contact plate 11.

The processor 100 is connected to the fingerprint sensor 12 via the internal I/F 120. The processor 100 can acquire fingerprint data read by the fingerprint sensor 12.

The processor 100 can communicate with the reader/writer via the contactless I/F 13, which includes an antenna module. The contactless I/F 13 includes an antenna coil (not shown) arranged inside along the edge of the IC card 1 as an antenna module. The processor 100 is activated when the antenna module receives radio waves transmitted from the reader/writer, and the processor 100 can communicate wirelessly with the reader/writer via the contactless I/F 13.

The fingerprint sensor 12 is a capacitance type sensor that reads the unevenness of a finger and outputs it as two-dimensional data. The fingerprint sensor 12 may also be optical, ultrasonic, or other types.

When the IC card 1 configured in this manner comes into contact with a wired reader/writer via the contact plate 11, the processing unit 10 and fingerprint sensor 12 each receive power and execute processing due to the potential connected to the terminal of the contact plate 11. Similarly, when the antenna coil of the IC card 1 receives radio waves emitted from a wireless reader/writer, power excited by the antenna coil is supplied to the processing unit 10 and fingerprint sensor 12, allowing the processing unit 10 and fingerprint sensor 12 to execute processing.

In the IC card 1 of this embodiment, the processor 100 of the processing unit 10 uses a fingerprint template stored in memory 104 to compare the fingerprint data read by the fingerprint sensor 12 with the fingerprint template, and determines that authentication has been successful if they match. In the IC card 1 of this embodiment, the processing unit 10 appropriately updates the fingerprint template that has been acquired in advance and stored in memory 104 as the card is used more frequently. This makes it possible to make appropriate judgments in response to gradual changes in the user's fingerprint and gradual deterioration of the fingerprint sensor 12.

Figure 3 is a flowchart showing an example of an authentication process procedure performed by the processing unit 10. The processing unit 10 receives power through communication with the reader/writer, and when it receives an authentication request (command), it executes the following authentication process.

The processor 100 of the processing unit 10 outputs a request to acquire fingerprint data to the fingerprint sensor 12 in response to the received authentication request (step S101). The processor 100 acquires the fingerprint data responded to by the fingerprint sensor 12 (step S102).

The processor 100 compares the fingerprint template stored in the memory 104 with the acquired fingerprint data (step S103) and calculates the match rate (step S104). The processor 100 determines whether the match rate is higher than a predetermined probability value (step S105), and if it is determined that the match rate is higher than the predetermined probability value (S105: YES), it determines that the authentication is successful (step S106).

The processor 100 stores the fingerprint data acquired in step S102 in the memory 104 (step S107). The processor 100 erases fingerprint data that is determined to be discarded from among the multiple past fingerprint data stored in the memory 104 (step S108). The processing of steps 107 and S108 may be processing in which the fingerprint data that is determined to be discarded is overwritten with newly acquired fingerprint data.

The fingerprint data that is determined to be discarded in step S108 is, for example, the oldest fingerprint data. The fingerprint data may be stored in association with time information (date and time), or older fingerprint data may be stored in an identifiable manner, such as a serial number. Other examples of fingerprint data that is determined to be discarded include data with the smallest amount of data (smallest area recognized as a fingerprint), or data with the greatest overlap with other fingerprint data.

The processor 100 creates a fingerprint template using the multiple fingerprint data stored in the memory 104 (step S109), and stores (updates) the fingerprint template in the memory 104 (step S110). The processor 100 proceeds to step S112.

If it is determined that the matching rate is equal to or lower than the predetermined probability value (S105: NO), the processor 100 determines that the authentication has failed (step S111) and proceeds to step S112.

In step S112, the processor 100 outputs the judgment result to the reader/writer (step S112) and ends the authentication process.

As described above, the fingerprint data read by the fingerprint sensor 12 is stored each time a comparison is made between the fingerprint data and the fingerprint template. In other words, the fingerprint template is updated with newer fingerprint data. This allows fingerprint authentication to be performed appropriately even if there is some change in body shape or deterioration of the fingerprint sensor 12, and makes it possible to avoid unnecessary reissues, etc. Furthermore, if the comparison determines that there is no match, the fingerprint data is not incorporated into the fingerprint template, so it is not updated with the fingerprint data of someone who is trying to use the IC card 1 improperly.

Second Embodiment
In the second embodiment, the fingerprint data to be erased is determined. The configuration of the IC card 1 in the second embodiment is similar to that of the first embodiment except for the details of the processing by the processor 100. Therefore, the same reference numerals are given to the common configurations and detailed description thereof will be omitted.

Figure 4 is a flowchart showing an example of an authentication processing procedure by the processing unit 10 of the second embodiment. Among the processing procedures shown in the flowchart of Figure 4, the processing procedures common to the processing procedures shown in the flowchart of Figure 3 of the first embodiment are assigned the same step numbers and detailed descriptions are omitted.

In the second embodiment, when the processor 100 of the processing unit 10 determines in step S105 that the matching rate is higher than a predetermined probability value (S105: YES) and determines that the authentication is successful (S106), it executes the following process.

The processor 100 creates a fingerprint template based on the fingerprint data acquired in step S102 and the remaining fingerprint data already stored in the memory 104 other than the fingerprint data that is determined to be discarded, and temporarily stores the fingerprint template (step S121). In step S121, the processor 100 determines that the oldest fingerprint data may be discarded.

The processor 100 compares the acquired fingerprint data with the fingerprint template created in step S121 (step S122) and determines whether the match rate is higher than a predetermined probability value (step S123).

If it is determined that the probability is higher than the predetermined probability value (S123: YES), the processor 100 stores the acquired fingerprint data in the memory 104 in association with the time information (order) (step S124). The processor 100 erases the fingerprint data determined in step S121 to be discardable (step S125), and stores the fingerprint template created and temporarily stored in step S121 in the memory 104 (step S126). The processor 100 advances the process to step S112.

If it is determined in step S123 that the probability is equal to or less than the predetermined probability value (S123: NO), the processor 100 skips steps S124 to S126 and proceeds to step S112.

In the second embodiment, as described above, the updated fingerprint template is updated after checking whether matching with the updated fingerprint template is problem-free. This makes it possible to perform appropriate authentication in response to changes in the fingerprint and the fingerprint sensor 12 more reliably.

(Modification)
In a modification of the second embodiment, fingerprint data that is determined to be discardable from the fingerprint data stored in the memory 104 is determined and then updated.

Figure 5 is a flowchart showing an example of an authentication processing procedure in the modified example. Among the processing procedures shown in the flowchart of Figure 5, the processing steps common to the processing procedures shown in the flowchart of Figure 3 of the first embodiment are assigned the same step numbers and detailed descriptions are omitted.

In a modified example of the second embodiment, if the processor 100 determines in step S105 that the matching rate is higher than a predetermined probability value (S105: YES) and determines that the authentication is successful (S106), it executes the following process.

The processor 100 creates multiple patterns of fingerprint templates using the remaining fingerprint data except for one of the fingerprint data already stored in the memory 104 and the fingerprint data acquired in step S102, and temporarily stores them (step S131). In step S131, the processor 100 creates fingerprint templates using the remaining fingerprint data except for each fingerprint data already stored and the newly acquired fingerprint data, for the number of fingerprint data already stored.

The processor 100 calculates the matching rate between each of the multiple fingerprint template patterns and the fingerprint data acquired in step S102 (step S132).

The processor 100 stores in the memory 104 the fingerprint template corresponding to the highest match rate among the calculated match rates and the fingerprint data acquired in step S102 (step S133). The processor 100 may determine the fingerprint template corresponding to the highest match rate, including the match rate with the already stored fingerprint templates calculated in step S104.

The processor 100 erases from the memory 104 the fingerprint data already stored that was removed when creating the fingerprint template corresponding to the highest matching rate described above (step S134). The processor 100 proceeds to step S112. In step S134, the processor 100 may erase even the fingerprint data newly acquired in step S102 if the matching rate calculated in step S104 is the highest.

As described above, in a modified example of the second embodiment, the fingerprint template that has the highest matching rate with the newly acquired fingerprint data from among the newly acquired fingerprint data and the fingerprint data already stored is stored in memory 104, along with the fingerprint data that constitutes that fingerprint template. This makes it possible to perform appropriate authentication in response to changes in the fingerprint and the fingerprint sensor 12 more reliably.

Third Embodiment
In the third embodiment, the processing unit 10 performs matching using fingerprint templates of different fingers (e.g., thumb and index finger). Fig. 6 is a block diagram showing the configuration of the IC card 1 in the third embodiment. The IC card 1 in the third embodiment has the same configuration as the IC card 1 in the first embodiment, except for the stored data and details of the processing. Therefore, the same reference numerals as in the first embodiment are used for the common configuration, and detailed description will be omitted.

As shown in FIG. 6, in the third embodiment, the memory 104 of the IC card 1 stores fingerprint templates and multiple pieces of fingerprint data that constitute each of the fingerprint templates, each corresponding to a different finger that is registered in advance by the user.

The processor 100 then updates the fingerprint templates for each different finger as the user uses the card. An example of the processing procedure performed by the processor 100 is described below.

Figure 7 is a flowchart showing an example of an authentication process procedure by the processing unit 10 of the third embodiment. The processing unit 10 receives power through communication with the reader/writer, and when it receives an authentication request (command), it executes the following authentication process.

The processor 100 of the processing unit 10 outputs a request to obtain fingerprint data to the fingerprint sensor 12 in response to the received authentication request (step S301). The processor 100 obtains the fingerprint data responded to by the fingerprint sensor 12 (step S302).

The processor 100 selects one fingerprint template from among the multiple fingerprint templates stored in the memory 104 (step S303). The processor 100 compares the selected fingerprint template with the fingerprint data acquired in step S302 (step S304) and calculates the match rate (step S305).

The processor 100 determines whether the calculated matching rate is higher than a predetermined probability value (step S306), and if it is determined that the matching rate is higher than the predetermined probability value (S306: YES), it determines that the authentication is successful (step S307).

In this case, the processor 100 stores the fingerprint data acquired in step S302 in the memory 104 (step S308). The processor 100 erases the fingerprint data that is determined to be discarded from among the past fingerprint data stored in the memory 104 (step S309). The processing of steps S308 and S309 may be processing in which the fingerprint data that is determined to be discarded is overwritten with newly acquired fingerprint data.

The fingerprint data that is determined to be discarded in step S309 is the same as that described in step S108 of the first embodiment, and a detailed description will be omitted here.

The processor 100 creates a fingerprint template using multiple pieces of fingerprint data stored in the memory 104 (step S310), and stores (updates) the fingerprint template in the memory 104 (step S311). The processor 100 proceeds to step S314.

If it is determined that the matching rate is equal to or lower than the predetermined probability value (S306: NO), the processor 100 determines whether or not a fingerprint template of another finger remains (step S312). If it is determined that a fingerprint template of another finger remains (S312: YES), the processor 100 returns the process to step S303.

If it is determined that no other fingerprint templates remain (S312: NO), the processor 100 determines that authentication has failed (step S313) and proceeds to step S314.

In step S314, the processor 100 outputs the judgment result to the reader/writer (S314) and ends the authentication process.

In the third embodiment, multiple patterns of fingerprint templates may be stored so that even if authentication fails for one finger in fingerprint authentication, authentication can be performed with a different finger. Even in a configuration in which fingerprint templates corresponding to multiple fingers are stored, it becomes possible to perform fingerprint authentication appropriately in response to changes in the fingerprint or deterioration of the fingerprint sensor 12, etc.

In the first to third embodiments, fingerprint authentication in an IC card has been described as an example. However, the subject of fingerprint template update is not limited to IC cards. For example, the above-mentioned fingerprint template update may be applied to unlocking using a fingerprint sensor in, for example, a Universal Serial Bus (USB) device that provides a lock function for information and communication.

The embodiments disclosed above are illustrative in all respects and are not restrictive. The scope of the present invention is defined by the claims, and includes all modifications within the meaning and scope of the claims.

1 IC card 10 Processing unit 100 Processor 101 ROM
104 Memory 1P Computer program 12 Fingerprint sensor

Claims (15)

A processing unit incorporated in a card having a non-transitory storage medium and a fingerprint sensor,
when fingerprint data is acquired by the fingerprint sensor, authenticating the user of the card by comparing the fingerprint data with a fingerprint template for comparison stored in the non-transitory storage medium;
determining which fingerprint data to erase from among the acquired fingerprint data and past fingerprint data stored in the non-transitory storage medium;
A fingerprint template is created and temporarily stored, the fingerprint template being composed of the remaining fingerprint data excluding the fingerprint data to be erased and the fingerprint data to be matched;
storing the remaining plurality of fingerprint data in the non-transitory storage medium;
a fingerprint template created is compared with the fingerprint data, and if a matching rate is higher than a predetermined rate, the fingerprint data to be deleted is deleted, and the fingerprint template in the non-transitory storage medium is updated with the created fingerprint template ;
If the matching rate is equal to or lower than the predetermined rate, the updating of the fingerprint template is stopped.
Information processing methods. A processing unit incorporated in a card having a non-transitory storage medium and a fingerprint sensor,
when fingerprint data is acquired by the fingerprint sensor, authenticating the user of the card by comparing the fingerprint data with a fingerprint template for comparison stored in the non-transitory storage medium;
creating a plurality of patterns of fingerprint templates, each of which is composed of a plurality of fingerprint data, using the acquired fingerprint data and a plurality of past fingerprint data stored in the non-transient storage medium, and temporarily storing the plurality of patterns of fingerprint templates;
determining, as to be deleted, fingerprint data other than the plurality of fingerprint data constituting the fingerprint template having the highest degree of match with the acquired fingerprint data among the plurality of fingerprint template patterns;
updating the fingerprint template in the non-transitory storage medium with the fingerprint template with the highest degree of match;
storing the plurality of fingerprint data constituting the fingerprint template with the highest degree of match in the non-transitory storage medium;
Information processing methods. The information processing method according to claim 1 , wherein the processing unit uses the fingerprint data that has been the subject of the comparison to create the fingerprint template when authentication is successful through the comparison. The information processing method according to claim 1 , wherein the processing unit determines the oldest fingerprint data among the past fingerprint data to be deleted. The processing unit includes:
storing fingerprint templates for matching corresponding to different fingers in the non-transitory storage medium;
The information processing method according to claim 1 , further comprising: updating the fingerprint template each time matching is performed using the fingerprint template corresponding to each of the different fingers. A processing unit incorporated in a card having a non-transitory storage medium and a fingerprint sensor,
when fingerprint data is acquired by the fingerprint sensor, authenticating the user of the card by comparing the fingerprint data with a fingerprint template for comparison stored in the non-transitory storage medium;
determining which fingerprint data to erase from among the acquired fingerprint data and past fingerprint data stored in the non-transitory storage medium;
A fingerprint template is created from the remaining fingerprint data excluding the fingerprint data to be erased and the fingerprint data to be matched, and the fingerprint template is temporarily stored.
storing the remaining fingerprint data in the non-transitory storage medium;
a fingerprint template stored temporarily in said storage medium is updated with said fingerprint data, and if a matching rate is higher than a predetermined rate by comparing said fingerprint data with a new fingerprint template stored temporarily in said storage medium, said fingerprint data being deleted is deleted, and said fingerprint template stored in said non-temporary storage medium is updated with said new fingerprint template;
If the matching rate is equal to or lower than the predetermined rate, updating of the fingerprint template is stopped. A processing unit incorporated in a card having a non-transitory storage medium and a fingerprint sensor,
when fingerprint data is acquired by the fingerprint sensor, authenticating the user of the card by comparing the fingerprint data with a fingerprint template for comparison stored in the non-transitory storage medium;
creating a plurality of patterns of fingerprint templates using the acquired fingerprint data and past fingerprint data stored in the non-transient storage medium, and temporarily storing the templates;
determining, as an object to be erased, fingerprint data other than the fingerprint data constituting the fingerprint template having the highest degree of match with the acquired fingerprint data among the plurality of fingerprint template patterns;
updating the fingerprint template in the non-transitory storage medium with the fingerprint template with the highest degree of match;
storing the fingerprint data constituting the fingerprint template with the highest degree of match in the non-transitory storage medium. a fingerprint sensor for acquiring fingerprint data;
a non-transitory storage medium for storing a fingerprint template for matching against said fingerprint data and past fingerprint data;
a processing unit for performing processing on the fingerprint data and the fingerprint template,
The processing unit includes:
when fingerprint data is acquired by the fingerprint sensor, authenticating a user by matching the fingerprint data with the fingerprint template for matching;
determining which fingerprint data to erase from among the acquired fingerprint data and past fingerprint data stored in the non-transitory storage medium;
A fingerprint template is created and temporarily stored, the fingerprint template being composed of the remaining fingerprint data excluding the fingerprint data to be erased and the fingerprint data to be matched;
storing the remaining plurality of fingerprint data in the non-transitory storage medium;
a fingerprint template created is compared with the fingerprint data, and if a matching rate is higher than a predetermined rate, the fingerprint data to be deleted is deleted, and the fingerprint template in the non-transitory storage medium is updated with the created fingerprint template ;
If the matching rate is equal to or lower than the predetermined rate, the updating of the fingerprint template is stopped.
card. a fingerprint sensor for acquiring fingerprint data;
a non-transitory storage medium for storing a fingerprint template for matching against said fingerprint data and past fingerprint data;
a processing unit for performing processing on the fingerprint data and the fingerprint template;
Equipped with
The processing unit includes:
when fingerprint data is acquired by the fingerprint sensor, authenticating a user by matching the fingerprint data with the fingerprint template for matching;
creating a plurality of patterns of fingerprint templates, each of which is composed of a plurality of fingerprint data, using the acquired fingerprint data and a plurality of past fingerprint data stored in the non-transient storage medium, and temporarily storing the plurality of patterns of fingerprint templates;
determining, as to be deleted, fingerprint data other than the plurality of fingerprint data constituting the fingerprint template having the highest degree of match with the acquired fingerprint data among the plurality of fingerprint template patterns;
updating the fingerprint template in the non-transitory storage medium with the fingerprint template with the highest degree of match;
storing the plurality of fingerprint data constituting the fingerprint template with the highest degree of match in the non-transitory storage medium;
card. a fingerprint sensor for acquiring fingerprint data;
a non-transitory storage medium for storing a fingerprint template for matching against said fingerprint data and past fingerprint data;
a processing unit for performing processing on the fingerprint data and the fingerprint template,
The processing unit includes:
when fingerprint data is acquired by the fingerprint sensor, authenticating a user by matching the fingerprint data with the fingerprint template for matching;
determining which fingerprint data to erase from among the acquired fingerprint data and past fingerprint data stored in the non-transitory storage medium;
A fingerprint template is created and temporarily stored, the fingerprint template being composed of the remaining fingerprint data excluding the fingerprint data to be erased and the fingerprint data to be matched;
storing the remaining plurality of fingerprint data in the non-transitory storage medium;
a fingerprint template created is compared with the fingerprint data, and if a matching rate is higher than a predetermined rate, the fingerprint data to be deleted is deleted, and the fingerprint template in the non-transitory storage medium is updated with the created fingerprint template ;
If the matching rate is equal to or lower than the predetermined rate, the updating of the fingerprint template is stopped.
Secure device. a fingerprint sensor for acquiring fingerprint data;
A fingerprint template for matching the fingerprint data and past fingerprint data are stored.
a non-transitory storage medium;
a processing unit for performing processing on the fingerprint data and the fingerprint template;
Equipped with
The processing unit includes:
When fingerprint data is acquired by the fingerprint sensor, the fingerprint template for matching is acquired.
authenticating the user by matching the fingerprint data;
creating a plurality of patterns of fingerprint templates, each of which is composed of a plurality of fingerprint data, using the acquired fingerprint data and a plurality of past fingerprint data stored in the non-transient storage medium, and temporarily storing the plurality of patterns of fingerprint templates;
determining, as to be deleted, fingerprint data other than the plurality of fingerprint data constituting the fingerprint template having the highest degree of match with the acquired fingerprint data among the plurality of fingerprint template patterns;
updating the fingerprint template in the non-transitory storage medium with the fingerprint template with the highest degree of match;
storing the plurality of fingerprint data constituting the fingerprint template with the highest degree of match in the non-transitory storage medium;
Secure device. an acquiring unit that acquires fingerprint data from a fingerprint sensor;
a non-transitory storage medium for storing a fingerprint template for matching against said fingerprint data and past fingerprint data;
a processing unit for performing processing on the fingerprint data and the fingerprint template,
The processing unit includes:
when the fingerprint data is acquired by the acquisition unit, authenticating the user by matching the fingerprint template for matching with the fingerprint data;
determining which fingerprint data to erase from among the acquired fingerprint data and past fingerprint data stored in the non-transitory storage medium;
A fingerprint template is created and temporarily stored, the fingerprint template being composed of the remaining fingerprint data excluding the fingerprint data to be erased and the fingerprint data to be matched;
storing the remaining plurality of fingerprint data in the non-transitory storage medium;
a fingerprint template created is compared with the fingerprint data, and if a matching rate is higher than a predetermined rate, the fingerprint data to be deleted is deleted, and the fingerprint template in the non-transitory storage medium is updated with the created fingerprint template ;
If the matching rate is equal to or lower than the predetermined rate, the updating of the fingerprint template is stopped.
Microcontroller. an acquiring unit that acquires fingerprint data from a fingerprint sensor;
A fingerprint template for matching the fingerprint data and past fingerprint data are stored.
a non-transitory storage medium;
a processing unit for performing processing on the fingerprint data and the fingerprint template;
Equipped with
The processing unit includes:
When the fingerprint data is acquired by the acquisition unit, the fingerprint template for matching and the
Authenticate the user by matching with fingerprint data,
creating a plurality of patterns of fingerprint templates, each of which is composed of a plurality of fingerprint data, using the acquired fingerprint data and a plurality of past fingerprint data stored in the non-transient storage medium, and temporarily storing the plurality of patterns of fingerprint templates;
determining, as to be deleted, fingerprint data other than the plurality of fingerprint data constituting the fingerprint template having the highest degree of match with the acquired fingerprint data among the plurality of fingerprint template patterns;
updating the fingerprint template in the non-transitory storage medium with the fingerprint template with the highest degree of match;
storing the plurality of fingerprint data constituting the fingerprint template with the highest degree of match in the non-transitory storage medium;
Microcontroller. A computer having a non-transitory storage medium and a fingerprint sensor,
when fingerprint data is acquired by the fingerprint sensor, authenticating a user by comparing the fingerprint data with a fingerprint template for comparison stored in the non-transitory storage medium;
determining which fingerprint data to erase from among the acquired fingerprint data and past fingerprint data stored in the non-transitory storage medium;
A fingerprint template is created and temporarily stored, the fingerprint template being composed of the remaining fingerprint data excluding the fingerprint data to be erased and the fingerprint data to be matched;
storing the remaining plurality of fingerprint data in the non-transitory storage medium;
a fingerprint template created is compared with the fingerprint data, and if a matching rate is higher than a predetermined rate, the fingerprint data to be deleted is deleted, and the fingerprint template in the non-transitory storage medium is updated with the created fingerprint template ;
If the matching rate is equal to or lower than the predetermined rate, the updating of the fingerprint template is stopped.
A computer program that executes a process. A computer having a non-transitory storage medium and a fingerprint sensor,
when fingerprint data is acquired by the fingerprint sensor, authenticating a user by matching the fingerprint data with a fingerprint template for matching stored in the non-transitory storage medium;
creating a plurality of patterns of fingerprint templates, each of which is composed of a plurality of fingerprint data, using the acquired fingerprint data and a plurality of past fingerprint data stored in the non-transient storage medium, and temporarily storing the plurality of patterns of fingerprint templates;
determining, as to be deleted, fingerprint data other than the plurality of fingerprint data constituting the fingerprint template having the highest degree of match with the acquired fingerprint data among the plurality of fingerprint template patterns;
updating the fingerprint template in the non-transitory storage medium with the fingerprint template with the highest degree of match;
storing the plurality of fingerprint data constituting the fingerprint template with the highest degree of match in the non-transitory storage medium;
A computer program that executes a process.

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