JP6210793B2 - Update apparatus, method, and program - Google Patents

Description

  The present invention relates to a registration information updating apparatus, method, and program for biometric authentication.

  A biometric authentication technique for authenticating an individual by collating physical characteristics as authentication information with registered information stored in advance has been put into practical use. For biometric authentication, for example, shapes such as fingerprints, palm prints, irises and veins are used.

  By the way, it is known that information used for biometric authentication changes with the passage of time, and it is required to cope with aged deterioration of registered information. Therefore, a technique has been proposed in which registration information is updated when conditions regarding the number of successful authentications, random number values, similarity, update period, and the like are satisfied (see, for example, Patent Document 1).

JP 2008-65604 A

  However, in the technique of Patent Document 1, even when aged deterioration does not actually occur, registration information is updated when a predetermined condition is satisfied. Therefore, this condition may be abused by unauthorized persons.

  An object of the present invention is to provide an updating apparatus, method, and program that can cope with aging degradation of registration information in biometric authentication and can update registration information more safely.

  An update device according to the present invention is an update device for registration information in biometric authentication, wherein an acquisition unit that acquires personal biometric information, biometric information as authentication information acquired by the acquisition unit, and the registration information Based on the difference between the verification unit that collates and calculates the verification score to authenticate the individual, the difference between the verification score and the reference value at the time of successful authentication, and the cumulative point, A setting unit configured to set an update procedure of the registration information.

  The accumulation unit may update the accumulation point by multiplying a value corresponding to the difference.

  The updating device may include a measuring unit that measures a time interval from the last successful authentication, and the accumulating unit may further update the accumulated point by further adding the time interval.

  The accumulation unit may reset the accumulation point when the verification score is equal to or greater than the reference value.

  The setting unit may automatically update the registration information when the accumulated point exceeds a first threshold.

  The setting unit may update the latest authentication information whose collation score is equal to or higher than the reference value as the registration information.

  The setting unit may perform an output for prompting re-registration of the registration information when the accumulated point exceeds a second threshold.

  The setting unit may delete the registration information when the accumulated point exceeds a third threshold.

  The update device is configured such that statistical information of a matching score satisfies a predetermined condition when assuming that one piece of biological information is registered information and other piece of biological information is authentication information among a plurality of pieces of biological information acquired by the acquisition unit. In this case, a registration unit that stores the one piece of biological information as new registration information may be provided.

  The predetermined condition may be that a maximum value of the collation score is not less than a predetermined value, and a difference between the maximum value and the median value is not more than a predetermined value.

  The registration unit may register the highest value of the matching score as the reference value.

  The update method according to the present invention is an update method of registration information in biometric authentication, wherein an acquisition step of acquiring personal biometric information, and biometric information as authentication information acquired in the acquisition step, the registration information and An authentication step for verifying and authenticating an individual by calculating a verification score, an accumulation step for updating cumulative points based on a difference between the verification score and a reference value at the time of successful authentication, and according to the cumulative points, A computer executes a setting step for setting an update procedure for the registration information.

  An update program according to the present invention is an update program for registration information in biometric authentication, wherein an acquisition step for acquiring personal biometric information, and biometric information as authentication information acquired in the acquisition step are used as the registration information. An authentication step for verifying and authenticating an individual by calculating a verification score, an accumulation step for updating cumulative points based on a difference between the verification score and a reference value at the time of successful authentication, and according to the cumulative points, A setting step of setting an update procedure of the registration information.

  According to the present invention, it is possible to safely update registration information in response to aged deterioration in biometric authentication.

It is a figure which shows the function structure of the user terminal which concerns on embodiment. It is a flowchart which shows the registration method of the registration information which concerns on embodiment. It is a flowchart which shows the authentication method which concerns on embodiment. It is a flowchart which shows the update method of the registration information which concerns on embodiment.

Hereinafter, an example of an embodiment of the present invention will be described.
The user terminal 1 (update device) according to the present embodiment has a biometric authentication function when providing a service to a user, and updates registration information in the biometric authentication according to deterioration over time. Note that the type of biometric information and the authentication algorithm are not limited, and any method may be used as long as the verification information is compared with the registration information to calculate a matching score.

FIG. 1 is a diagram illustrating a functional configuration of a user terminal 1 (update device) according to the present embodiment.
The user terminal 1 is an information processing apparatus having a biometric authentication function, and includes a control unit 10, a storage unit 20, a biometric information acquisition device 30 (acquisition unit), an input unit 40, and a display unit 50.

  The control unit 10 is a part that controls the entire user terminal 1, and implements various functions in the present embodiment by appropriately reading and executing various programs stored in the storage unit 20. The control unit 10 may be a CPU (Central Processing Unit).

  The storage unit 20 is a storage area for various programs and various data for causing the hardware group to function as the user terminal 1, and may be a ROM, a RAM, a flash memory, a hard disk (HDD), or the like. Specifically, the storage unit 20 stores a program that causes the control unit 10 to execute each function of the present embodiment, and also stores registration information 21, an authentication history 22, an accumulated point 23, an update condition 24, and the like.

  The biometric information acquisition device 30 acquires biometric information of a user by a predetermined sensor at the time of registration and authentication of biometric information. The biometric information acquisition device 30 continuously acquires a plurality of pieces of biometric information from the same user at the time of registering biometric information, and provides it to the control unit 10.

  The input unit 40 is an interface device that receives an instruction input from the user to the user terminal 1. The input unit 40 includes, for example, a touch panel and operation buttons.

  The display unit 50 displays a screen for accepting data input to the user or displays a processing result screen by the control unit 10 according to display control by the control unit 10. The display unit 50 may be a display device such as a liquid crystal display (LCD) or an organic EL display.

  The control unit 10 includes a registration unit 11, an authentication unit 12, a measurement unit 13, an accumulation unit 14, and a setting unit 15.

  The registration unit 11 has a matching score (for example, 0) when assuming that one piece of biological information is registered information and other piece of biological information is authentication information among a plurality of pieces of biological information of the same user acquired by the biological information acquisition device 30. 1 real number).

When the registration unit 11 calculates the collation score for all combinations of the acquired plurality of pieces of biological information, the registration unit 11 determines whether or not the statistical information satisfies the following two conditions. The registration unit 11 stores biometric information that satisfies both the conditions as new registration information 21.
(1) The highest value of the matching score is a predetermined value or more.
(2) The difference between the maximum value and the median value is less than or equal to a predetermined value.

Here, when there are a plurality of pieces of biometric information that satisfy the conditions, the registration unit 11 determines the biometric information having the maximum maximum value as the registration information 21 and stores it.
In addition, the registration unit 11 registers the highest value among the matching scores calculated in combination with the newly registered registration information 21 as the optimum value (reference value) in the update condition 24.

The authentication unit 12 collates the biometric information as authentication information acquired by the biometric information acquisition device 30 with the registration information 21, calculates a verification score, and authenticates the individual.
Further, the authentication unit 12 stores history data such as an authentication result, authentication information, a matching score, and time in the authentication history 22.

The measuring unit 13 measures a time interval from the last successful authentication.
The measured time interval is provided to the accumulation unit 14 and used for updating the accumulation point 23.

The accumulating unit 14 updates the accumulating points 23 based on the difference between the verification score and the optimum value when the authentication is successful, and the above time interval.
Specifically, the accumulating unit 14 calculates an accumulated point P_ {i} at the time of i (i = 0, 1, 2,...) Successful authentication by the following expression.
P_ {0} = 0
P_ {i + 1} = {K1 + K2 × (A−B)} × P_ {i} + C (when A> B)
P_ {i + 1} = 0 (when A ≦ B)
However, A is an optimal value, B is a collation score, C is a time interval, and K1 and K2 are constants.

The setting unit 15 compares the calculated cumulative point P with threshold values T1 (third threshold value), T2 (second threshold value), and T3 (first threshold value), and according to the comparison result, as follows: The update procedure (a to d) of the registration information 21 is set.
(A) When P> T1, the registration information 21 is deleted, and the registration unit 11 re-registers it.
(B) When T2 <P ≦ T1, an output prompting re-registration of the registration information 21 is performed.
At this time, the setting unit 15 receives a selection input as to whether or not to perform re-registration from the user. When the selection not to perform re-registration is made, if the number of times set in (b) exceeds a predetermined value, the registration information 21 may be canceled and re-registered as in (a).

(C) When T3 <P ≦ T2, the registration information 21 is automatically updated.
At this time, the setting unit 15 sets the latest authentication information with the matching score at the time of authentication equal to or greater than the optimum value A as the registration information 21. Further, the matching score at this time may be stored as a new optimum value A.
(D) When P ≦ T3, the registration information 21 is retained without being updated.

Here, the above constant is, for example, the following value, and is stored in the update condition 24.
K1 = 0.5
K2 = 10
T1 = 2160 (hours)
T2 = 1440 (hours)
T3 = 720 (hours)
These values may be updated as appropriate. Each constant may be set by appropriately switching according to the type of biological information used.

FIG. 2 is a flowchart showing a registration method of the registration information 21 according to the present embodiment.
In step S1, the biological information acquisition device 30 acquires a plurality of biological information from the user.

  In step S2, the registration unit 11 calculates the collation score of the combination of the plurality of pieces of biometric information acquired in step S1, and the maximum value and median value of the collation score as statistical values.

  In step S3, the registration unit 11 determines whether there is biometric information that satisfies the registration condition. If this determination is YES, the process proceeds to step S4, and if the determination is NO, the process returns to step S1.

  In step S <b> 4, the registration unit 11 updates the registration information 21 with the biometric information having the highest collation score among the biometric information satisfying the registration condition.

  In step S <b> 5, the registration unit 11 determines an optimum value from the highest value of the matching score and stores it in the update condition 24.

FIG. 3 is a flowchart showing the authentication method according to the present embodiment.
In step S <b> 11, the authentication unit 12 acquires user authentication information from the biometric information acquisition device 30.

  In step S12, the authentication unit 12 calculates a matching score with the registration information 21 for the authentication information acquired in step S11.

  In step S <b> 13, the authentication unit 12 determines whether the authentication is successful based on the matching score. If this determination is YES, the process proceeds to step S14, and if the determination is NO, the process returns to step S11.

  In step S <b> 14, the authentication unit 12 stores authentication information at the time of successful authentication, time information, and a matching score in the authentication history 22.

FIG. 4 is a flowchart showing a method for updating the registration information 21 according to this embodiment.
In step S21, the measurement unit 13 measures a time interval from the previous successful authentication.

  In step S22, the accumulating unit 14 calculates the accumulated point P using the collation score, the optimum value, and the time interval when the authentication is successful.

  In step S23, the setting unit 15 determines whether or not the accumulated point P has exceeded the threshold value T1. If this determination is YES, the process proceeds to step S26, and if the determination is NO, the process proceeds to step S24.

  In step S24, the setting unit 15 determines whether or not the accumulated point P has exceeded the threshold value T2. If this determination is YES, the process proceeds to step S27, and if the determination is NO, the process proceeds to step S25.

  In step S25, the setting unit 15 determines whether or not the accumulated point P has exceeded the threshold value T3. If this determination is YES, the process proceeds to step S29, and if the determination is NO, the process ends.

  In step S26, the setting unit 15 cancels the registration information 21, causes the biometric information to be re-registered by the registration process (FIG. 2), and ends this process.

  In step S27, the setting unit 15 determines whether or not to re-register biometric information based on a selection input from the user. If this determination is YES, the process proceeds to step S26, and if the determination is NO, the process proceeds to step S28.

  In step S <b> 28, the setting unit 15 counts the number of processes in this step and determines whether or not the number is greater than or equal to a predetermined number. If this determination is YES, the setting unit 15 resets the count, and the process proceeds to step S26. On the other hand, if the determination is NO, the process ends with the count held.

  In step S29, the setting unit 15 automatically updates the registration information 21 with the latest authentication information whose collation score exceeds the optimum value.

  As described above, according to the present embodiment, the user terminal 1 updates the accumulated points 23 based on the difference between the matching score and the optimum value, and sets the update procedure for the registration information 21 according to the accumulated points 23. To do. Therefore, the user terminal 1 can cope with aging deterioration in biometric authentication, and can safely update the registration information 21 by adopting an update procedure according to the matching score.

Since the accumulated points 23 are updated by multiplying a value corresponding to the difference between the matching score and the optimum value, the user terminal 1 is sensitive to aged deterioration of the biological information and efficiently updates the registered information 21. it can.
In addition, since the accumulated points 23 are updated by adding a time interval from the last successful authentication, the user terminal 1 can evaluate elapsed time and appropriately determine aged deterioration.
Furthermore, when the collation score is equal to or higher than the reference value, the accumulated points 23 are reset, so that the user terminal 1 can suppress the update of the registration information 21 when no deterioration over time is recognized.

The user terminal 1 has a stage corresponding to the accumulated points 23 as an update procedure of the registration information 21. The user terminal 1 can reduce the load on the user by automatic updating, and can maintain the registration information 21 appropriately by prompting re-registration or forcing re-registration when deterioration over time progresses.
In addition, in the case of automatic updating, the user terminal 1 uses the latest authentication information whose collation score is equal to or higher than the reference value as the registered information 21, so that it is easy and safe without newly acquiring biometric information. The registration information 21 can be updated.

Further, the user terminal 1 acquires a plurality of pieces of biological information, and uses the biological information in which the statistical information of the matching score satisfies a predetermined registration condition as registered information. Thereby, the user terminal 1 can register biometric information appropriately, and as a result, abuse of the update process can be prevented and safety can be improved.
The user terminal 1 can easily determine appropriate biometric information based on the condition that the maximum value of the matching score is equal to or greater than a predetermined value and the difference between the maximum value and the median is equal to or less than the predetermined value.

  Furthermore, the user terminal 1 uses the highest value of the matching score among the statistical information as an optimum value, and uses it for updating the accumulated points 23. Thereby, the accumulation point 23 is updated appropriately, and the user terminal 1 can appropriately evaluate the aging deterioration.

  As mentioned above, although embodiment of this invention was described, this invention is not restricted to embodiment mentioned above. Further, the effects described in the present embodiment are merely a list of the most preferable effects resulting from the present invention, and the effects of the present invention are not limited to those described in the present embodiment.

  The biometric information updating method by the user terminal 1 is realized by software. When realized by software, a program constituting the software is installed in the information processing apparatus (user terminal 1). These programs may be recorded on a removable medium such as a CD-ROM and distributed to the user, or may be distributed by being downloaded to the user's computer via a network.

  The functions of the user terminal 1 may be distributed to a plurality of information processing apparatuses. For example, a biometric information acquisition device or an authentication server, or both may be provided outside and each may communicate with the user terminal 1.

1 User terminal (update device)
DESCRIPTION OF SYMBOLS 10 Control part 11 Registration part 12 Authentication part 13 Measurement part 14 Accumulation part 15 Setting part 20 Storage part 21 Registration information 22 Authentication history 23 Cumulative point 24 Update condition 30 Biometric information acquisition device 40 Input part 50 Display part

Claims (13)

An apparatus for updating registration information in biometric authentication,
An acquisition unit for acquiring personal biometric information;
An authentication unit that verifies biometric information as authentication information acquired by the acquisition unit with the registration information, calculates a verification score, and authenticates the individual;
Said matching score of successful authentication, the evaluation value of the deterioration of the difference based Dzu rather the registration information of a set reference value at the time of registration of the registration information, the accumulation unit that updates the accumulated points,
An update device comprising: a setting unit configured to set an update procedure of the registration information in accordance with a degree of deterioration of the registration information represented by the accumulated points.   The update apparatus according to claim 1, wherein the accumulation unit multiplies a value according to the difference to update the accumulation point. It has a measuring unit that measures the time interval from the last successful authentication,
The update device according to claim 1, wherein the accumulation unit further updates the accumulation point by further adding the time interval.   The update device according to claim 1, wherein the accumulation unit resets the accumulation point when the collation score is equal to or greater than the reference value.   The update apparatus according to claim 1, wherein the setting unit automatically updates the registration information when the accumulated point exceeds a first threshold.   The update device according to claim 5, wherein the setting unit updates the latest authentication information whose collation score is equal to or greater than the reference value as the registration information.   The update device according to any one of claims 1 to 6, wherein the setting unit performs an output prompting re-registration of the registration information when the accumulated point exceeds a second threshold.   The update device according to any one of claims 1 to 7, wherein the setting unit deletes the registration information when the accumulated points exceed a third threshold.   Of the plurality of pieces of biological information acquired by the acquisition unit, when one piece of biological information is registered information and the other piece of biological information is authentication information, the statistical information of the matching score satisfies the predetermined condition. The update apparatus in any one of Claims 1-8 provided with the registration part which memorize | stores the biometric information as new registration information.   The update apparatus according to claim 9, wherein the predetermined condition is that a maximum value of the collation score is equal to or greater than a predetermined value, and a difference between the maximum value and the median value is equal to or less than a predetermined value.   The update device according to claim 9 or 10, wherein the registration unit registers the highest value of the matching score as the reference value. A method for updating registration information in biometric authentication,
An acquisition step of acquiring personal biometric information;
An authentication step of verifying biometric information as authentication information acquired in the acquisition step with the registration information, calculating a verification score, and authenticating an individual;
Said matching score of successful authentication, the evaluation value of the deterioration of the difference based Dzu rather the registration information of a set reference value at the time of registration of the registration information, and cumulative updating the accumulated points,
An update method in which a computer executes a setting step of setting an update procedure of the registration information in accordance with a degree of deterioration of the registration information represented by the accumulated points. An update program for registration information in biometric authentication,
An acquisition step of acquiring personal biometric information;
An authentication step of verifying biometric information as authentication information acquired in the acquisition step with the registration information, calculating a verification score, and authenticating an individual;
Said matching score of successful authentication, the evaluation value of the deterioration of the difference based Dzu rather the registration information of a set reference value at the time of registration of the registration information, and cumulative updating the accumulated points,
An update program for causing a computer to execute a setting step of setting an update procedure of the registration information in accordance with a degree of deterioration of the registration information represented by the accumulated points.

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