JP2013074432A - Information processing apparatus, information processing method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a code rhythm pattern to be properly authenticated in consideration of an operation timing error for adopting a configuration to release a lock state by the code rhythm pattern.SOLUTION: Code rhythm pattern information associated with a reference tap interval indicating timing of tap operation in accordance with a tap operation order and tap margin information indicating a margin width with respect to the reference tap interval are stored. Whether or not a rhythm pattern by the tap operation matches the code rhythm pattern is determined on the basis of whether or not tap time of the tap operation performed to a touch sensor is included in an authentication tap interval width in which the margin width is set with respect to the reference tap interval. A lock state is released in accordance with a determination result of matching. Then the margin width of the tap margin information is enabled to be changed by the user operation.

Description

  The present invention relates to an information processing apparatus, an information processing method, and a program.

  In recent years, mobile terminals such as mobile phones, smartphones, and tablet terminals have become widespread. Some of such portable terminals have a lock function that restricts an input operation as a security measure such as prevention of unauthorized use by a third party.

  As an operation for releasing a state in which the lock function is exhibited (hereinafter referred to as a locked state), an operation of inputting a personal identification number is common. However, in order to input the password, for example, it is necessary to sequentially operate an operator such as a numeric key corresponding to the number of digits of the password. It is considerably troublesome and troublesome for the user to perform such an operation every time the lock state is released. For this reason, many users use the portable terminal without setting the lock state.

  Therefore, a configuration is known in which a password rhythm pattern is registered in advance, and an operation with the same password rhythm pattern as the registered password rhythm pattern is performed with respect to a predetermined operator such as an enter key when releasing the lock state. (For example, refer to Patent Document 1). As a result, the user can release the locked state only by operating a specific key several times, and the operation becomes easier as compared with the case of inputting the personal identification number as described above.

JP 2007-323580 A

  However, when adopting a configuration in which the locked state is released by the password rhythm pattern as described above, it is necessary to consider the following. In other words, the timing when the user operates the key when releasing the lock state and the timing when the user operates the key when registering the password rhythm pattern rarely match each other, and it is more likely that a certain degree of deviation occurs. Many. Therefore, when the lock state is released by the password rhythm pattern, it is necessary to absorb the operation timing error as described above and recognize it as the password rhythm pattern. However, if the allowable range of the operation timing error for the password rhythm pattern is inadvertently widened, even rhythm patterns other than the password rhythm pattern are easily recognized as matching the password rhythm pattern, and security is weakened. turn into. In Patent Document 1, an error in the operation timing with respect to the password rhythm pattern is not considered, and therefore it is considered difficult to properly authenticate the password rhythm pattern in practice.

  Accordingly, an object of the present invention is to provide an information processing apparatus, an information processing method, and a program that can solve the above-described problems.

  The present invention has been made to solve the above-described problem, and an information processing apparatus according to an aspect of the present invention stores a reference tap interval indicating a timing for each predetermined number of tap operations as a password rhythm pattern. A storage unit that stores password rhythm pattern information and tap margin information indicating a margin width with respect to the reference tap interval, a tap operation unit that detects a tap operation, and a timing at which the tap operation detected by the tap operation unit is performed Whether or not the rhythm pattern by the tap operation matches the password rhythm pattern based on the result of collating the detected tap time indicating the reference tap interval and the authentication tap interval width in which the margin width is set with respect to the reference tap interval Rhythm pattern determination unit for determining the merging changed according to a predetermined operation for a predetermined operator And a margin setting unit for updating the tap margin information to indicate width.

  The information processing method as one aspect of the present invention includes a detection tap time indicating a timing at which a tap operation detected by the tap operation unit is performed, and a timing for each order of a predetermined number of tap operations as a password rhythm pattern. A rhythm pattern determination step for determining whether or not a rhythm pattern by the tap operation matches the password rhythm pattern based on a result of collating an authentication tap interval width in which a margin width is set with respect to a reference tap interval shown; And a margin setting step for changing the margin width according to a predetermined operation with respect to a predetermined operator.

  Further, the program as one aspect of the present invention includes a detection tap time indicating a timing at which a tap operation detected by the tap operation unit is performed on a computer, and a timing for each predetermined number of tap operations as a password rhythm pattern. A rhythm pattern determination unit that determines whether or not a rhythm pattern by the tap operation matches the password rhythm pattern based on a result of collating an authentication tap interval width in which a margin width is set with respect to a reference tap interval indicating , And functioning as a margin setting means for changing the margin width in accordance with a predetermined operation on a predetermined operator.

  According to the present invention, it is possible to perform appropriate password rhythm pattern authentication in consideration of an operation timing error when adopting a configuration in which the locked state is released by the password rhythm pattern.

It is a perspective view which shows the example of an external appearance of the portable terminal device as embodiment of this invention. It is a figure which shows the structural example of the portable terminal device as this embodiment. It is a figure which shows the function structural example of the portable terminal device as this embodiment. It is a figure which shows the structural example of the PIN code rhythm pattern information in this embodiment. It is a figure which shows typically the rhythm pattern determination process by the portable terminal device of this embodiment. It is a flowchart which shows the example of a process sequence for the password rhythm pattern registration which the portable terminal device of this embodiment performs. It is a flowchart which shows the example of a process sequence for the tap margin setting which the portable terminal device of this embodiment performs. It is a flowchart which shows the example of a process sequence for the locked state cancellation | release which the portable terminal device of this embodiment performs. It is a flowchart which shows the example of a process sequence for the rhythm pattern matching determination which the portable terminal device of this embodiment performs.

[External appearance of mobile terminal device]
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an outline of a mobile terminal device 100 according to an embodiment of the present invention. In addition, the portable terminal device 100 of this Embodiment is generally also called a smart phone, and the thing combined with the function of the mobile telephone and the function of the portable information terminal device is assumed. However, the present invention is not limited to this, and the information processing apparatus may be a mobile phone, a portable game machine, a PDA (Personal Digital Assistant), a tablet PC (Personal Computer), or a notebook PC.

  In the mobile terminal device 100 shown in FIG. 1, a display unit 107 is provided on the front panel. For example, a liquid crystal display panel is adopted as the display unit 107, and an operation screen or the like corresponding to the operation of the application is displayed. The display unit 107 may be configured as a touch panel combined with an operation panel, for example.

  A touch sensor 108 is provided below the display unit 107 on the front panel of the mobile terminal device 100. The touch sensor 108 detects a tap operation and corresponds to a tap operation unit described in the claims. The touch sensor 108 is a part where the user performs a tap operation with a password rhythm pattern when the locked state is released. For this purpose, the touch sensor 108 outputs a detection signal corresponding to the presence or absence of finger contact. The tap operation refers to an operation performed by hitting the touch sensor 108 with a finger. In addition, the method employed for the touch sensor 108 is not particularly limited, including a capacitance method and a resistive film method.

  The locked state refers to a state where an operation on a predetermined operator that forms the operation unit 106 in the mobile terminal device 100 is restricted. In the present embodiment, when the lock state is set, the mobile terminal device 100 accepts only an operation performed on the touch sensor 108, for example. The unlocked state refers to a state in which the restriction of operation input that is restricted in the locked state is released. In the present embodiment, in the unlocked state, the mobile terminal device 100 accepts all possible operations for the mobile terminal device 100.

  The password rhythm pattern refers to the timing of a plurality of tap operations on the touch sensor 108 registered in advance by the user. In the lock state, the mobile terminal device 100 according to the present embodiment performs the necessary number of tap operations on the touch sensor 108 at the same timing as the password rhythm pattern registered in advance by the user, thereby releasing the lock state from the lock state. Transition to. On the other hand, when a tap operation is performed on the touch sensor 108 at a timing different from the password rhythm pattern registered in advance, the locked state is maintained without being released.

  In addition, operation keys 171 to 177 to which predetermined functions are assigned are provided on the lower and side surfaces of the touch sensor 108 on the front panel. In addition, description about the specific content of these operation keys is abbreviate | omitted.

[Configuration example of portable terminal device]
FIG. 2 shows a configuration example of the mobile terminal device 100. In this figure, the same parts as those in FIG. A mobile terminal device 100 shown in this figure includes a CPU 101, a RAM 102, a storage unit 103, a transmission / reception unit 104, a voice input / output unit 105, an operation unit 106, a display unit 107, and a touch sensor 108. These parts are connected by a data bus 109.

  A CPU (Central Processing Unit) 101 implements a predetermined function as the mobile terminal device 100 by executing a program stored in the storage unit 103.

  The RAM 102 functions as a main storage device, and a program to be executed by the CPU 101 is read from the storage unit 103 and expanded. The RAM 102 is used as a work area when the CPU 101 executes arithmetic processing.

  The storage unit 103 functions as an auxiliary storage device, and stores programs executed by the CPU 101 and various data used by the CPU 101. As the storage unit 103, for example, a semiconductor storage device such as a hard disk or a flash memory can be employed.

  The transmission / reception unit 104 is a part that executes a transmission operation and a reception operation by wireless communication. For example, the CPU 110 transfers transmission voice data and network-compatible transmission data to the transmission / reception unit 104. The transmission / reception unit 104 modulates the transmitted transmission data and transmits it as a radio wave. In addition, the transmitting / receiving unit 104 demodulates the received radio wave, thereby acquiring a voice signal of received voice and network-compatible data. For example, the restored network compatible data is transferred to the CPU 101. The CPU 101 executes predetermined processing and control according to the transferred data. Further, the restored received voice signal is emitted from a speaker in a voice input / output unit 105 described later, for example.

  The voice input / output unit 105 collectively indicates parts corresponding to voice input and voice output. Specifically, the voice input / output unit 105 converts the transmitted voice into a voice signal using a built-in microphone as a voice input function. In addition, the voice input / output unit 105 amplifies voice signals such as received voice and various operation sounds in applications as a voice output function and emits the voice signals from the speaker.

  The operation unit 106 collectively shows operators such as various keys provided in the mobile terminal device 100. When the display unit 107 is configured as a touch panel as described above, an operation panel on the touch panel is also included in the operation element. And the operation part 106 outputs the operation signal according to operation performed with respect to the operation element. The CPU 101 executes predetermined control and processing according to the input operation signal. Thereby, a predetermined operation corresponding to the user operation is executed in the mobile terminal device 100. The display unit 107 is a part where various images are displayed according to the control of the CPU 101.

  As described above, the touch sensor 108 is a part where the user performs a tap operation based on the password rhythm pattern in order to release the locked state, and outputs a detection signal (touch sensor detection signal) according to the presence or absence of finger contact. . As the lock control, the CPU 101 recognizes the rhythm pattern of the tap operation performed by the user based on the touch sensor detection signal, and verifies whether or not it matches the registered password rhythm pattern. If a verification result that matches is obtained, the locked state is changed to the unlocked state, and if a verification result that does not match is obtained, the locked state is maintained.

[Functional configuration example of portable terminal device]
FIG. 3 shows a functional configuration example of the CPU 101 corresponding to the lock control. Further, in this figure, a touch sensor 108, an operation unit 106, and a storage unit 103 are shown as parts other than the CPU 101 related to the lock control. Also, in the figure, among the data stored in the storage unit 103, the password rhythm pattern information 130 and the tap margin information 140 are shown as data that the CPU 101 uses for lock control.

  The CPU 101 includes a password rhythm pattern registration unit 111, a margin setting unit 112, a rhythm pattern determination unit 113, a lock control unit 114, and a display control unit 115 as functional units. These functional units are realized by the CPU 101 executing a program stored in the storage unit 103.

  The password rhythm pattern registration unit 111 registers a password rhythm pattern. That is, the password rhythm pattern registration unit 111 causes the storage unit 103 to store the rhythm pattern input by the user performing a tap operation on the touch sensor 108 as the password rhythm pattern information 130. The registration mode for registering the password rhythm pattern is set by a predetermined operation on the operation unit 106.

  With reference to FIG. 4A, a structural example of the personal identification rhythm pattern information 130 will be described. As shown in the figure, the personal identification rhythm pattern information 130 has a structure in which a reference tap interval 132 is stored corresponding to each tap operation order 131. The tap operation order 131 indicates the order of a plurality of tap operations that form the personal identification rhythm pattern, and here, the tap operation order is shown in ascending order starting from “0”. That is, the tap operation order from No. 1 to N is substantially expressed as tap operation order “0” to “N−1” in the personal identification rhythm pattern information 130. In the figure, tap operation orders “0” to “4” are shown. This means that the password rhythm pattern is formed by five tap operations.

The reference tap interval 132 indicates an elapsed time starting from the timing of the tap operation in the tap operation order “0” with respect to the timing at which the tap operation in the corresponding tap operation order 131 is performed. FIG. 4B shows the relationship between the tap operation order 131 and the reference tap interval 132 according to the contents of the password rhythm pattern information 130 of FIG. That is, the time t ₀ of the tap operation timing in the tap operation order “0” is “0” because it is the starting point itself. The tap operation timings for the tap operation orders “1” to “4” are expressed as t ₁ , t ₂ , t ₃ , and t ₄ that are elapsed times from the time t ₀ . Accordingly, in the PIN rhythm pattern information 130 of FIG. 4A, the reference tap interval 132 corresponds to each of the tap operation orders 131 from “0” to “4”, and the elapsed time described above. T1, t2, t3, and t4 are stored.

  Returning to FIG. The margin setting unit 112 changes and sets the tap margin. The tap margin refers to a margin width with respect to a reference tap interval with respect to a tap operation timing performed by the user on the touch sensor 108 for canceling the state. That is, it refers to an allowable range of error with respect to the reference tap interval. The margin width value is set as a time width indicated by ± Δt with respect to the reference tap interval, for example. Further, the set margin width value is stored as tap margin information 140 in the storage unit 103.

  As shown in FIG. 4, the password rhythm pattern information 130 indicates a reference tap interval 132 for each tap operation order 131. However, even if the user actually performs a tap operation according to the password rhythm pattern, the operation timing does not completely coincide with the time indicated by the reference tap interval 132, and a certain degree of error occurs. It is inevitable. For this reason, even if the user performs a tap operation at a timing that may be considered correct according to the password rhythm pattern, an error occurs when compared with the time indicated by the reference tap interval 132 strictly. .

  Therefore, in this embodiment, the margin width is given to the reference tap interval by setting the tap margin. By setting the tap margin in this way, the error in the tap operation timing is absorbed, and the tap operation performed by the authorized user can be recognized as the password rhythm pattern and can be normally released from the locked state.

  However, if the tap margin is fixed, security may be reduced. That is, when the fixed tap margin is relatively large, it is easily recognized as a password rhythm pattern even if the variation in tap operation timing is large. Therefore, when a malicious third party appropriately estimates and performs a tap operation, there is a high possibility that this is recognized as a password rhythm pattern. On the other hand, when the fixed tap margin is relatively small, users who tend to have large variations in tap operation timing are often not authenticated correctly as a PIN rhythm pattern, making it difficult to use. Arise.

  Therefore, in the present embodiment, the margin setting unit 112 is provided so that the tap margin can be changed and set according to the security strength and usability required by the user according to the user's setting operation.

  The tap margin is set as follows. First, when the user wants to change and set the tap margin, the user sets the tap margin setting mode by a predetermined operation on the operation unit 106. In response to this, a setting screen for setting a tap margin is displayed on the display unit 107. The user sets a preferred tap margin value by operating the operation unit 106 while the setting screen is displayed. Then, a determination operation is performed. The margin setting unit 112 updates the tap margin information 140 in the storage unit 103 so that the tap margin value set according to the user operation is reflected.

  The rhythm pattern determination unit 113 determines whether or not the rhythm pattern by the tap operation matches the password rhythm pattern based on the result of collating the detected tap time indicating the timing at which the tap operation is performed with the authentication tap interval width. judge. That is, authentication is performed for the password rhythm pattern input by the user.

  Therefore, the rhythm pattern determination unit 113 recognizes a rhythm pattern of a series of tap operations performed on the touch sensor 108 as a detected tap time for each tap operation order. The detection tap time is an elapsed time for each tap operation order starting from the timing of the tap operation order “0”. Then, the rhythm pattern determination unit 113 performs verification processing based on the detected tap time for each tap operation order recognized as described above, the password rhythm pattern information 130, and the tap margin information 140.

  The determination process performed by the rhythm pattern determination unit 113 will be described with reference to FIG. In the description of this figure, it is assumed that the password rhythm pattern information 130 has the contents shown in FIG.

FIG. 5 shows a touch sensor detection signal output from the touch sensor 108 in response to the tap operation. The L level of the touch sensor detection signal corresponds to a state where the finger is not in contact, and the H level corresponds to a state where the finger is in contact. Here, the rhythm pattern determination unit 113 recognizes the timing at which the touch sensor detection signal rises to the H level as detection tap times tp ₀ , tp ₁ , tp ₂ , tp ₃ , tp ₄ corresponding to the tap operation. . In this case, the detection tap times tp ₀ , tp ₁ , tp ₂ , tp ₃ and tp ₄ are respectively the detection tap times of the tap operations performed by the user as the tap operation order “0” to “4” of the password rhythm pattern. Equivalent to.

Next, the rhythm pattern determination unit 113 detects the detected tap times tp ₀ , tp ₁ , tp ₂ , tp ₃ , tp ₄ recognized as described above, and the reference for each tap operation order stored in the password rhythm pattern information 130. The tap interval is compared as follows. That is, after making the detection tap time tp ₀ coincide with the reference tap interval t ₀ , the reference tap intervals t ₁ , t ₂ , t ₄ for the subsequent detection tap times tp ₁ , tp ₂ , tp ₃ , tp ₄ , respectively. ₃ and t ₄ are verified as to whether or not they are included in the authentication tap interval width (t ₁ ± Δt, t ₂ ± Δt, t ₃ ± Δt, t ₄ ± Δt) given the tap margin (± Δt).

In FIG. 5, each of the detection tap times tp ₁ , tp ₂ , tp ₃ , tp ₄ is included in the authentication tap interval width (t ₁ ± Δt, t ₂ ± Δt, t ₃ ± Δt, t ₄ ± Δt). It is. The rhythm pattern determination unit 113 determines that the rhythm pattern by the user's tap operation matches the password rhythm pattern when all the detected tap times are included in the corresponding authentication tap interval width as described above. . On the other hand, when at least one detection tap time is not included in the authentication tap interval width, it is determined that it does not match the password rhythm pattern.

  Returning to FIG. Based on the verification result of the rhythm pattern determination unit 113, the lock control unit 114 executes control for releasing the locked state. That is, when it is determined by the rhythm pattern determination unit 113 that the rhythm pattern of the tap operation performed by the user on the touch sensor 108 matches the password rhythm pattern, the locked state is released and the state is changed to the unlocked state. . On the other hand, when it is determined that the rhythm pattern of the tap operation does not match the password rhythm pattern, the locked state is not released. That is, the locked state is maintained.

  The display control unit 115 executes control for displaying a predetermined image on the display unit 107 in association with the password rhythm pattern recognition. For example, in response to the user starting a tap operation for inputting a rhythm pattern to the touch sensor 108, a message indicating that the rhythm pattern is being recognized is displayed. In the password rhythm pattern registration mode, a message for prompting the user to perform a tap operation for inputting the password rhythm pattern is displayed. In the tap margin setting mode, an operation screen used for the user to change and set the tap margin is displayed.

[Example of processing procedure for registering password rhythm pattern]
The flowchart in FIG. 6 illustrates an example of a processing procedure executed by the mobile terminal device 100 in order to register a password rhythm pattern. The process shown in this figure can be regarded as appropriately executed by either the password rhythm pattern registration unit 111 or the display control unit 115 shown in FIG.

  First, the password rhythm pattern registration unit 111 sets a registration mode in accordance with an operation for setting the password rhythm pattern registration mode performed on the operation unit 106 (step S101). The display control unit 115 causes the display unit 107 to display a message for prompting a tap operation as a password rhythm pattern according to the setting of the registration mode (step S102).

  Next, the password rhythm pattern registration unit 111 monitors the detection signal of the touch sensor 108 and waits for detection of a tap operation as the tap operation order “0” (NO in step S103). When a predetermined time has elapsed without performing the tap operation as the tap operation order “0” (step S104—YES), the registration mode is terminated by executing the processing shown in FIG.

  On the other hand, when it is determined that the tap operation as the tap operation order “0” has been performed within a certain time (steps S103-YES and S104-NO), the password rhythm pattern registration unit 111 displays the tap operation order "1" is substituted into a variable n indicating (step S105), and time measurement is started (step S106). That is, the elapsed time with the tap operation timing of the tap operation order “0” as the starting point (0) is measured. And it waits for next tap operation to be performed within a fixed time (step S107-NO, step S108-NO).

  Note that the fixed time in step S108 is set to be longer than the tap operation interval assumed when the user is performing a tap operation as a rhythm pattern input. That is, the passage of the predetermined time means that the tap operation as the rhythm pattern input has been completed. As a specific example of this fixed time, considering that the tap operation interval at the time of inputting the rhythm pattern is around 1 second, it can be considered to be about 3 seconds or more, for example.

If it is determined that the tap operation has been performed (step S107—YES), the personal identification rhythm pattern registration unit 111 sets the measurement time when the tap operation determined in step S107 is detected as the reference tap interval t _n . The data is stored in the RAM 102 (step S109). Then, after incrementing the variable n (step S110), the process returns to step S107. If the tap operation is performed within a predetermined time (step S107—YES), the next reference tap interval t _n corresponding to the timing of the tap operation is held (step S109).

If a predetermined time has elapsed without performing the tap operation (step S108—YES), it is considered that the tap operation for inputting the password rhythm pattern has been completed as described above. Therefore, the password rhythm pattern registration unit 111 uses the detected tap times t _{1 to} t _n corresponding to the tap operation orders “1” to “n” held so far, as illustrated in FIG. The password rhythm pattern information 130 having the above structure is created (step S111). Then, the created password rhythm pattern information 130 is stored in the storage unit 103 (step S112). In this way, the password rhythm pattern is registered according to the user operation.

[Example of processing procedure for tap margin setting]
Next, an example of a processing procedure executed by the mobile terminal device 100 for setting a tap margin is shown with reference to the flowchart of FIG. The processing shown in this figure can be regarded as appropriately executed by either the margin setting unit 112 or the display control unit 115 shown in FIG.

  First, the margin setting unit 112 sets the tap margin setting mode in accordance with the operation for setting the tap margin setting mode performed on the operation unit 106 (step S201). In accordance with the setting of the tap margin setting mode, the display control unit 115 causes the display unit 107 to display an operation screen for changing and setting the tap margin (step S202).

  Next, the margin setting unit 112 waits for an operation to change the margin width to the operation unit 106 (step S203—NO). When an operation for changing the margin width is performed (step S203—YES), the margin width is changed according to this operation and stored in the RAM 102 (step S204).

  Further, the margin setting unit 112 waits for the determination operation to be performed (step S205—NO), and when the determination operation is performed (step S203—YES), it is finally held in the RAM 102. The tap margin information 140 stored in the storage unit 103 is updated with the margin width value (step S206). Thus, the tap margin can be changed and set according to the user operation.

[Example of processing procedure for unlocking]
The flowchart of FIG. 8 shows an example of a processing procedure executed by the mobile terminal device 100 for releasing the lock state. The processing shown in this figure can be regarded as being executed by the rhythm pattern determination unit 113, the lock control unit 114, and the display control unit 115 of FIG.

  Under the state in which the lock state is set by the lock control unit 114, the rhythm pattern determination unit 113 detects the tap operation on the touch sensor 108 by monitoring the touch sensor detection signal from the touch sensor 108. (Step S302).

  When it is determined in step S302 that a tap operation has been detected (YES in step S302), this tap operation is regarded as a tap operation corresponding to the tap operation order “0”. Therefore, the display control unit 115 causes the display unit 107 to display a message indicating that the currently input rhythm pattern is being recognized, such as “under rhythm pattern recognition” (step S303). As a result, the user can know that the password rhythm pattern recognition process has started normally in response to the first tap operation.

The rhythm pattern determination unit 113 substitutes “1” for a variable n indicating the tap operation order (step S304), and starts time measurement (step S305). Time measured here represents the elapsed time tap operation of the tap operation order "0" starting from the timing used to identify sensing tap time tp _n in accordance with the timing of the subsequent tapping operation.

Next, the rhythm pattern determination unit 113 waits for the next tap operation on the touch sensor 108 to be detected within a predetermined time (step S306-NO, step S310-NO). If it is determined that a tap operation has been detected within a certain time (step S306—YES), the elapsed time measured at the timing at which this tap operation was detected is stored in the RAM 102 as the detected tap time tp _n . (Step S307).

Next, the rhythm pattern determination unit 113 increments the variable n (step S308) and returns to step S306. Accordingly, every time a tap operation is performed on the touch sensor 108 within a certain time, the detected tap time tp _n is held.

For example, it is assumed that the user has finished the tap operation for inputting the rhythm pattern. In this case, since the user does not perform any further tap operation, a certain time elapses without performing the tap operation after the timing of the last tap operation. When the rhythm pattern determination unit 113 determines that a certain time has elapsed as described above (step S309—YES), the rhythm pattern determination unit 113 executes a matching determination process (step S310). That is, it is determined whether or not the rhythm pattern (input rhythm pattern) input by the user by the tap operation matches the password rhythm pattern using the detected tap times tp _{1 to} tp _n held so far. The coincidence determination process as step S310 will be described later with reference to FIG.

  Next, the rhythm pattern determination unit 113 determines whether or not a determination result that the input rhythm pattern matches the password rhythm pattern is obtained by the matching determination process in step S310 (step S311). When the determination result that they coincide with each other is obtained (step S311-YES), the lock control unit 114 releases the lock state that has been set so far, and sets the lock release state (step S312). On the other hand, when the determination result that they do not match is obtained (step S311-NO), the lock control unit 114 returns to step S301 to maintain the lock state that has been set so far.

  Next, the coincidence determination process as step S310 in FIG. 8 will be described with reference to the flowchart in FIG. First, the rhythm pattern determination unit 113 reads the password rhythm pattern information 130 (step S401).

  Next, it is determined whether or not the number of tap operations forming the input rhythm pattern is equal to the number of tap operation orders 131 registered in the password rhythm pattern information 130 (step S402). In this determination, for example, it is determined whether or not the current variable n is equal to the maximum value of the tap operation order in the password rhythm pattern information 130 (“4” in the case of FIG. 4A). It is good as well.

  When it is determined that the number of tap operations forming the input rhythm pattern is not equal to the number of tap operation orders 131 (step S402—NO), there is no possibility that the input rhythm pattern matches the password rhythm pattern. Therefore, the rhythm pattern determination unit 113 in this case determines that the input rhythm pattern and the password rhythm pattern do not match (step S408).

  On the other hand, when it is determined that the number of tap operations for forming the input rhythm pattern is equal to the number of tap operation orders 131 (step S402—YES), the rhythm pattern determination unit 113 calculates the input rhythm pattern and the password rhythm pattern. The match determination is performed as follows.

For this purpose, the rhythm pattern determination unit 113 substitutes “1” as an initial value for the variable n indicating the tap operation order (step S403). Then, as described with reference to FIG. 5, it is determined whether or not the detection tap time tp _n is included in the authentication tap interval width (t _n ± Δt) (step S404).

When it is determined that the detection tap time tp _n is not included in the authentication tap interval width (t _n ± Δt) (step S404—NO), at this stage, at least one detection tap time tp _n is determined as the reference tap interval t _n . It is considered that they do not match. Therefore, the rhythm pattern determination unit 113 in this case determines that the input rhythm pattern and the password rhythm pattern do not match (step S408).

On the other hand, when it is determined that the detected tap time tp _n is included in the authentication tap interval width (t _n ± Δt) (step S404—YES), the detected tap time tp _n matches the password rhythm pattern. It is regarded as being. In this case, it is determined whether or not the variable n has reached the maximum value (step S405). The maximum value here is the maximum value in the tap operation order in the personal identification rhythm pattern information 130.

When it is determined that the variable n is less than the maximum value (step S405—NO), the rhythm pattern determination unit 113 increments the variable n (step S406) and returns to step S404. Thereby, it is possible to shift to the determination as to whether or not the detected tap time tp _n corresponding to the next tap operation is included in the authentication tap interval width (t _n ± Δt).

If it is determined that the variable n is the maximum value (step S405—YES), the detection tap time tpn corresponding to all tap operations in the input rhythm pattern is included in the authentication tap interval width (t _n ± Δt). It is determined that In other words, the detected tap time tp _n in the input rhythm pattern is considered to match the corresponding reference tap interval t _n . Therefore, in this case, the rhythm pattern determination unit 113 determines that the input rhythm pattern matches the password rhythm pattern (step S407). By such processing, it is determined whether or not the timing of the tap operation as the input rhythm pattern matches the password rhythm pattern.

  As described above, in the present embodiment, when performing a match determination between the rhythm pattern input by the user by the tap operation and the password rhythm pattern for releasing the lock state, the margin width (tap margin) with respect to the reference tap interval is determined. ) Is set. The tap margin can be changed and set according to a user operation.

  For example, as the tap margin is set to be small, high accuracy is required for the tap operation timing when inputting the password rhythm pattern. As a result, even if a third party appropriately performs a tap operation, the possibility of being recognized as a correct password rhythm pattern is significantly reduced, and security is enhanced. In addition, when the tap margin is set to be large, even if the timing of the tap operation for inputting the rhythm pattern is relatively appropriate, it is easily recognized as the correct password rhythm pattern, and the usability is improved. improves. Therefore, the user can set a tap margin suitable for himself in consideration of the balance between security strength and ease of use. As described above, according to the present embodiment, it is possible to appropriately perform the authentication of the password rhythm pattern according to the individuality of the user.

  In the embodiments described so far, the touch sensor 108 dedicated to inputting the password rhythm pattern is provided. However, for example, when the display unit 107 is configured as a touch panel, the touch sensor 108 may be omitted, and a password rhythm pattern may be input by an operation on the touch panel. However, various operations other than the password rhythm pattern input may be performed on the touch panel. For this reason, when the password rhythm pattern is input by the touch panel, first, an operation for setting the mode for receiving the password rhythm pattern is required in advance. On the other hand, if the touch sensor 108 dedicated to input of the personal identification rhythm pattern is provided as in the present embodiment, it is not necessary to perform the above-described prior operation, and the operation burden on the user is reduced.

  Further, as an operator for inputting a password rhythm pattern, a key, a button, or the like can be used instead of the touch sensor 108. However, when a tap operation is performed using a key or button, the key or button is pressed once, and it is difficult to perform the tap operation lightly as expected. In this regard, the touch sensor 108 is preferable for inputting a password rhythm pattern because a tap operation is performed by lightly tapping with a finger.

In the description of FIG. 9, when it is determined that the detection tap time tp _n of at least one tap operation does not coincide with the corresponding reference tap interval t _n, it is determined that it does not coincide with the password rhythm pattern. ing. However, for example, when the number of detection tap times tp _n that do not coincide with the reference tap interval t _n among the detection tap times tp _n forming the input rhythm pattern is equal to or less than a certain number or less than a certain ratio, the password rhythm It may be determined that the pattern matches.

  Further, the password rhythm pattern authentication of this embodiment is suitable for application to the authentication when releasing the lock state as described in the previous embodiments, but for example, activation of a specific application or function, etc. You may apply to another use.

  Moreover, the above-mentioned portable terminal device has a computer system inside. The process of the password rhythm pattern authentication process described above is stored in a computer-readable recording medium in the form of a program, and the above process is performed by the computer reading and executing this program. Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

  Further, the program for realizing each functional unit in FIG. 3 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into the computer system and executed, so that the description has been given so far. The password rhythm pattern authentication process may be performed. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer system” includes a WWW system having a homepage providing environment (or display environment). The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Further, the “computer-readable recording medium” refers to a volatile memory (RAM) in a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In addition, those holding programs for a certain period of time are also included.

  The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

100 mobile terminal device 101 CPU
102 RAM
DESCRIPTION OF SYMBOLS 103 Memory | storage part 104 Transmission / reception part 105 Voice input / output part 106 Operation part 107 Display part 108 Touch sensor 109 Data bus 111 Password rhythm pattern registration part 112 Margin setting part 113 Rhythm pattern determination part 114 Lock control part 115 Display control part 130 Password rhythm pattern Information 131 Tap operation order 132 Reference tap interval 140 Tap margin information

Claims (6)

A password rhythm pattern information storing a password rhythm pattern indicating a predetermined input timing of each tap operation according to an input order of a plurality of tap operations to be input, and a time interval between the input timings of each tap operation indicated by the password rhythm pattern A storage unit for storing tap margin information indicating a margin width with respect to a reference tap interval indicating
A tap operation unit for detecting the tap operation;
A rhythm generated by the tap operation based on a result of collating a detection tap interval indicating an input timing of each tap operation detected by the tap operation unit with an authentication tap interval in which the margin width is set with respect to the reference tap interval. A rhythm pattern determination unit for determining whether a pattern matches the password rhythm pattern;
An information processing apparatus comprising: a margin setting unit that updates the tap margin information so as to indicate a margin width changed according to a predetermined operation with respect to a predetermined operator. Lock control for releasing the lock state when the rhythm pattern determining unit determines that the rhythm pattern of the tap operation matches the password rhythm pattern in a locked state where operations on a predetermined operator are restricted The information processing apparatus according to claim 1, further comprising a unit. The information processing apparatus according to claim 1, wherein the tap operation unit is provided as a dedicated operation element for detecting a tap operation as the rhythm pattern in the locked state.   The information processing apparatus according to claim 1, wherein the tap operation unit is a touch sensor. The detected tap time indicating the timing at which the tap operation detected by the tap operation unit is performed, and the PIN rhythm pattern indicating the input timing determined for each tap operation according to the input order of the plurality of tap operations to be input. Whether or not a rhythm pattern by the tap operation matches the password rhythm pattern based on a result of collating an authentication tap interval width in which a margin width is set with respect to a reference tap interval indicating a time interval between input timings A rhythm pattern determination step for determining;
And a margin setting step for changing the margin width in accordance with a predetermined operation on a predetermined operator. Computer
A password rhythm pattern information storing a password rhythm pattern indicating a predetermined input timing of each tap operation according to an input order of a plurality of tap operations to be input, and a time interval between the input timings of each tap operation indicated by the password rhythm pattern Storage means for storing tap margin information indicating a margin width with respect to a reference tap interval indicating
Tap operation means for detecting the tap operation;
A rhythm generated by the tap operation based on a result of collating a detection tap interval indicating an input timing of each tap operation detected by the tap operation unit with an authentication tap interval in which the margin width is set with respect to the reference tap interval. Rhythm pattern determination means for determining whether a pattern matches the password rhythm pattern;
Margin setting means for updating the tap margin information so as to indicate a margin width changed according to a predetermined operation on a predetermined operator;
Program to function as.

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