JP7171029B2 - electronic signature device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic signature device configured to convert three-dimensional movements manipulated in air into electronic authentication information.

2. Description of the Related Art Conventionally, there is known a device that converts a three-dimensional motion that a person manipulates in the air into information that can be read by a computer (for example, see Patent Documents 1 to 3).

For example, in Patent Document 1, the movement of a mobile terminal operated in the air while being held by the user is detected based on the output from a three-axis acceleration sensor, and the movement is projected onto a virtual reference plane. A technique for reproducing as two-dimensional handwriting is disclosed.
Further, Patent Document 2 discloses that the antenna of a mobile phone is regarded as a pen, and movement of the tip of the pen detected by a CCD camera or a gyro sensor is recognized as signature handwriting of the person himself/herself. Further, Patent Document 2 suggests that a fingerprint sensor may be provided in a mobile phone in order to perform personal authentication.
In Patent Document 3, a fingerprint reading device is provided in a pen-type input device, the trajectory of the input device is read on the condition that fingerprint authentication is confirmed, and the read trajectory is compared with pre-stored handwriting information. It is disclosed that the user is determined to be the person himself/herself.

Japanese Patent No. 4675718 Japanese Patent Application Laid-Open No. 2001-268177 JP 2009-211587 A

2. Description of the Related Art In recent years, there have been an increasing number of opportunities to authenticate an individual online by electronic means, such as ordering on an electronic commerce site, remittance using an Internet bank, and agreeing and applying for various contracts in electronic documents. As such electronic personal authentication means, as a general one, handwriting written on a touch panel using an electronic pen is stored as a signature, and verification is performed based on an entered password (including a one-time password). and those that use tokens issued only to the individual by a public authentication organization have already been put into practical use.

However, the handwriting or signature authentication method has a problem that it is difficult to determine the authenticity when the handwriting is skillfully imitated. In addition, inputting a password or the like is troublesome for the user, and does not guarantee that the user entered the password.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electronic signature device that simplifies the signature input operation and increases the reliability of personal authentication.

In order to solve the above-described problems, the present invention has a main body comprising a substantially cylindrical grip and a substantially bar-shaped finger stick extending from one end of the grip, and a fingerprint sensor provided at the tip of the finger stick. , a motion sensor for detecting three-dimensional motion of the main body, a processor, and a memory or a communication interface, wherein the processor receives information about the motion of the main body detected by the motion sensor and detected by the fingerprint sensor. The electronic signature device is configured to perform a process of recording the obtained fingerprint information as authentication information of the person in the memory or a memory provided in another terminal.

In the electronic signature device, the motion sensor includes an acceleration sensor in at least three axial directions, and the processor is configured to calculate a three-dimensional position trajectory of the main body based on the acceleration detected by the acceleration sensor. is preferably

Further, in the electronic signature device, the motion sensor includes an acceleration sensor in at least three axial directions and an angular velocity sensor around three axes, and the processor detects the acceleration detected by the acceleration sensor and the angular velocity detected by the angular velocity sensor. Based on this, it is preferable that the trajectory of the three-dimensional position of the finger stick is calculated.

Further, the electronic signature device is configured such that the processor calculates an angular change of the finger rod portion with the grip portion as a rotation center, and adds information about the movement to the authentication information. Preferably.

Further, in the electronic signature device, the finger stick portion is connected to the grip portion by being bent in a "<" shape, and the tip portion of the finger stick portion provided with the fingerprint sensor is connected to the grip portion. It is preferable that the finger rod portion is rotatable about the central axis thereof within an angular range of at least 180 degrees.

According to the electronic signature device of the present invention, it is possible to simplify the signature input operation and improve the reliability of personal authentication.

1 is a front view of an electronic signature device according to one embodiment of the present invention; FIG. FIG. 2 is a perspective view illustrating the state of use of the electronic signature device of FIG. 1; 2 is a diagram for explaining the operation of a rotatable tip portion in the electronic signature device of FIG. 1; FIG. 2 is a block diagram mainly showing the configuration of an electronic circuit of the electronic signature device of FIG. 1; FIG. FIG. 4 is a diagram illustrating a movement trajectory of an electronic signature device; FIG. 10 is a diagram illustrating relative position vectors of the tip as viewed from the grip; FIG. 4 is a diagram for explaining coordinate transformation of tip relative vectors to a spatial coordinate system; FIG. 4 is a diagram for explaining a calculation method for obtaining a tip position vector in a spatial coordinate system; FIG. 10 is a diagram for explaining a method of calculating a change in angle of the finger stick with the grip as the center of rotation; 1 is a system diagram showing an example of personal authentication using an electronic signature device; FIG. FIG. 11 is a system diagram showing another example of personal authentication using an electronic signature device; FIG. 11 is a system diagram showing still another example of performing personal authentication using an electronic signature device;

An electronic signature device 1 according to a preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of the electronic signature device 1. FIG. FIG. 2 is a perspective view showing how the electronic signature device 1 is used. The main body of the electronic signature device 1 is roughly composed of a substantially cylindrical grip portion 2 and a substantially round bar-shaped finger rod portion 3 extending from one end of the grip portion 2 . The grip part 2 is a part that is held by the user's palm, and the finger rod part 3 is bent in a "<" shape at one end of the grip part 2 so as to be placed on the user's index finger. ing.

A tip portion 4 of the finger rod portion 3 has a disc shape with a slightly depressed central portion, and a fingerprint sensor 5 is provided in the central portion. The direction (normal line) of the touch pad surface of the fingerprint sensor 5 is orthogonal to the central axis direction of the finger stick portion 3 . Further, as shown in FIG. 3, the tip portion 4 provided with the fingerprint sensor 5 is attached so as to be rotatable about the central axis of the finger rod portion 3 within an angular range of at least 180 degrees.

The user can hold the electronic signature device 1 on the side where the angle of the forefinger matches the angle of the finger stick part 3 that bends in a "<" shape, regardless of whether it is the left hand or the right hand. In addition, since the tip 4 on which the fingerprint sensor 5 is provided can be rotated by 180 degrees or more, the pad of the fingerprint sensor 5 can be placed on the surface of the index finger of the hand holding the electronic signature device 1 (skin surface on the side where the fingerprint is present). to read your fingerprint.

Next, FIG. 4 is a block diagram mainly showing the configuration of electronic circuits of the electronic signature device 1. As shown in FIG. The electronic signature device 1 incorporates a processor (MPU; Micro Processing Unit) 10, a motion sensor 11, a memory 12, a communication interface 13, a battery 14 and the like in its main body.

The motion sensor 11 can adopt, for example, an IMU (Inertial Measurement Unit) equipped with an acceleration sensor capable of detecting acceleration in three axial directions and an angular velocity sensor (gyro sensor) capable of detecting angular velocity around three axes. Also, a compass capable of detecting directions on three axes may be incorporated into the motion sensor 11 . Further, a motion sensor 11 may be provided at the tip portion 4 of the finger rod portion 3 in order to directly detect the motion of the tip of the index finger.

The communication interface 13 is provided for mutual communication between the processor 10 and other information terminals such as mobile phones, tablets, and personal computers. general-purpose communication devices, such as, or these can be used in combination. Wireless communication with the information terminal is preferably performed using an encryption method with enhanced security.

In the electronic signature device 1 of this embodiment, the processor 10 calculates in time series the direction of the main body moved by the user's hand and the movement distance based on the acceleration in the three axial directions detected by the motion sensor 11. be able to. However, when the user moves the electronic signature device 1 by drawing an arc with the arm, or when the user signs by pitching the wrist, the three-axis orientation of the motion sensor 11 is interlocked with it. also change. Therefore, the processor 10 uses the angular velocities around the three axes simultaneously detected by the motion sensor 11 to obtain the accurate three-dimensional positional trajectory of the electronic signature device 1 in the spatial coordinate system, the acceleration of the main body, the movement thereof, and the like. It compensates for direction and distance.

In this specification, the term "spatial coordinate system" means a coordinate system in which the three axes of XYZ are orthogonal and the Z axis is always set in the vertical direction.

Thus, in this embodiment, the trajectory data of the three-dimensional position of the electronic signature device 1 can be calculated based on the acceleration in the three-axis direction and the angular velocity around the three axes detected by the motion sensor 11. For example, the locus of movement of the electronic signature device 1 drawn in a spatial coordinate system as shown in FIG. 5 can be used as an air signature operated by the user himself/herself. The trajectory data of the electronic signature device 1 calculated by the processor 10 is recorded in the memory 12 together with the fingerprint data detected by the fingerprint sensor 5 as the authentication information of the person.

It is assumed that a user who operates the electronic signature device 1 signs a character as if drawing a character with the index finger. If so, it is preferable to calculate and record the air sign data based on the movement of the tip of the index finger. A motion sensor 11 can be provided, for example, on the finger rod 3, preferably on the tip 4 thereof, in order to directly obtain information on the movement of the tip of the index finger (at least acceleration and angular velocity). Alternatively, even if the electronic signature device 1 has a structure in which the motion sensor 11 is provided in the grip portion 2, the three-dimensional position of the tip portion 4 can be calculated by linear conversion processing described below.

The relative direction and distance of the tip portion 4 viewed from the position of the motion sensor 11 provided on the grip portion 2 are known constants that can be measured from the dimensional structure of the electronic signature device 1 main body. That is, using these constant values, the relative vector GTr of the tip portion 4 with the grip portion 2 as the origin can be obtained in advance (see FIG. 6). Then, the processor 10 measures the inclination (orientation) of the main body of the electronic signature device 1 from the time integration of the angular velocity detected by the motion sensor 11 and the direction of the gravitational acceleration, and rotates using the inclination angle component of each axis as an element. Create the matrix M _R. Using this rotation matrix MR, the processor 10 coordinate-transforms the relative vector _GTr of the tip portion 4 into a relative vector GT in the spatial coordinate system (see FIG. 7). The coordinate-transformed vector GT is referred to as a "relative vector GT between grip tip ends".

Subsequently, the processor 10 obtains a grip portion position vector GP that is equivalent to the three-dimensional position of the motion sensor 11 based on the acceleration and angular velocity detected by the motion sensor 11 . Then, the processor 10 can calculate the three-dimensional position of the tip portion 4 in the spatial coordinate system, that is, the tip portion position vector TP, by adding the grip portion tip relative vector GT to the grip portion position vector GP. can.

The processor 10 can record the trajectory data of the finger stick portion 3, preferably the trajectory data of the tip portion 4, thus calculated in the memory 12 as the authentication information of the person. Also, a combination of the trajectory data of the grip portion 2 obtained from the output of the motion sensor 11 and the trajectory data of the finger rod portion 3, preferably its tip portion 4, may be treated as the authentication information of the person.
In this embodiment, the memory is provided on the electronic signature device side, but the memory is provided in another information terminal, and the information terminal is wirelessly connected by the communication interface 13 of the signature device side, and the movement of the main body obtained is The fingerprint information detected by the fingerprint sensor together with the information related to the information terminal may be recorded by another information terminal.
However, if the signature device is provided with a memory, it is possible to record the motion-related information and the fingerprint information on the signature device without being wirelessly connected to another information terminal. Therefore, it is considered that the mode of use of electronic signature authentication can be set more flexibly.

Furthermore, the processor 10 calculates the change in the angle of the finger rod portion 3 with the grip portion 2 as the center of rotation, and adds the transition (angle transition data) to the personal authentication information described above. may A change in the rotation angle of the finger stick 3 about the grip 2 can be treated as information reflecting a pitch motion, such as a user swinging the electronic signature device 1 with the wrist, for example.

For example, as shown in FIG. 9, the angular velocity vector ωg of the grip 2 is calculated from the change from the position GP1 of the grip 2 at time T1 to the position GP2 of the grip 2 at the next time T2. The coordinates GP<b>1 , GP<b>2 , .
Further, from the change from the position TP1 of the tip 4 at time T1 to the position TP2 of the tip 4 at the next time T2, the angular velocity vector ωt of the tip 4 during that time is calculated. The coordinates TP1, TP2, .
By calculating the difference between the angular velocity vector ωt of the tip portion 4 based on the angular velocity vector ωg of the grip portion 2, the angular velocity vector ωp of the tip portion 4 having the center of rotation at the grip portion 2 can be obtained.

According to the electronic signature device 1 of the present embodiment, the user can easily input a signature with the feeling of drawing characters in the air with his or her fingertips. Further, trajectory data of the main body of the electronic signature device 1, particularly trajectory data of the grip portion 2, trajectory data of the tip portion 4, angle transition data of the finger rod portion 3 with the grip portion 2 as the rotation center, and/or a combination thereof. It is extremely difficult for a third party to imitate, forge, or reproduce data related to three-dimensional movement. Therefore, by handling information about these movements as signature information, it is possible to increase the reliability of personal authentication.

Next, some examples of personal authentication using the electronic signature device 1 will be described.

For example, FIG. 10 illustrates a system in which the electronic signature device 1 is used as an authentication means for company employees to log in to the company's local network. If a network server stores, for example, technical information related to research and development of new products or important trade secret information related to business management, the authority to access the server is limited to specific employees, The electronic signature device 1 can be used to certify the authority.

For example, after establishing communication between the terminal 21 of the intranet 20 and the electronic signature device 1, the user uses the electronic signature device 1 to make an air signature. The electronic signature device 1 transmits a pair of fingerprint data and trajectory data to the server 22 . When the server 22 recognizes that the transmitted fingerprint data matches the fingerprint data registered by the user and that the transmitted trajectory data matches the trajectory data registered in advance by the user, User login or access can be authorized.

Alternatively, the electronic signature device 1 side may confirm the identity of the user based on the fingerprint data, search the memory 12 for the user's locus data corresponding thereto, and authenticate the identity. If there is no matching fingerprint data in the memory 12 or if there is no locus data corresponding to the fingerprint data recorded, the authentication of the operating user can be refused. When the server 22 side recognizes that the trace data authenticated by the electronic signature device 1 matches the previously registered data, the server 22 side can permit the user's request such as login.

Next, FIG. 11 shows an example of using the electronic signature device 1 to sign an electronic document when making a contract or commercial transaction online, for example. In this example, the electronic signature device 1 is wirelessly connected to a tablet PC 31, which is an information terminal connectable to the Internet. By incorporating the user's fingerprint data and signature trajectory data acquired by the electronic signature device 1 into the electronic document transmitted from the tablet PC 31 to the other party's server 32, it is possible to verify the identity and prove that the legal act is the intention of the person. can do.
In addition to signing, the electronic signature device 1 can also be used as a character input device instead of a keyboard. Therefore, this system can be expected to be applied in various situations, such as ordering products from electronic commerce sites, internet banking, online trading, contracts/purchase applications for insurance products, and changing/cancelling various registered items.

In addition, in order to assure the other party that the contract, etc. is a manifestation of intention of the person himself/herself, for example, as shown in FIG. The document may be passed on to the other party. In this system, the user himself/herself registers the trajectory data of the air sign in the server 41 of the certification authority 40 and purchases the electronic certificate issued by the certification authority 40 . The user himself/herself transmits a document with an electronic certificate to the partner server 42 . As a result, the other party can receive the electronic document in which the user's declaration of intention is guaranteed by the electronic certificate of the certification authority 40 .

1 Electronic Signature Device 2 Grip Part 3 Finger Stick Part 4 Tip Part 5 Fingerprint Sensor 10 Processor 11 Motion Sensor 12 Memory 13 Communication Interface 20 Intranet 21 Terminal 22 Server 31 Tablet PC
32 server 40 certificate authority 41, 42 server GP grip position vector GT relative vector between grip tips TP tip position vector

Claims (4)

The main body is a columnar grip and a rod- shaped finger rod extending from one end of the grip,
A fingerprint sensor provided at the tip of the finger stick, a motion sensor for detecting three-dimensional movement of the main body, a processor, a memory or a communication interface,
The processor performs a process of recording fingerprint information detected by the fingerprint sensor together with information on the movement of the main body detected by the motion sensor in the memory or a memory provided in another terminal as personal authentication information. is configured as
The finger rod part is connected to one end of the grip part by being bent in a "<" shape,
An electronic signature device according to claim 1, wherein a tip portion of said finger rod portion provided with said fingerprint sensor is rotatable in an angular range of at least 180 degrees or more around a central axis of said finger rod portion . wherein the motion sensor comprises an acceleration sensor in at least three axial directions;
2. The electronic signature device according to claim 1, wherein the processor is configured to calculate a trajectory of the three-dimensional position of the main body based on acceleration detected by the acceleration sensor. the motion sensor includes at least three-axis acceleration sensors and three-axis angular velocity sensors;
the processor
The electronic signature device according to claim 1, configured to calculate a trajectory of the three-dimensional position of the finger stick based on the acceleration detected by the acceleration sensor and the angular velocity detected by the angular velocity sensor. 4. The processor according to any one of claims 1 to 3, wherein said processor is configured to perform a process of calculating an angular change of said finger rod portion with said grip portion as a rotation center and adding information regarding said movement to said authentication information. The electronic signature device according to item 1.

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