WO2023238742A1

WO2023238742A1 - Smartphone-use fingerprint authentication function-equipped contactless ic card reading auxiliary circuit

Info

Publication number: WO2023238742A1
Application number: PCT/JP2023/020153
Authority: WO
Inventors: 雅也沖田
Original assignee: 有限会社ムーター
Priority date: 2022-06-06
Filing date: 2023-05-30
Publication date: 2023-12-14
Also published as: TW202403598A; TW202403571A

Abstract

[Problem] To provide a smartphone-use fingerprint authentication function-equipped contactless IC card reading auxiliary circuit that enables a fingerprint authentication function-equipped contactless IC card to be read on a smartphone and thereby makes it possible to use a fingerprint authentication function on the smartphone. [Solution] This auxiliary circuit is installed in a smartphone having a built-in contactless IC card reader, such that an NFC chip is recognized in an initial response in NFC communication of the contactless IC card reader, and power is thereby supplied continuously to a fingerprint authentication function-equipped contactless IC card, making it possible for the fingerprint authentication function to be used on the smartphone.

Description

Contactless IC card reading auxiliary circuit with fingerprint authentication function for smartphones

The present invention relates to a non-contact IC card reading auxiliary circuit with a fingerprint authentication function for smartphones, which can add a fingerprint authentication function to a smartphone with a built-in non-contact IC card reader.
Background technology

In recent years, smartphones have been used in various fields. To prevent unauthorized use of smartphones by others, smartphones are equipped with an identity verification function. For example, the device may be locked so that it cannot be operated after a certain period of time has elapsed since the start of the operation to prevent others from using it. Verify your identity to unlock. When making various payments using your smartphone, you will be asked to enter a four-digit number to verify your identity. This includes fingerprint authentication and facial recognition.

In the past, the iPhone (registered trademark) from Apple Inc., which has a large share of the global market for smartphones, had a built-in fingerprint authentication function to verify the user's identity. However, the latest iPhone models do not have a built-in fingerprint authentication function, except for some low-priced models. The latest iPhone models only have a built-in facial recognition function.

The following problems have been pointed out regarding the face recognition function based on the characteristics of the face recognition algorithm. In other words, there is a possibility that a person with similar characteristics, such as a relative, may be mistakenly authenticated as the person, even if the person looks different from the person. Since the year before last, people have been using their smartphones while wearing masks, especially in Japan, to prevent the spread of the new coronavirus. Wearing a mask makes facial recognition difficult. Because the face recognition function has such drawbacks, there is a strong demand for smartphones to be able to use a fingerprint recognition function in addition to face recognition.

If it is a personal computer (PC) or the like, it is easy to add a fingerprint authentication device as a retrofit. However, it is difficult to retrofit fingerprint authentication devices for PCs to smartphones, which are small mobile terminals, due to the size and interface.

Even if a fingerprint authentication device is developed specifically for smartphones, it is difficult to make it as easy to use as a built-in fingerprint authentication device. That is, if a wired connection is made to the external interface of the smartphone in order to supply power to the fingerprint authentication device and to communicate with the smartphone, not only does the cable get in the way, but it also becomes difficult to manage the smartphone itself. Furthermore, if the fingerprint authentication device is removed to use the external interface for another device or to charge a smartphone, the fingerprint authentication device cannot be used immediately when needed.

As is well known, in recent years, from the perspective of further strengthening security, there has been a demand for authentication using multi-factor authentication that combines multiple authentication functions. In addition, a new method called SIM swap attack that disables facial recognition and fingerprint authentication built into smartphones has caused large amounts of damage overseas, and it is expected that damage will increase rapidly in Japan in the future. As an urgent issue, there is a need for biometric authentication devices that are also effective against SIM swap attacks.

When trying to use the fingerprint authentication function on a smartphone using a contactless IC card with a fingerprint authentication function as a biometric authentication device, it is not possible to continuously supply power from the contactless IC card reader to the coil with the installed application software alone. Even if you try to operate a contactless IC card with a fingerprint authentication function, if the card performs NFC communication from the IC chip to the contactless IC card reader only when the same fingerprint is authenticated, continuous power supply from the contactless IC card reader will not be possible. The fingerprint verification cannot be completed. Therefore, it was not possible to use the fingerprint authentication function of a contactless IC card with a fingerprint authentication function on a smartphone.

An object of the present invention is to provide a non-contact IC card reading auxiliary circuit with a fingerprint authentication function for smartphones that can add usability to a smartphone equivalent to that of a fingerprint authentication device built into a smartphone. A further object of the present invention is to provide a contactless IC card reading auxiliary circuit for smartphones with a fingerprint authentication function that is compatible with multi-factor authentication that combines multiple authentication functions and is also effective against SIM swap attacks. be.

According to the present invention, the above problem can be solved by:
It is attached to a smartphone with a built-in non-contact IC card reader, and the smartphone can be operated while attached,
A non-contact IC card reading auxiliary circuit with a fingerprint authentication function that enables a smartphone to use a non-contact IC card with a fingerprint authentication function or a fingerprint authentication function built in a fingerprint authentication function circuit board,
The non-contact IC card with fingerprint authentication function or the fingerprint authentication function circuit board,
a fingerprint sensor,
A fingerprint authentication section,
A memory for storing fingerprint data for verification,
a first coil receiving power from the contactless IC card reader;
A fingerprint authentication means including an IC chip having a function of NFC communication with the non-contact IC card reader,
The fingerprint authentication means is
a fingerprint data reading function that starts reading fingerprint data using the fingerprint sensor when the first coil receives power from the contactless IC card reader;
a fingerprint data matching function for matching the read fingerprint data with the matching fingerprint data stored in the memory by the fingerprint authentication unit;
It has a fingerprint authentication notification function that performs the NFC communication from the IC chip to the non-contact IC card reader only when the same fingerprint is authenticated by the fingerprint authentication unit, and notifies that the fingerprint has been authenticated as the same fingerprint. Built-in fingerprint authentication function,
The fingerprint sensor, the fingerprint authentication unit, the memory, and the IC chip operate only with the power received by the first coil,
The smartphone is a model that cannot continuously supply power from the contactless IC card reader to the first coil with only the application software installed on the smartphone,
The non-contact IC card reading auxiliary circuit with fingerprint authentication function includes:
an NFC chip different from the IC chip;
comprising a second coil different from the first coil,
When the second coil receives power from the contactless IC card reader, the second coil recognizes the other NFC chip in the initial response of the NFC communication, thereby causing the contactless IC card reader to receive power from the first coil. Continuously supplies power to the coil,
completing the fingerprint authentication by the fingerprint authentication unit;
This is achieved by providing a non-contact IC card reading auxiliary circuit with a fingerprint authentication function for a smartphone, which is characterized in that the fingerprint authentication notification is sent when the fingerprint authentication is successful.

The non-contact IC card reading auxiliary circuit with a fingerprint authentication function according to the present invention is applied to a smartphone in which continuous power cannot be supplied from the non-contact IC card reader to the coil using application software alone. When power is received from the contactless IC card reader by the second coil of the auxiliary circuit, the NFC chip is recognized in an initial response of NFC communication. This recognition enables continuous power supply from the non-contact IC card reader to the coil, and fingerprint authentication begins. If the same fingerprint is authenticated, the non-contact IC card reader receives a fingerprint authentication notification from the IC chip. In this way, by installing a non-contact IC card reading auxiliary circuit with fingerprint authentication function, fingerprint authentication is performed, and by notifying the smartphone that the fingerprint has been authenticated, it is possible to perform fingerprint authentication function without wired connection. Can be used with smartphones.

The fingerprint authentication function circuit board that performs fingerprint authentication such as the circuit board of the non-contact IC card reading auxiliary circuit with fingerprint authentication function for smartphones, the fingerprint sensor, the fingerprint authentication unit, the memory, the coil, etc. can be constructed from a very thin printed circuit board, so it is suitable for smartphones. The fingerprint authentication function circuit board can be incorporated into a case without increasing the thickness, and by laminating both sides of the fingerprint authentication function circuit board with thin plastic plates, it can be processed into an IC card shape to create a non-contact IC card with a fingerprint authentication function. is also possible. Furthermore, since it can operate wirelessly using NFC, it can provide the same usability as a built-in fingerprint authentication device.

According to a preferred embodiment of the present invention, high security is provided based on two-factor authentication by confirming on the smartphone side that the data using the unique data of the IC chip matches the registered data on the smartphone side. can. The auxiliary circuit board and non-contact IC card with fingerprint authentication function or the fingerprint authentication function circuit board operate by wireless power supply from the non-contact IC card reader. There is no need to install a battery in the device, and there are no problems with maintenance such as charging or battery deterioration.

In recent years, contactless IC card readers in smartphones have to not only read cards, but also communicate with various external devices such as electronic money payments. In the embodiment of the present invention, the IC chip that performs NFC communication built in the non-contact IC card with fingerprint authentication function or the fingerprint authentication function circuit board is activated only when the same fingerprint is authenticated. Without it, the IC chip that performs NFC communication will not operate.

The embodiments of the present invention can be used when a contactless IC card reader performs NFC communication with another IC card using another application software, or when performing NFC communication with various external devices including an external contactless IC card reader. can be used without interfering with NFC communication.

FIG. 1 is a block diagram of a fingerprint authentication system related to the present invention. 2 is a flowchart for explaining an example of the operation of application software installed on a smartphone in order to control the fingerprint authentication system related to the present invention on the smartphone side. FIG. 1 is an explanatory diagram of a first embodiment of the structure of a fingerprint authentication system related to the present invention. 4 is a cross-sectional view of the structure shown in FIG. 3. FIG. FIG. 2 is an explanatory diagram of a second embodiment of the structure of a fingerprint authentication system related to the present invention. 6 is a cross-sectional view of the structure shown in FIG. 5. FIG. It is a timing chart of the 1st example for explaining the electric power feeding state to a coil. It is a timing chart of the 2nd example for explaining the electric power feeding state to a coil. It is a timing chart of the 3rd example for explaining the electric power feeding state to a coil. It is a timing chart of the 4th example for explaining the electric power feeding state to a coil. It is a timing chart of the 5th example for explaining the electric power feeding state to a coil. It is a timing chart of the 6th example for explaining the power supply state to a coil. FIG. 1 is a block diagram of a fingerprint authentication system related to the present invention. FIG. 3 is a cross-sectional view for explaining the relative positions of the smartphone and the second coil. FIG. 3 is a cross-sectional view for explaining the relative positions of the smartphone and the second coil. It is an explanatory view for explaining arrangement of a 2nd coil with respect to a smartphone. 14 is a cross-sectional view for explaining the fingerprint authentication system of FIG. 13. FIG. 14 is a cross-sectional view for explaining the fingerprint authentication system of FIG. 13. FIG.

FIG. 1 is a block diagram of a fingerprint authentication system related to the present invention. The inventor of the present application first thought of incorporating a fingerprint authentication function into a smartphone case and connecting it via NFC. In the figure, reference numeral 1 is a case with a fingerprint authentication function for a smartphone. 2 is a thin capacitive fingerprint sensor. 3 is a fingerprint authentication section. 4 is a memory that stores fingerprint data for verification. 5 is a coil that receives power from the contactless IC card reader. 6 is an IC chip having a function of NFC communication, and is typically a FeliCa (registered trademark) chip. Reference numeral 7 indicates the user's finger whose fingerprint has been registered. Reference numeral 8 is a smartphone. A smartphone case 1 with a fingerprint authentication function is attached to a smartphone 8. Reference numeral 9 is a non-contact IC card reader built into the smartphone 8.

In the embodiment of the present invention shown in FIG. 1, the illustrated fingerprint authentication system includes devices mounted on a smartphone case 1 with a fingerprint authentication function, that is, a fingerprint sensor 2, a fingerprint authentication unit 3, and a memory 4 for storing fingerprint data for comparison. , the coil 5, and the IC chip (Felica chip 6) constitute a fingerprint authentication means Fp. In the fingerprint authentication means Fp, on the condition that power is supplied to the coil 5 from the non-contact IC card reader 9 built in the smartphone 8, the coil 5 that receives power is connected to the fingerprint sensor 2 and the fingerprint authentication unit 3. , the memory 4, etc., and fingerprint authentication is started. At this time, the fingerprint authentication unit 3 controls the Felica chip 6 so that the Felica chip 6 does not operate, such as by stopping the power supply to the Felica chip 6.

After the start of fingerprint authentication, when the finger 7 whose fingerprint has been registered in advance touches the fingerprint sensor 2, the fingerprint authentication unit 3 uses the fingerprint data of the finger 7 read from the fingerprint sensor 2 and the verification fingerprint data stored in the memory 4. Compare with. If the same fingerprint is authenticated by this comparison, the Felica chip 6 is controlled to operate the Felica chip 6. Thereby, the non-contact IC card reader 9 is in a state where it can read the IDm data of the Felica chip 6. This state is maintained until the power supply to the coil 5 is stopped.

On the other hand, before the fingerprint is authenticated or when the same fingerprint is not authenticated, the fingerprint authentication unit 3 controls the Felica chip 6 so as not to operate, and the state in which the IDm data cannot be read is maintained. By the above-described control, the IDm data of the Felica chip 6 can be read by the non-contact IC card reader 9 only when the same fingerprint is authenticated. In other words, if the same fingerprint is not authenticated, the IDm data of the Felica chip 6 cannot be read by the non-contact IC card reader 9.

IDm data is a unique ID number recorded at the time of manufacturing the Felica chip. IDm data cannot be rewritten. Therefore, there are no other Felica chips with the same IDm data. Firstly, the IDm data of the Felica chip 6 can be read by the contactless IC card reader 9, and secondly, the IDm data registered in the smartphone 8 in advance and the IDm data of the Felica chip 6 match. The smartphone 8 is configured to be able to recognize that "fingerprint authentication was successful using the smartphone case 1 with a fingerprint authentication function" only when two conditions are satisfied. In this case, the smartphone 8 is authenticated using two factors: the fingerprint and the IDm data of Felica, and can provide higher security than simple fingerprint authentication using only the fingerprint.

In the fingerprint authentication system shown in FIG. 1, a Felica chip 6 is used as an IC chip that performs NFC (Near Field Communication) communication with a non-contact IC card reader 9. For example, the contactless IC card reader 9 supports NFC standard wireless communication, so if it is an IC chip that can perform NFC communication, you can use another NFC standard IC chip such as Mifare (registered trademark). It's okay.

In the fingerprint authentication system shown in FIG. 1, the method of notifying the non-contact IC card reader 9 when the fingerprint authentication unit 3 "authenticates the same fingerprint" is realized by making the IDm data readable. ing. As a modification, other data or a combination of IDm and other data may be made readable.

The method for realizing the above-mentioned notification method is to simply send predetermined data to the Felica chip 6 when the fingerprint authentication unit 3 authenticates the same fingerprint based on a predetermined command from the contactless IC card reader 9, and This can also be realized by the IC card reader 9 receiving the information. However, even if the fingerprint authentication unit 3 does not authenticate the same fingerprint by transmitting the same data as the above-determined data to the card reader 9 by some other means, it will be recognized as "authenticated as the same fingerprint". There is a risk that it may be misused as a way to break security, so you need to be careful about this abuse.

Regarding this abuse, for example, if a case 1 with a fingerprint authentication function for a smartphone in which a different fingerprint has been registered is attached to the smartphone 8, in order to prevent the smartphone from operating as if "the fingerprint has been authenticated", the smartphone It is preferable to take measures such as providing unique data on the case 1 side with a fingerprint authentication function and making it an additional necessary condition for successful fingerprint authentication to match the data registered on the smartphone 8 side. .

In the fingerprint authentication system shown in FIG. 1, the notification method is realized by transmitting the IDm data of the Felica chip 6. As described above, since there are no Felica chips with the same IDm data, it is difficult to break security without performing fingerprint authentication as described above. That is, it is practically difficult to break security by using some means to make the smartphone 8 recognize that "the fingerprints have been authenticated as the same".

IDm is used for general security card authentication, but there are currently no major problems. However, there is an opinion that it is possible to forge IDm because the communication method etc. are disclosed. Another problem with general Felica cards is that IDm data can be easily read by skimming. In the fingerprint authentication system shown in FIG. 1, the fingerprint authentication unit 3 is controlled so that IDm data can be read only when the same fingerprint is authenticated. As a result, skimming is impossible unless the fingerprint is authenticated as the same, so the risk of skimming can be significantly reduced.

As countermeasures against IDm counterfeiting of FeliCa cards, proposals have been made such as a method of performing MAC authentication using a secret key for the FeliCa Lite-S chip, and a method of using a secure area for the FeliCa Standard chip. Such a method can be appropriately applied to the notification method of the fingerprint authentication system shown in FIG.

In the fingerprint authentication system shown in FIG. 1, when power supply from the non-contact IC card reader 9 starts, the IC chip (Felica chip 6) that performs NFC communication until the fingerprint authentication unit 3 authenticates the same fingerprint. is controlled so that it does not operate. This allows (i) when the contactless IC card reader 9 built into the smartphone 8 reads another contactless IC card, and (ii) when the contactless IC card reader 9 built into the smartphone 8 reads electronic money. When performing NFC communication with various external devices such as, even if power is also supplied to the coil 5 inside the smartphone case 1, the fingerprint authentication unit 3 uses the IC chip (Felica chip 6) that performs the NFC communication. ) is controlled to not work. By controlling this IC chip (Felica chip 6) to not operate, it is possible to prevent interference with NFC communication of the non-contact IC card reader 9.

Therefore, without fingerprint authentication, the smartphone 8 can be used for various purposes using the built-in non-contact IC card reader 9 without any problem. For various purposes using the non-contact IC card reader 9, there is no need to remove the smartphone case 1 with a fingerprint authentication function from the smartphone 8. When the non-contact IC card reader 9 built into the smartphone 8 wants to perform NFC communication with various external devices such as electronic money payment immediately after the fingerprint authentication is successful, the message "The same fingerprint was authenticated" is displayed. After the smartphone 8 recognizes this, the power supply from the non-contact IC card reader 9 is temporarily stopped, so that the IC chip (Felica chip 6) that performs NFC communication inside the smartphone case 1 can be made inoperable.

In the fingerprint authentication system illustrated in FIG. 1, an example of a method for controlling the electronic circuit built in the smartphone case 1 with a fingerprint authentication function by the smartphone 8 will be explained based on the flowchart illustrated in FIG. 2.

When the application software installed on the smartphone 8 is started, in the first step S1, a message "Please touch the fingerprint sensor" is displayed on the display of the smartphone 8 shown in FIG. 1, and then a built-in timer is started (S2). . In this software, a command to turn on polling is sent to the non-contact IC card reader 9 (S3), and the non-contact IC card reader 9 starts polling and supplies power to the coil 5.

The coil 5 that receives power supplies power to the fingerprint sensor 2, fingerprint authentication section 3, memory 4, etc. This starts fingerprint authentication. This software repeats polling until the timer reaches 0.5 seconds in the next step S4. The polling execution time is set to be equal to or shorter than the time required for the fingerprint authentication unit 3 to output the authentication result at the shortest time. In a state in which polling is repeatedly performed, it is preferable to set the power supply time for one polling to a certain length by adjusting the parameters of the polling command. This allows continuous power supply.

In step S6, a command to read the IDm data is sent to the non-contact IC card reader 9. The non-contact IC card reader 9 replies to this software whether the reading of the IDm data was successful or unsuccessful.

As described above, the IDm data of the Felica chip 6 can be read by the non-contact IC card reader 9 only when the fingerprint authentication unit 3 authenticates the same fingerprint. If the reading of the IDm data is successful, the data registered in the smartphone 8 in advance is compared with the read IDm data (S7), and if they match, the "Case 1 with fingerprint authentication function for smartphones" is displayed. "Fingerprint authentication was successful" is notified to the system in the smartphone 8 (S8).

On the other hand, in step S7, if the IDm data do not match, it is determined that the non-contact IC card reader 9 has read the IDm data of another Felica card. Then, the system in the smartphone 8 is notified that "fingerprint authentication has failed in the smartphone case 1 with fingerprint authentication function" (S9). If reading the IDm data fails, a command to turn on polling again is sent to the non-contact IC card reader 9, and a loop is created to return to the step of reading the IDm data (S6).

It takes 1 to 2 seconds of calculation time for the fingerprint authentication unit 3 to authenticate a fingerprint. Therefore, it is necessary to keep the coil 5 in a state where it can receive power continuously during the loop period. In order to cope with this, the time for supplying power with one polling command to the non-contact IC card reader 9 is set to be somewhat longer by adjusting command parameters and the like. This allows the coil 5 to always be in a state where it can continuously receive power.

In this loop, if the timer exceeds 10 seconds in step S5, the system in the smartphone 8 is notified that "fingerprint authentication has failed in the smartphone case 1 with fingerprint authentication function" (S9). After notifying the system of the fingerprint authentication result, polling is turned off (S10) and this application software is terminated.

When the system within the smartphone 8 recognizes that "fingerprint authentication was successful with the smartphone case 1 with fingerprint authentication function," it unlocks the smartphone or allows connection to a specific network. That is, according to the fingerprint authentication system shown in FIG. 1, it is possible to realize usability equivalent to that of a built-in fingerprint authentication device.

FIG. 3 is an explanatory diagram of the first embodiment regarding the structure. FIG. 4 is a sectional view thereof. 3 and 4, the same elements as shown in FIG. 1 are given the same reference numerals. Note that reference numeral 10 shown in FIGS. 3 and 4 is the outer shell of the case 1. Reference numeral 11 is a fingerprint authentication function circuit board, and 12 is a through hole. The through hole 12 is provided in the outer shell 10 of the case 1. By exposing the fingerprint sensor 2 mounted on the fingerprint authentication function circuit board 11 through the through hole 12, the fingerprint sensor 2 can be touched with the finger 7.

Referring to FIGS. 3 and 4, the fingerprint authentication function circuit board 11 has a coil 5 formed of a printed pattern of copper foil. In addition to the fingerprint sensor 2, the fingerprint authentication function circuit board 11 is equipped with electronic components such as the fingerprint authentication section 3, memory 4, and Felica chip 6 shown in FIG. The fingerprint authentication function circuit board 11 on which these electronic components are mounted can be easily manufactured to be very thin, with a total thickness of 1 mm or less.

The outer shell 10 of the case 1 needs to match the shape of each model of the smartphone 8, but as shown in the cross-sectional view of FIG. 4, the fingerprint authentication function circuit board 11 is very thin compared to existing smartphone cases. It is only necessary to provide a through hole 12 for attaching the fingerprint sensor and exposing the fingerprint sensor. Therefore, the outer shell 10 of the case 1 can be easily designed and manufactured from existing smartphone case design data.

In addition, when using the smartphone 8 with the case 1 with fingerprint authentication function attached to the smartphone 8 at all times, the shape of the outer shell 10 of the case 1 should be changed so that the fingerprint authentication function circuit board 11 does not move in the surface direction. It is not necessary to fix the fingerprint authentication function circuit board 11 to the outer shell 10 of the case 1, although it is necessary to devise some measures. Since the coil 5 formed by the printed pattern occupies most of the area of the fingerprint authentication function circuit board 11, it can be designed in a shape that can be applied to multiple smartphone models.

Although the operation of the fingerprint authentication system shown in FIG. 1 differs in the source code of the application software depending on the OS of the smartphone, the fingerprint authentication function circuit board 11 itself does not depend on the OS. Therefore, the same fingerprint authentication function circuit board 11 can be used even in smartphones with different OS. Therefore, by designing the fingerprint authentication function circuit board 11 in a shape that can be stored in various smartphone cases, it is possible to mass-produce boards of the same shape and reduce costs.

FIG. 5 is an explanatory diagram of the second embodiment regarding the structure. FIG. 6 is a sectional view thereof. 5 and 6, the fingerprint authentication function circuit board 11 has a coil 5 formed of a printed pattern of copper foil, and in addition to the fingerprint sensor 2, the fingerprint authentication section 3 and the memory 4 shown in FIG. , Felica chip 6, and other electronic components are mounted.

The fingerprint authentication function circuit board 11 on which these electronic components are mounted can be easily manufactured to be extremely thin with a total thickness of 1 mm or less. As shown in FIG. 5, the fingerprint authentication function circuit board 11 is shaped into, for example, the size of a credit card. Thereby, with the smartphone attached to the outer shell 10 of the case 1, the credit card-sized fingerprint authentication function circuit board 11 can be easily attached and detached. The fingerprint authentication function circuit board 11 can operate on systems other than the smartphone's OS. Both sides of the fingerprint authentication function circuit board 11 are fabricated using common non-contact IC card manufacturing technology so that the fingerprint authentication function circuit board 11 alone can be used with a non-contact IC card reader connected to a PC. It may also be used as a contactless IC card with a fingerprint authentication function by laminating it with a thin plastic plate.

The inventor of the present application created application software according to the flowchart shown in FIG. 2, which is compatible with the iPhone of Apple Inc. in the United States, and verified its actual operation. Recent iPhones have built-in contactless IC card readers. For iPhone, application software was created using CoreNFC, which is a communication framework based on the NFC standard, to be compatible with iOS 13 or later OS. Using the iPhone's built-in non-contact IC card reader, we were able to confirm reading and writing of NFC standard cards such as general Felica cards.

When we created an iPhone application software using CoreNFC according to the flowchart shown in Figure 2 and verified its operation, we found that the IDm and UID of NFC standard cards such as general Felica cards and My Fair cards were created. It was confirmed that the data could be read. However, the fingerprint authentication system shown in FIG. 1 has a problem in that it cannot be continuously supplied with power and cannot perform fingerprint authentication or IDm reading.

In the fingerprint authentication system shown in FIG. 1, FIG. 7 shows the power supply state to the coil 5 when starting the iPhone application software based on the flowchart shown in FIG. 2. FIG. 7 is a timing chart of the first example. As a result of examining the above-mentioned problem, that is, the inability to perform continuous power supply, the inventor of the present invention found that the cause was that the period during which power is supplied at one time using a polling command is short in the initial setting. To deal with this problem, even if you try to lengthen the period for one polling by changing the timeSlot value of a parameter such as a CoreNFC Polling command, the actual power supply period does not change. From this, as can be seen from FIG. 7, supplying power to the coil 5 for a short period of time is repeated at regular intervals. Therefore, it has been found that application software alone cannot be used to bring an iPhone into a continuous power supply state so that the fingerprint authentication system shown in FIG. 1 can operate.

When an NFC standard card such as a general Felica card or My Fair card is brought close to the non-contact IC card reader 9 built into the iPhone, that is, when NFC communication is possible, changing the timeSlot value becomes effective and the power supply period also changes. You can make it longer. However, in the fingerprint authentication system shown in FIG. 1, the IC chip (Felica chip 6) becomes capable of NFC communication only after fingerprint authentication is successful. Fingerprint authentication will not be completed unless the power supply time is extended. Therefore, changing the timeSlot value is not effective, and it is not possible to lengthen the power supply period.

In this application software, when the software is running and an NFC standard card such as a general Felica card or My Fair card is brought close to the built-in non-contact IC card reader 9, NFC communication is performed and the timeSlot value is The change becomes effective, and the actual polling period becomes longer, resulting in continuous power supply. By continuously supplying power, the fingerprint authentication system shown in FIG. 1 can perform fingerprint authentication, and it was confirmed that the Felica chip 6 becomes operational after successful fingerprint authentication.

However, if the card that is brought close to the contactless IC card reader 9 in order to change the timeSlot value is a My Fair card, in the fingerprint authentication system shown in FIG. read the UID, which is the unique data of the My Fair Card, and could not read the IDm data of the Felica chip 6. This is because the built-in non-contact IC card reader 9 first performs NFC communication with My Fair Card and then tries to maintain communication with My Fair Card, so communication with Felica chip 6 is not performed. The inventor of the present application thought that.

To solve this problem, in order to enable the built-in non-contact IC card reader 9 to continuously supply power, perform NFC communication after starting power supply to the coil 5 so that the timeSlot value change becomes effective, and also It is necessary to enable the card reader to actually read the IDm of the Felica chip 6 in this state.

Furthermore, in recent years, the non-contact IC card reader 9 of a smartphone needs to not only read cards, but also perform NFC communication with various external devices such as electronic money payments. When the case 1 included in the fingerprint authentication system shown in Figure 1 is attached to the smartphone 8, when the contactless IC card reader 9 performs NFC communication with another IC card using another application software Embodiments of the present invention need to be able to be used without interference when performing NFC communications with various external devices, including contact IC card readers.

In the NFC communication standard, the communication sequence between a contactless IC card reader and an NFC card consists of, first, an "initial response" that sets up a communication path between the contactless IC card reader and the target NFC card; 2. It consists of an "active state" in which information is exchanged according to the application.

First, when power supply from the contactless IC card reader is started in an initial response, the NFC card enters a state of waiting for a communication path setting request (request command) from the contactless IC card reader. Next, a request command is sent from the contactless IC card reader, and the NFC card returns a response. This allows the NFC card present in the communication area of the non-contact IC card reader to be recognized. Thereafter, the contactless IC card reader exchanges parameters with the recognized NFC card and mutually confirms conditions such as communication speed. After this, the initial response transitions to the active state. In the active state, NFC communication is performed by selecting the NFC card recognized in the initial response and repeating responses from the NFC card to commands from the contactless IC card reader.

NFC cards include type A such as My Fair Card, type B such as Japanese driver's license, type F Felica card, etc. How to handle when multiple NFC cards of the same type are present at the same time in the initial response are defined for each type. If multiple NFC type cards exist, by specifying the type of card to be read, only the specified type of card can be recognized. If multiple types are specified, cards of multiple specified types can be recognized. However, there are restrictions that are not specified in the NFC communication standard, such as, for example, when My Fair Card and Felica Card are recognized at the same time, the UID of My Fair Card is read preferentially than IDm of Felica Card.

Type A cards such as My Fair Cards (i) When multiple My Fair Cards are recognized during the initial response, they read the UIDs of all recognized My Fair Cards using a method called the bit collision method, and then: (ii) A contactless IC card reader specifies one of the read UIDs, and (iii) My Fair Cards with matching UIDs respond to select one from multiple My Fair Cards. are doing. Therefore, a My Fair card that does not respond in the initial response cannot be recognized.

(i) For Felica cards, if the IDm is known, specify the IDm and the Felica card with the matching IDm will respond; (ii) If the system codes of multiple Felica cards are different, select the card. Even if they overlap, it is possible to specify the system code and read the IDm data of the corresponding Felica card. In order to change the timeSlot value at the time of initial response, if the Felica card brought close to the non-contact IC card reader 9 is changed to a Felica card that has a different system code than the Felica chip 6 included in the fingerprint authentication system shown in FIG. Even if the Felica card remains as it is after successful authentication, the built-in non-contact IC card reader 9 can read the IDm data of the Felica chip 6 by specifying the system code of the Felica chip 6 on the case 1 side. I was able to confirm. The Felica card that initially responded had a system code different from that of the Felica chip 6, so its IDm was unreadable, but it was confirmed that it was in a continuous power supply state.

In the non-contact IC card reader 9 built into the iPhone, when some NFC card is recognized in the initial response, the timeSlot value change becomes effective. However, after continuous power supply was maintained and fingerprint authentication was successful, fingerprint authentication was successfully performed from the IC chip (Felica chip 6) that has the function of NFC communication on the smartphone case 1 with fingerprint authentication function to the non-contact IC card reader 9. In order to be able to notify you of what has happened, the control timing of the NFC card function that is recognized in the initial response, the type of NFC chip, and the type of IC chip that has the function of NFC communication on the side of case 1 with fingerprint authentication function for smartphones. It is necessary to combine NFC types appropriately.

In the fingerprint authentication system shown in FIG. 1, FIG. 8 shows the power supply state to the coil 5 when starting the iPhone application software based on the flowchart shown in FIG. 2. FIG. 8 is a timing chart of the second example. Referring to FIG. 8, when power is supplied to coil 5 to enable the change in the timeSlot value, Felica chip 6 is made operable for a short time with a slight delay from the start of power supply. As a result, when power is supplied to the coil 5, an initial response of NFC communication is performed between the built-in non-contact IC card reader 9 and the Felica chip 6 within the initial setting short polling period, and the timeSlot value change is valid. Become. Therefore, the actual polling period becomes longer, resulting in a state where continuous power supply is performed.

In the timing chart of the second example in FIG. 8, the Felica chip 6 is put into the operating state a little later than the power supply to the coil 5, but it may be put into the operating state at the same time. The delay time is set when (i) an application software other than this software is started and the NFC card is read by the contactless IC card reader 9, and (ii) the contactless IC card built into the smartphone 8. This is because the order in which the Felica chip 6 is recognized is delayed so that the Felica chip 6 does not interfere when the reader 9 performs NFC communication with an external device for payment of electronic money or the like.

What is important in the timing chart of the second example in FIG. 8 is that the Felica chip 6 is temporarily stopped after the coil power supply is started and the Felica chip 6 is recognized by the initial response. As can be seen from the flowchart shown in FIG. 2, this application software does not read IDm until 0.5 seconds after coil power supply is started. During this period, even if the Felica chip 6 is in an operating state for a short time, the operation of this application software is not affected. With this software, IDm is read 0.5 seconds after coil power feeding is started. Since this is before the time when the fingerprint authentication section 3 issues the authentication result at the earliest, by temporarily stopping the Felica chip 6 before that time, this software can perform fingerprint authentication by reading the IDm of the Felica chip 6. Success can be reliably notified to the system within the smartphone 8.

In the second example timing chart of FIG. 8, the IC chip on the case 1 side that has the function of NFC communication is controlled. Therefore, the IC chip does not have to be a Felica chip. Even with other NFC chips, the recognized NFC chip is temporarily stopped during the initial response, and after the fingerprint authentication is successful, the NFC chip is put into operation again and a notification that the fingerprint authentication has been successful is issued, so that the NFC chip can be operated without problems. However, when operating as shown in the timing chart of the second example in Figure 8, the IC chip on the case 1 side that has the function of NFC communication is operated by the power supply from the external non-contact IC card reader, and fingerprint authentication is performed. Even if it is not successful, communication becomes possible, and as a result, it becomes possible to skim the unique data etc. by easily reading it with an external non-contact IC card reader, which may weaken security.

In the fingerprint authentication system shown in FIG. 1, FIG. 9 shows the power supply state to the coil 5 when starting the iPhone application software based on the flowchart shown in FIG. 2. FIG. 9 is a timing chart of the third example. Referring to FIG. 9, the IDm of the Felica chip 6, which operates when the fingerprint authentication is successful, is recognized in the initial response in order to prevent it from being read by an external non-contact IC card reader when the fingerprint authentication is not successful. Another NFC chip has been added inside case 1. Then, when power is supplied to the coil 5, another NFC chip is made operational for a short time with a slight delay.

If another NFC chip is a Felica chip, there is no chip with the same IDm, so if fingerprint authentication is not successful, the IDm that can be read by an external non-contact IC card reader is different from the IDm of the Felica chip 6. Therefore, security can be maintained. In addition, once a Felica chip is recognized in the initial response, the system code of another Felica chip can be recognized not only when the two Felica chips have different system codes, but also when only one Felica chip is operating at the same time. Even if the code is the same as the system code of the Felica chip 6, NFC communication is possible after transitioning to the active state. Therefore, even if two low-priced FeliCa Lite-S chips are installed in the smartphone case 1 with a fingerprint authentication function, they can operate without problems if controlled so that the two chips do not operate at the same time.

Furthermore, simply by bringing the smartphone 8 close to an external non-contact IC card reader, another IDm can be sent without performing fingerprint authentication, so in applications where security is not strict, it is possible to actively perform fingerprint authentication of another IDm. You can also easily use it without it. In addition, since the FeliCa Lite-S chip has a different system code from the FeliCa Standard chip used for electronic money, the contactless IC card reader 9 built into the smartphone 8 can communicate with external devices and NFC for electronic money payments, etc. There is no interference when communicating.

In the fingerprint authentication system shown in FIG. 1, the power supply state to the coil 5 when starting the iPhone application software based on the flowchart shown in FIG. 2 is shown in FIGS. 10 and 11. 10 and 11 are timing charts of the fourth and fifth examples. In the timing charts of the fourth and fifth examples, in the same way as explained with reference to the timing chart of the third example in FIG. 1, and when power is supplied to the coil 5, another NFC chip is activated with a slight delay. In the fourth example timing chart of FIG. 10, another NFC chip is activated twice, and in the fifth example timing chart of FIG. 11, another NFC chip is activated until fingerprint authentication is successful. There is. This is to delay the timing of stopping another NFC chip with respect to the timing of the third example of FIG. 9 described above.

In the iPhone, continuous power supply is enabled by enabling timeSlot value changes in the initial response, but if communication with the NFC chip stops after transitioning from the initial response to the active state, continuous power supply will be canceled after a certain period of time. . (i) As shown in the timing chart of the fourth example in Figure 10, communication with the NFC chip is stopped and then put into operation again for a short time; (ii) Fingerprint authentication is performed as shown in the timing chart of the fifth example in Figure 11. By maintaining NFC chip communication until the device is successful, the maximum continuous power supply time is extended. In this case, it is possible to configure the NFC chip, which is separate from the IC chip, to be able to change parameters such as delay time from the start of power supply to activation, operation time, repetition period, and number of repetitions according to the smartphone being used. good.

In addition, when maintaining the communication of the NFC chip until the fingerprint authentication is successful as shown in the timing chart of the fifth example in FIG. 11, the iPhone software based on the flowchart shown in FIG. Even if the IDm of an NFC chip is detected, this software stores the IDm of another NFC chip so that it does not end at step S7. When reading the IDm of another NFC chip, send a command to turn on polling again to the contactless IC card reader 9 in the same way as when reading the IDm fails, and return to the IDm data reading step, etc. as appropriate. Application software needs to be modified.

FIG. 12 shows the power supply state when the iPhone application software is started based on the flowchart shown in FIG. 2 in the fingerprint authentication system shown in FIG. 1. FIG. 12 is a timing chart of the sixth example. Similar to the timing chart of the third example in FIG. 9, another NFC chip that is recognized by the initial response is added to the smartphone case 1 with a fingerprint authentication function, and when power is supplied to the coil 5, another NFC chip is activated. This operating state is maintained until the power supply to the coil 5 is stopped.

Referring to FIG. 12, after successful fingerprint authentication, not only the Felica chip 6 but also another NFC chip maintains its operating state at the same time. In selecting the type of another NFC chip, select the type of NFC chip that can read the IDm of the Felica chip 6 that has not made an initial response even if another NFC chip that has made an initial response is operating. There is a need.

As mentioned above, Felica can read multiple Felica chips if one Felica chip responds at the time of initial response. In order to read multiple Felica chips, by specifying IDm or system code, the corresponding Felica chips respond. However, CoreNFC does not have a method for specifying IDm. Therefore, it is necessary to specify the system code and read the corresponding Felica chip. In this case, if you specify multiple system codes, you can read the corresponding Felica chips at the same time.

If there are multiple Felica chips with the same system code, it is not possible to read multiple Felica chips at the same time, so another NFC chip may be a Felica chip that has a different system code than the Felica chip 6. Here, in order to not interfere with communication with the Felica chip with a specific system code for electronic money payments etc. on the iPhone, select a Felica chip with a system code different from those system codes as another NFC chip. It's better to leave it alone.

As shown in the timing chart of the sixth example in FIG. 12, two Felica chips with different system codes are incorporated, and one Felica chip remains in operation during the power supply period to the coil 5 regardless of fingerprint authentication. In this case, there is no need to synchronize the timing with the fingerprint authentication section 3. Therefore, in the fingerprint authentication system shown in FIG. One possible method is to incorporate it directly into the system. Of course, by mounting Felica chips with different system codes on the fingerprint authentication function circuit board 11 on which the fingerprint authentication unit 3 and Felica chip 6 are mounted, the coil 5 may be shared and costs can be reduced. However, the embodiments of the timing charts shown in FIGS. 9, 10, and 11, in which two Felica chips with the same system code can be used, can further reduce costs and the operating time of the Felica chips is shorter. Power consumption also decreases.

As described above, according to the embodiment explained based on the timing charts shown in FIGS. 8, 9, 10, 11, and 12, it is not possible to use only the original application software. Even with smartphones such as iPhones that cannot continuously supply power from the contact IC card reader 9, (i) a fingerprint authentication function is installed in the case 1, and (ii) a non-contact IC built into the smartphone 8 is used. Fingerprint authentication is started upon receiving power from the card reader 9, (iii) continuous power supply is established by recognizing the NFC chip in the initial response, and (iv) when fingerprint authentication is successful, the non-contact IC card reader By receiving the fingerprint authentication notification, the user can notify the smartphone 8 that "the same fingerprint has been authenticated." Therefore, a fingerprint authentication function can be substantially added to the smartphone 8 without a wired connection to the smartphone.

In addition, if the NFC chip recognized in the initial response is a Felica chip, by selecting an appropriate system code, you can (i) start an application software other than this application software and use the non-contact IC card reader 9 (ii) When the non-contact IC card reader 9 built into a smartphone performs NFC communication with an external device for electronic money payment, etc., embodiments of the present invention can prevent interference. You can prevent it from happening.

In Figures 8, 9, 10, 11, and 12, the initial response for a smartphone such as an iPhone, which cannot maintain continuous power supply from the built-in non-contact IC card reader using application software alone. By recognizing the NFC chip, continuous power supply can be realized using application software. Therefore, it is possible to operate not only the smartphone case 1 with a fingerprint authentication function, but also another non-contact IC card that does not operate without continuous power supply. The function of recognizing the NFC chip using this initial response may be realized with an independent circuit board, and this circuit board may be incorporated into the outer shell 10 of the case 1 described with reference to FIG. 5, or may be built into the smartphone 8. By attaching the card near the non-contact IC card reader 9, it is possible to operate a non-contact IC card with a fingerprint authentication function, which cannot be operated without continuous power supply, and use the fingerprint authentication function.

FIG. 13 is a block diagram of a fingerprint authentication system related to the present invention, in which an independent circuit board performs the function of recognizing an NFC chip in an initial response. In FIG. 13, the same elements as shown in FIG. 1 are given the same reference numerals. Reference numeral 13 shown in FIG. 13 is an NFC chip recognized in the initial response. Reference numeral 14 is a second coil different from the coil 5 described above. Reference numeral 15 is an auxiliary circuit board. Reference numeral 16 is a non-contact IC card with a fingerprint authentication function or a fingerprint authentication function circuit board. In order to distinguish it from the second coil 14, the coil with reference numeral 5 will be referred to as a "first coil."

Referring to FIG. 13, in the illustrated fingerprint authentication system, devices mounted on the fingerprint authentication function-equipped non-contact IC card or the fingerprint authentication function circuit board 16, that is, the fingerprint sensor 2, the fingerprint authentication unit 3. The memory 4 for storing verification fingerprint data, the first coil 5, and the IC chip (Felica chip 6) constitute a fingerprint authentication means Fp. This fingerprint authentication means Fp operates in the same way as the fingerprint authentication means Fp in the smartphone case 1 with a fingerprint authentication function shown in FIG. On the other hand, an NFC chip 13 and a second coil 14 are mounted on the auxiliary circuit board 15, and when power is supplied from the card reader 9 to the second coil 14, the second coil 14 that receives the power becomes an NFC chip. Power is supplied to the chip 13, and the NFC chip 13 communicates with the card reader 9 and is recognized by an initial response. At this stage, even if the smartphone 8 is a model such as an iPhone in which it is not possible to continuously supply power from the built-in non-contact IC card reader using application software alone, the power supply from the card reader 9 becomes continuous. When power is continuously supplied to the first coil 5, the first coil 5 receives the power and supplies power to the fingerprint sensor 2, fingerprint authentication unit 3, memory 4, etc. to start fingerprint authentication, and the smartphone 8 allows you to use the fingerprint authentication function.

If the NFC chip 13 mounted on the auxiliary circuit board 15 is a contactless IC card with a fingerprint authentication function or a Felica chip mounted on the fingerprint authentication function circuit board, a Felica chip with a different system code is used. The NFC chip may be configured to operate constantly by power supply from the second coil 14 as shown in the timing chart in FIG. A circuit for controlling the activation timing of the NFC chip 13 may be added to the auxiliary circuit board 15 so that the NFC chip operates.

14 and 15 are cross-sectional views for explaining the relative positions of the smartphone 8 and the second coil 14. 14 and 15, the same elements as shown in FIG. 13 are given the same reference numerals. The inventor of the present application confirmed the operation with a Felica card commercially available as the auxiliary circuit board 15 in the iPhone of Apple Inc. in the United States, as well as a seal and a flexible board module with equivalent functions. As shown in the timing chart of FIG. 12, in these Felica cards, the NFC chip 13 always operates due to power supply from the second coil 14, and there is no major difference other than the size of the coil. If these Felica cards and the like are placed on several iPhones as the auxiliary circuit board 15 so that they fit on the bottom of the iPhone as shown in FIG. 14, the auxiliary circuit board 15 will not operate and the It worked only when the auxiliary circuit board 15 protruded largely from the bottom of the iPhone near where the non-contact IC card reader 9 was built-in.

In the iPhone, the reason why the auxiliary circuit board 15 does not operate unless the auxiliary circuit board 15 is protruding from the bottom of the iPhone as shown in FIG. 15 is that it is generated from the non-contact IC card reader 9 built into the iPhone. The alternating magnetic field mainly comes out from the side of the iPhone, and unless the auxiliary circuit board 15 is arranged so that the magnetic flux of this alternating magnetic field passes through the second coil 14, it will not be enough to operate the NFC chip 13. This is because electricity cannot be supplied. Therefore, if the auxiliary circuit board 15 is a flat plate, it will protrude significantly from the bottom of the iPhone as shown in FIG. 15.

FIG. 16 is a diagram for explaining the arrangement of the second coil 14 with respect to the smartphone 8. In FIG. 16, the same elements as shown in FIG. 13 are given the same reference numerals. In FIG. 16, the auxiliary circuit board 15 is configured such that part or all of the board is made of a flexible printed circuit board or the like so that a part of the auxiliary circuit board 15 is bent to cover part of the bottom and side surfaces of the smartphone 8. has been done. This allows the magnetic flux of the alternating magnetic field generated from the non-contact IC card reader 9 to pass through the second coil 14. Further, the auxiliary circuit board 15 does not protrude significantly from the smartphone 8. When I bent a commercially available Felica card so as not to break the internal wiring and attached it to the iPhone as the auxiliary circuit board 15 as shown in FIG. It was confirmed that the Felica chip (NFC chip 13) in the Felica card (auxiliary circuit board 15) was activated by power supply, the Felica chip was recognized by the non-contact IC card reader 9 in the initial response, and a continuous power supply state was established.

17 and 18 are cross-sectional views for explaining the fingerprint authentication system of FIG. 13. 17 and 18, the same elements as shown in FIG. 13 are given the same reference numerals. Reference numeral 17 shown in FIGS. 17 and 18 is a smartphone case that is attached to the smartphone 8. As shown in FIG. Reference numeral 18 is a non-contact IC card with a fingerprint authentication function, and the shape of the non-contact IC card with a fingerprint authentication function or the fingerprint authentication function circuit board 16 shown in FIG. 13 is shaped into the size of a credit card. Reference numeral 19 is an LED, which is mounted on the non-contact IC card 18 with a fingerprint authentication function and constitutes a display section that displays the power supply status of the non-contact IC card with a fingerprint authentication function, success/failure of fingerprint authentication, etc.

In FIGS. 17 and 18, the auxiliary circuit board 15 is partially bent by using a flexible printed circuit board or the like for part or all of the board, as shown in FIG. This bent portion covers the bottom and part of the sides of the smartphone 8 with the auxiliary circuit board 15. The magnetic flux of the alternating magnetic field generated from the non-contact IC card reader 9 passes through the second coil 14. Thereby, the auxiliary circuit board 15 can be operated by wireless power supply from the non-contact IC card reader 9. The auxiliary circuit board 15 is fixed to the smartphone case 17 with double-sided tape or the like. Although the auxiliary circuit board 15 may be directly fixed to the smartphone 8 with double-sided tape or the like, it is preferable to fix it in such a way that it can be easily attached to and detached from the smartphone 8 in consideration of maintenance such as repair. Furthermore, by separating the auxiliary circuit board 15 from the smartphone 8 by the thickness of the case, the effective area of the second coil 14 through which the alternating magnetic field from the non-contact IC card reader 9 passes can be increased. Thereby, the auxiliary circuit board 15 can receive more stable power supply.

Referring to FIG. 17, a state is shown in which the non-contact IC card 18 with fingerprint authentication function is accessed near the non-contact IC card reader 9 with the auxiliary circuit board 15 attached to the smartphone 8 via the smartphone case 17. FIG. 17 illustrates. When power supply from the non-contact IC card reader 9 is started in this state, the NFC chip 13 in the auxiliary circuit board 15 is activated, the NFC chip 13 is recognized by the non-contact IC card reader 9 in an initial response, and the fingerprint is detected. The non-contact IC card 18 with an authentication function is continuously supplied with power, and fingerprint authentication becomes possible. In FIG. 17, the operation was confirmed by bending Felica cards of different sizes as the auxiliary circuit board 15, a seal having the same function, and a part of a flexible board module. The larger the area of the second coil 14 that covers the bottom of the smartphone 8 is, the more power can be supplied to enable the non-contact IC card 18 with fingerprint authentication function to operate, and as a result, the non-contact IC card reader 9 and the fingerprint authentication function It was confirmed that the range of relative positions with the attached non-contact IC card 18 was expanded. This is because power from the non-contact IC card reader 9 can be supplied over a wider range via the second coil 14.

Referring to FIG. 18, in the illustrated embodiment, a mechanism for holding a card is added to the smartphone case 17. By adding this card holding mechanism to the case 17, the non-contact IC card 18 with a fingerprint authentication function can be stored in the smartphone case 17 when the non-contact IC card 18 with a fingerprint authentication function is not in use. When performing fingerprint authentication, the non-contact IC card 18 with fingerprint authentication function is pulled out from the smartphone case 17 and fingerprint authentication is performed in a state as shown in FIG. In both cases of FIGS. 17 and 18, the fingerprint sensor 2 is located on the screen side of the smartphone 8, so by touching the fingerprint sensor 2 with the finger 7 while visually checking the position of the fingerprint sensor 2 and the fingerprint sensor 2, Fingerprint authentication can be performed reliably. Further, the LED 19 on the non-contact IC card 18 with a fingerprint authentication function makes it possible to perform fingerprint authentication while checking the power supply status and success/failure of fingerprint authentication. The usage as shown in FIG. 18 can also be achieved by attaching a card holder for holding a commercially available credit card size card to the case 17 of FIG. 17.

In FIGS. 17 and 18, by using multiple non-contact IC cards 18 with fingerprint authentication functions, it is possible to perform fingerprint authentication using separate cards for corporate use and personal use, thereby achieving higher security. Become. Further, with one non-contact IC card 18 with a fingerprint authentication function, the fingerprint authentication function can be used not only on the smartphone 8 but also on other terminals, increasing convenience.

According to the fingerprint authentication system illustrated in FIGS. 13, 17, and 18, it is possible to provide usability equivalent to that of a fingerprint authentication device built into a smartphone. In addition, similar to SIM swap attacks, the criminal registers his or her biometric information on a new smartphone to which he has transferred his phone number, thereby disabling the smartphone's built-in facial recognition and fingerprint authentication. Security can also be ensured. In other words, the criminal cannot obtain the non-contact IC card 18 with a fingerprint authentication function in which a fingerprint is registered only by a SIM swap attack. Even if a criminal obtains a new contactless IC card 18 with an unregistered fingerprint authentication function and registers his or her own fingerprint, the unique data will be different, so even if a SIM swap attack occurs, the fingerprint authentication will be considered successful. is not recognized. Even if the culprit were able to obtain the non-contact IC card 18 with the fingerprint authentication function in which the fingerprint was registered, the fingerprint authentication would not be successful with the culprit's fingerprint. As described above, it can be said that the fingerprint authentication system of the present invention is an effective authentication device even against SIM swap attacks. According to the fingerprint authentication system of the present invention, it is possible to provide higher security than a fingerprint authentication device built into a smartphone.

Furthermore, the auxiliary circuit board 15 shown in FIGS. 13, 17, and 18 is for a model such as an iPhone in which it is not possible to continuously supply power from the built-in non-contact IC card reader using application software alone. It is also attached to a smartphone so that continuous power supply can be achieved. In addition, as long as the smartphone is attached, the NFC chip 13 of the auxiliary circuit board 15 can be accessed from the smartphone at any time to check the unique number such as IDm, so it can be used as one type of multi-factor authentication. Authentication using the auxiliary circuit board 15 is not fingerprint authentication, so if the auxiliary circuit board 15 is stolen, it is ineffective against SIM swap attacks. However, if the auxiliary circuit board 15 is not stolen, it becomes an effective authentication device against SIM swap attacks. Since there is no need to touch the fingerprint sensor, authentication using the contactless IC card 18 with a fingerprint authentication function is required for large remittances through online banking, and authentication using the auxiliary circuit board 15 is required for logging in and checking balances through online banking. It is possible to perform smooth operation using .

As mentioned above, the auxiliary circuit board 15 is not equipped with a fingerprint authentication function, so if the auxiliary circuit board 15 is stolen, it is ineffective against SIM swap attacks. However, by configuring the auxiliary circuit board 15 and the fingerprint authentication function circuit board as one circuit board, like the fingerprint authentication function circuit board 11 in FIGS. 3 and 4, even in the case of theft, SIM swap attacks can be avoided. It becomes possible to prevent It should be noted that it is an easy design matter for those skilled in the art to design a circuit board in which one coil serves as both the first coil and the second coil.

1 Case Fp with fingerprint authentication function for smartphone Fingerprint authentication means 2 Fingerprint sensor 3 Fingerprint authentication section 4 Memory 5 Coil 6 IC chip (Felica chip)
8 Smartphone 9 Contactless IC card reader 13 NFC chip 14 Second coil 15 Auxiliary circuit board 16 Contactless IC card with fingerprint authentication function or fingerprint authentication function circuit board 18 Contactless IC card with fingerprint authentication function 19 LED

Claims

It is attached to a smartphone with a built-in non-contact IC card reader, and the smartphone can be operated while attached,
A non-contact IC card reading auxiliary circuit with a fingerprint authentication function that enables a smartphone to use a non-contact IC card with a fingerprint authentication function or a fingerprint authentication function built in a fingerprint authentication function circuit board,
The non-contact IC card with fingerprint authentication function or the fingerprint authentication function circuit board,
a fingerprint sensor,
A fingerprint authentication section,
A memory for storing fingerprint data for verification,
a first coil receiving power from the contactless IC card reader;
A fingerprint authentication means including an IC chip having a function of NFC communication with the non-contact IC card reader,
The fingerprint authentication means is
a fingerprint data reading function that starts reading fingerprint data using the fingerprint sensor when the first coil receives power from the contactless IC card reader;
a fingerprint data matching function for matching the read fingerprint data with the matching fingerprint data stored in the memory by the fingerprint authentication unit;
It has a fingerprint authentication notification function that performs the NFC communication from the IC chip to the non-contact IC card reader only when the same fingerprint is authenticated by the fingerprint authentication unit, and notifies that the fingerprint has been authenticated as the same fingerprint. Built-in fingerprint authentication function,
The fingerprint sensor, the fingerprint authentication unit, the memory, and the IC chip operate only with the power received by the first coil,
The smartphone is a model that cannot continuously supply power from the contactless IC card reader to the first coil with only the application software installed on the smartphone,
The non-contact IC card reading auxiliary circuit with fingerprint authentication function includes:
an NFC chip different from the IC chip;
comprising a second coil different from the first coil,
When the second coil receives power from the contactless IC card reader, the second coil recognizes the other NFC chip in the initial response of the NFC communication, thereby causing the contactless IC card reader to receive power from the first coil. Continuously supplies power to the coil,
completing the fingerprint authentication by the fingerprint authentication unit;
A non-contact IC card reading auxiliary circuit with a fingerprint authentication function for a smartphone, characterized in that when the fingerprint authentication is successful, the fingerprint authentication notification is sent.
The fingerprint authentication notification, which notifies that the fingerprint authentication was successful when the same fingerprint is authenticated by the fingerprint authentication unit, transfers data using unique data stored in the IC chip to the non-contact IC card. The non-contact IC card reading auxiliary circuit with a fingerprint authentication function for a smartphone according to claim 1, wherein the non-contact IC card reading auxiliary circuit with a fingerprint authentication function is transmitted to a reader by the NFC communication.
When the smartphone compares data using the unique data transmitted from the IC chip to the contactless IC card reader by the NFC communication and data registered in the smartphone in advance, and the data match, 3. The non-contact IC card reading auxiliary circuit with a fingerprint authentication function for a smartphone according to claim 2, wherein the smartphone recognizes that the fingerprint is authenticated by the fingerprint authentication unit.
The non-contact IC card reading auxiliary circuit with a fingerprint authentication function for a smartphone according to claim 1, wherein the fingerprint authentication function is mounted on the same substrate as the non-contact IC card reading auxiliary circuit with a fingerprint authentication function.
5. The non-contact IC card reading auxiliary circuit with a fingerprint authentication function for a smartphone according to claim 4, wherein the non-contact IC card reading auxiliary circuit with a fingerprint authentication function is attached to the smartphone via a smartphone case. .
The non-contact IC card reading auxiliary circuit with a fingerprint authentication function for a smartphone according to claim 1, wherein the non-contact IC card reading auxiliary circuit with a fingerprint authentication function is attached to the smartphone via a smartphone case. .
A portion of the second coil covers a portion of the side surface of the smartphone so that the magnetic flux of the alternating magnetic field generated from the non-contact IC card reader passes through the second coil. The non-contact smartphone with fingerprint authentication function according to any one of claims 1 to 6, wherein the contactless smartphone with fingerprint authentication function according to any one of claims 1 to 6 is capable of supplying power necessary for recognizing the other NFC chip in an initial response of communication. IC card reading auxiliary circuit.
The non-contact IC card reading auxiliary circuit with a fingerprint authentication function for a smartphone according to claim 7, wherein the IC chip and the other NFC chip are Felica chips.