KR100608775B1 - System and method for authenticating user with handwriting - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system and a method for authenticating a user using a handwriting. It relates to a user authentication system and method using the handwriting to respond to the handwriting using.

A user authentication system using handwriting according to an embodiment of the present invention includes a handwriting information receiving unit that receives a handwritten signature or personal information, and a handwriting of the handwriting of the received signature or personal information and a handwritten signature or personal information. Comparing unit for comparing the degree and a display unit for outputting the screen according to the comparison result.

Handwriting, Signature, Privacy, Threshold

Description

System and method for authenticating user with handwriting {System and method for authenticating user with handwriting}

1 is a graph illustrating a malfunction according to a recognition rate of a signature recognition algorithm using a conventional pen.

2 is a block diagram showing a user authentication system using a handwriting according to an embodiment of the present invention.

3 is a view showing a signature and personal information input screen according to an embodiment of the present invention.

4 is a flowchart illustrating a user authentication process using a handwriting according to an embodiment of the present invention.

5 is a graph illustrating whether a personal information input screen is output based on a threshold according to an embodiment of the present invention.

<Explanation of symbols on main parts of the drawings>

210: information storage unit 220: handwriting information receiving unit

230: comparison unit 240: display unit

The present invention relates to a user authentication system and method using a handwriting, and more particularly, in order to determine whether a user who wants to use a portable device, such as a PDA or a tablet PC, has a user right, asking the user for preset personal information. The present invention relates to a user authentication system and a method using a handwriting for answering a question in a handwriting using a pen.

As the popularity of portable devices such as PDAs (Personal Digital Assistants) or tablet PCs increases, there is a demand for a system for determining whether a user who intends to use the device has a usage right.

In the case of a conventional personal computer (PC), a user account and password are used to grant a user permission to use a PC or change an environment of an operating system. However, in the case of a portable device such as a PDA or a tablet PC, it is convenient for the user to use the pen on the electronic sensitive pad rather than the keyboard, so that the user's authority is determined through the input using the pen.

Of course, when using biometric devices such as a fingerprint reader, an iris recognition device, and an arterial recognition device, the use authority can be easily determined. Can be.

In this case, a signature recognition algorithm is used as a method for determining the use authority using a pen in a portable device. The signature recognition algorithm compares the signature handwriting of a user who wants to use the portable device with a preset signature handwriting. This is to determine whether or not to use.

The signature recognition algorithm using the handwriting is a simple method for determining the use authority in a portable device using a pen as a main input tool, but there is a possibility of malfunction depending on the recognition rate.

1 is a graph illustrating a malfunction according to a recognition rate of a signature recognition algorithm using a conventional pen.

The signature recognition algorithm using a pen compares the handwriting of a signature input by a user who intends to use a portable device with a handwriting of a preset signature and determines the use authority according to the similarity.

In general, since the handwriting typed by the user cannot always be the same, a security level setting method for setting the application threshold for determining the similarity of the handwriting in advance and granting permission if there is a similarity within the threshold is used. do.

However, if you set the security level too low, you may give the permission to someone who practiced the handwriting of the registered user. If you set the security level too high, the handwriting of the registered user may not be recognized. Can be.

FIG. 1 illustrates a correlation between a rate of granting a permission to use a person and a rate of granting a registered user to a registered user. A conventional method provides both convenience and security. It can be seen that it cannot be satisfied.

An object of the present invention is to determine whether to authenticate a user by comparing a handwriting of information input by a user using a pen with a handwriting of previously stored information.

It is also an object of the present invention to prevent others from accessing by repetitive practice by displaying a randomly selected question of a plurality of stored personal information questions on the screen and receiving a response thereto.

The objects of the present invention are not limited to the above-mentioned objects, and other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, a user authentication system using a handwriting according to an embodiment of the present invention includes a handwritten information receiving unit for receiving a handwritten signature or personal information, a handwritten signature of the received signature or personal information, and a previously stored signature or Comparing unit for comparing the degree of similarity of the handwriting to the personal information and a display unit for outputting the screen according to the comparison result.

A user authentication method using handwriting according to an embodiment of the present invention comprises the steps of receiving a handwritten signature or personal information, and the degree of similarity between the handwriting of the received signature or personal information and the handwriting of the previously stored signature or personal information. Comparing and outputting a screen according to the comparison result.

Specific details of other embodiments are included in the detailed description and the drawings.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, and only the embodiments make the disclosure of the present invention complete, and those of ordinary skill in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram showing a user authentication system using a handwriting according to an embodiment of the present invention.

The user authentication system using the handwriting includes an information storage unit 210, a handwriting information receiver 220, a comparison unit 230, and a display unit 240.

Handwriting information receiving unit 220 serves to receive the signature or personal information written by the user.

Portable devices such as PDAs and tablet PCs, which are not easy to use with a keyboard, have electronic sensitive pads. Information inputted by a user using a pen to press the surface of the electronic sensitive pad is converted into text. This makes it easy for users to create and manage documents.

Therefore, in the present invention, as the handwriting information receiver 220, it is preferable to use an electronic sensitive pad capable of receiving contents input by a user using a tool such as a pen.

The information storage unit 210 stores a user's signature and personal information received from the handwriting information receiver 220.

The user enters and saves his signature and personal information.The signature and personal information that is saved is not converted into text but the input signature and personal information is converted into a video and saved, or the converted video is handwritten again. It is preferable that the code is converted into and stored in the code containing the characteristics of the. By doing so, the signature entered at the time of user authentication is compared with a code containing the image or handwriting characteristics of the personal information.

Here, the personal information consists of a user's answer to a plurality of questions about his or her personal image. The plurality of questions may be questions set at the time of manufacture of the portable device or questions written by the user.

The information storage unit 210 is preferably a non-volatile memory EEPROM (Electrically Erasable Programmable Read-Only Memory) and Flash ROM, as well as a hard disk drive easily accessible by an operating system.

The comparator 230 may include a signature or personal information written by a user who requests permission to use the portable device through the handwriting information receiver 220 in the information storage 210. Compare with

As a comparison method by the comparator 230, various algorithms such as statistical pattern recognition, Hidden Markov Model (HMM), Fuzzy, Genetic Algorithm, and Discrete Wavelet Transform (DWT) may be used. Therefore, the signature and personal information stored in the information storage unit 210 is preferably stored in the form according to the comparison algorithm performed by the comparison unit 230.

The display unit 240 outputs a signature or personal information input screen and a comparison result screen by the comparison unit 230.

In general, the LCD panel, which is a display unit 240 of a PDA or tablet PC, is a form in which an electronic sensitive device, which is a handwriting information receiver 220 that receives a user input using a pen, is combined. Therefore, the LCD panel, which is the display unit 240 of the user authentication system according to an embodiment of the present invention, may be configured in combination with the electronic sensitive device, which is the handwriting information receiver 220, or may be separated.

When power is applied to the portable device, the display unit 240 first outputs a message requesting a user's signature on the screen. On the other hand, if the handwriting of the signature inputted by the user through the handwriting information receiving unit 220 is similar to the handwriting of the stored signature, a question about personal information is output; otherwise, an input error message is output.

As for the question about personal information, it is preferable that any one of a plurality of questions about stored personal information is selected and output.

And the handwriting of the answer (personal information) written by the user with respect to the question of personal information is also compared with the handwriting of personal information stored in the information storage unit 210, if it is determined by the comparator 230 to use the portable device You are granted permission to move to the operating system usage phase, or an input error message is displayed.

In this case, the input error message is preferably provided with a system shutdown and re-entry button. If the system shutdown button is selected, the system is terminated. If the re-entry button is selected, the signature or personal information input request screen is output again.

3 is a view showing a signature and personal information input screen according to an embodiment of the present invention.

The portable device stores the converted data of the signature and personal information input from the user in the information storage unit 210. FIG. 3 shows a screen output through the display unit 240 to receive the signature and personal information from the user. Indicates.

The environment in which the user enters signature or personal information to obtain the right to use the portable device is not constant, and therefore, it is difficult for the user to always enter the information in the same handwriting. In addition, in the case of personal information, various answers may be presented due to a user's error about the same question.

Accordingly, in the present invention, one signature and each personal information may be stored one by one, or may be stored in plural numbers for one item.

For example, a user may enter a signature in an environment such as when stopping, walking, or boarding a subway, and a plurality of questions including blue, blue, and red may also be used for a question asking a favorite color. You can also enter your personal information at the same time.

Accordingly, the comparator 230 compares the input information of the user who intends to obtain the use authority of the portable device with the information of each item stored in plural, so that the comparison search can be performed with high efficiency. That is, the signature or personal information input through the handwriting information receiving unit 220 is compared with the most similar of the pre-stored signature or personal information, so that the comparison search according to the user's input environment can be performed.

In addition, it is preferable to allow a question set by a user to store a question about personal information, thereby making it possible to more effectively block access by others who know the type of personal information question.

4 is a flowchart illustrating a user authentication process using a handwriting according to an embodiment of the present invention.

When power is applied to the portable device, the signature input screen is output through the display unit 240.

The signature input screen may be output by the application of the operating system, or may be output by the BIOS before the operating system operates. Therefore, when outputted by the BIOS, it is preferable to include a comparator 230 in the BIOS.

On the output signature input screen, a signature input by a user using a pen is received through the handwriting information receiving unit 220 (S410). As described above, the display unit 240 and the handwriting information receiver 220 may be configured as one module or may be configured as different modules.

The comparison unit 230 compares the handwriting of the received signature with the handwriting of the signature stored in the plurality of information storage units 210 (S420), and if the highest degree of similarity is higher than or equal to the threshold, the display unit ( In step S430, the controller 240 outputs a personal information input screen, otherwise, an input error message is output.

At this time, if no signature is stored, the signature input process may be omitted.

The signature input error message screen preferably includes a button for shutting down the system and a re-entry button (S440). When the user selects the shutdown button, the portable device shuts down the system and the power is cut off. If selected, the signature input screen is output again through the display unit 240.

If the handwriting inspection result of the signature by the comparing unit 230 is greater than or equal to the threshold value, the personal information input screen is output through the display unit 240. The personal information input screen is composed of questions about personal information.

As for the question about the personal information, any one of a plurality of questions about the personal information stored in the information storage unit 210 is selected and output.

When the user receives a response to the question asking for the personal information output (S450), the comparison unit 230 may include a handwriting of the plurality of personal information stored in the information storage unit 210. Compare (S460). Thus, if the highest degree of similarity among the comparison results is greater than or equal to the threshold value, the user is given the authority to use the operating system (S490). Otherwise, an input error message screen is output (S470).

At this time, a question about an item having no stored personal information is not displayed on the screen, and when there is no personal information for all items, the personal information input process may be omitted.

The personal information input error message screen preferably includes a button for shutting down the system and a re-entry button (S480). When the user selects the shutdown button, the portable device is shut down and the power is cut off. If is selected, the personal information input screen is output again through the display unit 240.

For reference, whether to output the personal information input screen may be determined according to a signature or a result of comparing personal information.

For example, if the degree of similarity between signatures is above a certain threshold, the personal information input process may be skipped. If the degree of similarity between personal information is between a certain threshold, the personal information input error message screen may be skipped and any personal information input screen may be output again. Will be.

5 is a graph illustrating whether a personal information input screen is output based on a threshold according to an embodiment of the present invention.

The graph of each situation according to the threshold is explained in each step as follows.

(1) If the signature handwriting has a similarity level of A or more, omit the personal information input, and give the user permission to use the operating system.

(2) If the degree of signature handwriting is between A and B, the personal information input screen is displayed and personal information is input from the user.

(3) If the similarity of signature handwriting is less than or equal to B, an input error message is output.

(4) If the personality handwriting has a similarity of C or higher, give the user permission to use the operating system.

(5) If the similarity of the personal information handwriting is between C and D, the personal information input screen is reprinted and personal information is input again from the user.

(6) An input error message is output if the degree of similarity of the personal information handwriting is equal to or less than D.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

According to the user authentication system and method using the handwriting of the present invention as described above has one or more of the following effects.

First, there is an advantage of determining whether the user is authenticated by comparing a handwriting of information input by hand by a user using a pen with a handwriting of previously stored information.

Second, there is an advantage of preventing others from accessing by repetitive practice by displaying a question randomly selected from among a plurality of stored personal information questions on the screen and receiving a response.

Claims (5)

A handwriting information receiver which receives a handwritten signature or personal information; Comparing a first degree of similarity between the handwriting of the received signature and at least one handwriting of a plurality of pre-stored signatures, and corresponding to a handwriting of at least one stored personal information corresponding to a randomly selected question among a plurality of questions according to the comparison result; A comparison unit comparing a second degree of similarity between the writings of the received personal information in response to the selected question; And And a display unit for outputting a screen according to a comparison result of the first similarity degree or the second similarity degree. delete The method of claim 1, The screen according to the comparison result is A user authentication completion screen output when the first similarity exceeds a first threshold or the second similarity exceeds a second threshold; A personal information input screen output when the first degree of similarity is included in a first threshold range; A signature re-input screen that is output when the first similarity is included in a second threshold range; A personal information re-entry screen output when the second similarity is included in a third threshold range; And And at least one of an input error message screen output when the first similarity is less than the third threshold or the second similarity is less than the fourth threshold. Receiving handwritten signature or personal information; Comparing a first similarity degree between the handwriting of the received signature and at least one handwriting of a plurality of previously stored signatures; Comparing a second similarity degree between a handwriting of at least one stored personal information corresponding to a randomly selected question among a plurality of questions and a handwriting of the received personal information in response to the selected question according to the comparison result; And And outputting a screen according to a comparison result of the first similarity degree or the second similarity degree. The method of claim 4, wherein The screen according to the comparison result is A user authentication completion screen output when the first similarity exceeds a first threshold or the second similarity exceeds a second threshold; A personal information input screen output when the first degree of similarity is included in a first threshold range; A signature re-input screen that is output when the first similarity is included in a second threshold range; A personal information re-entry screen output when the second similarity is included in a third threshold range; And And at least one of an input error message screen output when the first similarity is less than the third threshold or the second similarity is less than the fourth threshold.

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