KR20130014676A - User authentication method using biometric one-time password - Google Patents

Abstract

PURPOSE: A temporary password based user authentication method using biometric information is provided to improve the protectiveness of personal information through an OTP method. CONSTITUTION: A user terminal(100) sends biometric information captured by a camera module on a smart phone to a server(200). The server generates arbitrary random number biometric ID value. Bio information uses the face of a user in order to intensify user authentication. A UAC and proxy server temporarily keep bio information. By using image pixel information corresponding to coordinate of conduction value delivered from the proxy server, B-OTP information is generated.

Description

One-time password-based user authentication using biometric information {USER AUTHENTICATION METHOD USING BIOMETRIC ONE-TIME PASSWORD}

The present invention relates to a one-time password-based user authentication method using biometric information, and more particularly, each user generates a one-time password from the random image information captured by the user through his or her own smartphone, thereby authenticating the user. It relates to a one-time password-based user authentication method using biometric information performing the process.

OTP  Technical analysis

One-time password (OTP) technology is a technology for generating a one-time password. OTP generation technology can be largely divided into asynchronous and synchronous.

1 is a conceptual diagram illustrating an asynchronous OTP scheme. The asynchronous OTP scheme operates as a challenge response scheme, as shown in FIG. 1, and performs an authentication process based on a response to a query value. This method does not require synchronization of the server 20 and the user terminal 10, but requires user input and may cause network overload.

2 is a conceptual diagram illustrating a synchronization OTP scheme, which operates in a time synchronization scheme, an event synchronization scheme, and an event-time synchronization scheme, and performs an accurate synchronization process between the user terminal 10 OTP token and the authentication server 20. This is necessary and vulnerable to man-in-the-middle (MITM) attack by generating a password at a specific time interval based on the synchronized time information between the server and the OTP terminal, and there is a problem that there is a limitation of reuse time.

3 is a conceptual diagram for explaining an OTP-based operation scenario.

Referring to FIG. 3, an OTP based operation scenario is as follows. OTP user uses OTP value generation and input into user's PC to verify it in authentication server. The user creates an OTP using his private key information and synchronization information and inputs it to his user PC. The input information is transmitted to the OTP authentication server of the financial institution to perform the process of comparing / verifying the OTP value generated in the server.

Analysis of Existing Image-Based User Authentication Structure

Recently ConfidentTech has proposed Image Authentication. After setting the image title to be used by the user in advance, input the ID and send the title value corresponding to the image corresponding to the image title selected by the user as the response value for the challenge value composed of various combinations of image values. This is a method of performing authentication. For example, if a user selects three categories of dog, car, and ship, a 3-digit access code value consisting of a combination of 5, X, and V values for the Challenge image information as shown in FIG. 3 is transmitted as a response. In the next step, the image and array are swapped so that one of the new combinations of access code values F, z, and N is entered.

This method is similar to the OTP method. The image title information set by the user can be a secret for each user, and it can be said to be a kind of OTP method because different types of images are assigned to different arrays and access codes each time. However, if nine image samples are provided after the user selects three image titles, the probability is 1.19% because only six of the 504 combination codes (9 * 8 * 7) correspond to legitimate access codes. In this method, there is a problem in that three image categories can be easily found by analyzing similarity and commonality of nine images provided by an attacker attempting to connect several times. However, in that the one-time access code is generated using the image information, it can be confirmed that the existing OTP method can be linked to the image or other multimedia information.

An object of the present invention is to provide a one-time password-based user authentication method using biometric information that each user generates a one-time password from the random image information captured by the user himself through his smartphone or the like and performs the user authentication process through the user. Is in.

Another object of the present invention is to enhance security in Internet banking and Internet telephony services using a smartphone, and to improve user authentication based on messages transmitted and received between a smartphone and a proxy server to improve authentication vulnerabilities. It provides a one-time password-based user authentication method using biometric information combining ID information and OTP technology used in internet banking.

According to a preferred embodiment of the present invention for achieving the above object, the one-time password-based user authentication method using the biometric information transmits the captured biometric information using the camera module to the server, the server any Generating a random number biometric ID value; A second step of determining whether the generated biometric ID is a valid ID through a privacy DB of the server, and transmitting the valid biometric ID to the user terminal; A third step of inputting personal information including an ID and a password (PW) by the user terminal, of which only ID information is transmitted to the server; If the received ID information is a valid ID, the server generates a random challenge value and transmits it to the user terminal; And the user terminal generates a B-OTP from its biometric information, the challenge value received from the server, and its own PW information, and transmits the B-OTP to the server again. And generating a OTP and performing user authentication in comparison with the B-OTP received from the user terminal.

According to the one-time password-based user authentication method using biometric information according to the present invention, since it is combined with the OTP method using pseudo biometric information, it is possible to increase the security and improve the identity verification function than the conventional method. have.

In addition, by converting the pseudo biometric image to the pseudo biometric image for the actual owner authentication of the OTP token, it can be applied to the OTP generation process to solve the privacy problem when using bio information, and can also be used for OTP information-based multiple authentication. Has the advantage.

In addition, since the conversion function f is applied to the pseudo biometric information and used in the OTP generation process, the authentication process can be performed based on the one-time password while providing privacy protection for the user acquired biometric information. It has the effect of preventing attacks. Since the time information T is used in the application of the conversion function f, even if a retransmission attack is performed by the attacker, it is effective to detect the retransmission attack. If the attacker's OTP is generated by using the ID, PW information, and time information included in the conversion function f, since it is different from the information generated by the server, it is possible to detect the one-time password modification caused by the retransmission attack.

1 is a conceptual diagram illustrating a process of generating a one-time password of the asynchronous method according to the prior art.
Figure 2 is a conceptual diagram illustrating a process of generating a one-time password of the synchronous conference method according to the prior art.
3 is a conceptual diagram for explaining an OTP-based operation scenario.
4 is a view for explaining a conventional image authentication method.
5 is a conceptual diagram illustrating the overall information generation and procedure of a one time password-based user authentication system using biometric information according to the present invention.
6 is a view showing a detailed structure of a one-time password-based user authentication system using biometric information according to the present invention.
7 is a diagram illustrating a process of generating biometric-one-time password information in a one-time password-based user authentication system using biometric information according to the present invention.
8 is a diagram illustrating an authentication process in a one-time password-based user authentication system using biometric information according to the present invention.
9 is a view showing in detail the detailed structure and authentication flow of a one-time password-based user authentication system using biometric information according to the present invention.
10 is a diagram illustrating an example of an implementation method of a one time password based user authentication system using biometric information according to the present invention.

Hereinafter, a one-time password-based user authentication method and system using biometric information according to the present invention will be described in detail with reference to the accompanying drawings.

5 is a conceptual diagram illustrating the overall information generation and procedures of a one time password-based user authentication method and system using biometric information according to the present invention.

B ( Biometric ) - OTP ( One - Time Password ) User based structure

The overall information generation and procedure for B-OTP authentication is shown in FIG. The user terminal 100 transmits its biometric information to the server 200. The server 200 generates a random challenge value and transmits it to the user terminal 100, and generates a B-OTP using its biometric information, the challenge value received from the server 200, and a symmetric key. The generated B-OTP is transmitted to the server 200 again, and the server 200 generates the B-OTP in the same manner as the B-OTP generation process in the user terminal 100. Therefore, the B-OTP received from the user terminal 100 and the B-OTP generated by the server 200 are compared to perform user authentication.

6 is a diagram illustrating a detailed structure of a one time password based user authentication system using biometric information.

B- OTP  -Based user authentication details structure

The detailed structure for B-OTP based user authentication is shown in FIG. First, in step 1, the user terminal 100 sends the captured biometric information to the server 200 by using the camera module in the smart phone, the server 200 generates a random random biometric ID value . Bioinformation uses its own face to enhance user authentication. Thereafter, since the B-OTP value is extracted from the bio information, the UAC and the proxy server 200 temporarily store the bio information. In this case, the biometric information of the user is a method of generating B-OTP information using image pixel information corresponding to a coordinate value corresponding to a challenge value received from the proxy server 200 in an image obtained from each user. Thereafter, in step 2, it is determined whether the generated biometric ID is a valid ID through the privacy DB of the server 200. The valid biometric ID is sent to the user terminal 100. In step 3, the user terminal 100 inputs his or her personal information, and only ID information is transmitted to the server 200. In step 4, if the received ID information is a valid ID, the server 200 generates a random challenge value and transmits it to the user terminal 100. In step 5, the user terminal 100 generates a B-OTP from its biometric information, the challenge value received from the server 200, and its PW information, and transmits it to the server 200 again. The server 200 generates a B-OTP similarly to the B-OTP process in the user terminal 100, and performs user authentication in comparison with the B-OTP received from the user terminal 100.

7 is a diagram illustrating a process of generating biometric-one-time password information in a one-time password-based user authentication system using biometric information according to the present invention.

B- OTP  Based image extraction structure

Random functions are computed through cryptographically secure hash functions and mod operations on large prime numbers p. The user terminal 100 generates a B-OTP for the image obtained from the camera module of the user terminal 100 using the challenge value received from the proxy server 200. By using the information of the OTP key value to extract the pixel value for a specific position in the image and using this information to generate the B-OTP information as shown in FIG.

8 is a diagram illustrating an authentication process in a user authentication system using bioinformation according to the present invention.

Biometric Information Base OTP  Generation method

OTP information can be generated using biometric information and used for the authentication process. The overall operation is as shown in Figure 8 below.

Step 1: The user captures his face image using his smartphone, that is, a camera module in the user terminal 100, generates Biometric Image information Bi, and transmits it to the server along with time information Tu. S22).

를 생성한 후에 서버의 시간정보 Ts와 함께 {BIDu, Ts} 값을 클라이언트, 즉 사용자단말(100)에 전송한다(S24).Step 2: The server 200 compares its time information Ts with the Tu value received from the client and accepts it if it belongs to a certain error range ΔT and uses the random number Rs value randomly generated by the server 200. ID value for information-based user u

After generating the SB, the {BIDu, Ts} value is transmitted to the client, that is, the user terminal 100 together with the time information Ts of the server (S24).

Step 3: If the client 100 belongs to Tu-Ts <ΔT with respect to the value received from the server 200, the client 100 generates the TIDu, XIDu and Cu values as shown in Equation 1 (S26).

[Equation 1]

At this time, the TIDu value is generated using the BIDu value and the time information Tu value including the user ID information IDu and the biometric image information Bi captured through the camera module, and the XIDu value is the password information for the user IDu. It is created using PID and BIDu value from server. Using these two pieces of information, the client 100 generates Cu = H (XIDu | TIDu | Ts). It can be seen that the BIDu value becomes one-time Biometric ID information generated using the random number Rs generated by the server 200. The client 100 transmits the generated TIDu value and Cu value to the server 200.

값을 생성하여 자신의 DB에 저장된 IDu 정보에 대해서 IDu == IDu* 인지를 확인하게 된다. 만일 동일한 값을 얻게 되면 클라이언트 ID 정보에 대한 유효성을 확인하게 된다(S28). Step 4: Now, the server 200 first uses the TIDu and Cu values received from the client 100 as follows.

It creates a value and checks whether IDu == IDu * for the IDu information stored in its DB. If the same value is obtained, the validity of the client ID information is checked (S28).

Then, the server 200 generates XIDu * and Cu * values using the TIDu and Cu values transmitted to the client 100 to perform the authentication process for the client. The XIDu * value may be generated and verified as shown in Equation 2 below using the PWu * value stored in the DB of the server 200 by itself.

&Quot; (2) &quot;

Now, by comparing the Cu value received from the client 100 and the Cu * value generated in the server 200, if the same value is generated, the server 200 uses the TIDu * value, which is the user's disposable biometric ID information, to challenge. Create a value CH = (TIDu * | Rs | rand (Seq)) and send it to the client 100.

Step 5: The client 100 generates an OTPu value as shown in Equation 3 using the CH value received from the server 200 and transmits it to the server again (S30).

&Quot; (3) &quot;

OTPu = H (XIDU | CH | BIDu)

Step 6: The server 200 generates an OTPu * value for the OTPu received from the client 100 and completes the authentication process for the user when the same value is generated. In the process of performing such a process, the password information PWu of the user IDu can safely perform the authentication process for the user without being leaked to the outside during the network transmission process.

9 is a view showing in detail the detailed structure and authentication flow of a one-time password-based user authentication system using biometric information according to the present invention. A description with reference to FIG. 9 is as follows.

9, a one-time password-based user authentication system using the face biometric ID information according to the present invention includes a biometric information generation unit for generating biometric information; A time information generator for generating time information; ID verification unit for confirming the biometric ID information; A hash function generator for generating a hash function; A biometric one time password generation unit configured to generate and transmit a biometric one time password; ID check unit for checking the biometric ID transmitted from the user terminal; A challenge value generator configured to generate a challenge value through biometric ID information transmitted from the user terminal; A conduction value transmitter for transmitting the conduction value generated by the conduction value generator to a user terminal; A hash function generator for generating a hash function; A biometric one time password generation unit for generating a biometric one time password; A biometric one time password value comparison unit comparing the biometric one time password value transmitted from the user terminal; And a privacy database for storing and managing information for verifying biometric ID information of the user terminal.

Multi-authentication ( Multi - factor authentication ) Function provided

The technique proposed in this method is more secure than the conventional method because it combines with the OTP method using pseudo biometric information. The existing OTP method provides no verification of the actual owner of the OTP token. Although the password is generated using the secret key information when issuing the OTP token, it does not include the information about the actual user and thus a method for verifying it when used by a third party is not provided. However, the use of pseudo-biometric information can improve identity verification.

Provide smartphone-based owner authentication / verification

In case of loss or theft of OTP tokens, both asynchronous and synchronous methods cannot provide countermeasures. If the OTP token is lost, no verification of the original owner is provided. As a result, the OTP method proposed to date is merely for generating a one-time password, and the owner authentication / verification process for the OTP device and module is not provided. Therefore, in the present invention, the transform function is applied to the pseudo biometric image for the OTP token actual owner authentication, and this is applied to the OTP generation process. By using this method, it is possible to solve the privacy problem that occurs when using bio-information, and has the advantage that it can be used for multi-authentication based on OTP information.

 Provides replay attack protection

Since the conversion function f is applied to the pseudo-biometric information in the OTP generation process, the authentication process can be performed based on the one-time password while providing privacy protection for the user-acquired biometric information. You can prevent it. Since the time information T is used in the application of the conversion function f, even if a retransmission attack is performed by the attacker, it can be detected. If the attacker OTP is generated using the ID, PW information, and time information included in the conversion function f, it is possible to detect the one-time password modification caused by the retransmission attack because it is different from the information generated by the server.

10 is a diagram illustrating an example of an implementation method of a one time password based user authentication system using biometric information according to the present invention. A description with reference to FIG. 10 is as follows.

System implementation results and how they work

In the present invention, the Android OS was used as the client system and the SQL server was used as the server system. Android based development environment consists of JAVA JDK 1.6.x version, Android SDK (Software Development Kit), Eclipse galileo-SR2, and SQL server is based on MySQL.

The user in the Android environment performs the process of issuing an account through the server in advance. In the present invention, Biometric OTP login is implemented in the Android environment, and the client-centric B-OTP login process is as follows. When the Android emulator is running, the application is executed. Since the user has already been issued an account, the user can log in and access the server. The user enters his / her ID / PW-based personal privacy information into the input window, and when the login button is pressed, his ID information and current time are transmitted to the server. The server checks the ID information in the table of the Privacy database. When the server confirms that the ID is valid, the server sends a random challenge value to the client. The client who receives the challenge value is converted to a camera UI that can check his / her biometric information, and obtains his pseudo biometric information by pressing the shutter button. The obtained biometric information is sent back to the server, which sends an OK message to the client in response. The client receiving the OK message generates the biometric information and the hash value in a form that cannot be inversely transformed by using the biometric information of the conversion function f, and finally generates the B-OTP value. The generated B-OTP value is transmitted to the server, and the server may generate the B-OTP in the same process as the client. Therefore, Biometric OTP login success / failure can be confirmed by comparing the B-OTP value generated by the client and the B-OTP value generated by the server.

100: user terminal
200: Server

Claims (6)

Transmitting biometric information captured using a camera module to a server, the server generating a random random biometric ID value;
A second step of determining whether the generated biometric ID is a valid ID through a privacy DB of the server, and transmitting the valid biometric ID to the user terminal;
A third step in which a user including an ID and a password PW are inputted by the user terminal, and only ID information is transmitted to the server;
If the received ID information is a valid ID, the server generates a random challenge value and transmits it to the user terminal; And
The user terminal generates a B-OTP from its biometric information, the challenge value received from the server, and its PW information, and sends it back to the server, and the server also performs the B-OTP in the same manner as the B-OTP process in the user terminal. And generating a fifth step of performing a user authentication in comparison with the B-OTP received from the user terminal.
The method of claim 1,
In the first step
The user captures his face image using his smartphone, i.e., a camera module in the user terminal, generates the Biometric Image information Bi, and transmits it to the server along with the timestamp Tu. One-time password-based user authentication method using.
2. The method of claim 1, wherein in the second step, the server compares its time information Ts with Tu values received from the user terminal, and accepts them if they belong to a certain error range DELTA T and randomly generates a random value Rs value generated by the server. Biometric ID, which is the ID value of the user

One-time password-based user authentication using biometric information, characterized in that after transmitting the {BIDu, Ts} value along with the time information Ts of the server to the client, that is, the user terminal.
The method of claim 1, wherein in the third step, the user terminal accepts the value received from the server if it belongs to Tu-Ts < DELTA T and generates TIDu, XIDu and Cu values as shown in Equation 1 below. , The one-time password-based user authentication method using biometric information, characterized in that for transmitting the generated TIDu value and Cu value to the server.
[Equation 1]

The method of claim 1, wherein in step 4, the server uses TIDu and Cu values transmitted to the user terminal.

It creates a value and checks whether IDu == IDu * for the IDu information stored in its DB. If the same value is obtained, the validity of the ID information of the user terminal is checked. Using the received TIDu and Cu values, XIDu * and Cu * values are generated as shown in [Equation 2] to perform the authentication process for the user terminal, and the XIDu * values are stored in the DB of the PWu * value of the server. Generate and verify as shown in [Equation 2] below, but now compares the Cu value received from the user terminal and the Cu * value generated in the server, if the same value is generated, the server is the user's disposable biometric ID information The challenge value CH = (TIDu * | Rs | rand (Seq)) value is generated using the TIDu * value, and is transmitted to the user terminal. Authentication method.
&Quot; (2) &quot;

The method of claim 1, wherein in the fifth step, the user terminal generates an OTPu value by using the CH value received from the server as shown in [Equation 3] and transmits it back to the server, and the server receives the received value from the user terminal. The one-time password-based user authentication method using biometric information, characterized in that the OTPu * value is generated for the OTPu and the same value is generated.
&Quot; (3) &quot;
OTPu = H (XIDU | CH | BIDu)

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