CN112699358B - Application method of password safety protection device based on fingerprint sensor - Google Patents

Abstract

The invention discloses a method of using a password security protection device based on a fingerprint sensor. It includes a fingerprint sensor and a fingerprint entry module. The fingerprint sensor is connected through an analog-to-digital converter, an encryption module and a microcontroller in sequence. The fingerprint entry module is connected through another analog-to-digital conversion. The device is electrically connected to the microcontroller, and the microcontroller is electrically connected to the display. The present invention also provides a corresponding usage method, which includes the fingerprint entry module acquiring the user's fingerprint and converting the fingerprint into electrical signal data; converting the electrical signal data into corresponding numbers through an analog-to-digital converter and performing normalization processing. The invention can solve the problems in the prior art that passwords are easy to be stolen and the key experience is poor, and has high efficiency, strong accuracy and good security.

Description

A method of using a fingerprint sensor-based password security protection device

Technical field

The invention relates to the technical field of insurance unlocking, and in particular to a method of using a password security protection device based on a fingerprint sensor.

Background technique

Nowadays, ATM machines use buttons to enter passwords, but some criminals install special equipment on ATM machines to obtain user passwords. Usually, a miniature camera is installed above the keyboard to obtain the user's bank card password.

At present, the main problems of key-press password input include: the key experience is not good, the button material is hard, and it is easy to input errors; some illegal activities such as theft and fraud using ATMs often occur.

Contents of the invention

In view of the above-mentioned deficiencies in the prior art, the present invention provides a fingerprint sensor-based password security protection device that can solve the problems in the prior art that passwords are easy to be stolen and the key experience is poor.

In order to solve the above technical problems, the present invention adopts the following technical solutions:

The invention provides a method of using a password security protection device based on a fingerprint sensor, which includes the following steps:

S1. The fingerprint entry module obtains the user's fingerprint and converts the fingerprint into electrical signal data;

S2. Convert the electrical signal data into corresponding numbers through the analog-to-digital converter and perform normalization processing;

S3. Compare the normalized number with the number converted from the password stored in the microcontroller. When the numbers are the same, the authentication is completed, otherwise the password error is displayed.

The main beneficial effects of the above fingerprint sensor-based password security protection device provided by the present invention are:

The invention has higher security. Only the customer knows the password corresponding to the self-set fingerprint. In this way, even if the password is secretly photographed by an illegally installed camera when inputting the password, there is no need to worry about the password being leaked. Greater confidentiality than today's keystroke input technology. The fingerprint input method also optimizes the operating experience.

Description of the drawings

Figure 1 is a schematic structural diagram of a password security protection device based on a fingerprint sensor.

Figure 2 is a flow chart of a method of using a password security protection device based on a fingerprint sensor.

Among them, 1. Fingerprint sensor, 2. Analog-to-digital converter, 3. Encryption module, 4. Fingerprint entry module, 5. Analog-to-digital converter, 6. Keyboard, 7. Display, 8. Microcontroller.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings:

As shown in Figure 1, it is a flow chart of the fingerprint sensor-based password security protection device of the present invention.

The fingerprint sensor-based password security protection device of the present invention includes a fingerprint sensor 1 and a fingerprint entry module 4. The fingerprint sensor 1 is connected through an analog-to-digital converter 2, an encryption module 3 and a single-chip microcomputer 8 in sequence. The fingerprint entry module 4 is electrically connected to the single-chip computer 8 through another analog-to-digital converter 5 , and the single-chip computer 8 is electrically connected to the display 7 .

Among them, the microcontroller 7 is electrically connected to the keyboard 6 to cope with the situation when the fingerprint sensor 1 cannot be used.

Analog-to-digital converter 2 and analog-to-digital converter 5 are both 7135 model A/D converters. The model of the single-chip microcomputer 8 is the 8051 single-chip microcomputer.

Preferably, the fingerprint sensor 1 and the fingerprint entry module 4 have the same structure and are used for setting passwords and inputting passwords respectively.

The present invention also provides a method for using the password security protection device based on the above-mentioned fingerprint sensor, which is characterized in that, as shown in Figure 2, it includes the following steps:

S1. The fingerprint entry module 4 obtains the user's fingerprint and converts the fingerprint into electrical signal data.

S2. Convert the electrical signal data into corresponding numbers through the analog-to-digital converter 5 and perform normalization processing.

Among them, the normalized number is nine digits.

S3. Compare the normalized number with the number converted into the password stored in the microcontroller 8. When the numbers are the same, the authentication is completed, otherwise the password error is displayed.

Further, the password stored in the microcontroller 8 is obtained through the following steps:

S3-1. The fingerprint sensor 1 obtains the user's fingerprint and converts the fingerprint into electrical signal data.

S3-2. Convert the electrical signal data into corresponding numbers through the analog-to-digital converter 2, and perform normalization processing.

S3-3. Encrypt the normalized numbers to obtain the encrypted numbers.

Specifically, the encryption algorithm is:

For the i-th fingerprint, the converted array is x _{ij ,} where i=1,2,...,6, j=1,2,...,9; the encrypted array is

X _ij =x _ij +j.

S3-4. Store the encrypted number in the microcontroller 8 to obtain the password stored in the microcontroller 8 .

Further, the comparison method is:

For the user fingerprint information array converted by the analog-to-digital converter 5 to be Y _ij , when the condition is met: X _ij =Y _ij , the test passes.

The specific embodiments of the present invention are described above to facilitate those skilled in the art to understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes These changes are obvious within the spirit and scope of the invention as defined and determined by the appended claims, and all inventions and creations utilizing the concept of the invention are protected.

Claims (2)

1. The application method of the password safety protection device based on the fingerprint sensor is characterized by comprising the following steps of:

s1, a fingerprint input module acquires a user fingerprint and converts the fingerprint into electric signal data;

s2, converting the electric signal data into corresponding numbers through an analog-to-digital converter, and carrying out normalization processing;

s3, comparing the normalized numbers with the numbers converted from the passwords stored in the singlechip, and finishing authentication when the numbers are the same, otherwise, displaying password errors; the method specifically comprises the following steps:

the password stored in the singlechip is obtained through the following steps:

s3-1, a fingerprint sensor acquires a user fingerprint and converts the fingerprint into electric signal data;

s3-2, converting the electric signal data into corresponding numbers through an analog-to-digital converter, and carrying out normalization processing;

s3-3, encrypting the normalized numbers to obtain encrypted numbers;

s3-4, storing the encrypted numbers in the singlechip to obtain passwords stored in the singlechip;

the encryption algorithm is as follows:

the array for the ith fingerprint transform is x _ij Wherein i=1, 2, … …,6,j =1, 2, … …,9; the encrypted array is X _ij The following relationship exists:

X _ij ＝x _ij +j

the comparison method comprises the following steps:

the user fingerprint information array converted by the analog-to-digital converter is Y _ij When the condition is satisfied:

X _ij ＝Y _ij at that time, the test passed.

2. The method of claim 1, wherein the normalized numbers are nine digits.