TW201500958A - Personal data encryption/decryption system based on fingerprint and chaotic electrocardiographic signal - Google Patents

Abstract

The present invention relates to a personal data encryption/decryption system based on fingerprint and chaotic electrocardiographic signal, which comprises: an encryption device and a decryption device. The encryption device comprises a two-point electrocardiographic signal retrieval device, a first fingerprint retrieval device, and a chaos encryption unit. The decryption device comprises a second fingerprint retrieval device, an identity recognition unit, a data transmission part, and a chaos decryption unit. The chaos encryption unit and the chaos decryption unit transform an electrocardiographic signal into a phase plane through phase space reconstruction so as to obtain four electrocardiographic signal characteristic values <lambda>1 to <lambda>4, which are subjected to a predetermined operation to obtain a final characteristic value <lambda>f that is used as an initial value of a chaotic function to generate a chaotic series necessary for encryption/decryption of images and texts, in order to perform encryption/decryption of data. Thus, the present invention offers the advantage and effect of high security.

Description

Personal data encryption/decryption system based on fingerprint and chaotic ECG signals

The invention relates to a personal data encryption/decryption system based on fingerprint and chaotic ECG signals, in particular to a personal data encryption/decryption system based on fingerprint and chaotic ECG signals with predetermined calculation, which has security The advantages and effects of high sex.

In general chaotic encryption and decryption devices, the user needs to set a password (initial value) and remember it before encrypting the personal data for use in decryption. This setting method is easy to forget the password for a long time.

Of course, in addition to the above-mentioned problems that are easy to forget, the general password setting is nothing more than the combination of numbers, English and symbols. Because of the traceability, it is easy to be cracked and copied, and still exists in use. Concerns about safety.

Therefore, it is necessary to develop new products to solve the above shortcomings and problems.

The object of the present invention is to provide a personal data encryption/decryption system based on fingerprint and chaotic ECG signals, which has the advantages and functions of high security, and solves the problem of low security of the prior art.

The technical means for solving the above problems provides a personal data encryption/decryption system based on fingerprint and chaotic ECG signals, comprising: an encryption device having a two-point ECG signal acquisition device, a first fingerprint capture device for measuring a user's ECG signal; the first fingerprint capture device for capturing the user a fingerprint feature of the finger; and the chaotic encryption unit has a chaotic encryption unit and a first processing unit, the chaotic encryption unit includes a chaotic function of the ECG feature value extraction and graph and text encryption, and the chaotic encryption The faculty transforms the ECG signal waveform into the phase plane via phase space reconstruction, and obtains four ECG eigenvalues λ ₁ ~ λ ₄ , and obtains a final eigenvalue λ _F through a predetermined operation as the initial of the chaotic function. a value, which further generates a chaotic sequence required for image and text encryption for data encryption; and the first processing unit is configured to output a fingerprint feature captured by the first fingerprint capture device, and the final feature value λ _F a predetermined operation mode and data encrypted by the chaotic encryption unit; the first decryption device has a second fingerprint capture device, an identity recognition unit, a data transmission unit, and a chaotic decryption unit; the second fingerprint capture device is The fingerprint identification feature is used to capture the fingerprint feature of the user's finger; the identity recognition unit is configured to compare the fingerprint feature captured by the first fingerprint capture device and the second fingerprint capture device, and thereby identify the user The data transmission unit is configured to provide an external device to input the ECG signal data into the chaotic decryption unit; and the chaotic decryption unit has a second processing unit and a chaotic decryption unit, wherein the second processing unit is configured to receive the The first processing device outputs a fingerprint feature captured by the first fingerprint capture device, a predetermined operation mode of the final feature value λ _F , and a data encrypted by the chaotic encryption unit, and the chaotic decryption unit includes an ECG signal feature. The value captures the chaotic function required for the decryption of the graph and the text, and the chaotic decryption unit transfers the ECG signal waveform to the phase plane via phase space reconstruction to obtain four ECG signals. The eigenvalues λ ₁ ~ λ ₄ are obtained by a predetermined operation to obtain a final eigenvalue λ _F as an initial value of the chaotic function, thereby generating a chaotic sequence required for the image and text decryption, and decrypting the encrypted data.

The above objects and advantages of the present invention will be readily understood from the following detailed description of the preferred embodiments illustrated herein.

The invention will be described in detail in the following examples in conjunction with the drawings:

10‧‧‧Encryption device

11‧‧‧Two-point ECG signal extraction device

12‧‧‧First fingerprint capture device

13‧‧‧Chaotic encryption unit

131‧‧‧Chaotic Encryption Department

132‧‧‧First Processing Department

20‧‧‧Decryption device

21‧‧‧Second fingerprint capture device

22‧‧‧identity unit

23‧‧‧Data Transmission Department

24‧‧‧Chaotic decryption unit

241‧‧‧Second Processing Department

242‧‧‧Chaotic Decryption Department

71‧‧‧External devices

The first figure is a schematic diagram of a personal data encryption/decryption system based on fingerprint and chaotic ECG signals of the present invention.

The second figure is a schematic diagram of the fingerprint and electrocardiogram of the present invention.

The third figure is a schematic diagram of the encryption and decryption relationship of the present invention.

Figure 4A is a schematic diagram of the user's ECG signal of the present invention.

Figure 4B is a schematic diagram of a chaotic attractor of the user of the present invention

Figure 5A is a schematic diagram of the user's ECG signal of the present invention.

Figure 5B is a schematic diagram of the chaotic attractor of the user of the present invention

Figure 6A is a schematic diagram of the user's heart electronic signal of the present invention.

Figure 6B is a schematic diagram of the chaotic attractor of the user of the present invention

Figure 7A is a schematic diagram of the heartbeat signal of the user of the present invention.

Figure 7B is a schematic diagram of the chaotic attractor of the user of the present invention

Figure 8A is a schematic diagram of the user's heart signal of the present invention

Figure 8B is a schematic diagram of the chaotic attractor of the user of the present invention

Figure 9A is a schematic diagram of the user's heart signal of the present invention.

Figure 9B is a schematic diagram of the chaotic attractor of the user of the present invention

The tenth figure is a schematic diagram of the encryption process of the present invention

11A is a schematic view of the original image of the gray scale image of the present invention

The eleventh B is a schematic diagram of the original image pixel analysis of the gray scale image of the present invention.

FIG. 11C is a schematic diagram of an encrypted image of a gray scale image of the present invention

11th D is a schematic diagram of pixel analysis of encrypted image of gray scale image of the present invention

The eleventh E is a schematic diagram of the error decryption image of the gray scale image of the present invention.

The eleventh F diagram is a schematic diagram of the correct decryption image of the gray scale image of the present invention

Figure 12A is a schematic diagram of the original image of the index image of the present invention

The twelfth B-picture is a schematic diagram of the original image pixel analysis of the index image of the present invention

Twelfth C is a schematic diagram of an encrypted image of the index image of the present invention

Twelfth D is a schematic diagram of pixel analysis of an encrypted image of an index image of the present invention

Twelfth E is a schematic diagram of an error decrypted image of the index image of the present invention

The twelfth F-picture is a schematic diagram of the correct decrypted image of the index image of the present invention

Figure 13A is a schematic diagram of the original image of the RGB image of the present invention.

Figure 13B is a schematic diagram of the original image pixel analysis of the RGB image of the present invention.

The thirteenth Cth diagram is a schematic diagram of the original image pixel analysis of the RGB image of the present invention.

The thirteenth D-picture is a schematic diagram of the original image pixel analysis of the RGB image of the present invention

Figure 13E is a schematic diagram of an encrypted image of the RGB image of the present invention.

The thirteenth Fth diagram is a schematic diagram of the pixel analysis of the encrypted image of the RGB image of the present invention.

The thirteenth G diagram is a schematic diagram of the second embodiment of the encrypted image pixel analysis of the RGB image of the present invention.

The thirteenth H picture is a schematic diagram of the encrypted image pixel analysis of the RGB image of the present invention

The thirteenth I picture is a schematic diagram of the erroneous decryption image of the RGB image of the present invention

The thirteenth J diagram is a schematic diagram of the correct decrypted image of the RGB image of the present invention

Figure 14A is a schematic view of the present invention

Figure 14B is a schematic diagram of the encrypted ciphertext of the present invention

Figure 14C is a schematic diagram of the text of the decryption error of the present invention

The fourteenth D diagram is a schematic diagram of the plaintext after the correct decryption of the present invention

As shown in the first to third figures, the present invention is a personal data encryption/decryption system based on fingerprint and chaotic ECG signals, comprising: an encryption device 10 and a decryption device 20.

The encryption device 10 has a two-point ECG capture device 11, a first fingerprint capture device 12, and a chaotic encryption unit 13; the two-point ECG capture device 11 is used. Measuring the heart signal of a user; the first fingerprint capturing device 12 is configured to capture the fingerprint feature of the user's finger; and the chaotic encryption unit 13 has a chaotic encryption unit 131 and a first processing unit. 132. The chaotic encryption unit 131 includes a chaotic function required for ECG signature extraction and graph and text encryption, and the chaotic encryption unit 131 converts the ECG waveform to phase via phase space reconstruction. In the plane, four ECG eigenvalues λ ₁ ~ λ ₄ (Lyapunov exponent, Lyapunov exponent in English) are obtained, and a final eigenvalue λ _{F is obtained} as a preliminary value of the chaotic function through a predetermined operation. The chaotic sequence required for the encryption of the image and the text is generated for data encryption. The first processing unit 132 is configured to output the fingerprint feature captured by the first fingerprint capture device 12 and the predetermined operation mode of the final feature value λ _F . And the chaos plus The first fingerprint capture device 12 and the two-point ECG capture device 11 are substantially on the same plane. When the user's finger presses on the plane, the system is The first fingerprint capturing device 12 and the two-point ECG signal capturing device 11 are simultaneously contacted, and the fingerprint capturing and the electrocardiogram measurement can be simultaneously performed.

The decryption device 20 has a second fingerprint capture device 21, an identity recognition unit 22, a data transmission unit 23, and a chaotic decryption unit 24; the second fingerprint capture device 21 is configured to capture the user. a fingerprint feature of the finger; the identity recognition unit 22 is configured to identify the fingerprint of the user by comparing the fingerprint features captured by the first fingerprint capture device 12 and the second fingerprint capture device 21; The data transmission unit 23 is provided with an external device 71 for inputting the electrocardiogram signal data into the chaotic decryption unit 24; and the chaotic decryption unit 24 has a second processing unit 241 and a chaotic decryption unit 242, and the second processing unit 241 is used. The chaotic decryption is performed by receiving the fingerprint feature captured by the first fingerprint capture device 12 output by the first processing device 132, the predetermined operation mode of the final feature value λ _F , and the data encrypted by the chaotic encryption unit 131. The portion 242 includes a chaotic function required for the ECG feature value extraction and the image and text decryption, and the chaotic decryption unit 241 transfers the ECG signal waveform to the phase plane via phase space reconstruction to obtain four ECG signal feature values. λ ₁ ~ λ ₄ , and a final eigenvalue λ _{F is obtained} as a preliminary value of the chaotic function through a predetermined operation, thereby generating a chaotic sequence required for the image and text decryption, and decrypting the encrypted data.

In more detail, the user needs to perform fingerprint capture before encrypting the personal data, and then measure and store the personal ECG signal (as shown in the second figure); the personal ECG signal can be stored in an external device 71 ( For example, a USB flash drive, and the fingerprint feature is outputted by the first processing unit 132 to the second processing unit 241, so that the identity recognition unit 22 can compare the first fingerprint capture device 12 and the second The fingerprint feature captured by the fingerprint capture device 21.

Since the ECG signal is difficult to see in the time domain, the ECG waveform is transferred to the phase plane via phase space reconstruction, and the chaotic attractor of the user's heart signal is clearly visible.

As shown in the fourth A to ninth B, it is an ECG signal and a chaotic attractor for 6 users respectively. The chaotic encryption unit 131 extracts the electrocardiographic characteristic value, and obtains a final eigenvalue λ _F through a predetermined operation as an initial value of the chaotic function as an initial value of the chaotic function, thereby generating a chaotic sequence required for image and text encryption. Data encryption.

The predetermined calculation method of the final feature value λ _F can be set by the user, and the first processing unit 132 outputs the predetermined calculation mode to the second processing unit 241 (the encrypted data is also output by the first processing unit 132 as well. The second processing unit 241) obtains the same final eigenvalue λ _F after performing the predetermined calculation on the chaotic encryption unit 131 and the chaotic decryption unit 242 by the same electrocardiographic signal.

With regard to the predetermined calculation method of the final eigenvalue λ _F , the following two custom formulas are described: Please refer to the first table, assuming that all six users draw four ECG eigenvalues λ ₁ ~ λ ₄ , and after the operation of equation (1), the final eigenvalues λ of six users can be obtained respectively. _F.

Please refer to the second table, six users are assumed to retrieve four ECG signal eigenvalues λ ₁ ~ λ _4, after Equation (2) the operation system can obtain the final values of [lambda] wherein six users, respectively _F.

It can be known from the comparison between the first table and the second table that in the case of the same ECG signal (the values of the four ECG signal values λ ₁ ~ λ ₄ are unchanged), the final result is obtained by the change of the operation mode. The eigenvalue λ _F is also different, although the values of λ ₁ ~ λ _{4 of} different subjects are not much different, but the difference of the final eigenvalue λ _F can be enlarged by the synthesis operation; that is, the present invention utilizes such an operation process To obtain a non-regular final eigenvalue λ _F , which can effectively improve the security of encrypted data.

The foregoing calculation formulas (1) and (2) are only a synthesis method of λ ₁ ~ λ ₄ , and other synthesis methods are also feasible as long as different final eigenvalues λ _F can be generated.

In the operation mode of the chaotic function, it can also be set by the user, and the final eigenvalue λ _{F is} used as the initial value of the chaotic function, thereby generating the chaotic sequence required for the decryption of the graph and the text; and regarding the operation mode of the chaotic sequence, The series is illustrated by the following two custom formulas: [A] Text: 1D Logistic Map L _{n +1} = AL _n (1- L _n )------------( 1); Please refer to the third table, the invention is encrypted with a piece of text as "space, space, I, A, M, enter" (the ENTER symbol after M, indicating the end of the line) Make a line break).

First, convert characters such as spaces, spaces, I, A, and M to ASCII codes to 64, 64, 73, 65, and 77; assuming L ₀ = λ _F = 0.01, A = 0.38, iterative formula (1) After five times, we get: L ₁ =0.0376; L ₂ =0.1376; L ₃ =0.4509; L ₄ =0.9408; L ₅ =0.2115; multiply L ₁ ~ L ₆ by 10 and take the ones digit to get 0 1, 4, 9, 2, and add 32, 32, 73, 65, 77 after conversion characters to ASCII codes, get 32, 33, 77, 74, 79, then 32, 33, 77 , 74, 79 converted back to characters, the text presented is changed to! , $, R, C, S, complete the encryption of the text.

Similarly, if the final final eigenvalue λ _{F is} replaced as the initial value of the chaotic function, different results will be obtained through the above process.

The above is a single-line operation. If there is more than one line in an article, it will be processed line by line according to the same principle, and the whole text can be encrypted.

[B] pattern: using the aforementioned one-dimensional logistic map (Listic ₊₁ ) L _{n +1} = AL _n (1- L _n ) and two-dimensional Hainan map (Henon Map) The invention is characterized by pattern encryption in a pixel matrix in a partial block of a 5×5 pattern; first, the pixel scrambling process is performed, please refer to the fourth table. For convenience of description, the present invention lists only the first Five pixels of the line to illustrate, and the rest are analogous.

Assume that the R value of the RGB values of the five pixels of the first line (of course, G or B can also be used) is 17, 35, 42, 12, 255, respectively, and set L ₀ = λ _F = 0.01, A = 3.8 After iteration 5 times, it is obtained: L ₁ =0.0376; L ₂ =0.1376; L ₃ =0.4509; L ₄ =0.9408; L ₅ =0.2115; respectively, after multiplying by 10, then 0, 1, 4, 9, 2.

Then add the R value of the five pixel values respectively to get the new R value 17, 36, 46, 21, 257 (→ 2), but if 257 exceeds 255, subtract 255 to make it fall from 0 to 255. In the same way (in the same way, if the reverse decryption is over the range of 0~255, the same reverse processing is performed), and the R value of the original pixel is disturbed, and the original color cannot be distinguished.

When the pixel value is scrambled, the (i, j) position will be disturbed, assuming X ₀ = Y ₀ = λ _F = 0.01, a = 1.4, b = 0.3, and the iteration formula (2) is obtained five times: X ₁ =1.0029, Y ₁ =0.0100; X ₂ =-0.4050, Y ₂ =1.0029; X ₃ =1.0712, Y ₃ =-0.4050; X ₄ =-0.7280, Y ₄ =1.0712; X ₅ =0.5795,Y ₅ =-0.7280; Sorting the values of X1 to X5 and the values of Y1 to Y5 from large to small will result in: X order: original is 1, 2, 3, 4, 5, becomes 3, 1, 5 , 2, 4; Y order: the original is 1, 2, 3, 4, 5, becomes 4, 2, 1, 3, 5; the original (i, j) becomes (i, in the new order mentioned above) ',j'), for example, the original (1,1) position is changed to the new (3,4) position; the original (1,2) position is changed to the new (3,2) position, This type of push. If it is a picture of 800x600, the iterative formula (2) of the two-dimensional Henon Map can be performed, for example, 1500 iterations (optional increase or decrease), and after iteration, 1500 X values and 1500 Y values can be obtained. Delete the same value and move forward, then take the first 800 X and the first 600 Y, respectively, to sort the big to the small, and record the correspondence between the new X and Y sequences. Under (ie, two-dimensional index data), you can use this method to disrupt the location of 800x600.

When the pixel value is scrambled and the (i, j) position is also scrambled, the encryption of the pattern is completed.

For the process of encryption of the present invention, please refer to the tenth figure.

In terms of decryption, the user must first capture the fingerprint for identification after decryption. After the identity recognition unit 22 confirms that the encryptor is correct, the chaotic ECG signal of the encryptor is used as the interpretation key ( The stored personal electrocardiogram signal is outputted to the data transmission unit 23) by the external device 71, and the decryption process is performed.

Regarding the image addition/decryption result of the present invention, the result of actual addition/decryption is described by the types of three different image files.

[I] Image file 1: Grayscale image. Please refer to the 11th to 11th F drawings, which are the original image of the image file, the original image pixel analysis, the encrypted image, the encrypted image pixel analysis, the error decryption image and the correct decryption image.

[II] Figure 2: Index image. Please refer to the 12th to 12th F pictures, which are the original image of the image file 2, the original image pixel analysis, the encrypted image, the encrypted image pixel analysis, the error decryption image and the correct decryption image.

[III] Figure 3: RGB image. Please refer to Figures 13A to 13F. Figure 13A is the original image of Figure 3, and the 13th, 13th and 13th D drawings. The original image pixel analysis of the third, the encrypted image of the third image of the thirteenth E picture file, the encrypted image pixel analysis of the thirteenth F, the thirteenth G, and the thirteenth H series image file, the thirteenth I picture system The file of the third file is decrypted by the error, and the thirteenth J picture is the correct decryption image.

It can be known from the encryption and decryption results of the above three images that when the error is decrypted, the obtained image is completely unrecognizable, and the security of the original image can be effectively protected.

For the encryption and decryption results of the text, please refer to the fourteenth to the fourteenth Dth, which are respectively the plaintext, the encrypted ciphertext, the text of the decryption error, and the plaintext after the correct decryption; When decrypting, the obtained text arrangement can not recognize the content at all, which can effectively protect the security of the original text.

In summary, the advantages and effects of the present invention can be summarized as follows: [1] High security. The invention can not only encrypt the text in a chaotic sequence, but also can not recognize the content of the text in the case of undeciphering, and can perform decryption when the decryption is performed, and the fingerprint feature and the personal electrocardiogram are required to be decrypted. The non-general random number decoding can decrypt the decryption program, so it has the advantage of high security.

The present invention has been described in detail with reference to the preferred embodiments of the present invention, without departing from the spirit and scope of the invention.

From the above detailed description, it will be apparent to those skilled in the art that the present invention can achieve the foregoing objects, and the invention has been in accordance with the provisions of the patent law.

10‧‧‧Encryption device

11‧‧‧Two-point ECG signal extraction device

12‧‧‧First fingerprint capture device

13‧‧‧Chaotic encryption unit

131‧‧‧Chaotic Encryption Department

132‧‧‧First Processing Department

20‧‧‧Decryption device

21‧‧‧Second fingerprint capture device

22‧‧‧identity unit

23‧‧‧Data Transmission Department

24‧‧‧Chaotic decryption unit

241‧‧‧Second Processing Department

242‧‧‧Chaotic Decryption Department

71‧‧‧External devices

Claims (2)

A personal data encryption/decryption system based on fingerprint and chaotic ECG signals, comprising: an encryption device having a two-point ECG signal acquisition device, a first fingerprint capture device, and a chaotic encryption The two-point ECG signal acquisition device is configured to measure a user's ECG signal; the first fingerprint capture device is configured to capture a fingerprint feature of the user's finger; and the chaotic encryption unit The system has a chaotic encryption unit and a first processing unit. The chaotic encryption unit includes a chaotic function required for ECG eigenvalue extraction and graph and text encryption, and the chaotic encryption unit reconstructs the heart telegram via phase space reconstruction. The waveform of the number is transferred to the phase plane to obtain four ECG eigenvalues λ ₁ ~ λ ₄ , and a final eigenvalue λ _{F is} obtained through a predetermined operation as the initial value of the chaotic function, thereby generating graph and text encryption. The required chaotic sequence is used for data encryption; further, the first processing unit is configured to output a fingerprint feature captured by the first fingerprint capture device, a predetermined operation mode of the final feature value λ _F , and a chaotic encryption unit Encrypted data; a decryption device having a second fingerprint capture device, an identity recognition unit, a data transmission portion, and a chaotic decryption unit; the second fingerprint capture device is configured to capture the user a fingerprint feature of the finger; the identification unit is configured to identify the identity of the user by comparing the fingerprint feature captured by the first fingerprint capture device and the second fingerprint capture device; the data transmission portion An external device is configured to input the ECG signal data into the chaotic decryption unit; and the chaotic decryption unit has a second processing unit and a chaotic decryption unit, wherein the second processing unit is configured to receive the output of the first processing device a fingerprint feature captured by the first fingerprint capture device, a predetermined operation mode of the final feature value λ _F , and a data encrypted by the chaotic encryption unit, and the chaotic decryption unit includes an ECG feature value extraction and graph and text Decrypting the required chaotic function, and the chaotic decryption unit transfers the ECG signal waveform to the phase plane via phase space reconstruction to obtain four ECG signal values λ ₁ ~ λ ₄ , and After the predetermined operation, a final eigenvalue λ _{F is obtained} as the initial value of the chaotic function, thereby generating a chaotic sequence required for the image and text decryption, and decrypting the encrypted data. For example, the fingerprint data and the chaotic ECG signal-based personal data encryption/decryption system described in claim 1 of the patent application, wherein the external device is a USB flash drive.