TWI579774B - Fingerprint Sensing Integral Circuit and Its Disturbing Encryption Method - Google Patents

Description

Fingerprint sensing integrated circuit and its scrambling encryption method

The present invention relates to a fingerprint sensing integrated circuit (IC), and more particularly to a fingerprint sensing integrated circuit capable of encrypting fingerprints and its scrambling encryption method.

The conventional fingerprint sensing system is to make the fingerprint sensing and identification functions in the same integrated circuit, and putting all the functions into the same integrated circuit makes the system circuit less flexible and has the wafer yield. The problem. In addition, in many applications, fingerprint sensing and identity recognition functions need to be separated and respectively configured on the user end and the system main control end and connected by a transmission interface, as shown in FIG. 1 , when the fingerprint sensing IC 13 senses and The fingerprint image information of the finger is obtained, and a transmission interface (TX/RX interface) 191 transmits the fingerprint image information to the system host 15 to identify whether the identity of the user is correct. However, when the fingerprint interface information is transmitted by the transmission interface 191, the fingerprint image information may be recorded, for example, using the transmission interface 193 of the same specification as the transmission interface 191 to record the fingerprint image information to the illegal system host 17 . As shown in FIG. 2, the fingerprint image information that has been recorded is stored in a storage device 18, and the illegal user uses the storage device 18 instead of the fingerprint sensing IC 13 to send the fingerprint image information via the same specification as the transmission interface 191. When the transmission interface 195 is delivered to the system main control terminal 15, the illegal user can pass the discrimination. Therefore, fingerprint image information needs to be encrypted to enhance the security of fingerprint transmission. However, existing encryption circuits are limited by fingerprints Sensing the area of the integrated circuit, it is not possible to add a static random access memory (SRAM), a dynamic random access memory (DRAM) or a flash memory to design an encryption circuit when integrated into a single IC.

One of the objects of the present invention is to provide a fingerprint sensing IC capable of encrypting fingerprints and its scrambling encryption method.

According to the present invention, a fingerprint sensing IC includes a fingerprint sensing component for sensing a fingerprint and generating a first fingerprint image information, and a linear feedback displacement register generates a plurality of disturbance values according to an initial value and a disturbance. The encryption circuit scrambles and encrypts the first fingerprint image information using the plurality of scrambling values to generate an encrypted second fingerprint image information. The data amount of the first fingerprint image information is the same as the data amount of the second fingerprint image information, so the data transmission process does not cause delay or delay.

According to the present invention, a scrambling encryption method for a fingerprint sensing IC includes sensing a fingerprint to generate a first fingerprint image information, generating a plurality of scrambling values by using an initial value, and using the plurality of scrambling values to the first fingerprint image. The information is scrambled to generate an encrypted second fingerprint image information and transmitted to the system controller for fingerprint authentication via the transmission interface. The data amount of the first fingerprint image information is the same as the data amount of the second fingerprint image information, so the data transmission process does not cause delay or delay.

According to the present invention, a fingerprint sensing IC includes a fingerprint sensing component, a linear feedback shift register, and a scrambling encryption circuit. The fingerprint sensing component senses the fingerprint and generates a first fingerprint image information, the first fingerprint image information being divided into a plurality of segments, each segment comprising a plurality of first pixel data. The linear feedback displacement register is corresponding to the segment currently to be encrypted The initial value produces multiple scrambling values. The scrambling encryption circuit scrambles the plurality of first pixel data of the segment to be currently encrypted using the plurality of scrambling values to generate a plurality of second pixel data. The second fingerprint image information is formed by all the second pixel data generated by the scrambling and encrypting, and the fingerprint sensing integrated circuit transmits the second fingerprint image information to the second fingerprint image to the second fingerprint image. A remote control system performs fingerprint authentication. The amount of data of the first fingerprint image information is the same as the amount of data of the second fingerprint image information, so the data transmission process does not cause delay or delay.

According to the present invention, a scrambling encryption method for a fingerprint sensing IC includes sensing a fingerprint to generate a first fingerprint image information; dividing the first fingerprint image information into a plurality of segments, each segment including a plurality of segments a pixel data; providing an initial value according to the segment currently to be encrypted; generating a plurality of scrambling values by using the initial value; and using the plurality of scrambling values to perform the plurality of first pixel data of the segment to be currently encrypted The encryption is scrambled to produce an encrypted plurality of second pixel data. The second fingerprint image information is formed by all the second pixel data generated by the scrambling and encrypting, and the second fingerprint image information is transmitted to the system controller for fingerprint authentication via the transmission interface. The data amount of the first fingerprint image information is the same as the data amount of the second fingerprint image information, so the data transmission process does not cause delay or delay.

The invention does not need to use SRAM, DRAM or flash memory to encrypt the fingerprint, so it does not affect the area of the integrated fingerprint sensing IC.

13‧‧‧Fingerprinting Wafer

15‧‧‧System master

17‧‧‧Illegal system master

18‧‧‧Storage device

191‧‧‧Transport interface

193‧‧‧Transport interface

195‧‧‧Transport interface

20‧‧‧Fingerprint Sensing IC

21‧‧‧ Fingerprint sensing components

213‧‧‧First fingerprint image information

23‧‧‧Linear feedback shift register

231‧‧‧ initial value

233‧‧‧Disruption value

25‧‧‧Disrupted encryption circuit

253‧‧‧Second fingerprint image information

27‧‧‧Transport interface

29‧‧‧System master

31‧‧‧ Mutual exclusion or gate

33‧‧‧ Mutual exclusion or gate

35‧‧‧mutual exclusion or gate

37‧‧‧Exclusive or gate

39‧‧‧ Mutual exclusion or gate

40‧‧‧Initial value generator

41‧‧‧ Seeds

43‧‧‧ Mutual exclusion or gate

45‧‧‧mutual exclusion or gate

47‧‧‧Exclusive or gate

49‧‧‧Exclusive or gate

1 is a conventional fingerprint authentication system; FIG. 2 shows a conventional manner of using fingerprint image information for side recording; FIG. 3 shows an embodiment of the fingerprint sensing integrated circuit of the present invention; Figure 4 is an embodiment of the linear feedback shift register of Figure 3; Figure 5 is an embodiment of the scrambling encryption circuit of Figure 3; Figure 6 shows a first embodiment of the initial value generator; Figure 7 shows the initial value generator Second Embodiment; FIG. 8 shows a third embodiment of the initial value generator; FIG. 9 shows a fourth embodiment of the initial value generator; FIG. 10 shows a first embodiment of the segmentation of the first fingerprint image information. FIG. 11 shows a second embodiment of segmentation of first fingerprint image information; and FIG. 12 shows a third embodiment of segmentation of first fingerprint image information.

Referring to FIG. 3, the fingerprint sensing IC 20 of the present invention includes a fingerprint sensing component 21, a linear feedback shift register (LFSR), and a scrambling encryption circuit 25. When the user's finger touches the fingerprint sensing IC 20, the fingerprint sensing component 21 senses the finger fingerprint to generate a first fingerprint image information, and the linear feedback displacement register 23 generates a plurality of disturbances according to an initial value 231. The value 233, the scrambling encryption circuit 25 uses the plurality of scrambling values 233 provided by the linear feedback shift register 23 to scramble the first fingerprint image information 213 provided by the fingerprint sensing element 21 to generate an encrypted second fingerprint image information 253. The fingerprint sensing IC 20 then transmits the second fingerprint image information 253 to the system host 29 via the transmission interface 27 for fingerprint authentication. In this example, even if the second fingerprint image information 253 is side-recorded in the transmission, if there is no decoding key such as the initial value 231 and the scramble value 233, the real fingerprint cannot be obtained at the system master, on the other hand, even if The other pipeline obtains the fingerprint of the user. If there is no initial value 231 and the scramble value 233, it cannot be correctly encrypted and then sent to the system host 29 for decryption via the transmission interface, thereby improving the security of fingerprint transmission.

4 is an embodiment of the linear feedback shift register 23 of FIG. 3 including a plurality of registers R0-R15 and a plurality of mutually exclusive gates 31, 33, 35 and 37. The linear feedback shift register 23 of Fig. 3 can be represented by a linear polynomial P(x) = x ¹⁶ + x ¹⁵ + x ¹² + x ⁷ + x ³ +1. After the initial value 231 is loaded into the linear feedback shift register 23, each bit of the initial value 231 is stored in the corresponding register R0-R15. In this embodiment, the initial value 231 has 16 bits. In other embodiments, the linear polynomial P(x) can be changed as needed to change the type of the linear feedback shift register 23, and also the number of bits of the initial value 231. The linear feedback shift register 23 can shift the bit value stored in the register R0-R15 according to a clock signal. For example, when the pulse signal triggers a pulse, the displacement is performed once, and the clock signal can be linearly returned. The circuit is provided internally or externally to the shift register 23. When the linear feedback shift register 23 of this embodiment performs displacement, the mutex or gate 37 generates the bit value XOR1 according to the current bit value of the registers R14 and R15, and the exclusive or gate 35 is based on the register R11. The current bit value and the bit value XOR1 generate the bit value XOR2, and the mutex or gate 33 generates the bit value XOR3 according to the current bit value of the register R6 and the bit value XOR2, and the mutual exclusion or gate 31 is temporarily stored. The current bit value and bit value XOR3 of the device R2 generates the bit value XOR4 to the register R0, and the original bit value in the register R0 is shifted to the next register R1, and the register R1 is in the original Some bit values are shifted to the next register R2, and so on, the original bit values in the scratchpad R2-R14 are shifted to the next register R3-R15. In FIG. 3, the number of mutually exclusive or gates and the register or mutual exclusion or gate to which the input is connected can be changed as needed, that is, the type of the linear feedback shift register 23 is changed, and In other embodiments, other logic operations may be used in place of the mutex or gate. Since the linear feedback shift register has its periodic characteristics, it is preferable to limit the number of shifts in order to avoid the same scrambled value and to be reverse-deciphered.

The linear feedback shift register 23 of FIG. 4 is performing bit after loading the initial value 231. After shifting or performing at least one displacement, the linear feedback shift register 23 provides the first scrambled value S0={R0, R1, R2, R4, R8, R10, R11, including the bit value of the register R0, R13}, after at least one displacement, the linear feedback shift register 23 provides a second scrambled value S1={R0, R1, R2, R4, R8, R10, R11, R13}, and so on, each A disturbance value Sn is generated after at least one displacement. In the embodiment of FIG. 4, the registers R0, R1, R2, R4, R8, R10, R11, R13 are selected to obtain an 8-bit scrambled value Sn, but in other embodiments, in addition to the register R0. In addition to being necessary, the remaining registers can be freely selected to determine the scrambling value, and the number of bits of the scrambled value Sn can be increased or decreased.

5 is an embodiment of the scrambling encryption circuit 25 of FIG. 3 including a mutex or gate 39. The first fingerprint image information 213 includes a plurality of first pixel data PBn, and the mutual exclusion or gate 39 mutually exclusiveizes or operates each of the first pixel data PBn and a scramble value Sn to generate a second fingerprint image information. Pixel data Dn=PBn ⊕ Sn, where n is an integer, and the linear equation P(x)=x ¹⁶ +x ¹⁵ +x ¹² +x ⁷ +x ³ obtained according to the linear feedback shift register 23 of Fig. 4 +1, n ranges from 0 to 4095. As shown in FIG. 4 and FIG. 5, the encryption method of the present invention requires only the scratchpads R0-R15 and the logic operation circuit, and does not require the use of SRAM, DRAM or flash memory. In addition, the first pixel data PBn before encryption and the encrypted second pixel data Dn have the same number of bits, which are all 8-bit, so the total number of data before encryption is the same as the total number of encrypted data, and the fingerprint is processed. In the process of encryption and decryption of information, there is no delay or delay in data transmission, and the fingerprint image information can be smoothly transmitted.

The initial value 231 in FIG. 3 can be directly generated by the system main control terminal 29 and then provided to the fingerprint sensing IC 20 via the transmission interface, or directly generated by the fingerprint sensing IC 20, or by the system main control terminal 29 and The fingerprint sensing IC 20 is directly generated by the agreement. The initial value 231 can be a fixed value It may also be a variable value. The fixed initial value 231 needs to be buried in the hardware of the fingerprint sensing IC 20 and the system main control terminal 29 to prevent the software from being cracked. If the initial value of the change 231 is set, the random variation or the conditional change may be set. .

The initial value 231 can be generated indirectly in addition to being directly generated. The method of indirectly generating the initial value 231 needs to define one or more seeds, and the seed is a fixed value, which can be buried in the hardware of the system main control terminal and the fingerprint sensing IC to prevent the software from being cracked, and the system main control terminal 29 And the fingerprint sensing IC 20 needs another linear feedback shift register as the initial value generator 40 for generating the initial value 231, as shown in FIG. In this way, the initial value 231 is not transmitted in the transmission interface 27. Instead of the initial value 231, a set of standardized bit sequences is transmitted in the transmission interface 27, so the illegal user can only steal bits from the transmission interface. The meta-sequence cannot get the correct initial value of 231. The bit sequence can be transmitted to the fingerprint sensing IC 20 by the system master 29 or can be transmitted to the system host 29 by the fingerprint sensing IC 20, or can be transmitted to each other after agreement. The agreement between the two parties is transmitted by the fingerprint sensing IC 20 to the system host 29 for a group of information, such as 00000001, and the system master 29 is also transmitted to the fingerprint sensing IC 20 for another group of information, for example, 10000000, the system master The terminal 29 and the fingerprint sensing IC 20 combine or operate the two sets of information to obtain a one-bit sequence, for example, 10000001. After the system main control terminal 29 and the fingerprint sensing circuit 20 synchronously obtain the bit sequence, the initial value generator 40 of each of the system main control terminal 29 and the fingerprint sensing IC 20 selects a seed according to the bit sequence and performs displacement to generate an initial. The initial value generated by both the system 231 and the fingerprint sensing IC 20 must be the same. The initial value generator 40 of the system master 29 can be implemented in hardware to avoid the normalized bit sequence format being known and then pushed back to obtain the seed.

The information of the bit sequence includes the number of shifts and the selected seed. Taking a 16-bit bit sequence as an example, the first 2 bits are used to select the seed, and the next 14 bits represent the initial value generator. The number of displacements of 40, in this case, assumes 4 seeds: 16'h5500, 16'h5400, 16'h0020, 16'h0080, and the bit sequence is 16'hC800, where 16' represents 16 bits , h represents the following data is hexadecimal system, so the bit sequence 16'hC800 is represented by 2 digits as 1100100000000000, the first two elements 11 represent the fourth seed 16'h0080, and the last 14 bits represent the displacement 2048 times Therefore, the initial value generator 40 of both the system main control terminal 29 and the fingerprint sensing IC 20 can obtain a consistent initial value by this operation.

6 shows a first embodiment of an initial value generator 40 that includes a plurality of registers G0-G15 and a plurality of mutually exclusive gates, 43, and 47. After selecting one of the seeds 41 from the preset plurality of seeds to be loaded into the initial value generator 40 according to the one-bit sequence, the seed 41 includes a plurality of bit values respectively stored to the registers G0-G15, and then according to the bits. The initial value 231 is generated after the displacement of the number of displacements set by the meta-sequence. The displacement operation of the initial value generator 40 of FIG. 6 is the same as that of the linear feedback shift register 23 of FIG. 4, and the bits of the registers G0-G14 are shifted to the next register G1-G15, mutually exclusive or gated. 43, 45 and 47 generate a new bit value NB0 to the scratchpad G0 according to the current bit values of the partial registers G3, G8, G11 and G14. In other embodiments, the number of registers G0-G15 can be changed, and the number and location of the mutex or gates 43, 45, and 47 can also be changed, and the mutex or gates 43, 45, and 47 can also be used. Replace with other logic circuits

In addition, the number of bits of the initial value 231 can also be set to a preset fixed value, which is not affected by the displacement of the linear feedback shift register 40 to avoid software pushback. Fig. 7 shows a second embodiment of the initial value generator 40. The circuit of Fig. 7 is similar to Fig. 6. The difference is that the bit of the register G15 does not output the last bit as the initial value 231, but is preset. The fixed value "0" is taken as the last bit of the initial value 231. In the embodiment of FIG. 7, only one bit of the initial value 231 is set to a preset fixed value. In other embodiments, more than one bit of the initial value 231 may be set. Is a fixed value for the preset.

In addition to setting a plurality of bits of the initial value 231 to a preset fixed value, the bit values in the partial registers G0-G15 may be operated to generate a specific bit as one of the initial values. 8 shows a third embodiment of the initial value generator 40, which is similar to the circuit of FIG. 6, with the difference that the initial value generator 40 of FIG. 8 does not use the bit of the register G15 as the last bit of the initial value 231. The specific bit Kn generated by mutually exclusive OR operation of the bit values of the registers G3 and G15 using the mutex or gate 49 is taken as the last bit of the initial value 231. The designation of the specific bit Kn can be programmed. For example, this time, the bits of the registers G3 and G15 are specified to generate the specific bit Kn, but when the initial value is generated next time, the registers G2 and G8 can be specified. The bit is used to generate a specific bit Kn. In other embodiments, the mutex or gate 49 may be replaced with other logic operations.

9 shows a fourth embodiment of the initial value generator 40, which is similar to the circuit of FIG. 8, with the difference in the corresponding position of the bits of the registers G0-G3 of FIG. 9 in the initial value 231 being changed, wherein the temporary storage is performed. The bits of the G0-G2 are respectively used as the second, third and fourth bits of the initial value 231, and the bit of the register G3 is taken as the first bit of the initial value 231.

The first fingerprint image information 213 can be divided into a plurality of segments and then encrypted with different initial values 231, which can reduce the possibility that the entire image is illegally decrypted, and can also conform to the linear feedback displacement temporary storage. Limitation of the periodic characteristics of the device. Figure 10 shows a first fingerprint image information 213 having 160 x 160 pixel data, wherein each 10 lines of consecutive pixel data is a segment, each segment using a different initial value 231 resulting in a scrambled value Sn. Encryption, for example, segment 0 uses an initial value of 0, segment 1 uses an initial value of 1, and so on.

FIG. 11 shows another segmentation method of the first fingerprint image information 213, and a diagram thereof The first fingerprint image information 213 of 10 also contains 160×160 pixel data. In this embodiment, the first fingerprint image information 213 is divided into 16 segments and encrypted with different initial values 231, but the segments are encrypted. The number of rows of the pixel data is discontinuous. For example, the 0th segment of the segment 0 acts on the 0th row of the first fingerprint image information 213, and the segment 1 has the first behavior in the first fingerprint image information 213. The 16th row of pixel data, the 2nd row of segment 0 acts as the 32th row of pixel data in the first fingerprint image information 213, and so on. That is, the number of rows of pixel data in the same segment is equidistantly dispersed in the first fingerprint image information 213.

FIG. 12 shows still another method for segmenting the first fingerprint information 213. In this embodiment, 160×160 pixel data of the first fingerprint image information 213 is divided into 16 40×40 segments 0-15. These 16 segments 0-15 are each encrypted using a different scrambling value Sn generated by initial values 0-15, such as segment 0 using an initial value of 0, segment 1 using an initial value of 1, and so on.

The above description of the preferred embodiments of the present invention is intended to be illustrative, and is not intended to limit the scope of the invention to the disclosed embodiments. It is possible to make modifications or variations based on the above teachings or learning from the embodiments of the present invention. The embodiments are described and illustrated in the practical application of the present invention in various embodiments, and the technical idea of the present invention is intended to be equivalent to the scope of the following claims. Decide.

20‧‧‧Fingerprint Sensing IC

21‧‧‧ Fingerprint sensing components

213‧‧‧First fingerprint image information

23‧‧‧Linear feedback shift register

231‧‧‧ initial value

233‧‧‧Disruption value

25‧‧‧Disrupted encryption circuit

253‧‧‧Second fingerprint image information

27‧‧‧Transport interface

29‧‧‧System master

40‧‧‧Initial value generator

Claims (40)

A fingerprint sensing integrated circuit includes: a fingerprint sensing component for sensing a fingerprint and generating a first fingerprint image information; and a linear feedback displacement register for generating a plurality of disturbances according to the input initial value And a scrambling encryption circuit, connected to the linear feedback displacement register and the fingerprint sensing component, using the plurality of scrambling values to scramble the first fingerprint image information to generate an encrypted second fingerprint The image information of the first fingerprint image information is the same as the data amount of the second fingerprint image information, and the fingerprint sensing integrated circuit transmits the second fingerprint image information to the second fingerprint image information via a transmission interface to A remote control system performs fingerprint authentication. The fingerprint sensing integrated circuit of claim 1, wherein the first fingerprint image information comprises a plurality of first pixel data, and the second fingerprint image information comprises a plurality of second pixel data, wherein the plurality of scrambling values are respectively The plurality of first pixel data are scrambled to generate the plurality of second pixel data. The fingerprint sensing integrated circuit of claim 1, wherein the scrambling encryption circuit comprises a mutual exclusion or gate. The fingerprint sensing integrated circuit of claim 1, wherein the initial value is provided by the system main control terminal, or is provided by the fingerprint sensing integrated circuit, or the system controller and the fingerprint sense The quadrature circuit is calculated by the operation of the circuit. The fingerprint sensing integrated circuit of claim 1 further includes an initial value generator for generating the initial value. The fingerprint sensing integrated circuit of claim 5, wherein the initial value generator includes another linear feedback shift register for generating the initial value. The fingerprint sensing integrated circuit of claim 5, wherein the initial value generator selects one of the plurality of preset seeds according to the one-bit sequence, and determines the displacement according to the sequence of the bit. The pair of selected seeds are displaced to produce the initial value. The fingerprint sensing integrated circuit of claim 7, wherein the bit sequence is provided by the fingerprint sensing integrated circuit, or provided by the system controller, or the system controller and the fingerprint sense The integration of the body circuit is generated. The fingerprint sensing integrated circuit of claim 5, wherein the initial value is composed of a plurality of bits, and a part of the plurality of bits is a preset fixed value. The fingerprint sensing integrated circuit of claim 5, wherein the initial value generator comprises a plurality of registers, wherein the bit values stored by at least two of the registers are logically operated as one of the initial values. yuan. The fingerprint sensing integrated circuit of claim 5, wherein the initial value generator comprises a temporary register, and the bit value stored by the temporary register is one of the initial values. The fingerprint sensing integrated circuit of claim 1, wherein the first fingerprint image information is divided into a plurality of segments, and the plurality of segments are respectively scrambled and encrypted according to the plurality of scrambled values generated by the different initial values. The second fingerprint image information is generated. A method for scrambling encryption of a fingerprint sensing integrated circuit, wherein the fingerprint sensing integrated circuit is connected to a system main control terminal via a transmission interface, the scrambling encryption method comprising the steps of: sensing a fingerprint to generate a first fingerprint image information Generating a plurality of scrambling values by using an initial value; and scrambling and encrypting the first fingerprint image information by using the plurality of scrambling values to generate an encrypted second fingerprint image information to be transmitted to the system master through the transmission interface Fingerprint authentication; The data amount of the first fingerprint image information is the same as the data amount of the second fingerprint image information. The scrambling encryption method of claim 13, wherein the step of scrambling and encrypting the first fingerprint image information by using the plurality of scrambling values comprises separately using the plurality of scrambling values to respectively perform the first fingerprint image information The one pixel data is scrambled to generate a plurality of second pixel data, wherein the plurality of second pixel data constitute the second fingerprint image information. The scrambling encryption method of claim 13, wherein the step of scrambling and encrypting the first fingerprint image information by using the plurality of scrambling values comprises performing scrambling encryption using a mutual exclusion or operation. The scrambling encryption method of claim 13, further comprising providing the initial value by the system host, or providing the initial value by the fingerprint sensing integrated circuit, or sensing by the system host and the fingerprint The integrated circuit agreement operation produces the initial value. The scrambling encryption method of claim 13, further comprising: selecting one of the plurality of preset seeds by a one-bit sequence, and displacing the selected seed according to the number of displacements determined by the sequence of the bit to generate The initial value, wherein the bit sequence is provided by the fingerprint sensing integrated circuit, or provided by the system host, or is generated by the system master and the fingerprint sensing integrated circuit. The scrambling encryption method of claim 17, further comprising providing the initial value using an initial value generator including a linear feedback shift register. The scrambling encryption method of claim 18 further includes setting a part of the bit of the initial value to a preset fixed value. For example, the scrambling encryption method of claim 18 further includes logically calculating a bit value stored in at least two of the initial value generators as one of the initial values. The scrambling encryption method of claim 18, further comprising using the bit value stored in a register in the initial value generator as one of the initial values. The scrambling encryption method of claim 13, wherein the step of scrambling and encrypting the first fingerprint image information by using the plurality of initial values comprises dividing the first fingerprint image information into a plurality of segments respectively different from the The plurality of scrambled values generated by the initial value are scrambled and encrypted. A fingerprint sensing integrated circuit includes: a fingerprint sensing component for sensing a fingerprint and generating a first fingerprint image information, wherein the first fingerprint image information is divided into a plurality of segments, each segment comprising a plurality of segments a first pixel data; a linear feedback displacement register, generating a plurality of scrambling values according to initial values corresponding to the segments to be currently encrypted; and a scrambling encryption circuit connecting the linear feedback displacement register and the a fingerprint sensing component, using the plurality of scrambling values, scrambling and encrypting a plurality of first pixel data of the segment to be currently encrypted to generate a plurality of second pixel data; wherein the plurality of segments are all scrambled and encrypted The generated second pixel data constitutes a second fingerprint image information, the data amount of the first fingerprint image information is the same as the data amount of the second fingerprint image information, and the fingerprint sensing integrated circuit The second fingerprint image information is transmitted to a remote system controller through a transmission interface for fingerprint authentication. The fingerprint sensing integrated circuit of claim 23, wherein the scrambling encryption circuit comprises a mutex or a gate. The fingerprint sensing integrated circuit of claim 23, wherein the initial value is provided by the system main control terminal, or is provided by the fingerprint sensing integrated circuit, or the system controller and the fingerprint sense The quadrature circuit is calculated by the operation of the circuit. The fingerprint sensing integrated circuit of claim 23 further includes an initial value generator for generating the initial value. The fingerprint sensing integrated circuit of claim 26, wherein the initial value generator includes another linear feedback shift register for generating the initial value. The fingerprint sensing integrated circuit of claim 26, wherein the initial value generator selects one of the plurality of preset seeds according to the one-bit sequence, and selects according to the number of displacements determined by the sequence of the bit The seeds are displaced to produce the initial value. The fingerprint sensing integrated circuit of claim 28, wherein the bit sequence is provided by the fingerprint sensing integrated circuit, or provided by the system controller, or by the system controller and the fingerprint sense The integration of the body circuit is generated. The fingerprint sensing integrated circuit of claim 26, wherein the initial value is composed of a plurality of bits, and a part of the plurality of bits is a preset fixed value. The fingerprint sensing integrated circuit of claim 26, wherein the initial value generator comprises a plurality of registers, wherein the bit values stored by at least two of the registers are logically operated as one of the initial values yuan. The fingerprint sensing integrated circuit of claim 26, wherein the initial value generator comprises a temporary register, and the bit value stored by the temporary register is one of the initial values. A method for scrambling encryption of a fingerprint sensing integrated circuit, wherein the fingerprint sensing integrated circuit is connected to a system main control terminal via a transmission interface, the scrambling encryption method comprising the steps of: sensing a fingerprint to generate a first fingerprint image information Dividing the first fingerprint image information into a plurality of segments, each segment comprising a plurality of first pixel data; Providing an initial value according to the segment currently to be encrypted; generating a plurality of scrambling values by using the initial value; and performing scrambling encryption on the plurality of first pixel data of the segment to be currently encrypted by using the plurality of scrambling values to generate Encrypting a plurality of second pixel data; wherein all the second pixel data generated by the plurality of segments are scrambled and encrypted to form a second fingerprint image information, and the data amount of the first fingerprint image information The data amount of the second fingerprint image information is the same, and the second fingerprint image information is transmitted to the system control terminal for fingerprint authentication via the transmission interface. The scrambling encryption method of claim 33, wherein the step of scrambling the plurality of first pixel data of the segment to be currently encrypted using the plurality of scrambling values comprises performing scrambling encryption using a mutual exclusion or operation. The scrambling encryption method of claim 33 further includes providing the initial value by the system host, or providing the initial value by the fingerprint sensing integrated circuit, or sensing by the system host and the fingerprint. The integrated circuit agreement operation produces the initial value. The scrambling encryption method of claim 33, further comprising: selecting one of the plurality of preset seeds by a bit sequence, and displacing the selected seed according to the number of shifts determined by the bit sequence The initial value is generated, wherein the bit sequence is provided by the fingerprint sensing integrated circuit, or is provided by the system host, or is generated by the system master and the fingerprint sensing integrated circuit. The scrambling encryption method of claim 36 further includes providing the initial value using an initial value generator including a linear feedback shift register. The scrambling encryption method of claim 37, further comprising setting a part of the bit of the initial value as a pre- Set a fixed value. The scrambling encryption method of claim 37, further comprising logically calculating a bit value stored in at least two of the initial value generators as one of the initial values. The scrambling encryption method of claim 37, further comprising using the bit value stored in a register in the initial value generator as one of the initial values.