Audio signal encryption method, device, electronic device, and storage medium

Abstract

The present invention proposes an audio signal encryption method, device, electronic device, and storage medium. The method specifically includes: converting a key seed into an encryption matrix based on a preset coding rule and a chaotic matrix, and dividing the encryption matrix into multiple key vectors; an audio signal encryption module obtaining an original audio signal and dividing the original audio signal into multiple original audio vectors; an audio signal encryption module scrambling all original audio vectors to obtain multiple scrambled audio vectors, obtaining an audio identifier and a first vector from each scrambled audio vector, and encrypting the first vector based on the key vector; synthesizing all corresponding scrambled audio vectors and the first vector based on the audio identifier to obtain multiple encrypted audio vectors, and generating an encrypted audio signal based on the encrypted audio vectors. The method provided by the present invention can perform encryption with fewer resources during encryption, reducing the time required to encrypt an audio signal.

Description

Technical Field

[0001] The present invention relates to the technical field of audio signal encryption, and in particular to an audio signal encryption method, device, electronic device, and storage medium. Background Art

[0002] With the rapid development of modern computing and social media technologies, and the advent of the big data era, massive amounts of multimedia data are continuously output daily, including audio data. During the transmission of this audio data, there is a possibility of interception by other devices. If the audio data contains important private information, the leakage of such audio data can have serious consequences. Therefore, audio encryption algorithms have become a hot topic of research. For a security system, key space estimation is a fundamental tool for evaluating the effectiveness of the security system. A successful encryption system must have a large key space and be sensitive to the key value. Currently, algorithms based on chaotic systems are particularly popular in the field of encryption. There are two types of chaotic systems: one-dimensional (1D) chaotic systems and high-dimensional (HD) chaotic systems. Existing 1D chaotic systems are mainly used for information data encryption. However, encryption systems using only 1D chaotic systems have a small key space and low decryption difficulty. On the other hand, the high dimensionality of HD chaotic systems consumes excessive system resources during encryption and decryption, resulting in a long duration of the encrypted audio signal. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an audio signal encryption method, device, electronic device, and storage medium, which can provide an encryption transmission method with a large key space and consumes less resources.

[0004] In a first aspect, an embodiment of the present invention provides an audio signal encryption method, which is applied to an audio signal processing system, the system including a transmitting end and a receiving end, and the encryption transmission method including:

[0005] The audio signal encryption module obtains a key seed, converts the key seed into an encryption matrix based on a preset encoding rule and a chaotic matrix, and divides the encryption matrix into a plurality of key vectors, wherein the chaotic matrix is ​​generated based on a sine map, an extended logistic map, and a Hénon map;

[0006] The audio signal encryption module obtains an original audio signal and divides the original audio signal into a plurality of original audio vectors;

[0007] The audio signal encryption module scrambles all the original audio vectors to obtain multiple scrambled audio vectors, obtains an audio flag and a first vector from each of the scrambled audio vectors, and encrypts the first vectors based on the key vector, wherein one first vector corresponds to one key vector;

[0008] The audio signal encryption module resynthesizes all corresponding scrambled audio vectors with the first vector based on the audio flag to obtain multiple encrypted audio vectors, and generates an encrypted audio signal based on the encrypted audio vectors.

[0009] In some embodiments of the present invention, the audio signal encryption module obtains a key seed and converts the key seed into an encryption matrix based on a preset encoding rule and a chaotic matrix, including:

[0010] Taking each character in the key seed as a vertex and connecting every two vertices with an edge to generate a path graph, and encoding all characters in the path graph based on the encoding rule;

[0011] Obtaining an adjacency matrix by calculation based on the encoded path graph, wherein the dimension of the adjacency matrix is ​​equal to the length of the character string of the key seed;

[0012] Generate a plurality of random integer values ​​based on a sine map, process all the integer values ​​sequentially through an extended logistic map and a Hénon map to obtain a plurality of independent values, and generate a chaotic vector based on the independent values;

[0013] Converting the chaotic vector into the chaotic matrix, wherein the dimension of the chaotic matrix is ​​equal to the string length of the key seed;

[0014] The encoding matrix and the chaotic matrix are multiplied together, and the matrix obtained by the multiplication is further multiplied by the lower triangular matrix that has been rotated once to obtain the encryption matrix.

[0015] In some embodiments of the present invention, the audio signal encryption module scrambles all the original audio vectors to obtain a plurality of scrambled audio vectors, including:

[0016] Divide the original audio signal into a plurality of first value blocks, wherein each of the first value blocks includes N characters, where N is a positive integer;

[0017] generating an index key based on a quantum logistic chaotic map, wherein the index key includes a plurality of samples, and the number of the samples is equal to the number of the characters of the first value block;

[0018] reordering the position of each character in each first value block based on the order of the samples in the index key to obtain a plurality of primary scrambling vectors;

[0019] A primary scrambled audio is generated based on all the primary scrambling vectors.

[0020] In some embodiments of the present invention, the audio signal encryption module scrambles all of the original audio vectors to obtain a plurality of scrambled audio vectors, further comprising:

[0021] Dividing the primary scrambled audio into a plurality of second value blocks, wherein each second value block includes 2N characters, where N is a positive integer;

[0022] converting all the second value blocks from a floating point format to a binary format, and converting a first preset number segment in each of the second value blocks into a DNA sequence, wherein the first preset number segment is composed of a continuous segment of characters in the second value block;

[0023] After the conversion is completed, all the second data blocks are restored to a floating point format, and the scrambled audio signal is generated based on all the second value blocks.

[0024] In some embodiments of the present invention, obtaining an audio marker and a first vector from each of the scrambled audio vectors, and encrypting the first vector based on the key vector, includes:

[0025] converting all numerical values ​​constituting the scrambled audio vector from a floating point format to a binary format, generating the audio marker based on a second preset number segment in the scrambled audio vector, and segmenting the first vector based on a third preset number segment in the scrambled audio vector, wherein the second preset number segment and the third preset number segment are both composed of a continuous segment of characters in the scrambled audio vector, and the second preset number segment and the third preset number segment are adjacent to each other;

[0026] An exclusive OR operation is performed on each of the first vectors and each of the key vectors to generate a plurality of second vectors, wherein an exclusive OR operation is performed on one of the first vectors and one of the key vectors.

[0027] In some embodiments of the present invention, the step of resynthesizing all corresponding scrambled audio vectors with the first vector based on the audio flag to obtain a plurality of encrypted audio vectors includes:

[0028] converting all the second vectors into third value blocks, and re-adding each of the third value blocks to the scrambled audio vector based on the audio flag to obtain a plurality of the encrypted audio vectors, wherein the positions of the third value blocks are the same as the positions of the third preset number segments;

[0029] All numerical values ​​constituting the scrambled audio vector are converted from binary format to floating point format.

[0030] In some embodiments of the present invention, the audio signal processing system further includes an audio signal decryption module, the audio signal decryption module being communicatively connected to the audio signal encryption module. After the audio signal encryption module generates an encrypted audio signal based on the encrypted audio vector, the method further includes:

[0031] The audio signal encryption module sends the encrypted audio signal to the audio signal decryption module;

[0032] The audio signal decryption module converts all the second vectors in the encrypted audio vector into the first vector based on the encrypted audio vector, the audio flag and the key vector to obtain the scrambled audio signal;

[0033] The audio signal decryption module performs descrambling processing on the scrambled audio signal to obtain the original audio signal.

[0034] In a second aspect, an embodiment of the present invention provides a control device comprising at least one control processor and a memory for communicating with the at least one control processor; the memory stores instructions executable by the at least one control processor, and the instructions are executed by the at least one control processor so that the at least one control processor can execute the audio signal encryption method described in the first aspect above.

[0035] In a third aspect, an embodiment of the present invention provides an electronic device comprising the control device as described in the second aspect above.

[0036] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the audio signal encryption method as described in the first aspect above.

[0037] The audio signal encryption method according to an embodiment of the present invention has at least the following beneficial effects: the audio signal encryption module obtains a key seed, converts the key seed into an encryption matrix based on a preset encoding rule and a chaotic matrix, and divides the encryption matrix into multiple key vectors, wherein the chaotic matrix is ​​generated based on a sine map, an extended logistic map, and a Hénon map; the audio signal encryption module obtains an original audio signal and divides the original audio signal into multiple original audio vectors; the audio signal encryption module scrambles all the original audio vectors to obtain multiple scrambled audio vectors, obtains an audio identifier and a first vector from each scrambled audio vector, and encrypts the first vector based on the key vector, wherein each first vector corresponds to a key vector; the audio signal encryption module resynthesizes all corresponding scrambled audio vectors with the first vector based on the audio identifier to obtain multiple encrypted audio vectors, and generates an encrypted audio signal based on the encrypted audio vector. The technical solution according to the embodiment of the present invention combines multiple low-dimensional chaotic mapping methods and scrambling methods, can encrypt with fewer resources during encryption, and can also obtain a sufficiently large key space, taking into account the performance and security of the system during encrypted transmission, and reducing the time required to encrypt the audio signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is one of the flow charts of the audio signal encryption method provided by one embodiment of the present invention;

[0039] Figure 2 This is a second flowchart of a method for encrypting an audio signal provided by an embodiment of the present invention;

[0040] Figure 3 It is a structural diagram of a control device provided by another embodiment of the present invention. DETAILED DESCRIPTION

[0041] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0042] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0043] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0044] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0045] An embodiment of the present invention provides an audio signal encryption method having at least the following beneficial effects: an audio signal encryption module obtains a key seed, converts the key seed into an encryption matrix based on a preset encoding rule and a chaotic matrix, and divides the encryption matrix into multiple key vectors, wherein the chaotic matrix is ​​generated based on a sine map, an extended logistic map, and a Hénon map; an audio signal encryption module obtains an original audio signal and divides the original audio signal into multiple original audio vectors; the audio signal encryption module scrambles all original audio vectors to obtain multiple scrambled audio vectors, obtains an audio identifier and a first vector from each scrambled audio vector, and encrypts the first vector based on the key vector, wherein each first vector corresponds to a key vector; the audio signal encryption module resynthesizes all corresponding scrambled audio vectors with the first vector based on the audio identifier to obtain multiple encrypted audio vectors, and generates an encrypted audio signal based on the encrypted audio vector. According to the technical solution of the embodiment of the present invention, multiple low-dimensional chaotic mapping methods and scrambling methods are combined, which can be used for encryption with fewer resources, while obtaining a sufficiently large key space, taking into account the performance and security of the system during encrypted transmission, and reducing the time required to encrypt the audio signal.

[0046] The concepts of the present invention are explained below:

[0047] Chaotic mapping: It is divided into 1D chaotic mapping and HD chaotic mapping. 1D chaotic mapping contains a small number of factors, while HD chaotic mapping contains a large number of factors;

[0048] Chaos matrices: matrices used in chaos theory that have the property of being very sensitive to initial values, meaning that small changes in initial conditions can lead to large differences in long-term behavior.

[0049] DNA encoding: This is dynamically established based on the chaotic sequence being created. DNA contains four basic nucleotides: A, T, C, and G, with pairings permitted only between A and T, and between C and G. In a grayscale image, each pixel is represented by an 8-bit binary number, and complementary relationships exist between multiple pairs of binary values. Since 00 is related to 11, and 01 to 10, the digital pairs 00, 01, 10, and 11 can be used to encode the complementary DNA bases A, C, G, and T.

[0050] Graph theory studies the mathematical structure and properties of graphs. A graph is a set of vertices (or nodes) connected by edges. Graph theory has a wide range of applications in computer science, cryptography, network analysis, biology, social sciences, transportation planning, and other fields.

[0051] The control method of the embodiment of the present invention is further described below based on the accompanying drawings;

[0052] Reference Figure 1 , Figure 1 This is a flowchart of an audio signal encryption method provided by an embodiment of the present invention. The audio signal encryption method is applied to an audio signal processing system. The system includes a transmitting end and a receiving end. The encryption transmission method includes but is not limited to the following steps:

[0053] Step S100: The audio signal encryption module obtains a key seed, converts the key seed into an encryption matrix based on a preset encoding rule and a chaotic matrix, and divides the encryption matrix into multiple key vectors, wherein the chaotic matrix is ​​generated based on a sine map, an extended logistic map, and a Hénon map;

[0054] Step S200: The audio signal encryption module obtains an original audio signal and divides the original audio signal into a plurality of original audio vectors;

[0055] Step S300: The audio signal encryption module scrambles all original audio vectors to obtain multiple scrambled audio vectors, obtains an audio identifier and a first vector from each scrambled audio vector, and encrypts the first vector based on the key vector, wherein each first vector corresponds to one key vector.

[0056] In step S400 , the audio signal encryption module resynthesizes all corresponding scrambled audio vectors with the first vector based on the audio flag to obtain multiple encrypted audio vectors, and generates an encrypted audio signal based on the encrypted audio vectors.

[0057] It should be noted that in step S100, the key seed is a string of multiple characters, and the characters of the string can be generated based on any preset rules, and the length of the string can also be arbitrarily set according to needs. Since the key seed is composed of a string of characters, the vector form corresponding to the key seed can be obtained by converting each character in the string into a vector factor. Furthermore, since the characters in the vector form corresponding to the key seed can be arbitrarily limited, it is necessary to convert all characters into numerical values ​​generated based on the same set of encoding rules before the numerical values ​​can be converted. Step S100 also involves a chaotic matrix generated by three types of mappings. The chaotic matrix is ​​generated based on the sine map, the extended logistic map and the Hénon map. The dimensions of these three types of chaotic maps are all low, the sine map is 1D, and the extended logistic map and the Hénon map are both 2D. Combining these three chaotic maps with low dimensions can obtain a larger key space while occupying fewer resources.

[0058] It should be noted that in steps S200 to S300, the audio signal encryption module first divides the original audio signal into multiple original audio vectors and then sequentially scrambles the original audio signal based on a quantum logistic chaotic map and DNA encoding. The quantum logistic chaotic map employed is based on a quantum particle system that exhibits unpredictable dynamical behavior within a specific range. In classical chaotic maps, the key space is limited due to the minimal number of control factors, resulting in a narrow chaotic length. When using chaotic maps with more dimensions, as described in the solution provided herein, the key space becomes larger, and the complexity, randomness, and sensitivity to the initial state and control factors all increase. Therefore, the quantum logistic system is suitable for use as a seed system in cryptographic methods. To increase the difficulty for hackers to reconstruct the original speech, a 3D quantum logistic chaotic map is used to scramble the original audio signal in the initial step. Furthermore, while the original audio signal is scrambled by the quantum logistic chaotic map, it is also scrambled again by DNA encoding, further increasing the complexity of the cryptographic system and making it more difficult for hackers to crack it, while also not consuming excessive system resources.

[0059] It should be noted that after the key vector and the scrambled audio vector are generated based on the above-mentioned embodiments, the two need to be combined to realize the encryption of the original audio signal. Specifically, in step S400, part of the code in the scrambled audio vector is separated out, and after associating with the key vector and performing related processing operations, the processed vector is backfilled into the key vector to realize the association between the key and the audio.

[0060] It can be understood that the audio signal encryption transmission method provided by the above-mentioned embodiments of the present invention, based on the key vector converted from the chaotic matrix constructed based on multiple chaotic maps, can improve the complexity of the encryption algorithm in the encryption system while occupying fewer resources, obtain a larger key space, and meet the needs of audio signal encryption transmission; at the same time, by performing an appropriate number of (secondary) scrambling on the audio signal, the complexity of the encryption algorithm is further improved, so that the audio signal can be transmitted more securely.

[0061] In addition, in one embodiment, Figure 1 Step S100 in the illustrated embodiment also includes but is not limited to the following steps:

[0062] Step S110, taking each character in the key seed as a vertex and connecting every two vertices with an edge to generate a path graph, and encoding all characters in the path graph based on the encoding rule;

[0063] Step S120, calculating and obtaining an adjacency matrix based on the encoded path graph, wherein the dimension of the adjacency matrix is ​​equal to the length of the key seed string;

[0064] Step S130, generating a plurality of random integer values ​​based on a sine map, processing all the integer values ​​sequentially through an extended logistic map and a Hénon map to obtain a plurality of independent values, and generating a chaotic vector based on the independent values;

[0065] Step S140, converting the chaotic vector into a chaotic matrix, wherein the dimension of the chaotic matrix is ​​equal to the length of the key seed string;

[0066] In step S150, the encoding matrix and the chaotic matrix are multiplied together, and the matrix obtained by the multiplication is further multiplied by the lower triangular matrix that has undergone one rotation to obtain an encryption matrix.

[0067] It should be noted that in steps S110 to S150, the key seed is first processed based on the processing ideas of graph theory. The graph consists of ordered pairs (V, E), where V represents the vertices of the graph and E represents its edges. Therefore, a graph is simply a set of vertices and edges. In an embodiment of the present invention, the graph G(A) = (V, E) consists of vertices V and edges E. After the path graph is generated, before the path graph is processed by the chaotic map, it is necessary to convert the characters in the path graph into numerical characters according to the encoding rules to facilitate subsequent vector operations. After obtaining the adjacency evidence of the corresponding path graph, the independent values ​​generated by the sine map, extended logistic map, and Hénon map are used to generate a chaotic matrix. After multiplying the encoding matrix and the chaotic matrix, the matrix obtained by multiplication is then multiplied with the lower triangular matrix that has undergone a single rotation to obtain the encryption matrix. It can be understood that the rotation operation of the lower triangular matrix that has undergone a single rotation introduces a nonlinear transformation, which further increases the complexity of the key generation process.

[0068] Exemplarily, the encoding rules are shown in Table 1, based on which the characters involved in the key seed in the above-mentioned embodiment are converted into numerical values ​​that can be used for vector operations:

[0069]

[0070]

[0071] Table 1

[0072] Exemplarily, in one embodiment of the present invention, the cryptographic key is: Finally, we encode based on Table 1 and get the key vector [35,39,22,40,27,27,126,59,76,70,27,27,96,91,111,130,93,27,27,91,110,92,67,101,93,27,27,19,19,19,19,17].

[0073] For example, the embodiment of the present invention uses a 1D sine map, which is a variation of the sine function that converts the input from [0, π] to [0, 1] while maintaining the original output range of [0, 1]. The process can be expressed as:

[0074] Si(t+1)=Q×[sin(π×Si(t))]······(1)

[0075] Where Q represents a control parameter. Since the 1D sinusoidal mapping includes fewer variables, the efficiency of the 1D sinusoidal mapping can be twice that of the HD chaotic mapping, thereby increasing the speed of the voice encryption process.

[0076] Furthermore, the extended logistic map can be extended from two dimensions using the following equations (2) and (3):

[0077] Ai(t+1)=ε1×Ai(t)×(1-Ai(t))+σ1×Bi(t) 2 ······(2)

[0078] Bi(t+1)=ε2×Bi(t)×(1-Bi(t))+σ2×(Bi(t) 2 +Ai(t)×Bi(t))······(3)

[0079] This mapping exhibits chaotic behavior when the variables satisfy the following conditions: 2.75 < ε1 < 3.4, 2.7 < ε2 < 3.45, 0.15 < σ1 < 0.21, and 0.13 < σ2 < 0.15. The values ​​of Ai(0) and Bi(0) are in the range [0, 1]. In this embodiment of the present invention, an encryption method based on a 2D extended logistic map is employed. By using a 2D extended logistic map to increase the total number of variables and the complexity of the logistic map architecture, the encoding level can be improved.

[0080] Furthermore, the Hénon chaotic mapping in the embodiment of the present invention is a two-dimensional mapping analysis method. It can be derived by the following formulas (4) and (5):

[0081]

[0082] Di(t+1)=Ci(t)······(5)

[0083] Two variables: θ, which determines the degree of stretching, and Used to adjust the thickness of the fold. In practice, when θ = 1.4 and The Hénon function exhibits chaotic behavior when . These two variables are provided as strange attractors and are initial parameters, and the initial position is (C(0), D(0)). This method will be able to map every point in the image (C(t), D(t))) to a new point.

[0084] In addition, in one embodiment, Figure 1 Step S300 in the illustrated embodiment also includes but is not limited to the following steps:

[0085] Step S310: dividing the original audio signal into a plurality of first value blocks, wherein each first value block includes N characters, where N is a positive integer;

[0086] Step S320: generating an index key based on a quantum logistic chaotic map, wherein the index key includes a plurality of samples, and the number of the samples is equal to the number of characters in the first value block;

[0087] Step S330: reorder the position of each character in each first value block based on the order of samples in the index key to obtain multiple primary scrambling vectors;

[0088] Step S340: Generate primary scrambled audio based on all primary scrambling vectors.

[0089] It should be noted that steps S310 to S340 are the first scrambling of the original audio signal based on the quantum logistic chaotic map. In this embodiment of the present invention, the first numerical block is to divide the original audio signal into multiple blocks of equal length, each block consisting of multiple numerical characters. The quantum logistic map generates a key, which can be defined as follows:

[0090] A(n+1)=μ×(A(n)-|A(N)| 2 )-μ×B(n)······(6)

[0091] B(n+1)=-B(n)×e -2γ +e -γ ×η[(2-A(n)-A(n) * )×B(n)-A(n)×C(n) * -A(n)*C(n)]····(7)

[0092] C(n+1)=-C(n)×e -2γ +e -γ ×μ[(2(1-A(n) * )×C(n)-2×A(n)×B(n)-A(n)]····(8)

[0093] Where γ represents the dissipation parameter, c represents the control parameter, and the initial conditions (A(n), B(n), C(n)) are set to real numbers to meet the interaction criteria. After the index key is generated based on equations (5), (6), and (7), since the characters in the index key have a certain order, the numbers in the first numerical block can be reordered according to the order to obtain a scrambling vector, and scrambled audio is generated based on the scrambling vector.

[0094] In addition, in one embodiment, Figure 1 In step S300 of the illustrated embodiment, the following steps are also included but not limited to step S350: dividing the primary scrambled audio into a plurality of second value blocks, wherein each second value block includes 2N characters, where N is a positive integer;

[0095] Step S360: Convert all second value blocks from floating point format to binary format, and convert the first preset number segment in each second value block into a DNA sequence, wherein the first preset number segment is composed of a continuous segment of characters in the second value block;

[0096] Step S370: After the conversion is completed, all second data blocks are restored to a floating point format, and a scrambled audio signal is generated based on all second value blocks.

[0097] It should be noted that steps S250 to S270 are a second scrambling of the original audio signal based on a dynamic DNA sequence. In an embodiment of the present invention, the second numerical block is a process of dividing the first scrambled signal into multiple blocks of equal length, each consisting of multiple numerical characters. Since a dynamic DNA sequence is used for encoding, the number of numerical characters in the second data block is twice the number of numerical characters in the first numerical block. For example, there are four basic nucleotides in DNA, namely A, T, C, and G, where only A and T and C and G are allowed to pair. Therefore, when the principle of DNA sequences is applied to cryptographic encoding, since the DNA encoding process requires that the numerical characters be organized into a data structure similar to base pairs, this encoding scheme has a total of 24 different versions, but the programs must follow a pairing standard. The pairing standard stipulates that the A base must pair with T and the C base must pair with G. Therefore, only eight different types of programs are valid. The specific corresponding relationships are detailed in Table 2.

[0098]

[0099] Table 2

[0100] The dynamic DNA sequence used in the second stage of scrambling the voice file depends on the bases A, G, T and C, which form many of the rules listed in Table 2. This approach means that recovering the voice sample will be more difficult, which can effectively prevent the encrypted audio from being cracked by others.

[0101] In addition, in one embodiment, Figure 1 Step S400 in the illustrated embodiment also includes but is not limited to the following steps:

[0102] Step S410: converting all values ​​constituting the scrambled audio vector from floating point format to binary format, generating an audio marker based on a second preset number segment in the scrambled audio vector, and segmenting the first vector based on a third preset number segment in the scrambled audio vector, wherein the second preset number segment and the third preset number segment are both composed of a continuous segment of characters in the scrambled audio vector, and the second preset number segment and the third preset number segment are adjacent to each other;

[0103] Step S420 , performing an XOR operation on each first vector and each key vector to generate multiple second vectors, wherein an XOR operation is performed on one first vector and one key vector.

[0104] It should be noted that in steps S410 to S420, in order to encrypt the scrambled audio vector, the key vector of the above-mentioned embodiment needs to be associated with the scrambled audio vector through an exclusive-or operation. In this embodiment of the present invention, each value in the scrambled audio vector is first converted from floating-point format to binary. The 1st to 8th bits of each scrambled audio vector, i.e., the second preset number segment, are separated and these bits are saved as flag values ​​to be used as corresponding key flags for each second numerical block based on the scrambled audio signal. Furthermore, the 9th to 24th bits of each scrambled audio signal, i.e., the third preset number segment, are separated and stored in a binary vector. Finally, the vector of the separated third preset number segment is exclusive-ored with the key vector to complete the association. It is understandable that the second preset number segment and the third preset number segment are not limited to the 1st to 8th bits and the 9th to 24th bits, and can be in any position. The floating-point numerical characters are converted to binary format to facilitate the exclusive-or operation between the vectors.

[0105] In addition, in one embodiment, Figure 1 Step S400 in the illustrated embodiment also includes but is not limited to the following steps:

[0106] Step S430: Convert all second vectors into third value blocks, and add each third value block to the scrambled audio vector based on the audio flag to obtain multiple encrypted audio vectors, wherein the position of the third value block is the same as the position of the third preset number segment;

[0107] Step S440: convert all the numerical values ​​constituting the scrambled audio vector from binary format to floating point format.

[0108] It should be noted that in steps S430 to S440, in the above-described embodiments, after the third preset numerical segment is combined with the key vector, the combined vector needs to be re-merged into the scrambled audio vector. At this time, based on the correspondence between the audio flag and the scrambled audio vector, the third numerical block needs to be re-added to the scrambled audio vector to generate the encrypted audio vector. Finally, the binary numerical characters in the scrambled audio vector are converted back to floating-point format, completing the entire encryption process.

[0109] In addition, in one embodiment, the audio signal processing system provided by the present invention further includes an audio signal decryption module, which is communicatively connected to the audio signal encryption module. After the audio signal encryption module generates an encrypted audio signal based on the encrypted audio vector, the audio signal encryption method further includes but is not limited to the following steps:

[0110] Step S510: the audio signal encryption module sends the encrypted audio signal to the audio signal decryption module;

[0111] Step S520: The audio signal decryption module converts all second vectors in the encrypted audio vector into first vectors based on the encrypted audio vector, the audio flag, and the key vector to obtain a scrambled audio signal.

[0112] Step S530: The audio signal decryption module descrambles the scrambled audio signal to obtain the original audio signal.

[0113] It should be noted that in steps S510 to S530, after the receiving end obtains the encrypted audio signal, it needs to reversely execute the encryption method of the embodiment of the above aspect for decryption, specifically including dividing the encrypted audio signal into multiple encrypted audio vectors, then converting the numerical characters of the encrypted audio vector into binary format, dividing the 1st to 8th bits as the flag bit, dividing the 9th to 24th bits, and performing the corresponding vector XOR operation based on the 9th to 24th bits and re-merging the result with the flag bit to obtain the scrambled audio signal, and then performing two descrambling operations to obtain the original audio signal. It can be understood that the embodiment of the present invention can also improve the security of audio data transmission by transmitting the key seed and the encrypted audio in batches, preventing the key and the encrypted audio from being intercepted at the same time.

[0114] The following is a specific embodiment of the present invention:

[0115] Reference Figure 2 , first generate a key based on the key seed. The specific steps include:

[0116] 1- Enter the seed for the cryptographic key, which is 32 characters long.

[0117] 2- Treat each character in the password as a vertex, and connect every two vertices with an edge to form a path graph.

[0118] 3- Encode the password characters using the encoding method in Table 3.

[0119] 4- Calculate the adjacency matrix A of dimension 32×32.

[0120] 5-Generate a lower triangular matrix C of dimension 32×32.

[0121] 6- Generate 1024 random integer values ​​using a multi-chaotic map based on a 1D sine map, a 2D extended logistic map, and a 2D Hénon map, and store these random integer values ​​in a vector V. The specific steps are as follows:

[0122] a- Repeat the sinusoidal mapping process in formula (1) until a total of 1024 non-repeating items are generated.

[0123] b- Pass the result of the previous step as input to the extended logistic map in formula (2) to generate 1024 independent values.

[0124] c- Process the result of step (b) using the Hénon mapping process of formula (3) to obtain 1024 independent values.

[0125] d- Store the result of step (c) in vector V as an integer value.

[0126] 7- Convert the vector V into a two-dimensional matrix B containing 32×32 values.

[0127] 8- Multiply matrices A and B, and then multiply the result with the rotated matrix C. The resulting matrix D is then randomly divided into 16 vectors to be used as the encryption key.

[0128] 9-Convert the encryption key matrix into an encryption key vector Ek.

[0129] After the key is generated, the input voice signal is scrambled in two steps: in the first step, the decimal format voice samples are mixed using quantum logistic mapping, and in the second step, the binary format samples are shuffled using dynamic DNA coding. The scrambling process is described as follows:

[0130] 1. Scrambling based on quantum logistic mapping: Receive an original speech signal in .WAV format; divide the original speech signal into multiple blocks of 128 values; use a quantum logistic chaotic map to generate an index key for each block. The index key IK consists of N samples. MK(k), where k = 1, 2, ..., 128; shuffle the values ​​at each position in each block based on the index key IK generated by the quantum logistic chaotic map; combine the results from all blocks into a single signal for the next scrambling process.

[0131] 2. Scrambling based on dynamic DNA coding: Read the input scrambled speech signal in .WAV format; divide the original speech signal into multiple blocks (each block contains 256 values); convert the sampled speech signal in each block from floating point format to binary format with 64 bits; use dynamic DNA coding to convert bits 9-24 in the binary format into a DNA sequence based on the block index, as described in Table 2; after completing dynamic DNA coding, convert the resulting file of each block sample into binary format to recover the floating point values ​​in binary encoded form; merge the results of all blocks into one signal for use in the encryption process.

[0132] After the scrambled audio signal is obtained through two scrambling operations, the scrambled audio signal is divided into multiple vectors consisting of 64 samples; the values ​​in each scrambled vector are converted into binary format; bits 1-8 are separated from each scrambled vector, and these bits are saved as flag values ​​to be used as flags in a random encryption key Ek selected from the encryption keys generated for each block; bits 9 to 24 (a total of 16 bits) are separated from each scrambled vector and stored in a binary vector SampV; an exclusive OR operation is performed between the SampV and EK vectors, and the result is saved in binary format as a vector ResV; ResV (16 bits) is returned to bits 9 to 24 in the scrambled vector; each value in the scrambled vector is converted from binary to floating point format; the multi-vector encrypted voice signal is converted into a single vector, and stored as a constructed encrypted audio signal; and the encrypted audio signal is transmitted.

[0133] Finally, the receiving end obtains the original audio signal based on the reverse process of the above encryption process, specifically including: dividing the encrypted voice signal samples into multiple vectors consisting of 64 samples; converting the values ​​in each scrambling vector into binary format (64 bits); dividing the 1st to 8th bits from each scrambling vector, and saving these bits as flag values ​​to be used as flags in the random encryption key EK (16 bits) selected from the encryption keys generated for each block; dividing the 9th to 24th bits (a total of 16 bits) from each scrambling vector and storing them in a binary vector SampV; performing an XOR operation between the SampV and EK vectors, and saving the result in binary format as a vector ResV; returning ResV (16 bits) to the 9th to 24th bits in the scrambling vector; converting each value in each scrambling vector from binary to floating point format; descrambling each vector based on the reverse process of the scrambling algorithm described above; converting the multi-vector decrypted voice signal into a single vector, and storing it as a constructed new signal; and transmitting the decrypted voice signal.

[0134] Finally, the security analysis of the encryption algorithm provided by the embodiment of the present invention is as follows: First, the key space is analyzed. Key space evaluation is a basic tool for evaluating the efficiency of a security system. A successful algorithm must have a large key space and be sensitive to the key value. The key space of the encryption system must be large enough to withstand brute force attacks. It is generally believed that a key space greater than 2128 is mathematically guaranteed to resist such attacks. (i) The proposed method uses a 32-byte key; (ii) the sine map has one control parameter; (iii) the extended logistic map has four control parameters; (iv) the Hénon map has two control parameters; and (v) the quantum chaos map has five initial requirements and two control parameters. The key space of this scheme is 32×1×4×2×5×2=2560, which meets these requirements. Therefore, this method meets the criteria for the cryptographic system to resist brute force attacks.

[0135] Encryption and Decryption Speed ​​Analysis: To optimize the real-time use of the proposed technique, we focused on generating a hard-to-predict key. Furthermore, we separated the scrambling phase from the encryption phase to reduce the time required for both encryption and decryption. Only a subset of the bits were encrypted (16 of the 64 bits in each speech signal sample). Table 3 shows the encryption and decryption times for five speech signal files. It can be seen that the required time increases with the number of samples in the speech stream. Comparing our results with those of the various studies reported in Table 3 shows that our proposed method produces faster results.

[0136]

[0137] Table 3

[0138] Multiple scrambling techniques relying on bits and blocks make brute-force attacks on the speech encryption process more difficult. This distinguishes this method from existing solutions. This method was evaluated by comparing it with other methods using syllables of varying lengths or durations. The results also demonstrate that this method is superior, as shown in Table 4.

[0139]

[0140]

[0141] Table 4

[0142] like Figure 3 As shown, Figure 3 : is a structural diagram of a control device provided by an embodiment of the present invention. The present invention also provides a control device, including:

[0143] The processor 801 may be implemented as a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is configured to execute relevant programs to implement the technical solutions provided in the embodiments of the present application.

[0144] The memory 802 can be implemented in the form of a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 802 can store an operating system and other application programs. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory 802 and is called by the processor 801 to execute the audio signal encryption method of the embodiments of this application.

[0145] Input / output interface 803, used to implement information input and output;

[0146] Communication interface 804, used to implement communication interaction between the apparatus and other devices, which can be achieved through wired means (such as USB, network cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.);

[0147] Bus 805 , which transmits information between various components of the device (e.g., processor 801 , memory 802 , input / output interface 803 , and communication interface 804 );

[0148] The processor 801 , the memory 802 , the input / output interface 803 and the communication interface 804 are connected to each other in communication within the device via a bus 805 .

[0149] An embodiment of the present application further provides an electronic device, including the control device as described above.

[0150] An embodiment of the present application further provides a storage medium, which is a computer-readable storage medium and stores a computer program. When the computer program is executed by a processor, the above-mentioned audio signal encryption method is implemented.

[0151] The memory, as a non-transient computer-readable storage medium, can be used to store non-transient software programs and non-transient computer executable programs. In addition, the memory may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some embodiments, the memory optionally includes a memory remotely located relative to the processor, and these remote memories can be connected to the processor via a network. Examples of the above-mentioned networks include but are not limited to the Internet, an intranet, a local area network, a mobile communication network and a combination thereof. The device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and are located in one place, or may be distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

[0152] Those skilled in the art will appreciate that all or some of the steps and systems in the method disclosed above can be implemented as software, firmware, hardware, and appropriate combinations thereof. Some physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, and the computer-readable medium can include computer storage media (or non-transitory media) and communication media (or temporary media). As known to those skilled in the art, the term computer storage media is included in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data) and is volatile and non-volatile, removable, and non-removable. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory, or other memory technology, CD-ROM, digital versatile disks (DVD), or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage, or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, as is well known to those skilled in the art, communication media typically includes computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0153] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the above implementation. Those skilled in the art can also make various equivalent modifications or substitutions under the shared conditions that do not violate the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. A method for encrypting an audio signal, characterized in that: Applied to an audio signal processing system, the system includes a transmitting end and a receiving end, and the audio signal encryption method includes: The audio signal encryption module obtains a key seed, converts the key seed into an encryption matrix based on a preset encoding rule and a chaotic matrix, and divides the encryption matrix into a plurality of key vectors, wherein the chaotic matrix is ​​generated based on a sine map, an extended logistic map, and a Hénon map; The audio signal encryption module obtains an original audio signal and divides the original audio signal into a plurality of original audio vectors; The audio signal encryption module scrambles all the original audio vectors to obtain multiple scrambled audio vectors, obtains an audio flag and a first vector from each of the scrambled audio vectors, and encrypts the first vectors based on the key vector, wherein one first vector corresponds to one key vector; The audio signal encryption module resynthesizes all corresponding scrambled audio vectors with the first vector based on the audio flag to obtain multiple encrypted audio vectors, and generates an encrypted audio signal based on the encrypted audio vectors.

2. The audio signal encryption method according to claim 1, characterized in that: The audio signal encryption module obtains a key seed and converts the key seed into an encryption matrix based on a preset encoding rule and a chaotic matrix, including: Taking each character in the key seed as a vertex and connecting every two vertices with an edge to generate a path graph, and encoding all characters in the path graph based on the encoding rule; Obtaining an adjacency matrix by calculation based on the encoded path graph, wherein the dimension of the adjacency matrix is ​​equal to the length of the character string of the key seed; Generate a plurality of random integer values ​​based on a sine map, process all the integer values ​​sequentially through an extended logistic map and a Hénon map to obtain a plurality of independent values, and generate a chaotic vector based on the independent values; Converting the chaotic vector into the chaotic matrix, wherein the dimension of the chaotic matrix is ​​equal to the string length of the key seed; The encoding matrix and the chaotic matrix are multiplied together, and the matrix obtained by the multiplication is further multiplied with the lower triangular matrix that has been rotated once to obtain the encryption matrix.

3. The audio signal encryption method according to claim 1, wherein: The audio signal encryption module scrambles all the original audio vectors to obtain a plurality of scrambled audio vectors, including: Divide the original audio signal into a plurality of first value blocks, wherein each of the first value blocks includes N characters, where N is a positive integer; generating an index key based on a quantum logistic chaotic map, wherein the index key includes a plurality of samples, and the number of the samples is equal to the number of the characters of the first value block; reordering the position of each character in each first value block based on the order of the samples in the index key to obtain a plurality of primary scrambling vectors; A primary scrambled audio is generated based on all the primary scrambling vectors.

4. The audio signal encryption method according to claim 3, characterized in that: The audio signal encryption module scrambles all the original audio vectors to obtain a plurality of scrambled audio vectors, and further comprises: Dividing the primary scrambled audio into a plurality of second value blocks, wherein each second value block includes 2N characters, where N is a positive integer; converting all the second value blocks from a floating point format to a binary format, and converting a first preset number segment in each of the second value blocks into a DNA sequence, wherein the first preset number segment is composed of a continuous segment of characters in the second value block; After the conversion is completed, all the second value blocks are restored to a floating point format, and the scrambled audio vector is generated based on all the second value blocks.

5. The audio signal encryption method according to claim 1, wherein: The obtaining an audio marker and a first vector from each of the scrambled audio vectors, and encrypting the first vector based on the key vector, includes: converting all numerical values ​​constituting the scrambled audio vector from a floating point format to a binary format, generating the audio marker based on a second preset number segment in the scrambled audio vector, and segmenting the first vector based on a third preset number segment in the scrambled audio vector, wherein the second preset number segment and the third preset number segment are both composed of a continuous segment of characters in the scrambled audio vector, and the second preset number segment and the third preset number segment are adjacent to each other; An exclusive OR operation is performed on each of the first vectors and each of the key vectors to generate a plurality of second vectors, wherein an exclusive OR operation is performed on one of the first vectors and one of the key vectors.

6. The audio signal encryption method according to claim 5, characterized in that: The step of resynthesizing all corresponding scrambled audio vectors with the first vector based on the audio flag to obtain a plurality of encrypted audio vectors includes: converting all the second vectors into third value blocks, and re-adding each of the third value blocks to the scrambled audio vector based on the audio flag to obtain a plurality of the encrypted audio vectors, wherein the positions of the third value blocks are the same as the positions of the third preset number segments; All numerical values ​​constituting the scrambled audio vector are converted from binary format to floating point format.

7. The audio signal encryption method according to claim 6, characterized in that: The audio signal processing system further includes an audio signal decryption module, the audio signal decryption module being communicatively connected to the audio signal encryption module. After the audio signal encryption module generates an encrypted audio signal based on the encrypted audio vector, the method further includes: The audio signal encryption module sends the encrypted audio signal to the audio signal decryption module; The audio signal decryption module converts all the second vectors in the encrypted audio vector into the first vector based on the encrypted audio vector, the audio flag and the key vector to obtain a scrambled audio signal; The audio signal decryption module performs descrambling processing on the scrambled audio signal to obtain the original audio signal.

8. A control device, characterized in that: The invention comprises at least one control processor and a memory for communicating with the at least one control processor; the memory stores instructions that can be executed by the at least one control processor, and the instructions are executed by the at least one control processor to enable the at least one control processor to perform the audio signal encryption method according to any one of claims 1 to 7.

9. An electronic device, characterized in that: Comprising the control device according to claim 8.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the audio signal encryption method according to any one of claims 1 to 7.

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