CN111031322B - BMP image encryption and decryption method and device of self-synchronizing chaotic stream cipher - Google Patents

BMP image encryption and decryption method and device of self-synchronizing chaotic stream cipher Download PDF

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CN111031322B
CN111031322B CN201911016921.6A CN201911016921A CN111031322B CN 111031322 B CN111031322 B CN 111031322B CN 201911016921 A CN201911016921 A CN 201911016921A CN 111031322 B CN111031322 B CN 111031322B
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林卓胜
梁惠珠
冯跃
梁淑芬
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Wuyi University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/46—Embedding additional information in the video signal during the compression process
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/001—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols using chaotic signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/06—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols the encryption apparatus using shift registers or memories for block-wise or stream coding, e.g. DES systems or RC4; Hash functions; Pseudorandom sequence generators
    • H04L9/065—Encryption by serially and continuously modifying data stream elements, e.g. stream cipher systems, RC4, SEAL or A5/3
    • H04L9/0656—Pseudorandom key sequence combined element-for-element with data sequence, e.g. one-time-pad [OTP] or Vernam's cipher

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Abstract

The invention discloses a BMP image encryption and decryption method and device of self-synchronization chaotic stream cipher, comprising the steps of S100: decomposing the original BMP format color image into RGB three-channel data; step S200: generating three groups of encrypted pseudo-random sequences by using a self-synchronizing chaotic stream cipher system; step S300, respectively encrypting each RGB data of the color image by using the generated three groups of pseudo-random sequences; and S400, synthesizing the encrypted RGB three-channel data into an encrypted image in BMP format. The invention also discloses a decryption method thereof. The image encryption and decryption method of the invention leads the generation of the pseudo-random sequence to be closely related to the ciphertext data, and compared with the similar method, the security of the BMP image is enhanced.

Description

BMP image encryption and decryption method and device of self-synchronizing chaotic stream cipher
Technical Field
The invention relates to the technical field of image encryption and decryption, in particular to a BMP image encryption and decryption method and device of a self-synchronizing chaotic stream password.
Background
With the development of technologies such as broadband internet, handheld devices, etc., digital images are widely spread in daily life, and the security problem thereof is receiving increasing attention from people. In special fields such as military industry, medical treatment and the like, the requirement of high confidentiality is further met. To prevent data leakage, the most efficient approach is encryption. For the application occasions with high requirements on image quality, lossless compression technology and space domain image encryption technology are required to be adopted. The chaos cipher as one of three novel cipher technologies has more application in the field, but some cipher analysis work indicates that the security performance of some chaos image encryption methods in the prior art is insufficient, most of the technologies are fixed through a pseudo-random sequence generated by a chaos system, and a self-synchronization chaos stream cipher system can enable the generated pseudo-random sequence to be changed along with the change of an input plaintext image, and meanwhile, the limited propagation of errors is guaranteed.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a BMP image encryption and decryption method and device using a self-synchronizing chaotic stream cipher, so that the security of a BMP image is improved.
The technical scheme adopted by the invention for solving the problems is as follows:
in a first aspect, an embodiment of the present invention provides a BMP image encryption method for self-synchronizing chaotic stream ciphers, including:
decomposing the original BMP format color image into RGB three-channel data;
generating three groups of encrypted pseudo-random sequences by using a self-synchronizing chaotic stream cipher system;
respectively encrypting each RGB data of the color image by using the generated three groups of encrypted pseudo-random sequences;
and synthesizing the encrypted RGB three-channel data into an encrypted image in BMP format.
Further, the generating three groups of encrypted pseudo-random sequences by using the self-synchronizing chaotic stream cipher system comprises:
establishing a six-dimensional discrete chaotic system with a kinetic equation of
Figure BDA0002245987930000021
Parameter in the formula
Figure BDA0002245987930000022
The characteristic roots of the formed six-dimensional matrix are all positioned in the unit circle,
Figure BDA0002245987930000023
for a feedback controller,. epsiloni,σi(i is more than or equal to 1 and less than or equal to 3) are respectively control parameters, sin () is a sine function, cos () is a cosine function, and mod () is a modulus function;
according to the six-dimensional discrete chaotic system, the ciphertext is fed back to the chaotic system to obtain an iterative equation of the encrypted self-synchronizing chaotic stream cipher as
Figure BDA0002245987930000031
In the formula p1(k),p2(k),p3(k) For encrypting data, the iteration number k is the size and parameter of the original color image
Figure BDA0002245987930000032
And
Figure BDA0002245987930000033
as an encryption key;
three groups of encrypted pseudo-random sequences generated by an iterative system are
Figure BDA0002245987930000034
In the formula
Figure BDA0002245987930000035
As a function of the bitwise XOR, sign
Figure BDA0002245987930000036
In order to get the function of integer downwards, the generation of the encrypted pseudorandom sequence is closely related to the ciphertext as can be seen from an iterative equation and a pseudorandom sequence generation mode.
Further, the encryption operation in encrypting each RGB data of the color image by using the generated three groups of encrypted pseudo-random sequences is respectively as follows
Figure BDA0002245987930000037
In the formula, R (k), G (k), B (k) are RGB three-channel data obtained by decomposing the original BMP format color image.
Further, the synthesizing of the encrypted RGB three-channel data into an encrypted image in the BMP format includes: the encrypted RGB three-channel data p1(k),p2(k),p3(k) (k ═ 1,2, L) is synthesized as an encrypted image in BMP format.
In a second aspect, an embodiment of the present invention further provides a BMP image decryption method using a self-synchronization chaotic stream cipher, including:
decomposing the encrypted BMP format color image according to RGB three channels;
generating three groups of pseudo-random sequences by using a self-synchronizing chaotic stream cipher system;
respectively decrypting each RGB encrypted data of the encrypted image by using the generated three groups of pseudo-random sequences;
and synthesizing the decrypted RGB three-channel data into a decrypted image in the BMP format.
Further, decomposing the encrypted BMP format color image according to three RGB channels includes: decomposing the encrypted BMP format color image according to RGB three channels to obtain three-channel data p1(k),p2(k),p3(k)(k＝1,2,L)。
Further, the generating three groups of pseudo-random sequences by using the self-synchronizing chaotic stream cipher system comprises: according to the six-dimensional discrete chaotic system, the iterative equation for decrypting the self-synchronizing chaotic stream cipher is obtained as
Figure BDA0002245987930000041
Parameter in the formula
Figure BDA0002245987930000042
And
Figure BDA0002245987930000043
as a decryption key;
the three paths of decryption pseudo-random sequences generated by the iterative system are
Figure BDA0002245987930000051
Further, the respectively decrypting each of the RGB encrypted data of the encrypted image using the generated three sets of pseudo random sequences includes:
the decryption operation is
Figure BDA0002245987930000052
Further, the synthesizing of the decrypted RGB three-channel data into a decrypted image in the BMP format includes: encrypted RGB three-channel data
Figure BDA0002245987930000053
And synthesizing into a decrypted image in BMP format.
In a third aspect, an embodiment of the present invention further provides a BMP image encryption and decryption device for self-synchronizing chaotic stream cipher, including:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of the first and second aspects of the invention.
One or more technical schemes provided in the embodiment of the invention have at least the following beneficial effects: the BMP image encryption and decryption method and equipment based on the self-synchronizing chaotic stream cipher provided by the invention have the advantages that the generation of the pseudo-random sequence is closely related to cipher text data, and compared with the existing method, the safety of the BMP image is enhanced.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic flow chart of a BMP image encryption method using a self-synchronizing chaotic stream cipher according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a BMP image encryption algorithm for a self-synchronizing chaotic stream cipher;
FIG. 3 is an original BMP format image (Lena);
FIG. 4 is an attractor phase diagram of a six-dimensional chaotic system;
FIG. 5 is an encrypted image;
FIG. 6 is a schematic flow chart of a BMP image decryption method using a self-synchronizing chaotic stream cipher according to a second embodiment of the present invention;
FIG. 7 is a schematic diagram of a BMP image decryption algorithm for a self-synchronizing chaotic stream cipher;
FIG. 8 is a correct decrypted image with parameter adaptation;
FIG. 9 is an erroneous decrypted image of parameter mismatch;
fig. 10 is a schematic diagram of a BMP image encryption and decryption device of a self-synchronizing chaotic stream cipher according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that, if not conflicted, the various features of the embodiments of the invention may be combined with each other within the scope of protection of the invention. Additionally, while functional block divisions are performed in apparatus schematics, with logical sequences shown in flowcharts, in some cases, steps shown or described may be performed in sequences other than block divisions in apparatus or flowcharts.
The embodiments of the present invention will be further explained with reference to the drawings.
As shown in fig. 1-2, a first embodiment of the present invention provides a BMP image encryption method using a self-synchronizing chaotic stream cipher, which includes, but is not limited to, the following steps:
s100, decomposing the original BMP format color image into RGB three-channel data;
s200, generating three groups of encrypted pseudo-random sequences by using a self-synchronizing chaotic stream cipher system;
s300, respectively encrypting each RGB data of the color image by using the generated three groups of encrypted pseudo-random sequences;
and S400, synthesizing the encrypted RGB three-channel data into an encrypted image in BMP format.
In step S100, the original BMP format color image is decompressed into RGB three-channel data by a BMP decompression algorithm. As shown in fig. 3, Lena images having a size of 256 × 256 are taken as an example of the original BMP format images.
In step S200, three sets of encrypted pseudo-random sequences are generated by using a self-synchronizing chaotic stream cipher system, including the following steps:
A. establishing a specific six-dimensional discrete chaotic system with a kinetic equation of
Figure BDA0002245987930000081
Parameter in the formula
Figure BDA0002245987930000082
The characteristic roots of the formed six-dimensional matrix are respectively positioned in the unit circle,
Figure BDA0002245987930000083
in order to be a feedback controller, the controller,
εi,σi(i is more than or equal to 1 and less than or equal to 3) are respectively control parameters, sin () is a sine function, cos () is a cosine function, and mod () is a modulus function;
selecting epsilon1＝1×107,ε2＝2×107,ε3＝3×107,σ1＝4000,σ2＝5000,σ3＝6000，
Corresponding to the chaotic attractor phase diagram, as shown in FIG. 4, calculating to obtain corresponding Lyapunov exponent respectively LE1＝11.4279,LE2＝11.3735,LE3＝10.6583,LE4＝10.6393,LE5＝3.8954，LE6＝3.886。
B. According to the six-dimensional discrete chaotic system, the iterative equation of the encrypted self-synchronizing chaotic stream password is obtained as
Figure BDA0002245987930000091
In the formula p1(k),p2(k),p3(k) For encrypting data, the iteration number k is 256X 256 of the size of the original color image, the parameters (i is more than or equal to 1 and j is less than or equal to 6) and
Figure BDA0002245987930000092
as an encryption key.
C. The iterative system generates a three-way encrypted pseudorandom sequence of
Figure BDA0002245987930000093
In the formula
Figure BDA0002245987930000094
As a function of the bitwise XOR, sign
Figure BDA0002245987930000095
In order to get the function of integer downwards, the generation of the encrypted pseudorandom sequence is closely related to the ciphertext as can be seen from an iterative equation and a pseudorandom sequence generation mode.
In step S300, the encryption operation is
Figure BDA0002245987930000096
In the formula, r (k), g (k), and b (k) are three-channel data of the original BMP color image obtained in step S100.
In step S400, as shown in fig. 5, the encrypted RGB three-channel data p is processed1(k),p2(k),p3(k) (k ═ 1,2, L) is compressed by the BMP compression algorithm into an encrypted image in BMP format.
In addition, as shown in fig. 6 to 7, a second embodiment of the present invention provides a BMP image decryption method using self-synchronizing chaotic stream cipher, including, but not limited to, the following steps:
s500, decomposing the encrypted BMP format color image according to RGB three channels;
s600, generating three groups of pseudo-random sequences by using a self-synchronizing chaotic stream cipher system;
s700, respectively decrypting each RGB encrypted data of the encrypted image by using the generated three groups of pseudo-random sequences;
and S800, synthesizing the decrypted RGB three-channel data into a decrypted image in a BMP format.
In step S500, since the BMP is in lossless format, three-channel data p is obtained by decompression through BMP decompression algorithm1(k),p2(k),p3(k)(k＝1,2,L)。
In step S600, according to the six-dimensional discrete chaotic system in the encryption method, the iterative equation for decrypting the self-synchronizing chaotic stream cipher is obtained as
Figure BDA0002245987930000101
Parameter in the formula
Figure BDA0002245987930000102
And
Figure BDA0002245987930000103
as a decryption key.
The three paths of decryption pseudo-random sequences generated by the iterative system are
Figure BDA0002245987930000104
In step S700, the decryption operation is
Figure BDA0002245987930000111
In step S800, as shown in fig. 8, the encrypted RGB three-channel data is processed
Figure BDA0002245987930000112
And compressing the decrypted image into a BMP format through a BMP compression algorithm. When the key of the decryption end is matched with the key of the encryption end, correct decryption can be realized to obtainCorrectly decrypting the image; when the key at the decryption end is mismatched with the key at the encryption end, the decryption is wrong, as shown in FIG. 9, which shows that other keys are matched with the key at the decryption end only
Figure BDA0002245987930000113
Becomes an erroneous decrypted image of 0.381.
In summary, compared with the prior art, the BMP image encryption and decryption method based on the self-synchronization chaotic stream cipher has the advantages that: the method leads the generation of the pseudorandom sequence to be closely related to the ciphertext data, and compared with the existing method, the method enhances the safety of the BMP image.
As shown in fig. 10, the third embodiment of the present invention further provides a BMP image encryption and decryption apparatus using self-synchronizing chaotic stream cipher, including:
at least one processor;
and a memory communicatively coupled to the at least one processor;
wherein the memory stores instructions executable by the at least one processor, the instructions being executable by the at least one processor to enable the at least one processor to perform a BMP image encryption method of any one of the self-synchronizing chaotic stream ciphers as in the first embodiment and a BMP image decryption method of any one of the self-synchronizing chaotic stream ciphers as in the second embodiment.
The memory, which is a non-transitory computer readable storage medium, may be used to store non-transitory software programs, non-transitory computer executable programs, and modules, such as program instructions/modules corresponding to the virtual image control method in the embodiments of the present invention. The processor executes various functional applications and data processing of the stereo imaging processing device by running the non-transitory software program, the instructions and the modules stored in the memory, that is, the BMP image encryption and decryption method of the self-synchronization chaotic stream cipher of any of the above method embodiments is realized.
The memory may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the stereoscopic imaging processing device, and the like. Further, the memory may include high speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory optionally includes memory remotely located from the processor, and the remote memory may be connected to the stereoscopic projection device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more modules are stored in the memory, and when executed by the one or more processors, perform the BMP image encryption and decryption method of the self-synchronizing chaotic stream cipher in any of the above-described method embodiments, such as the method steps S100 to S400 in the first embodiment and the method steps S500 to S800 in the second embodiment.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the foregoing and various other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention.

Claims (8)

1. A BMP image encryption method of self-synchronization chaotic stream cipher is characterized by comprising the following steps:
decomposing the original BMP format color image into RGB three-channel data;
generating three groups of encrypted pseudo-random sequences by using a self-synchronizing chaotic stream cipher system;
respectively encrypting each RGB data of the color image by using the generated three groups of encrypted pseudo-random sequences;
synthesizing the encrypted RGB three-channel data into an encrypted image in BMP format;
the method for generating three groups of encrypted pseudo-random sequences by using the self-synchronizing chaotic stream cipher system comprises the following steps:
establishing a six-dimensional discrete chaotic system with a kinetic equation of
Figure FDA0003153359120000011
Parameter in the formula
Figure FDA0003153359120000012
The characteristic roots of the formed six-dimensional matrix are all positioned in the unit circle,
Figure FDA0003153359120000021
for a feedback controller,. epsiloni,σiI is more than or equal to 1 and less than or equal to 3, and the i is respectively a control parameter, sin () is a sine function, cos () is a cosine function, and mod () is a modulus function;
according to the six-dimensional discrete chaotic system, the ciphertext is fed back to the chaotic system to obtain an iterative equation of the encrypted self-synchronizing chaotic stream cipher as
Figure FDA0003153359120000022
In the formula p1(k),p2(k),p3(k) For encrypting data, the iteration number k is the size and parameter of the original color image
Figure FDA0003153359120000023
1 is less than or equal to i, j is less than or equal to 6, and
Figure FDA0003153359120000024
k is more than or equal to 1 and less than or equal to 3 and is used as an encryption key;
three groups of encrypted pseudo-random sequences generated by an iterative system are
Figure FDA0003153359120000025
In the formula
Figure FDA0003153359120000026
As a function of the bitwise XOR, sign
Figure FDA0003153359120000027
Is a rounded down function.
2. The BMP image encryption method of claim 1, wherein the encryption operation in encrypting each RGB data of the color image respectively by using the generated three sets of encrypted pseudo-random sequences is
Figure FDA0003153359120000031
In the formula, R (k), G (k), B (k) are RGB three-channel data obtained by decomposing the original BMP format color image.
3. The BMP image encryption method based on self-synchronizing chaotic stream ciphers of claim 1, wherein the synthesizing the encrypted RGB three-channel data into the BMP format encrypted image comprises: the encrypted RGB three-channel data p1(k),p2(k),p3(k) And k is 1,2, …, and is synthesized as an encrypted image in BMP format.
4. A BMP image decryption method of self-synchronization chaotic stream cipher is characterized by comprising the following steps:
decomposing the encrypted BMP format color image according to RGB three channels;
generating three groups of pseudo-random sequences by using a self-synchronizing chaotic stream cipher system;
respectively decrypting each RGB encrypted data of the encrypted image by using the generated three groups of pseudo-random sequences;
the decrypted RGB three-channel data is synthesized into a decrypted image in BMP format;
the method for generating three groups of pseudo-random sequences by using the self-synchronizing chaotic stream cipher system comprises the following steps:
according to the six-dimensional discrete chaotic system, the iterative equation for decrypting the self-synchronizing chaotic stream cipher is obtained as
Figure FDA0003153359120000032
Parameter in the formula
Figure FDA0003153359120000033
1 is less than or equal to i, j is less than or equal to 6, and
Figure FDA0003153359120000034
k is more than or equal to 1 and less than or equal to 3 and is used as a decryption key;
the three paths of decryption pseudo-random sequences generated by the iterative system are
Figure FDA0003153359120000041
5. The BMP image decryption method of the self-synchronizing chaotic stream cipher according to claim 4, wherein decomposing the color image in the encrypted BMP format according to RGB three channels comprises: decomposing the encrypted BMP format color image according to RGB three channels to obtain three-channel data p1(k),p2(k),p3(k)，k＝1,2,…。
6. The BMP image decryption method of the self-synchronizing chaotic stream cipher according to claim 4, wherein the respectively decrypting each RGB encrypted data of the encrypted image by using the generated three sets of pseudo random sequences comprises:
the decryption operation is
Figure FDA0003153359120000042
7. The BMP image decryption method of the self-synchronizing chaotic stream cipher according to claim 4, wherein the synthesizing of the decrypted RGB three-channel data into the decrypted image in BMP format comprises: encrypted RGB three-channel data
Figure FDA0003153359120000043
And k is 1,2, …, and the decrypted image in BMP format is synthesized.
8. A BMP image encryption and decryption device of a self-synchronizing chaotic stream cipher is characterized by comprising:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1 to 7.
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