CN107809310B - Information detection method and device based on grouping variance and receiving equipment - Google Patents
Information detection method and device based on grouping variance and receiving equipment Download PDFInfo
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- CN107809310B CN107809310B CN201711132736.4A CN201711132736A CN107809310B CN 107809310 B CN107809310 B CN 107809310B CN 201711132736 A CN201711132736 A CN 201711132736A CN 107809310 B CN107809310 B CN 107809310B
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- 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
- H04L9/0618—Block ciphers, i.e. encrypting groups of characters of a plain text message using fixed encryption transformation
- H04L9/0631—Substitution permutation network [SPN], i.e. cipher composed of a number of stages or rounds each involving linear and nonlinear transformations, e.g. AES algorithms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0047—Decoding adapted to other signal detection operation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
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Abstract
The embodiment of the invention discloses an information detection method based on grouping variance, which comprises the following steps: receiving the first carrier information after channel matching; carrying out relevant processing on the first carrier information to sequentially obtain second carrier information, original carrier information and third carrier information; comparing the second carrier information with the original carrier information and determining the position of the second carrier information different from the original carrier information; extracting a first value at a different position of the first carrier information and a second value at a different position of the third carrier information, and determining a first standard deviation of a difference between the first value and the second value; judging whether the first standard deviation is larger than a preset threshold value or not; if yes, the first carrier information is judged to have the secret information. The embodiment of the invention can accurately detect the secret information.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to an information detection method and apparatus based on a packet variance, and a receiving device.
Background
Replacing steganography means that after channel coding, the original information is embedded with the stego information, and the stego information directly replaces the original partial information to achieve the purpose of information hiding.
Currently, in steganography analysis technology, in terms of detection of Least Significant Bit (LSB) steganography, the chi-square detection method is the earliest detection algorithm, which tests the probability of the image having such statistical characteristics by defining a chi-square statistic, realizes detection of sequential LSB replacement, but cannot detect LSB replacement at random positions. The detection algorithm aiming at LSB matching basically adopts methods such as neural network and pattern recognition to train a feature set to extract effective features, and then realizes the detection of the secret information through the joint judgment of a plurality of features, but the methods have large computation amount, inaccurate detection result and limitation.
Disclosure of Invention
The embodiment of the invention discloses an information detection method, an information detection device and receiving equipment based on grouping variance, which can accurately detect secret information.
The first aspect of the embodiments of the present invention discloses an information detection method based on a grouping variance, including:
receiving the first carrier information after channel matching;
carrying out relevant processing on the first carrier information to sequentially obtain second carrier information, original carrier information and third carrier information;
comparing the second carrier information with the original carrier information and determining the position of the second carrier information different from the original carrier information;
extracting a first value at said different location of said first carrier information and a second value at said different location of said third carrier information and determining a first standard deviation of the difference between said first value and said second value;
judging whether the first standard deviation is larger than a preset threshold value or not;
if yes, determining that the first carrier information contains secret information.
As an optional implementation manner, in the first aspect of this embodiment of the present invention, the method further includes:
determining the position of the second carrier information which is the same as the original carrier information;
extracting a third value at said same position of said first carrier information and a fourth value at said same position of said third carrier information and determining a second standard deviation of the difference of said third value and said fourth value;
and determining the preset threshold according to the second standard deviation.
As an optional implementation manner, in the first aspect of the embodiment of the present invention, the performing correlation processing on the first carrier information to sequentially obtain second carrier information, original carrier information, and third carrier information includes:
demodulating the first carrier information to obtain second carrier information;
decoding and recoding the second carrier information to obtain original carrier information;
and re-modulating the original carrier information to obtain third carrier information.
As an optional implementation manner, in the first aspect of this embodiment of the present invention, the method further includes:
and if the first standard deviation is smaller than or equal to the preset threshold, determining that the first carrier information does not have the secret information.
A second aspect of an embodiment of the present invention discloses an information detection apparatus, including:
a receiving unit, configured to receive the first carrier information after channel matching;
the processing unit is used for carrying out relevant processing on the first carrier information and sequentially obtaining second carrier information, original carrier information and third carrier information;
a comparison determination unit, configured to compare the second carrier information with the original carrier information, and determine a position where the second carrier information is different from the original carrier information;
an extraction determination unit configured to extract a first value at the different position of the first carrier information and extract a second value at the different position of the third carrier information, and determine a first standard deviation of a difference between the first value and the second value;
the judging unit is used for judging whether the first standard deviation is larger than a preset threshold value or not;
and the judging unit is used for judging that the first carrier information has the secret information when the judging unit judges that the first standard deviation is larger than the preset threshold value.
As an optional implementation manner, in the second aspect of the embodiment of the present invention, the comparison determining unit is further configured to determine a position where the second carrier information is the same as the original carrier information;
the extraction determination unit is further configured to extract a third numerical value at the same position of the first carrier information and a fourth numerical value at the same position of the third carrier information, and determine a second standard deviation of a difference between the third numerical value and the fourth numerical value;
the information detection apparatus further includes:
and the determining unit is used for determining the preset threshold according to the second standard deviation.
As an optional implementation manner, in the second aspect of the embodiment of the present invention, the performing, by the processing unit, correlation processing on the first carrier information, and sequentially obtaining second carrier information, original carrier information, and third carrier information includes:
demodulating the first carrier information to obtain second carrier information;
decoding and recoding the second carrier information to obtain original carrier information;
and re-modulating the original carrier information to obtain third carrier information.
As an optional implementation manner, in the second aspect of the embodiment of the present invention, the determining unit is further configured to determine that secret information is not present in the first carrier information when the determining unit determines that the first standard deviation is smaller than or equal to the preset threshold.
A third aspect of embodiments of the present invention discloses a receiving device, where the receiving device includes a processor and a memory, and the processor executes a computer program stored in the memory to implement the packet variance-based information detection method according to any one of the first aspect.
A computer-readable storage medium storing at least one instruction which, when executed by a processor, implements the packet variance-based information detection method according to any one of the first aspects.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, the receiving device can receive the first carrier information after channel matching; carrying out relevant processing on the first carrier information to sequentially obtain second carrier information, original carrier information and third carrier information; comparing the second carrier information with the original carrier information and determining the position of the second carrier information different from the original carrier information; extracting a first value at said different location of said first carrier information and a second value at said different location of said third carrier information and determining a first standard deviation of the difference between said first value and said second value; judging whether the first standard deviation is larger than a preset threshold value or not; if yes, determining that the first carrier information contains secret information. Therefore, by implementing the embodiment of the present invention, the receiving device may perform relevant processing on the received first carrier information, sequentially obtain the second carrier information, the original carrier information, and the third carrier information, and further compare, analyze, and determine the first carrier information, the second carrier information, the original carrier information, and the third carrier information, so as to determine that the secret information exists in the first carrier information, thereby accurately detecting the secret information.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a diagram of an alternative steganographic communication model disclosed in an embodiment of the present invention;
FIG. 2 is a flow chart of an information detection method based on packet variance according to an embodiment of the present invention;
FIG. 3 is a graph illustrating standard deviation and signal-to-noise ratio at different locations according to an embodiment of the present disclosure;
FIG. 4 is a diagram illustrating a detection success rate and a signal-to-noise ratio according to an embodiment of the present invention;
FIG. 5 is a graph illustrating standard deviation and signal-to-noise ratio at various locations in accordance with an embodiment of the present disclosure;
FIG. 6 is a diagram illustrating another exemplary detection success rate and signal-to-noise ratio disclosed in the embodiments of the present invention;
FIG. 7 is a schematic structural diagram of an information detection apparatus according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a receiving device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first", "second", "third" and "fourth", etc. in the description and claims of the present invention and the above-mentioned drawings are used for distinguishing different objects and are not used for describing a specific order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
The embodiment of the invention discloses an information detection method, an information detection device and receiving equipment based on grouping variance, which can accurately detect secret information. The following detailed description is made with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a communication model diagram of replacing steganography according to an embodiment of the present invention. As shown in fig. 1, the communication model of replacing steganography may include two processes: a transmission process and a reception process.
Wherein the sending process is mainly performed by the sending device. The transmitting device may include a base station or a user equipment. A base station (e.g., access point) can refer to a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminals. The base station may be configured to interconvert received air frames and IP packets as a router between the wireless terminal and the rest of the access network, which may include an Internet Protocol (IP) network. The base station may also coordinate management of attributes for the air interface. For example, the Base station may be a Base Transceiver Station (BTS) in GSM or CDMA, a Base station (NodeB) in WCDMA, or an evolved Node B (NodeB or eNB or e-NodeB) in LTE, which is not limited in the embodiment of the present invention. The user Device may include, but is not limited to, a smart Phone, a notebook Computer, a Personal Computer (PC), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), a wearable Device (e.g., a smart watch, a smart bracelet, and smart glasses), and other electronic devices, wherein an operating system of the user Device may include, but is not limited to, an Android operating system, an IOS operating system, a Symbian operating system, a blackberry operating system, a Windows Phone8 operating system, and the like, and embodiments of the present invention are not limited thereto.
In the sending process, the sending equipment is divided into two paths, one path is that carrier information is coded, the other path is that secret information is coded, after the two paths are coded, the secret information is embedded into the carrier information to be modulated, and then the carrier information is sent into a channel and sent to the receiving equipment through the channel.
Wherein the receiving process is mainly performed by the receiving device. Wherein, the receiving device may comprise a base station or a user equipment. A base station (e.g., access point) can refer to a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminals. The base station may be configured to interconvert received air frames and IP packets as a router between the wireless terminal and the rest of the access network, which may include an Internet Protocol (IP) network. The base station may also coordinate management of attributes for the air interface. For example, the Base station may be a Base Transceiver Station (BTS) in GSM or CDMA, a Base station (NodeB) in WCDMA, or an evolved Node B (NodeB or eNB or e-NodeB) in LTE, which is not limited in the embodiment of the present invention. The user Device may include, but is not limited to, a smart Phone, a notebook Computer, a Personal Computer (PC), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), a wearable Device (e.g., a smart watch, a smart bracelet, and smart glasses), and other electronic devices, wherein an operating system of the user Device may include, but is not limited to, an Android operating system, an IOS operating system, a Symbian operating system, a blackberry operating system, a Windows Phone8 operating system, and the like, and embodiments of the present invention are not limited thereto.
In the receiving process, after demodulating the received signal, the receiving device extracts the demodulated signal and then decodes the demodulated signal to obtain the secret information, and then decodes the signal from which the secret information is extracted to obtain the carrier information.
Specifically, the specific embedding manner of the secret information can be illustrated by taking BINARY phase shift keying (BINARY PHASE SHIFTKEYING, BPSK) as an example, the carrier information becomes a 0,1 sequence after being encoded, and the secret information is also a 0,1 sequence after being encoded, so that the secret information can randomly replace some positions of the carrier information to hide information, at this time, 0 of the carrier information can be replaced by 1 of the secret information, 1 of the carrier information can be replaced by 0 of the secret information, and after BPSK, that is, changing from-1 to 1, changing from 1 to-1. Of course, to ensure that the original carrier information can be subsequently recovered, the number of bits of the stego information needs to be less than the number of bits that can be corrected by the error correction capability of the carrier information. For example, assuming that the encoded information bits have k bits and a total of n symbols, the number of bits that can be correctedAnd taking an integer, so that the bit number of the secret information is less than t, and the replacing steganography can be carried out.
Referring to fig. 2, fig. 2 is a flowchart illustrating an information detection method based on packet variance according to an embodiment of the present invention. As shown in fig. 2, the packet variance-based information detection method may include the steps of:
Replacing steganography means that after channel coding, the original information is embedded with the stego information, and the stego information directly replaces the original partial information to achieve the purpose of information hiding.
In the invention, the sending device sends out the first carrier information after replacing the steganography through a channel, and the receiving device can receive the first carrier information from the channel, wherein the first carrier information is information after being coded and modulated. The channel is a fading channel, that is, a channel fading with distance, and if the distance is fixed, the channel is constant.
The formula of channel matching is as follows:
where Y is the carrier information multiplied by channel H, conj (H) is the conjugate of H, noise is noise, and Y1 is the first carrier information.
In the present invention, a manner that the receiving device performs related processing on the first carrier information to sequentially obtain the second carrier information, the original carrier information, and the third carrier information may specifically be:
demodulating the first carrier information to obtain second carrier information;
decoding and recoding the second carrier information to obtain original carrier information;
and re-modulating the original carrier information to obtain third carrier information.
In the invention, the second carrier information is decoded, so that the secret information which is possibly hidden in the second carrier information can be erased, and the original carrier information can be obtained after recoding. Wherein the first carrier information may comprise stego information and the third carrier information does not comprise stego information.
Step 203, the receiving device compares the second carrier information with the original carrier information, and determines a position where the second carrier information is different from the original carrier information.
In the present invention, the second carrier information and the original carrier information are both represented by a multi-bit value (e.g. 0, 1). The receiving device may compare the second carrier information with the original carrier information to determine the same location and a different location of the second carrier information than the original carrier information. Such as: the second carrier information is 00, the original carrier information is 01, the same position of the second carrier information and the original carrier information is a first position, and the different position of the second carrier information and the original carrier information is a second position.
Step 204, the receiving device extracts a first value at the different position of the first carrier information and extracts a second value at the different position of the third carrier information, and determines a first standard deviation of a difference between the first value and the second value.
In the present invention, after determining the different position of the second carrier information from the original carrier information, the receiving device extracts a first value at the different position of the first carrier information and extracts a second value at the different position of the third carrier information, for example: assuming that the same position of the second carrier information as the original carrier information is a first bit and the different position of the second carrier information from the original carrier information is a second bit, the receiving device may extract a first value on the second bit of the first carrier information and extract a second value on the second bit of the third carrier information.
Further, the receiving device may determine a first standard deviation of a difference of the first value and the second value.
As an optional embodiment, the method further comprises the steps of:
11) determining the position of the second carrier information which is the same as the original carrier information;
12) extracting a third value at said same position of said first carrier information and a fourth value at said same position of said third carrier information and determining a second standard deviation of the difference of said third value and said fourth value;
13) and determining the preset threshold according to the second standard deviation.
In this optional embodiment, when comparing the second carrier information with the original carrier information, the receiving device may further determine a same position of the second carrier information and the original carrier information, further extract a third value at the same position of the first carrier information and a fourth value at the same position of the third carrier information, and determine a second standard deviation of a difference between the third value and the fourth value. For example: assuming that the same position of the second carrier information as the original carrier information is a first position and the position of the second carrier information different from the original carrier information is a second position, the receiving device may extract a third value on the first position of the first carrier information and extract a fourth value on the first position of the third carrier information, and further, the receiving device may determine a second standard deviation of a difference value between the third value and the fourth value.
Still further, the receiving device may determine the preset threshold according to the second standard deviation. Wherein the preset threshold value may be determined with reference to the following formula:
wherein, T0For a preset threshold, Φ is a standard gaussian cumulative distribution function,t is the distribution variable of the standard gaussian cumulative distribution function, std _ same is the second standard deviation at the same position, PFA is the false alarm probability. The false alarm probability can be understood as the probability that the first carrier information without the secret information is determined to be the first carrier information with the secret information. The preset threshold value can be determined by limiting the false alarm probability and maximizing the detection rate of the secret information.
Referring to fig. 3 and fig. 4 together, fig. 3 is a schematic diagram of a standard deviation and a signal-to-noise ratio at different positions according to an embodiment of the disclosure; fig. 4 is a schematic diagram of a detection success rate and a signal-to-noise ratio according to an embodiment of the present invention. In fig. 3, the modulation order M is 2, the false alarm probability PFA is 0.001, and the abscissa SNR is the signal-to-noise ratio. As can be seen from fig. 3, the curves without secret information and the curves with secret information have different trends, i.e., the standard deviation and the variation curve of the signal-to-noise ratio at different positions are different with or without secret information. When the SNR is 6, the curve without the secret information is located below the threshold curve, and the curve with the secret information is located above the threshold curve. Fig. 4 is a schematic diagram of a detection success rate and a signal-to-noise ratio for detecting the hidden information by using the detection method of the present invention, and it can be seen from fig. 4 that when the SNR > is 5.75dB, a curve with the hidden information is improved as the SNR increases, and a curve without the hidden information is kept unchanged as the SNR increases. Therefore, the detection method of the invention can accurately detect the secret information.
Referring to fig. 5 and fig. 6, fig. 5 is a schematic diagram of standard deviation and signal-to-noise ratio at different positions according to another embodiment of the disclosure; fig. 6 is a diagram illustrating another detection success rate and signal-to-noise ratio according to an embodiment of the disclosure. In fig. 5, the modulation order M is 4, the false alarm probability PFA is 0.001, and the abscissa SNR is the signal-to-noise ratio. As can be seen from fig. 5, the curves without secret information and the curves with secret information have different trends, i.e., the standard deviation and the variation curve of the signal-to-noise ratio at different positions are different with or without secret information. When the SNR is close to 12, the curve without the secret information is located below the threshold curve, and the curve with the secret information is located above the threshold curve. Fig. 6 is a schematic diagram of a detection success rate and a signal-to-noise ratio for detecting the hidden information by using the detection method of the present invention, and it can be seen from fig. 6 that when the SNR > is 11.3dB, a curve with the hidden information is improved as the SNR increases, and a curve without the hidden information is kept unchanged as the SNR increases. Therefore, the detection method of the invention can accurately detect the secret information.
Wherein, implementing the method described in fig. 2, the receiving device may receive the first bearer information after channel matching; carrying out relevant processing on the first carrier information to sequentially obtain second carrier information, original carrier information and third carrier information; comparing the second carrier information with the original carrier information and determining the position of the second carrier information different from the original carrier information; extracting a first value at said different location of said first carrier information and a second value at said different location of said third carrier information and determining a first standard deviation of the difference between said first value and said second value; judging whether the first standard deviation is larger than a preset threshold value or not; if yes, determining that the first carrier information contains secret information. Therefore, by implementing the embodiment of the present invention, the receiving device may perform relevant processing on the received first carrier information, sequentially obtain the second carrier information, the original carrier information, and the third carrier information, and further compare, analyze, and determine the first carrier information, the second carrier information, the original carrier information, and the third carrier information, so as to determine that the secret information exists in the first carrier information, thereby accurately detecting the secret information.
Referring to fig. 7, fig. 7 is a schematic structural diagram of an information detecting apparatus according to an embodiment of the present invention. The information detection apparatus described in fig. 7 may be configured to perform part or all of the steps in the information detection method based on the packet variance described in fig. 2, please refer to the related description in fig. 2, which is not described herein again. As shown in fig. 7, the information detecting apparatus may include:
a receiving unit 101, configured to receive the first bearer information after channel matching;
a processing unit 102, configured to perform relevant processing on the first carrier information, and sequentially obtain second carrier information, original carrier information, and third carrier information;
a comparison determination unit 103, configured to compare the second carrier information with the original carrier information, and determine a position where the second carrier information is different from the original carrier information;
an extraction determining unit 104 for extracting a first value at the different position of the first carrier information and a second value at the different position of the third carrier information, and determining a first standard deviation of a difference between the first value and the second value;
a determining unit 105, configured to determine whether the first standard deviation is greater than a preset threshold;
a determining unit 106, configured to determine that secret information exists in the first carrier information when the determining unit 105 determines that the first standard deviation is greater than the preset threshold.
Optionally, the comparison determining unit 103 is further configured to determine a position where the second carrier information is the same as the original carrier information;
the extraction determining unit 104 is further configured to extract a third value at the same position of the first carrier information and a fourth value at the same position of the third carrier information, and determine a second standard deviation of a difference between the third value and the fourth value;
the information detection apparatus further includes:
a determining unit 107, configured to determine the preset threshold according to the second standard deviation.
Optionally, the performing, by the processing unit 102, relevant processing on the first carrier information, and sequentially obtaining the second carrier information, the original carrier information, and the third carrier information includes:
demodulating the first carrier information to obtain second carrier information;
decoding and recoding the second carrier information to obtain original carrier information;
and re-modulating the original carrier information to obtain third carrier information.
Optionally, the determining unit 106 is further configured to determine that secret information does not exist in the first carrier information when the determining unit 105 determines that the first standard deviation is smaller than or equal to the preset threshold.
Wherein, implementing the information detection apparatus described in fig. 7, the first carrier information after channel matching can be received; carrying out relevant processing on the first carrier information to sequentially obtain second carrier information, original carrier information and third carrier information; comparing the second carrier information with the original carrier information and determining the position of the second carrier information different from the original carrier information; extracting a first value at said different location of said first carrier information and a second value at said different location of said third carrier information and determining a first standard deviation of the difference between said first value and said second value; judging whether the first standard deviation is larger than a preset threshold value or not; if yes, determining that the first carrier information contains secret information. Therefore, by implementing the embodiment of the present invention, the received first carrier information can be processed relatively, the second carrier information, the original carrier information, and the third carrier information are obtained in sequence, and further, the first carrier information, the second carrier information, the original carrier information, and the third carrier information are compared, analyzed, and determined, so as to determine that the secret information exists in the first carrier information, thereby being capable of accurately detecting the secret information.
The integrated unit implemented in the form of a software functional module may be stored in a computer readable storage medium. Wherein the computer readable storage medium may store a computer program which, when executed by a processor, may implement the steps of the above-described respective method embodiments. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable storage medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random-Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the contents contained in the computer-readable storage medium can be increased or decreased as appropriate according to the requirements of legislation and patent practice in the jurisdiction.
Referring to fig. 8, fig. 8 is a schematic structural diagram of a receiving device according to an embodiment of the present invention. The receiving device shown in fig. 8 includes a processor 801 and a memory 802. The processor 801 and the memory 802 are connected to a communication bus, respectively. The memory 802 may be a high-speed RAM memory or a non-volatile memory (non-volatile memory). Those skilled in the art will appreciate that the configuration of the receiving device shown in fig. 8 is not intended to limit the present invention, and may be a bus configuration, a star configuration, a combination of more or fewer components than those shown in fig. 8, or a different arrangement of components.
The processor 801 is a control center of the receiving device, and may be a Central Processing Unit (CPU), and the processor 801 connects various parts of the receiving device by using various interfaces and lines, and executes or executes software programs and/or modules stored in the memory 802 and calls program codes stored in the memory 802 to perform the following operations:
receiving the first carrier information after channel matching;
carrying out relevant processing on the first carrier information to sequentially obtain second carrier information, original carrier information and third carrier information;
comparing the second carrier information with the original carrier information and determining the position of the second carrier information different from the original carrier information;
extracting a first value at said different location of said first carrier information and a second value at said different location of said third carrier information and determining a first standard deviation of the difference between said first value and said second value;
judging whether the first standard deviation is larger than a preset threshold value or not;
if yes, determining that the first carrier information contains secret information.
As an alternative embodiment, the processor 801 may also call the program code stored in the memory 802 to perform the following operations:
determining the position of the second carrier information which is the same as the original carrier information;
extracting a third value at said same position of said first carrier information and a fourth value at said same position of said third carrier information and determining a second standard deviation of the difference of said third value and said fourth value;
and determining the preset threshold according to the second standard deviation.
As an optional implementation manner, the performing correlation processing on the first carrier information to sequentially obtain second carrier information, original carrier information, and third carrier information includes:
demodulating the first carrier information to obtain second carrier information;
decoding and recoding the second carrier information to obtain original carrier information;
and re-modulating the original carrier information to obtain third carrier information.
As an alternative embodiment, the processor 801 may also call the program code stored in the memory 802 to perform the following operations:
and if the first standard deviation is smaller than or equal to the preset threshold, determining that the first carrier information does not have the secret information.
In the receiving apparatus depicted in fig. 8, the first bearer information after channel matching is received; carrying out relevant processing on the first carrier information to sequentially obtain second carrier information, original carrier information and third carrier information; comparing the second carrier information with the original carrier information and determining the position of the second carrier information different from the original carrier information; extracting a first value at said different location of said first carrier information and a second value at said different location of said third carrier information and determining a first standard deviation of the difference between said first value and said second value; judging whether the first standard deviation is larger than a preset threshold value or not; if yes, determining that the first carrier information contains secret information. Therefore, by implementing the embodiment of the present invention, the receiving device may perform relevant processing on the received first carrier information, sequentially obtain the second carrier information, the original carrier information, and the third carrier information, and further compare, analyze, and determine the first carrier information, the second carrier information, the original carrier information, and the third carrier information, so as to determine that the secret information exists in the first carrier information, thereby accurately detecting the secret information.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one type of division of logical functions, and there may be other divisions when actually implementing, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of some interfaces, devices or units, and may be an electric or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable memory. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a memory and includes several instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned memory comprises: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable memory, which may include: flash Memory disks, Read-Only memories (ROMs), Random Access Memories (RAMs), magnetic or optical disks, and the like.
The packet variance-based information detection method, apparatus and receiving device disclosed in the embodiments of the present invention are described in detail above, and a specific example is applied in the present document to explain the principle and implementation manner of the present invention, and the description of the above embodiments is only used to help understanding the method and core ideas of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (6)
1. An information detection method based on packet variance is characterized by comprising the following steps:
receiving the first carrier information after channel matching;
carrying out relevant processing on the first carrier information to sequentially obtain second carrier information, original carrier information and third carrier information;
comparing the second carrier information with the original carrier information and determining the position of the second carrier information different from the original carrier information;
extracting a first value at said different location of said first carrier information and a second value at said different location of said third carrier information and determining a first standard deviation of the difference between said first value and said second value;
judging whether the first standard deviation is larger than a preset threshold value or not;
if yes, determining that the first carrier information contains secret information,
wherein the method further comprises: determining the position of the second carrier information which is the same as the original carrier information; extracting a third value at said same position of said first carrier information and a fourth value at said same position of said third carrier information and determining a second standard deviation of the difference of said third value and said fourth value; determining the preset threshold according to the second standard deviation, wherein the performing the relevant processing on the first carrier information and sequentially obtaining the second carrier information, the original carrier information and the third carrier information includes: demodulating the first carrier information to obtain second carrier information; decoding and recoding the second carrier information to obtain original carrier information; and re-modulating the original carrier information to obtain third carrier information.
2. The method of claim 1, further comprising:
and if the first standard deviation is smaller than or equal to the preset threshold, determining that the first carrier information does not have the secret information.
3. An information detecting apparatus, characterized by comprising:
a receiving unit, configured to receive the first carrier information after channel matching;
the processing unit is used for carrying out relevant processing on the first carrier information and sequentially obtaining second carrier information, original carrier information and third carrier information;
a comparison determination unit, configured to compare the second carrier information with the original carrier information, and determine a position where the second carrier information is different from the original carrier information;
an extraction determination unit configured to extract a first value at the different position of the first carrier information and extract a second value at the different position of the third carrier information, and determine a first standard deviation of a difference between the first value and the second value;
the judging unit is used for judging whether the first standard deviation is larger than a preset threshold value or not;
a determination unit configured to determine that the secret information exists in the first carrier information when the determination unit determines that the first standard deviation is larger than the preset threshold,
the comparison determining unit is further configured to determine a position where the second carrier information is the same as the original carrier information; the extraction determination unit is further configured to extract a third numerical value at the same position of the first carrier information and a fourth numerical value at the same position of the third carrier information, and determine a second standard deviation of a difference between the third numerical value and the fourth numerical value; the information detection apparatus further includes: a determining unit, configured to determine the preset threshold according to the second standard deviation, where the processing unit performs related processing on the first carrier information, and sequentially obtaining second carrier information, original carrier information, and third carrier information includes: demodulating the first carrier information to obtain second carrier information; decoding and recoding the second carrier information to obtain original carrier information; and re-modulating the original carrier information to obtain third carrier information.
4. The information detection apparatus according to claim 3, wherein the determination unit is further configured to determine that the covert information is not present in the first carrier information when the determination unit determines that the first standard deviation is less than or equal to the preset threshold.
5. A receiving device, characterized in that the receiving device comprises a processor and a memory, the processor executing a computer program stored by the memory to implement the packet variance based information detection method according to any one of claims 1 to 2.
6. A computer-readable storage medium storing at least one instruction which, when executed by a processor, implements the packet variance based information detection method according to any one of claims 1 to 2.
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| CN109271855B (en) * | 2018-08-09 | 2021-07-09 | 深圳市永达电子信息股份有限公司 | Method for extracting characteristics of industrial control signals |
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