WO2019095177A1

WO2019095177A1 - Information detection method and apparatus based on packet variance, and receiving device

Info

Publication number: WO2019095177A1
Application number: PCT/CN2017/111218
Authority: WO
Inventors: 谢宁; 谭杰
Original assignee: 深圳大学
Priority date: 2017-11-15
Filing date: 2017-11-15
Publication date: 2019-05-23

Abstract

Disclosed is an information detection method based on a packet variance. The method comprises: receiving first carrier information after channel matching; carrying out related processing on the first carrier information to obtain second carrier information, original carrier information and third carrier information in sequence; comparing the second carrier information with the original carrier information, and determining different positions of the second carrier information and the original carrier information; extracting a first numerical value on the different positions of the first carrier information and extracting a second numerical value on the different positions of the third carrier information, and determining a first standard deviation of a difference value of the first numerical value and the second numerical value; determining whether the first standard deviation is greater than a pre-set threshold; and if so, determining that concealed information exists in the first carrier information. By means of the embodiments of the present invention, concealed information can be detected accurately.

Description

Information detection method, device and receiving device based on group variance

Technical field

The present invention relates to the field of communications technologies, and in particular, to an information detection method, apparatus, and receiving apparatus based on group variance.

Background technique

Substitute steganography means that the original information is embedded in the secret information after channel coding, and the secret information is directly replaced with the original part information to achieve the purpose of information hiding.

At present, in the steganalysis technique, the chi-square detection method is the earliest detection algorithm for the detection of Least Significant Bit (LSB) steganography, which tests the image by defining a chi-square statistic. The probability of statistical characteristics enables detection of sequential LSB replacement, but does not detect LSB replacement at random locations. The detection algorithm for LSB matching basically adopts methods such as neural network and pattern recognition. The feature set is trained to extract effective features, and then the joint information of multiple features is used to detect the hidden information. However, these methods are computationally intensive. The test results are not precise enough and have limitations.

Summary of the invention

The embodiment of the invention discloses a method, a device and a receiving device for detecting information based on group variance, which can accurately detect the secret information.

The first aspect of the embodiments of the present invention discloses a method for detecting information based on group variance, including:

Receiving, by the channel, the first carrier information;

Performing related processing on the first carrier information, and sequentially obtaining second carrier information, original carrier information, and third carrier information;

Comparing the second carrier information with the original carrier information, and determining a location of the second carrier information different from the original carrier information;

Extracting a first value at the different location of the first carrier information and extracting the first a second value at the different locations of the three carrier information, and determining a first standard deviation of the difference between the first value and the second value;

Determining whether the first standard deviation is greater than a preset threshold;

If yes, it is determined that the secret information exists in the first carrier information.

As an optional implementation manner, in the first aspect of the embodiments of the present invention, the method further includes:

Determining a location of the second carrier information that is the same as the original carrier information;

Extracting a third value at the same location of the first carrier information and extracting a fourth value at the same location of the third carrier information, and determining the third value and the fourth value a second standard deviation of the difference in values;

The preset threshold is determined according to the second standard deviation.

As an optional implementation manner, in the first aspect of the embodiment of the present invention, the performing, by the related processing on the first carrier information, 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 re-encoding the second carrier information to obtain original carrier information;

The original carrier information is remodulated to obtain third carrier information.

If the first standard deviation is less than or equal to the preset threshold, determining that there is no secret information in the first carrier information.

A second aspect of the embodiments of the present invention discloses an information detecting apparatus, including:

a receiving unit, configured to receive the first carrier information that is matched by the channel;

a processing unit, configured to perform correlation processing on the first carrier information, and sequentially obtain second carrier information, original carrier information, and third carrier information;

a comparison determining unit, configured to compare the second carrier information with the original carrier information, and Determining a location of the second carrier information different from the original carrier information;

An extraction determining 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 the first a first standard deviation of the difference between the value and the second value;

a determining unit, configured to determine whether the first standard deviation is greater than a preset threshold;

And a determining unit, configured to determine that the first carrier information is greater than the preset threshold when determining that the first standard deviation is greater than the preset threshold.

As an optional implementation manner, in a second aspect of the embodiment of the present invention, the comparison determining unit is further configured to determine a location where the second carrier information is the same as the original carrier information;

The extraction determining unit is further configured to extract a third value on the same location of the first carrier information and extract a fourth value on the same location of the third carrier information, and determine a second standard deviation of the difference between the third value and the fourth value;

The information detecting apparatus further includes:

a determining unit, configured to determine the preset threshold according to the second standard deviation.

As an optional implementation manner, in a second aspect of the embodiments of the present invention, the processing unit performs related processing on the first carrier information, and sequentially obtains second carrier information, original carrier information, and third carrier information, including :

As an optional implementation manner, in the second aspect of the embodiment of the present invention, the determining unit is further configured to: when the determining unit determines that the first standard deviation is less than or equal to the preset threshold, determining There is no secret information in the first carrier information.

A third aspect of the embodiments of the present invention discloses a receiving device, where the receiving device includes a processor and a memory, and the processor executes the computer program stored in the memory to implement the group variance based on any one of the foregoing first aspects. Information detection method.

A computer readable storage medium storing at least one instruction, the at least one instruction being executed by a processor to implement the group variance based information detection method of any of the above first aspects.

Compared with the prior art, the embodiment of the invention has the following beneficial effects:

In the embodiment of the present invention, the receiving device may receive the first carrier information that is matched by the channel, perform related processing on the first carrier information, and obtain the second carrier information, the original carrier information, and the third carrier information in sequence; a second carrier information and the original carrier information, and determining a location of the second carrier information different from the original carrier information; extracting a first value at the different location of the first carrier information and extracting a location Determining a second value at the different position of the third carrier information, and determining a first standard deviation of the difference between the first value and the second value; determining whether the first standard deviation is greater than a preset a threshold; if yes, determining that there is secret information in the first carrier information. It can be seen that, in the embodiment of the present invention, the receiving device may perform related processing on the received first carrier information, and sequentially obtain the second carrier information, the original carrier information, and the third carrier information, and further, the first carrier information and the second The carrier information, the original carrier information, and the third carrier information are compared and analyzed to determine that the secret information exists in the first carrier information, so that the secret information can be accurately detected.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

1 is a diagram of a communication model for replacing steganography disclosed in an embodiment of the present invention;

2 is a schematic flow chart of a method for detecting information based on group variance according to an embodiment of the present invention;

3 is a schematic diagram of standard deviation and signal to noise ratio at different positions according to an embodiment of the present invention;

4 is a schematic diagram of a detection success rate and a signal to noise ratio according to an embodiment of the present invention;

5 is a schematic diagram of standard deviation and signal to noise ratio at another different position disclosed in an embodiment of the present invention;

6 is a schematic diagram of another detection success rate and a signal to noise ratio according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of an information detecting apparatus according to an embodiment of the present invention; FIG.

FIG. 8 is a schematic structural diagram of a receiving device according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. 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 obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

It should be noted that the terms "first", "second", "third", "fourth" and the like in the specification and claims of the present invention and the above drawings are used to distinguish different objects instead of To describe a specific order. Furthermore, the terms "comprises" and "comprising" and "comprising" are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device that comprises a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units not listed, or alternatively Other steps or units inherent to these processes, methods, products or equipment.

The embodiment of the invention discloses a method, a device and a receiving device for detecting information based on group variance, which can accurately detect the secret information. The details are described below in conjunction with the drawings.

Please refer to FIG. 1. FIG. 1 is a diagram of a communication model for replacing steganography disclosed in an embodiment of the present invention. As shown in FIG. 1, the alternative steganographic communication model can include two processes: a transmitting process and a receiving process.

The sending process is mainly performed by the sending device. The sending device may include a base station or a user equipment. A base station (eg, an access point) may refer to an access network that passes through an air interface. Or a device that communicates with a wireless terminal in multiple sectors. The base station can be used to convert the received air frame to the IP packet as a router between the wireless terminal and the rest of the access network, wherein the remainder of the access network can include an Internet Protocol (IP) network. The base station can also coordinate attribute management of the air interface. For example, the base station may be a base station (BTS, Base Transceiver Station) in GSM or CDMA, or may be a base station (NodeB) in WCDMA, or may be an evolved base station in LTE (NodeB or eNB or e-NodeB, evolutional Node B), the embodiment of the present invention is not limited. User equipment 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 (such as a smart watch). Various types of electronic devices, such as smart bracelets and smart glasses, wherein the 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, and a BlackBerry operating system. The Windows Phone 8 operating system and the like are not limited in the embodiment of the present invention.

In the transmission process, the transmitting device is divided into two paths, one is that the carrier information is encoded, and the other is that the secret information is encoded. After the two are encoded, the secret information is embedded in the carrier information, modulated, and then sent to the channel. The channel is sent to the receiving device.

The receiving process is mainly performed by the receiving device. The receiving device may include a base station or a user equipment. A base station (e.g., an access point) can refer to a device in an access network that communicates with a wireless terminal over one or more sectors over an air interface. The base station can be used to convert the received air frame to the IP packet as a router between the wireless terminal and the rest of the access network, wherein the remainder of the access network can include an Internet Protocol (IP) network. The base station can also coordinate attribute management of the air interface. For example, the base station may be a base station (BTS, Base Transceiver Station) in GSM or CDMA, or may be a base station (NodeB) in WCDMA, or may be an evolved base station in LTE (NodeB or eNB or e-NodeB, evolutional Node B), the embodiment of the present invention is not limited. User equipment 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 (such as a smart watch). , smart bracelets, smart glasses, and other electronic devices, wherein the operating system of the user device can be packaged The embodiments of the present invention are not limited, but are not limited to the Android operating system, the IOS operating system, the Symbian operating system, the Blackberry operating system, the Windows Phone 8 operating system, and the like.

In the receiving process, after the receiving device demodulates the received signal, the demodulated signal is extracted and then decoded to obtain the secret information, and then the signal after the secret information is extracted is decoded to obtain the carrier information.

Specifically, the specific embedding method of the secret information may be BINARY PHASE SHIFT KEYING (BPSK) as an example. The carrier information is encoded into 0, 1 sequence, and the secret information is also 0, 1 sequence. Then, the secret information can randomly replace some positions of the carrier information to hide the information. At this time, the carrier information 0 can be replaced by the secret information 1, and the carrier information 1 can be replaced by the secret information 0, after BPSK is - 1 changes to 1, 1 changes to -1. Of course, in order to ensure that the original carrier information can be restored later, the number of bits of the secret information needs to be smaller than the number of bits that can be corrected by the error correction capability of the carrier information. For example, suppose that the encoded information bits have k bits, for a total of n symbols, then the number of bits that can be corrected

Take an integer, so the number of bits of the secret information is less than t in order to replace the steganography.

Please refer to FIG. 2. FIG. 2 is a schematic flowchart of a method for detecting information based on group variance according to an embodiment of the present invention. As shown in FIG. 2, the packet variance based information detecting method may include the following steps:

Step 201: The receiving device receives the first carrier information that is matched by the channel.

In the present invention, the transmitting device transmits the first bearer information after the steganography is replaced, and the receiving device can receive the first bearer information from the channel, wherein the first bearer information is the coded and modulated information. Wherein, the channel is a fading channel, that is, a channel whose channel fades with distance, and if the distance is constant, the channel is constant.

Among them, the formula for channel matching is as follows:

Where Y is the carrier information after multiplying channel H, conj(H) is the conjugate of H, noise is noise, and Y1 is the first carrier information.

Step 202: The receiving device performs related processing on the first carrier information, and sequentially obtains second carrier information, original carrier information, and third carrier information.

In the present invention, the manner in which the receiving device performs related processing on the first carrier information, and sequentially obtains the second carrier information, the original carrier information, and the third carrier information may be specifically:

In the present invention, by decoding the second carrier information, the hidden information that may be hidden in the second carrier information can be erased, and after re-encoding, the original carrier information can be obtained. The first carrier information may include secret information, and the third carrier information does not include secret information.

Step 203: The receiving device compares the second carrier information with the original carrier information, and determines a location 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 each represented by a multi-bit value (such as 0, 1). The receiving device can compare the second carrier information with the original carrier information to determine the same location and different locations of the second carrier information as the original carrier information. For example, if the second carrier information is 00, the original carrier information is 01, and the second carrier information and the original carrier information are in the same position, the second carrier information and the The original carrier information has a different position in the second place.

Step 204: The receiving device extracts a first value on the different location of the first carrier information, and extracts a second value on the different location of the third carrier information, and determines the first value. a first standard deviation of the difference from the second value.

In the present invention, after determining that the second carrier information is different from the original carrier information, the receiving device extracts a first value at the different location of the first carrier information and extracts the third carrier a second value at the different locations of the information, for example: hypothetical The second carrier information is the same as the original carrier information, and the second carrier information is different from the original carrier information, and the receiving device may extract the first carrier information. a first value on the second bit and a second value on the second bit of the third carrier information.

Further, the receiving device may determine a first standard deviation of the difference between the first value and the second value.

Step 205: The receiving device determines whether the first standard deviation is greater than a preset threshold. If yes, go to step 206. If no, go to step 207.

As an optional implementation manner, the method further includes the following steps:

11) determining a location where the second carrier information is the same as the original carrier information;

12) extracting a third value at the same position of the first carrier information and extracting a fourth value at the same position of the third carrier information, and determining the third value and the a second standard deviation of the difference of the fourth value;

13) determining the preset threshold according to the second standard deviation.

In the optional implementation, when comparing the second carrier information with the original carrier information, the receiving device may further determine the location of the second carrier information and the original carrier information, thereby extracting the a third value at the same position of the first carrier information and a fourth value at the same position at which the third carrier information is extracted, and determining a difference between the third value and the fourth value The second standard deviation of the value. For example, if the second carrier information is the same as the original carrier information, and the second carrier information is different from the original carrier information, the receiving device may extract a third value on the first bit of the first carrier information and a fourth value on the first bit of the third carrier information. Further, the receiving device may determine the third value and the fourth value. The second standard deviation of the difference in values.

Further, the receiving device may determine the preset threshold according to the second standard deviation. The preset threshold can be determined by referring to the following formula:

Where T ⁰ is the preset threshold, Ф is the 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, and PFA is the false alarm probability. The false alarm probability can be understood as the probability that the first carrier information in which the secret information does not exist is determined as the first carrier information in which the secret information exists. The preset threshold can be determined by limiting the false alarm probability and maximizing the detection rate of the secret information.

Step 206: The receiving device determines that there is hidden information in the first carrier information, and ends the process.

Step 207: The receiving device determines that there is no secret information in the first carrier information.

Please refer to FIG. 3 and FIG. 4 together. FIG. 3 is a schematic diagram of standard deviation and signal to noise ratio at different positions according to an embodiment of the present invention; FIG. 4 is a detection success rate and a letter disclosed in the embodiment of the present invention. Schematic diagram of the noise ratio. In FIG. 3, the modulation order M=2, the false alarm probability PFA=0.001, and the abscissa SNR is the signal to noise ratio. As can be seen from Fig. 3, the trend of the curve without hidden information and the curve with hidden information is different, that is, there is no hidden information, and the standard deviation and signal-to-noise ratio curves at different positions are different. When SNR = 6, the curve without hidden information is below the threshold curve, and the curve with hidden information is above the threshold curve. 4 is a schematic diagram showing the detection success rate and the signal-to-noise ratio of the secret information by using the detection method of the present invention. As can be seen from FIG. 4, when the SNR>=5.75 dB, the curve with the secret information follows the SNR. Increase and increase, while the curve without hidden information remains unchanged as the SNR increases. Thus, the detection information of the present invention can accurately detect the secret information.

Referring to FIG. 5 and FIG. 6 together, FIG. 5 is a schematic diagram of another standard position difference and signal to noise ratio disclosed in an embodiment of the present invention; FIG. 6 is another detection success rate disclosed in the embodiment of the present invention. Schematic diagram with signal to noise ratio. In FIG. 5, the modulation order M=4, the false alarm probability PFA=0.001, and the horizontal coordinate SNR is the signal to noise ratio. As can be seen from Fig. 5, the trend of the curve without hidden information and the curve with hidden information is different, that is, whether there is hidden information, and the standard deviation and signal-to-noise ratio curves at different positions are different. When the SNR is close to 12, the curve without hidden information is below the threshold curve, and the curve with hidden information is above the threshold curve. Figure 6 is a view of the use of the present invention The detection method is used to detect the detection success rate of the secret information and the signal-to-noise ratio curve. As can be seen from Fig. 6, when the SNR>=11.3dB, the curve with the secret information increases with the increase of the SNR, and no The curve of the secret information remains unchanged as the SNR increases. Thus, the detection information of the present invention can accurately detect the secret information.

The method described in FIG. 2 is implemented, the receiving device may receive the first carrier information that is matched by the channel, and perform related processing on the first carrier information, and sequentially obtain the second carrier information, the original carrier information, and the third carrier information. Comparing the second carrier information with the original carrier information, and determining a location of the second carrier information different from the original carrier information; extracting the first location at the different location of the first carrier information And determining a second value at the different position of the third carrier information, and determining a first standard deviation of the difference between the first value and the second value; determining the first standard deviation Whether it is greater than a preset threshold; if yes, determining that there is secret information in the first carrier information. It can be seen that, in the embodiment of the present invention, the receiving device may perform related processing on the received first carrier information, and sequentially obtain the second carrier information, the original carrier information, and the third carrier information, and further, the first carrier information and the second The carrier information, the original carrier information, and the third carrier information are compared and analyzed to determine that the secret information exists in the first carrier information, so that the secret information can be accurately detected.

Please refer 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 detecting apparatus described in FIG. 7 may be used to perform some or all of the steps in the packet variance-based information detecting method described in FIG. 2 . For details, refer to the related description in FIG. 2 , and details are not described herein again. As shown in FIG. 7, the information detecting apparatus may include:

The receiving unit 101 is configured to receive the first carrier information that is matched by the channel;

The processing unit 102 is configured to perform correlation processing on the first carrier information, and sequentially obtain second carrier information, original carrier information, and third carrier information;

The comparison determining unit 103 is configured to compare the second carrier information with the original carrier information, and determine a location where the second carrier information is different from the original carrier information;

An extraction determining unit 104, configured to extract the different locations of the first carrier information a first value and a second value at the different position of the third carrier information, and determining a first standard deviation of the difference between the first value and the second value;

The determining unit 105 is configured to determine whether the first standard deviation is greater than a preset threshold;

The determining unit 106 is configured to determine that the 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 that the second carrier information is the same location as the original carrier information;

The extraction determining unit 104 is further configured to extract a third value on the same location of the first carrier information and extract a fourth value on the same location of the third carrier information, and determine a second standard deviation of the difference between the third value and the fourth value;

The information detecting apparatus further includes:

The determining unit 107 is configured to determine the preset threshold according to the second standard deviation.

Optionally, the processing unit 102 performs related processing on the first carrier information, and sequentially obtains the second carrier information, the original carrier information, and the third carrier information, including:

Optionally, the determining unit 106 is further configured to: when the determining unit 105 determines that the first standard deviation is less than or equal to the preset threshold, determine that there is no secret information in the first carrier information.

The information detecting apparatus described in FIG. 7 can receive the first carrier information that is matched by the channel, and perform related processing on the first carrier information, and sequentially obtain the second carrier information, the original carrier information, and the third carrier information. Comparing the second carrier information with the original carrier information, and determining a location of the second carrier information different from the original carrier information; extracting the first location at the different location of the first carrier information And determining a second value at the different position of the third carrier information, and determining a first standard deviation of the difference between the first value and the second value; determining the first standard deviation Whether it is greater than a preset threshold; if yes, determining the first load There is hidden information in the body information. It can be seen that, in the embodiment of the present invention, the received first carrier information may be processed in association, and the second carrier information, the original carrier information, and the third carrier information are sequentially obtained, and further, the first carrier information and the second carrier information are obtained. The original carrier information and the third carrier information are compared and analyzed to determine that there is hidden information in the first carrier information, so that the secret information can be accurately detected.

The above-described integrated unit implemented in the form of a software function module can be stored in a computer readable storage medium. Wherein, the computer readable storage medium can store a computer program, which when executed by the processor, can implement the steps in the foregoing method embodiments. Wherein, the computer program comprises computer program code, which may be in the form of source code, object code form, executable file or some intermediate form. The computer readable storage medium may include any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a removable hard disk, a magnetic disk, an optical disk, a computer memory, a read only memory (ROM, Read-Only Memory). ), random access memory (RAM, Random-Access Memory), electrical carrier signals, telecommunications signals, and software distribution media. It should be noted that the content contained in the computer readable storage medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in a jurisdiction.

Please refer 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 respectively connected to the communication bus. The memory 802 may be a high speed RAM memory or a non-volatile memory. It will be understood by those skilled in the art that the structure of the receiving device shown in FIG. 8 does not constitute a limitation of the present invention, and it may be a bus-shaped structure or a star-shaped structure, and may further include more than that shown in FIG. More or less parts, or some parts, or different parts.

The processor 801 is a control center of the receiving device, and may be a central processing unit (CPU). The processor 801 connects various parts of the entire receiving device by using various interfaces and lines, and is stored in the memory 802 by running or executing. Software programs and/or modules within, as well as calling program code stored in memory 802 for performing the following operations:

Receiving, by the channel, the first carrier information;

Extracting a first value at the different location of the first carrier information and extracting a second value at the different location of the third carrier information, and determining the first value and the second The first standard deviation of the difference in values;

As an optional implementation manner, the processor 801 may also call program code stored in the memory 802 for performing the following operations:

The preset threshold is determined according to the second standard deviation.

As an optional implementation manner, the performing, by the related processing on the first carrier information, sequentially obtaining the second carrier information, the original carrier information, and the third carrier information includes:

In the receiving device described in FIG. 8, receiving the first carrier information after channel matching; Performing related processing on the first carrier information, sequentially obtaining second carrier information, original carrier information, and third carrier information; comparing the second carrier information with the original carrier information, and determining the second carrier information and the a different location of the original carrier information; extracting a first value at the different location of the first carrier information and extracting a second value at the different location of the third carrier information, and determining the number a first standard deviation of a difference between the value and the second value; determining whether the first standard deviation is greater than a preset threshold; if yes, determining that the first carrier information has secret information. It can be seen that, in the embodiment of the present invention, the receiving device may perform related processing on the received first carrier information, and sequentially obtain the second carrier information, the original carrier information, and the third carrier information, and further, the first carrier information and the second The carrier information, the original carrier information, and the third carrier information are compared and analyzed to determine that the secret information exists in the first carrier information, so that the secret information can be accurately detected.

In the above embodiments, the descriptions of the various embodiments are different, and the details that are not detailed in a certain embodiment can be referred to the related descriptions of other embodiments.

In the several embodiments provided herein, it should be understood that the disclosed apparatus may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or may be Integrate into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical or otherwise.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the 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 standalone product, may be stored in a computer readable memory. Based on such understanding, the technical solution of the present invention may contribute to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a memory. A number of instructions are included to cause a computer device (which may be a personal computer, server or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing memory includes: a U disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk, and the like, which can store program codes.

A person skilled in the art can understand that all or part of the steps of the foregoing embodiments can be completed by a program to instruct related hardware, and the program can be stored in a computer readable memory, and the memory can include: a flash drive , read-only memory (English: Read-Only Memory, referred to as: ROM), random accessor (English: Random Access Memory, referred to as: RAM), disk or CD.

The method and device for detecting information based on group variance are disclosed in detail in the above embodiments of the present invention. The principles and implementations of the present invention are described in the following examples. The description of the above embodiments is only The method for understanding the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in specific embodiments and application scopes. The description should not be construed as limiting the invention.

Claims

An information detection method based on group variance, which is characterized in that it comprises:

Receiving, by the channel, the first carrier information;

Performing related processing on the first carrier information, and sequentially obtaining second carrier information, original carrier information, and third carrier information;

Comparing the second carrier information with the original carrier information, and determining a location of the second carrier information different from the original carrier information;

Extracting a first value at the different location of the first carrier information and extracting a second value at the different location of the third carrier information, and determining the first value and the second The first standard deviation of the difference in values;

Determining whether the first standard deviation is greater than a preset threshold;

If yes, it is determined that the secret information exists in the first carrier information.
The method of claim 1 further comprising:

Determining a location of the second carrier information that is the same as the original carrier information;

Extracting a third value at the same location of the first carrier information and extracting a fourth value at the same location of the third carrier information, and determining the third value and the fourth value a second standard deviation of the difference in values;

The preset threshold is determined according to the second standard deviation.
The method according to claim 2, wherein the performing the correlation processing on the first carrier information, and sequentially obtaining the second carrier information, the original carrier information, and the third carrier information comprises:

Demodulating the first carrier information to obtain second carrier information;

Decoding and re-encoding the second carrier information to obtain original carrier information;

The original carrier information is remodulated to obtain third carrier information.
Method according to any one of claims 1 to 3, characterized in that the method further comprises include:

If the first standard deviation is less than or equal to the preset threshold, determining that there is no secret information in the first carrier information.
An information detecting apparatus, comprising:

a receiving unit, configured to receive the first carrier information that is matched by the channel;

a processing unit, configured to perform correlation processing on the first carrier information, and sequentially obtain second carrier information, original carrier information, and third carrier information;

a comparison determining unit, configured to compare the second carrier information with the original carrier information, and determine a location of the second carrier information different from the original carrier information;

An extraction determining 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 the first a first standard deviation of the difference between the value and the second value;

a determining unit, configured to determine whether the first standard deviation is greater than a preset threshold;

And a determining unit, configured to determine that the first carrier information is greater than the preset threshold when determining that the first standard deviation is greater than the preset threshold.
The information detecting apparatus according to claim 5, wherein the comparison determining unit is further configured to determine a location where the second carrier information is the same as the original carrier information;

The extraction determining unit is further configured to extract a third value on the same location of the first carrier information and extract a fourth value on the same location of the third carrier information, and determine a second standard deviation of the difference between the third value and the fourth value;

The information detecting apparatus further includes:

a determining unit, configured to determine the preset threshold according to the second standard deviation.
The information detecting apparatus according to claim 6, wherein the processing unit performs correlation processing on the first carrier information, and sequentially obtains second carrier information and original carrier information. And the third carrier information includes:

Demodulating the first carrier information to obtain second carrier information;

Decoding and re-encoding the second carrier information to obtain original carrier information;

The original carrier information is remodulated to obtain third carrier information.
The information detecting apparatus according to any one of claims 5 to 7, wherein the determining unit is further configured to: when the determining unit determines that the first standard deviation is less than or equal to the preset threshold, It is determined that there is no secret information in the first carrier information.
A receiving device, comprising: a processor and a memory, the processor executing a computer program stored in the memory to implement group variance-based information according to any one of claims 1 to Detection method.
A computer readable storage medium, characterized in that the computer readable storage medium stores at least one instruction, the at least one instruction being executed by a processor to implement the grouping according to any one of claims 1 to Information detection method for variance.