WO2021102687A1

WO2021102687A1 - Communication encryption method and system

Info

Publication number: WO2021102687A1
Application number: PCT/CN2019/120974
Authority: WO
Inventors: 韩性峰
Original assignee: 深圳瀚飞科技开发有限公司
Priority date: 2019-11-26
Filing date: 2019-11-26
Publication date: 2021-06-03

Abstract

Provided are a communication encryption method and system. The communication encryption method comprises: a data sending step: when a normal data packet is sent, randomly sending a scramble packet according to a sending rule, wherein the scramble packet has a flag bit, the data format of the scramble packet is the same as the data format of the normal data packet, but instruction data of the scramble packet is erroneous; and a data receiving step: detecting the scramble packet by means of identifying the flag bit of the scramble packet; if a counter does not reach the maximum value and after the scramble packet is received, executing a processing step and the counter automatically resetting to zero; and if the counter reaches the maximum value and the scramble packet is still not detected, performing interference processing. The beneficial effects of the present invention involve: a pirate generally focuses on the structure of each packet of data, while overlooking the situation when the state of each packet of data is switched, and takes a scramble packet as normal data; moreover, the scramble packet is random and fast, thereby greatly increasing the privacy of encryption and greatly disrupting the pirate.

Description

Communication encryption method and system

Technical field

The present invention relates to the technical field of communication encryption, in particular to a communication encryption method and system.

Background technique

Nowadays, the application of wireless technology is developing rapidly, and it may replace wired communication as the mainstream in the future. The security of communication is also a standard to measure the pros and cons of a communication method, so it is particularly important to innovate the encryption method of communication protocol. At present, the more conventional communication method is to add any number of check codes or positive and negative codes on the basis of the custom data packet protocol, but through the comparison and decoding of big data, the security of this typical encryption method is not yet the best.

Summary of the invention

technical problem

The solution to the problem

Technical solutions

The present invention provides a communication encryption method, including a data sending step and a data receiving step,

The data sending step: when sending a normal data packet, randomly send the scrambled packet according to the sending rules, the scrambled packet has a flag bit, the data format of the scrambled packet is the same as the data format of the normal data packet, but the instruction data of the scrambled packet is Incorrect;

The data receiving step: detect the scrambled packet by identifying the flag bit of the scrambled packet, and determine whether the counter has reached the maximum value. If the counter has not reached the maximum value and the scrambled packet is received, the processing steps are executed and the counter is automatically cleared. ; If the counter reaches the maximum value, and there is still no interference packet detected, then the interference processing is performed; the counter matches the sending rule;

Processing steps: processing the disturbed packet, so as to correctly identify the normal data.

As a further improvement of the present invention, compared with the flag bit of the normal data packet, the flag bit of the scrambled packet has the same level, but the level width of the two is different; in the data receiving step, the electrical level of the flag bit is judged. Flat width to identify disturbing packets.

As a further improvement of the present invention, in the data sending step, the normal data packet state switching times are recorded by the transmitting end data state switching counter, and the scrambled packet is randomly sent within the set normal data packet state switching times, and the scrambled packet has a mark Bit, the data format of the scrambled packet is the same as the data format of the normal data packet, but the command data of the scrambled packet is wrong;

In the data receiving step, the counter is a data state switching counter at the receiving end, the scrambled packet is detected by identifying the flag bit of the scrambled packet, and it is judged whether the data state switching counter at the receiving end has reached the maximum value, if the data state switching at the receiving end After the counter has not reached the maximum value and the scrambled packet is received, the processing steps are executed, and the data state switching counter at the receiving end is automatically cleared; if the data state switching counter at the receiving end reaches the maximum value, the scrambled packet is still not detected, then interference deal with;

Among them, the normal data packet state switching times set by the transmitting end data state switching counter are the same as the maximum value set by the receiving end data state switching counter.

As a further improvement of the present invention, in the data receiving step, the interference processing includes stopping or outputting an error instruction, and outputting an error instruction so as to cause confusion in operation.

As a further improvement of the present invention, in the processing step, the scrambled packet is deleted or the scrambled packet is not read.

As a further improvement of the present invention, in the data sending step, the normal data packet is changed according to the set rule, thereby turning the normal data packet into a scrambled packet; in the processing step, the scrambled packet is changed according to the set rule Make changes to turn the disturbed packet into a normal data packet.

As a further improvement of the present invention, in the data sending step, the encryption mode is determined by the flag bit width of the scrambled packet. Different flag bit widths of the scrambled packet represent different encryption methods, and the normal data packet is changed according to the corresponding encryption method. Into a scrambled packet;

In the data receiving step, the decryption mode is determined by the flag bit width of the scrambled packet, and the flag bit widths of different scrambled packets represent different decryption methods. In the processing step, the scrambled packet is changed into Normal data packet.

The present invention also provides a communication encryption system, including a data sending module and a data receiving module. The data sending module is used to randomly send a scrambled packet according to the sending rules when sending a normal data packet, and the scrambled packet has a flag bit. , The data format of the scrambled packet is the same as that of the normal data packet, but the command data of the scrambled packet is wrong;

The data receiving module is used to detect the scrambled packet by identifying the flag bit of the scrambled packet, and determine whether the counter has reached the maximum value. If the counter does not reach the maximum value and the scrambled packet is received, the processing module is executed and the counter is automatically Cleared to zero; if the counter reaches the maximum value and there is still no interference packet detected, then the interference processing is performed; the counter matches the sending rule;

Processing module: used to process disturbed packets, so as to correctly identify normal data.

As a further improvement of the present invention, in the data sending module, the encryption method is determined by the flag bit width of the scrambled packet. Different flag bit widths of the scrambled packet represent different encryption methods, and the normal data packet is changed according to the corresponding encryption method. Into a scrambled packet;

In the data receiving module, the decryption mode is determined by the flag bit width of the scrambled packet, and the flag bit widths of different scrambled packets represent different decryption methods. In the processing module, the scrambled packet is changed into Normal data packet.

The present invention also provides a computer-readable storage medium that stores a computer program, and the computer program is configured to implement the steps of the communication encryption method of the present invention when called by a processor.

The beneficial effects of the invention

Beneficial effect

The beneficial effects of the present invention are: pirates generally pay attention to the structure of each packet of data, and ignore the situation when the state of each packet is switched, treat the disturbed packet as normal data, and the disturbed packet is still random, It is fast, which greatly increases the privacy of encryption and causes great interference to pirates. Brief description of the drawings

Description of the drawings

Figure 1 is a schematic diagram of the data of the present invention.

Invention embodiment

Embodiments of the present invention

The invention discloses a communication encryption method, which includes a data sending step and a data receiving step. The transmitting end executes the data sending step, and the receiving end executes the data receiving step.

The data sending step: when sending a normal data packet, the transmitting end will randomly send the scrambled packet according to the sending rules. The scrambled packet has a flag bit. The data format of the scrambled packet is the same as that of the normal data packet, but the data format of the scrambled packet is the same as that of the normal data packet. The instruction data is wrong;

The data receiving step: the receiving end detects the scrambled packet by identifying the flag bit of the scrambled packet, and determines whether the counter has reached the maximum value. If the counter does not reach the maximum value and the scrambled packet is received, then the processing steps are executed, and the counter is automatically Cleared to zero; if the counter reaches the maximum value and there is still no interference packet detected, then the interference processing is performed; the counter matches the sending rule;

As an embodiment of the present invention, in the data sending step, when sending a normal data packet, the sending rule is to randomly send a scrambled packet within a set time, for example, randomly send a scrambled packet every 10 seconds, then it is possible In the first 10 seconds, a scramble packet was sent in the second and sixth seconds; in the second 10 seconds, a scramble packet was sent in the third, seventh, and ninth seconds. In the data receiving step, the maximum value of the counter is also 10 seconds. If the counter does not reach 10 seconds and the jamming packet is received, the processing steps are executed and the counter is automatically cleared; if the counter reaches 10 seconds, there is still no detection When the jamming packet is reached, then the jamming process is performed.

As a preferred embodiment of the present invention, in the data sending step, when sending a normal data packet, the sending rule is to randomly send a scrambled packet within the set normal data packet state switching times, for example, the set normal data packet state The number of switching times is 5, the first normal data packet is 0010, the second normal data packet is 0100, the third normal data packet is 0011, the fourth normal data packet is 0101, and the fifth normal data packet is 0110 , Because the states of the five normal data packets are not the same, it is considered that the normal data packet state has been switched 5 times. If it is specifically applied to the remote control car, then the first normal data packet means that the remote control car is moving forward, and the second is normal The data packet means that the remote control car is going back, the third normal data packet means the remote control car turns left, the fourth normal data packet means the remote control car turns right, and the fifth normal data packet means the remote control car stops; in the normal data packet Within 5 times of state switching, a scrambled packet can be sent once or a scrambled packet can be sent twice, so it is a scrambled packet sent randomly. In the data receiving step, it is judged whether the data state switching counter at the receiving end has reached the maximum value, that is, 5 times. If the data state switching counter at the receiving end does not reach the maximum value 5 times, and after receiving the jamming packet, then perform processing Step, and the data state switching counter at the receiving end is automatically cleared; if the data state switching counter at the receiving end reaches the maximum value 5 times and the jamming packet is still not detected, then interference processing is performed.

In the data receiving step, the interference processing includes stopping or outputting an error instruction, and outputting an error instruction so that operation disorder occurs.

When there is a disturbed packet, there are two ways to deal with it:

The first processing method: the receiving end deletes the scrambled packet or does not read the scrambled packet.

The second processing method: in the data sending step, the normal data packet is changed according to the set rule, so that the normal data packet becomes a scrambled packet; in the processing step, the scrambled packet is processed according to the set rule Change, so as to turn the scrambled packet into a normal data packet; for example, if the normal data packet is 0100, then the transmitting end will reverse the normal data packet 0100 to 1011 according to the set rules, thereby turning the normal data packet into a scrambled packet, and then The transmitting end sends the normal data packet and the scrambled packet to the receiving end; after detecting the scrambled packet, the receiving end reverses all the scrambled packets 1011 to 0100 according to the set rules, thereby turning the scrambled packet into a normal data packet. The second processing method can reduce the delay of reading data at the receiving end, and the effect is very good. Of course, the setting rule can also be the inversion of a certain bit of the normal data packet. For example, if the last bit of 0100 is inverted for the normal data packet, then the scrambled packet is 0101. The setting rules can be set according to customer needs. .

The flag bit of the scrambled packet of the present invention is not an easy-to-identify data. The following is a detailed description: Compared with the flag bit of the normal data packet, the flag bit of the scrambled packet has the same level and shape, but the electrical The level width is different; in the data receiving step, the jammed packet is identified by judging the level width of the flag bit.

That is to say, the flag bit of the scrambled packet has the same level and shape as the flag bit of the normal data packet, but the flag bit of the scrambled packet and the flag bit of the normal data packet have different level widths, so the flag of the scrambled packet Bits do not have outstanding different characteristics and cannot be easily identified by pirates. This is a very important feature. In the present invention, in the data receiving step, the scrambled packet is identified by judging the level width of the flag bit. For example, the flag bit width of the normal data packet is 500us, and the flag bit width of the scrambled packet is 550us or 600us. Then, in the data receiving In the step, when it is detected that the width of the flag bit is 500 us, it is regarded as a normal data packet, and when it is detected that the width of the flag bit is 550 us or 600 us, it is regarded as a scrambled packet.

The flag bit of the scrambled packet, its width itself also carries encrypted information, such as:

In the data sending step, the encryption method is determined by the flag bit width of the scrambled packet, and the flag bit widths of different scrambled packets represent different encryption methods, and the normal data packet is changed into a scrambled packet according to the corresponding encryption method;

For example: the flag bit width of a normal data packet is: 500us;

Example 1: The flag bit width of the scrambled packet is 550us. In the data sending step, the flag bit width 550us of the scrambled packet is used to determine that the encryption method is encryption method 1 (all data is reversed), and the normal data packet is changed to encryption method 1. The scrambled packet, for example, normal data: 10110010, encryption method one data: 01001101 (scrambling packet). In the data receiving step, the flag bit width of the scrambled packet is 550us to determine that the decryption mode is decryption mode 1 (all data is reversed). In the processing step, the scrambled data packet is transformed into a normal data packet according to the decryption mode 1, for example , The scrambled packet 01001101 becomes normal data 10110010.

Example 2: The flag bit width of the scrambled packet is 600us. In the data transmission step, the flag bit width 600us of the scrambled packet is used to determine the encryption method as encryption method two (odd-bit data is reversed, even-bit data remains intact), according to the encryption method Second, the normal data packet is turned into a scrambled packet, for example, normal data: 10110010, encryption method two data: 00011001 (scrambling packet). In the data receiving step, the decryption mode is determined to be decryption mode 2 by the flag bit width 600us of the scrambled packet (the odd-numbered data is inverted, and the even-numbered data is kept as it is). In the processing step, the scrambled data packet will be scrambled according to the decryption mode 2 It becomes a normal data packet, for example, the scrambled packet 00011001 becomes normal data 10110010.

Example 3: The flag bit width of the scrambled packet is 450us. In the data transmission step, the encryption method is determined by the flag bit width 450us of the scrambled packet as encryption method three (even-digit data is inverted, and odd-digit data remains intact), according to the encryption method Third, the normal data packet is turned into a scrambled packet, for example, normal data: 10110010, and encryption method three data: 11100111 (scrambling packet). In the data receiving step, the decryption mode is determined to be decryption mode 3 (even-numbered data is inverted, and odd-numbered data is kept as it is) through the flag bit width 450us of the scrambled packet. In the processing step, the data packet is scrambled according to decryption mode three. It becomes a normal data packet, for example, the scrambled packet 11100111 becomes normal data 10110010.

It can be seen from the above embodiments that, in this way, many encryption methods can be extended to increase the difficulty coefficient of the decryption.

To sum up, the communication encryption method of the present invention no longer focuses on the processing of data packets, but randomly sends disturbed packets when normal data changes. Such random and temporary data changes are difficult to pass through the oscilloscope or The logic analyzer captures valid data, and pirates often ignore this data. The transmitter will have a data state switching counter, which will randomly send a scrambled packet after a certain number of data state switches, and the data format of the scrambled packet is the same as the normal data packet, the difference is that the command data of the scrambled packet is wrong. The genuine decoding IC can filter out the disturbed packet by identifying the flag bit of the disturbed packet, while the pirated decoding IC will treat the instruction of the disturbed packet as normal data to process the operation disorder. For example, for a remote control car product, the remote control is the transmitter, and the remote control car is the receiver. The transmitter will send forward code, backward code, and left turn code. If it is a genuine receiver, the forward and backward switching is quick and unresponsive. There will be other situations, and the receiving end of the pirated version will find that when the operation is moving forward and backward, the remote control car will suddenly turn left or right from time to time, and there is no pattern to find.

The present invention also discloses a communication encryption system, which includes a data sending module and a data receiving module. The data sending module is used to randomly send a scrambled packet according to the sending rule when a normal data packet is sent, and the scrambled packet has a flag bit. , The data format of the scrambled packet is the same as that of the normal data packet, but the command data of the scrambled packet is wrong;

In the data sending module, the normal data packet state switching times are recorded by the transmitting end data state switching counter, and the scrambled packet is randomly sent within the set normal data packet state switching times. The scrambled packet has a flag bit and the data format of the scrambled packet The data format of the normal data packet is the same, but the command data of the disturbed packet is wrong;

In the data receiving module, the counter is a data state switching counter at the receiving end. The scrambled packet is detected by identifying the flag bit of the scrambled packet to determine whether the data state switching counter at the receiving end has reached the maximum value. After the counter has not reached the maximum value and the scrambled packet is received, the processing module is executed, and the data state switching counter at the receiving end is automatically cleared; if the data state switching counter at the receiving end reaches the maximum value, the scrambled packet is still not detected, then interference deal with;

In the processing module, the scrambled packet is deleted or the scrambled packet is not read.

In the data sending module, the normal data packet is changed according to the set rule, thereby turning the normal data packet into a scrambled packet;

In the processing module, the scrambled packet is changed according to the set rule, so that the scrambled packet becomes a normal data packet.

The present invention also discloses a computer-readable storage medium, the computer-readable storage medium stores a computer program, and the computer program is configured to implement the steps of the communication encryption method of the present invention when called by a processor.

The technical advantages of the present invention: pirates generally pay attention to the structure of each packet of data, and ignore the situation when the state of each packet is switched, and use the disturbed packet as normal data, and the disturbed packet is still random and fast Sexual, greatly increasing the privacy of encryption and causing great interference to pirates.

The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be considered that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, a number of simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

A communication encryption method, characterized in that it includes a data sending step and a data receiving step. The data sending step: when sending a normal data packet, randomly sending a scrambled packet according to a sending rule, the scrambled packet has a flag bit, and the scrambled packet The data format of is the same as the data format of the normal data packet, but the command data of the disturbed packet is wrong;

The data receiving step: detect the scrambled packet by identifying the flag bit of the scrambled packet, and determine whether the counter has reached the maximum value. If the counter has not reached the maximum value and the scrambled packet is received, the processing steps are executed and the counter is automatically cleared. ; If the counter reaches the maximum value, and there is still no interference packet detected, then the interference processing is performed; the counter matches the sending rule;

Processing steps: processing the disturbed packet, so as to correctly identify the normal data.
The communication encryption method according to claim 1, wherein the flag bit of the scrambled packet has the same level as the flag bit of the normal data packet, but the level width of the two is different; in the data receiving step In, by judging the level width of the flag bit to identify the disturbed packet.
The communication encryption method according to claim 1, characterized in that, in the data sending step, the number of normal packet state switching is recorded by the transmitting end data state switching counter, and the number of normal packet state switching is random within the set number of normal packet state switching. Send a scrambled packet, the scrambled packet has a flag bit, the data format of the scrambled packet is the same as the data format of the normal data packet, but the command data of the scrambled packet is wrong;

In the data receiving step, the counter is a data state switching counter at the receiving end, the scrambled packet is detected by identifying the flag bit of the scrambled packet, and it is judged whether the data state switching counter at the receiving end has reached the maximum value, if the data state switching at the receiving end After the counter has not reached the maximum value and the scrambled packet is received, the processing steps are executed, and the data state switching counter at the receiving end is automatically cleared; if the data state switching counter at the receiving end reaches the maximum value, the scrambled packet is still not detected, then interference Processing: Among them, the normal data packet state switching times set by the transmitting end data state switching counter are the same as the maximum value set by the receiving end data state switching counter.
The communication encryption method according to claim 1, characterized in that, in the data receiving step, the interference processing includes stopping or outputting an error instruction, outputting an error instruction so that operation disorder occurs.
The communication encryption method according to any one of claims 1 to 4, wherein in the processing step, the scrambled packet is deleted or the scrambled packet is not read.
The communication encryption method according to any one of claims 2 to 4, characterized in that, in the data sending step, the normal data packet is changed according to a set rule, thereby turning the normal data packet into a scrambled packet;

In the processing steps, the scrambled packet is changed according to the set rule, so that the scrambled packet is changed into a normal data packet.
The communication encryption method according to claim 6, characterized in that:

In the data sending step, the encryption method is determined by the flag bit width of the scrambled packet, and the flag bit widths of different scrambled packets represent different encryption methods, and the normal data packet is changed into a scrambled packet according to the corresponding encryption method;

In the data receiving step, the decryption mode is determined by the flag bit width of the scrambled packet, and the flag bit widths of different scrambled packets represent different decryption methods. In the processing step, the scrambled packet is changed into Normal data packet.
A communication encryption system, characterized by comprising a data sending module and a data receiving module, the data sending module is used to randomly send a scrambled packet according to the sending rules when sending a normal data packet, and the scrambled packet has a flag bit, The data format of the scrambled packet is the same as that of the normal data packet, but the command data of the scrambled packet is wrong;

The data receiving module is used to detect the scrambled packet by identifying the flag bit of the scrambled packet, and determine whether the counter has reached the maximum value. If the counter does not reach the maximum value and the scrambled packet is received, the processing module is executed and the counter is automatically Cleared to zero; if the counter reaches the maximum value and there is still no interference packet detected, then the interference processing is performed; the counter matches the sending rule;

Processing module: used to process disturbed packets, so as to correctly identify normal data.
The communication encryption system according to claim 8, wherein the flag bit of the scrambled packet has the same level as the flag bit of the normal data packet, but the level width of the two is different; in the data receiving step In, by judging the level width of the flag bit to identify the disturbed packet.
The communication encryption system according to claim 9, characterized in that, in the data sending module, the encryption method is determined by the flag bit width of the scrambled packet, and the flag bit width of different scrambled packets represents different encryption methods. The encryption method turns normal data packets into scrambled packets;

In the data receiving module, the decryption mode is determined by the flag bit width of the scrambled packet, and the flag bit widths of different scrambled packets represent different decryption methods. In the processing module, the scrambled packet is changed into Normal data packet.