CN110278079B - High-security LoRa communication method and system based on dynamic chaotic encryption - Google Patents
High-security LoRa communication method and system based on dynamic chaotic encryption Download PDFInfo
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- CN110278079B CN110278079B CN201910590734.2A CN201910590734A CN110278079B CN 110278079 B CN110278079 B CN 110278079B CN 201910590734 A CN201910590734 A CN 201910590734A CN 110278079 B CN110278079 B CN 110278079B
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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
- H04L9/001—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols using chaotic signals
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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
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0861—Generation of secret information including derivation or calculation of cryptographic keys or passwords
- H04L9/0872—Generation of secret information including derivation or calculation of cryptographic keys or passwords using geo-location information, e.g. location data, time, relative position or proximity to other entities
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/02—Protecting privacy or anonymity, e.g. protecting personally identifiable information [PII]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/03—Protecting confidentiality, e.g. by encryption
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/04—Key management, e.g. using generic bootstrapping architecture [GBA]
- H04W12/041—Key generation or derivation
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- H—ELECTRICITY
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- H04W12/60—Context-dependent security
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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Abstract
The high-security LoRa communication method and the system based on dynamic chaotic encryption provided by the invention dynamically acquire time and geographical position information through the positioning unit; generating a chaotic binary sequence by using a microprocessor based on time and geographic position information, encrypting a data load to be transmitted according to the chaotic binary sequence, and generating an encrypted message; and finally, communicating the encrypted message through the LoRa radio frequency unit. The invention provides a high-security LoRa communication method and system based on dynamic chaotic encryption.A microprocessor is used as a chaotic generator, a chaotic binary sequence with variable length is dynamically generated by utilizing time and geographical position information acquired by a GPS (global positioning system) positioning unit, and a data load to be sent is encrypted or decrypted, so that safe wireless information transmission is realized; and the chaotic binary sequences generated each time are different, and dynamic characteristics are introduced into the encryption/decryption process, so that the retransmission attack of the eavesdropping node is effectively resisted.
Description
Technical Field
The invention relates to the technical field of wireless communication of the Internet of things, in particular to a high-security LoRa communication method based on dynamic chaotic encryption and a high-security LoRa communication system based on dynamic chaotic encryption.
Background
LoRa is a low power wide area network communication technology. The IoT system communication scheme has the advantages of low manufacturing cost, wide signal coverage range and high cost performance, thereby becoming an attractive IoT system communication scheme. In the LoRa-IoT communication scenario, the LoRa signal is susceptible to eavesdropping due to the broadcast nature of the wireless channel. As shown in fig. 1, in a communication scenario where there is an eavesdropping node, when an LoRa-IoT node sends uplink data (typically, environmental information collected by a sensor) to a base station, both the eavesdropping node and the LoRa base station within a coverage area may receive the LoRa signal. Because the LoRaWAN standard is public, the eavesdropping node can easily acquire the information transmitted by the LoRa-IoT node and carry out retransmission attack, thereby reducing the system security and bringing certain potential safety hazard.
In order to enhance system security, in the prior art, data to be sent is encrypted at an LoRa-IoT node mainly in a software encryption manner, that is, the data to be sent is encrypted at a Micro Control Unit (MCU) of the LoRa-IoT node based on a locally stored encryption algorithm, and the LoRa radio frequency Unit sends the encrypted data. Even if an eavesdropper obtains the encrypted data, it is difficult to quickly decode and obtain the transmitted information. However, the static encryption process is easy to track and crack, and can not effectively resist retransmission attack. In particular, in the retransmission attack, the eavesdropping node replays the received historical signal, and the LoRa base station recognizes the historical signal as a legal signal to receive, thereby causing errors.
Disclosure of Invention
The invention provides a high-security LoRa communication system based on dynamic chaotic encryption, aiming at overcoming the technical defects that the conventional LoRa communication system is easy to track and crack in a static encryption process and cannot effectively resist retransmission attack.
The invention also provides a high-security LoRa communication system based on dynamic chaotic encryption.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the high-security LoRa communication method based on dynamic chaotic encryption comprises the following steps of:
s1: dynamically acquiring time and geographical position information;
s2: generating a chaotic binary sequence based on the time and the geographic position information;
s3: encrypting a data load to be transmitted according to the chaotic binary sequence to generate an encrypted message;
s4: the communication is performed using encrypted messages.
The specific process of step S2 is as follows:
s21: sending the geographical position information during last sending and a DevEUI sequence of the LoRa-IoT node into a chaos generator together for binary quantization processing to obtain a first chaos sequence;
s22: sending the currently sent time information and the first chaotic sequence into a chaotic generator together for binarization processing to obtain a second chaotic sequence;
s23: and encrypting the data load to be transmitted by utilizing the second chaotic sequence to generate an encrypted message.
The specific process of step S21 is as follows:
s211: converting the geographical position information during last transmission into a decimal with a value range of [0,1], recording the decimal as x, and taking the decimal as an initial value of the chaotic generator;
s212: code re-notation of LoRa-IoT node DevEUI sequence as l1For representing the length of the chaotic sequence to be generated;
s213: the chaos generator generates length l based on the mapping of the logics1Of (2) a
And carrying out binarization processing on the first chaotic sequence to generate a first chaotic sequence which is recorded as
The specific process of step S22 is as follows:
s221: converting the currently transmitted time information into a decimal with a value range of [0,1], recording the decimal as y, and taking the decimal as an initial value of the chaotic generator;
s222: code repetition of the first chaotic sequence is recorded as l2For representing the length of the chaotic sequence to be generated;
s223: chaos generator based on logistic mapping generationLength of l2Of (2) a
And carrying out binarization processing on the first chaotic sequence to generate a second chaotic sequence which is recorded as
The specific process of step S23 is as follows:
s231: complementing a '1' code at the end of a binary sequence of a data load to be transmitted, and expanding the binary sequence to a length of l2Integer multiples of;
s232: each l is to be2Units of bit length are denoted
Respectively with the second chaotic sequence
Performing XOR operation to generate encrypted sequence
The data load to be sent comprises sensor information and currently sent geographical position information.
And the currently transmitted geographic position information is used for decrypting the information transmitted next time.
The high-security LoRa communication system based on dynamic chaotic encryption comprises a sensor module, an encryption module and a receiving module; wherein:
the encryption module comprises a microprocessor, a positioning unit and a LoRa radio frequency unit; the positioning unit is electrically connected with the input end of the microprocessor; the LoRa radio frequency unit is electrically connected with the output end of the microprocessor;
the sensor module is electrically connected with the input end of the microprocessor;
the receiving module is in wireless communication connection with the LoRa radio frequency unit.
Wherein, the microprocessor adopts but not limited to STM32F4072GT6 microprocessor.
The positioning unit adopts a GPS positioning unit.
In the scheme, the microprocessor is used for controlling the GPS positioning unit to dynamically acquire time and geographical position information, dynamically generating a chaotic binary sequence based on the time and geographical position information, encrypting or decrypting a data load to be transmitted, and controlling the LoRa radio frequency unit to wirelessly transmit or receive; the GPS positioning unit is used for acquiring time and geographical position information; the LoRa radio frequency unit is used for wireless transmission or reception of data loads.
In the above-mentioned scheme, microprocessor passes through the UART interface and is connected with GPS positioning unit, is connected with loRa radio frequency unit through the SPI interface, and loRa communication system provides but not only is limited to the SPI interface and is connected with external module.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention provides a high-security LoRa communication method and system based on dynamic chaotic encryption.A microprocessor is used as a chaotic generator, a chaotic binary sequence with variable length is dynamically generated by utilizing time and geographical position information acquired by a GPS (global positioning system) positioning unit, and a data load to be sent is encrypted or decrypted, so that safe wireless information transmission is realized; and the chaotic binary sequences generated each time are different, and dynamic characteristics are introduced into the encryption/decryption process, so that the retransmission attack of the eavesdropping node is effectively resisted. Due to the common characteristic of GPS time, no extra signaling or synchronization signal is needed between the receiving modules to generate the same chaotic binary sequence as the transmitting end.
Drawings
Fig. 1 is a schematic diagram of an LoRa-IoT communication scenario in which an eavesdropping node exists;
fig. 2 is a schematic flow chart of a high-security LoRa communication method based on dynamic chaotic encryption;
FIG. 3 is a schematic flow chart of dynamic chaotic encryption;
fig. 4 is a schematic connection diagram of a high-security LoRa communication system based on dynamic chaotic encryption;
FIG. 5 is a schematic flow chart of dynamic chaotic decryption;
wherein: 1. a sensor module; 2. an encryption module; 21. a microprocessor; 22. a positioning unit; 23. a LoRa radio frequency unit; 3. and a receiving module.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 2, the high security LoRa communication method based on dynamic chaotic encryption includes the following steps:
s1: dynamically acquiring time and geographical position information;
s2: generating a chaotic binary sequence based on the time and the geographic position information;
s3: encrypting a data load to be transmitted according to the chaotic binary sequence to generate an encrypted message;
s4: the communication is performed using encrypted messages.
More specifically, as shown in fig. 3, the specific process of step S2 is as follows:
s21: sending the geographical position information during last sending and a DevEUI sequence of the LoRa-IoT node into a chaos generator together for binary quantization processing to obtain a first chaos sequence;
s22: sending the currently sent time information and the first chaotic sequence into a chaotic generator together for binarization processing to obtain a second chaotic sequence;
s23: and encrypting the data load to be transmitted by utilizing the second chaotic sequence to generate an encrypted message.
More specifically, the specific process of step S21 is as follows:
s211: converting the geographical position information during last transmission into a decimal with a value range of [0,1], recording the decimal as x, and taking the decimal as an initial value of the chaotic generator;
s212: code re-notation of LoRa-IoT node DevEUI sequence as l1For representing the length of the chaotic sequence to be generated;
s213: the chaos generator generates length l based on the mapping of the logics1Of (2) a
And carrying out binarization processing on the first chaotic sequence to generate a first chaotic sequence which is recorded as
In the specific implementation process, taking the north latitude east longitude area as an example, the data format of the GPS geographic position information is "naabb. mmmm, eccccd. nnnn", which indicates that the position is located at aa degree bb.mmmm of north latitude and dd.nnnn degree of east longitude ccc, then the generation mode of x is that
More specifically, the specific process of step S22 is as follows:
s221: converting the currently transmitted time information into a decimal with a value range of [0,1], recording the decimal as y, and taking the decimal as an initial value of the chaotic generator;
s222: code repetition of the first chaotic sequence is recorded as l2For representing the length of the chaotic sequence to be generated;
s223: the chaos generator generates length l based on the mapping of the logics2Of (2) a
And carrying out binarization processing on the first chaotic sequence to generate a second chaotic sequence which is recorded as
In the specific implementation process, theTaking north latitude east longitude area as an example, the data format of the GPS time information is 'hhmms. eee', which represents UTC time hh time mm is ss. eee second, then the generation mode of y is
More specifically, the specific process of step S23 is as follows:
s231: complementing a '1' code at the end of a binary sequence of a data load to be transmitted, and expanding the binary sequence to a length of l2Integer multiples of;
s232: each l is to be2Units of bit length are denoted
Respectively with the second chaotic sequence
Performing XOR operation to generate encrypted sequence
More specifically, the data load to be transmitted includes sensor information and currently transmitted geographical location information.
More specifically, the currently transmitted geographical location information is used to encrypt the next transmitted information.
Example 2
More specifically, on the basis of embodiment 1, as shown in fig. 4, the high-security LoRa communication system based on dynamic chaotic encryption includes a sensor module 1, an encryption module 2, and a receiving module 3; wherein:
the encryption module 2 comprises a microprocessor 21, a positioning unit 22 and a LoRa radio frequency unit 23; the positioning unit 22 is electrically connected with the input end of the microprocessor 21; the LoRa rf unit 23 is electrically connected to the output end of the microprocessor 21;
the sensor module 1 is electrically connected with the input end of the microprocessor 21;
the receiving module 3 is connected with the LoRa radio frequency unit 23 in a wireless communication mode.
More specifically, the microprocessor 21 is an STM32F4072GT6 microprocessor, but is not limited to the microprocessor.
More specifically, the positioning unit 22 is a GPS positioning unit.
In a specific implementation process, the microprocessor 21 is configured to control the GPS positioning unit 22 to dynamically acquire time and geographic position information, dynamically generate a chaotic binary sequence based on the time and geographic position information, encrypt or decrypt a data load to be transmitted, and control the LoRa radio frequency unit 23 to wirelessly transmit or receive the data load; the GPS positioning unit 22 is used for acquiring time and geographical position information; the LoRa rf unit 23 is used for wireless transmission or reception of data payload.
In the specific implementation process, the microprocessor 21 is connected with the GPS positioning unit 22 through the UART interface, and is connected with the LoRa radio frequency unit 23 through the SPI interface, and the LoRa communication system provides but is not limited to the SPI interface and is connected with the external module.
In the specific implementation process, when the system is externally connected with the MCU, the microprocessor 21 in the system is equivalent to an encryption chip and dynamically and chaotically encrypts the selected data load; when not connected with the MCU, the microprocessor 21 in the system has the functions of controlling the sensor and reading the sensor signal except for dynamically chaotic encryption of the selected data load.
Example 3
More specifically, as shown in fig. 5, a decryption method corresponding to the dynamic chaotic encryption method is provided, and the decryption mechanism is also performed by the microprocessor 21. The decryption process requires current GPS time information and the last received GPS geographical position information; the GPS time information is obtained by controlling the GPS positioning unit 22 by the microprocessor 21, the receiving module 3 determines the identity of the currently received corresponding LoRa radio frequency unit 23 in a needle detection mode by searching the GPS geographical position information stored in each LoRa radio frequency unit 23, and the GPS geographical position information when the LoRa radio frequency unit 23 is sent last time is taken out from the lookup table.
More specifically, the LoRa rf unit 23 may serve as both a transmitting end and a receiving end, that is, the LoRa rf unit 23 may replace the receiving module 3 to be applied in the system.
In the specific implementation process, the specific steps of the dynamic chaotic decryption are as follows:
sending the GPS geographical position information received last time and a DevEUI sequence of a sending node, namely a LoRa radio frequency unit 23 into a chaos generator together for binary quantization processing to obtain a third chaos sequence; in the same sending and receiving process, the generated first chaotic sequence and the generated third chaotic sequence are the same;
inputting currently received GPS time information and a third chaotic sequence into a chaotic generator, and carrying out binarization processing to generate a fourth chaotic sequence; the difference between the sending and receiving starting time is overcome by adjusting the precision of the GPS event information adopted in the process of generating the first chaotic sequence and the third chaotic sequence, so that the second chaotic sequence and the fourth chaotic sequence are generated corresponding to the same sending and receiving process; the fourth chaotic sequence is recorded as
Having a length of l4Then the corresponding transceiving process has
And l4＝l2；
For a received encrypted message, for each l4Unit of bit length, note
n is a positive integer, respectively with
Performing XOR operation to obtain a decrypted sequence
In the specific implementation process, the decryption sequence comprises sensor information and currently received GPS information, and before decryption is completed, the GPS geographic position information corresponding to the current system is updated in the lookup table and used in the next decryption.
In the specific implementation process, when the high-security LoRa communication system based on dynamic chaotic encryption is used for communication, chaotic encryption sequences adopted in each transmission are different, and the chaotic sequences have the pseudorandom characteristic, so that the communication between the LoRa-IoT nodes can effectively resist retransmission attack and brute force decryption, and the security characteristic of the LoRa-IoT system is improved. In addition, the system introduces dynamic characteristics for software encryption by using hardware structural units, is low in complexity and is suitable for an IoT system.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. The LoRa communication method based on dynamic chaotic encryption is characterized by comprising the following steps of:
s1: dynamically acquiring time and geographical position information;
s2: generating a chaotic binary sequence based on the time and the geographic position information;
s3: encrypting a data load to be transmitted according to the chaotic binary sequence to generate an encrypted message;
s4: carrying out communication by utilizing the encrypted message;
the specific process of step S2 is as follows:
s21: sending the geographical position information during last sending and a DevEUI sequence of the LoRa-IoT node into a chaos generator together for binary quantization processing to obtain a first chaos sequence;
s22: sending the currently sent time information and the first chaotic sequence into a chaotic generator together for binarization processing to obtain a second chaotic sequence;
s23: and encrypting the data load to be transmitted by utilizing the second chaotic sequence to generate an encrypted message.
2. The LoRa communication method based on dynamic chaotic encryption according to claim 1, wherein: the specific process of step S21 is as follows:
s211: converting the geographical position information during last transmission into a decimal with a value range of [0,1], recording the decimal as x, and taking the decimal as an initial value of the chaotic generator;
s212: code re-notation of LoRa-IoT node DevEUI sequence as l1For representing the length of the chaotic sequence to be generated;
s213: the chaos generator generates length l based on the mapping of the logics1Of (2) a
And carrying out binarization processing on the first chaotic sequence to generate a first chaotic sequence which is recorded as
3. The LoRa communication method based on dynamic chaotic encryption according to claim 2, wherein: the specific process of step S22 is as follows:
s221: converting the currently transmitted time information into a decimal with a value range of [0,1], recording the decimal as y, and taking the decimal as an initial value of the chaotic generator;
s222: code repetition of the first chaotic sequence is recorded as l2For representing the length of the chaotic sequence to be generated;
s223: the chaos generator generates length l based on the mapping of the logics2Of (2) a
And carrying out binarization processing on the first chaotic sequence to generate a second chaotic sequence which is recorded as
4. The LoRa communication method based on dynamic chaotic encryption according to claim 3, wherein: the specific process of step S23 is as follows:
s231: complementing a '1' code at the end of a binary sequence of a data load to be transmitted, and expanding the binary sequence to a length of l2Integer multiples of;
s232: each l is to be2Units of bit length are denoted
Respectively with the second chaotic sequence
Performing XOR operation to generate encrypted sequence
5. The LoRa communication method based on dynamic chaotic encryption according to any one of claims 1 to 4, characterized in that: the data load to be sent comprises sensor information and currently sent geographical position information.
6. The LoRa communication method based on dynamic chaotic encryption according to claim 5, wherein: the currently transmitted geographical location information is used to decrypt the next transmitted information.
7. LoRa communication system based on dynamic chaotic encryption, its characterized in that: the device comprises a sensor module (1), an encryption module (2) and a receiving module (3); wherein:
the encryption module (2) comprises a microprocessor (21), a positioning unit (22) and a LoRa radio frequency unit (23); the positioning unit (22) is electrically connected with the input end of the microprocessor (21); the LoRa radio frequency unit (23) is electrically connected with the output end of the microprocessor (21);
the sensor module (1) is electrically connected with the input end of the microprocessor (21);
the receiving module (3) is in wireless communication connection with the LoRa radio frequency unit (23); wherein:
the microprocessor (21) is used for controlling the positioning unit (22) to dynamically acquire time and geographical position information, dynamically generating a chaotic binary sequence based on the time and geographical position information and the information acquired by the sensor module (1), finally encrypting a data load to be transmitted according to the chaotic binary sequence to generate an encrypted message, and communicating with the receiving module (3) by the LoRa radio frequency unit (23) through the encrypted message; the dynamic generation of the chaotic binary sequence based on the time and the geographic position information specifically comprises the following steps:
sending the geographical position information during last sending and a DevEUI sequence of the LoRa-IoT node into a chaos generator together for binary quantization processing to obtain a first chaos sequence; and sending the currently sent time information and the first chaotic sequence into a chaotic generator together for binarization processing to obtain a second chaotic sequence.
8. The LoRa communication system based on dynamic chaotic encryption of claim 7, wherein: the microprocessor (21) employs an STM32F4072GT6 microprocessor.
9. The LoRa communication system based on dynamic chaotic encryption of claim 8, wherein: the positioning unit (22) adopts a GPS positioning unit.
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