CN116859901B - Data security analysis method and system for avionic system - Google Patents
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Abstract
The invention provides a data security analysis method and a system of an avionic system, which relate to the technical field of data processing, and the method comprises the following steps: acquiring first flight data; sending a random modification instruction to the flight data recording component to acquire second flight data; generating simulated flight data according to the first flight data and the random modification instruction; determining tamper-resistant security scores for the flight data according to the simulated flight data, the first flight data and the second flight data; generating a test control signal and a random interference signal and sending the test control signal and the random interference signal to a flight control system; collecting response data of a flight control system; determining a flight anti-interference safety score according to the test control signal and the response data; and determining the data security score according to the flight data tamper-resistant security score and the flight tamper-resistant security score. According to the invention, the anti-interference performance of the flight control system under special conditions can be tested, and the flight data is not easily influenced by the environment and tampered.
Description
Technical Field
The present invention relates to the field of data processing technologies, and in particular, to a data security analysis method and system for an avionic system.
Background
The avionic system has high requirements on data safety, and has high safety requirements on flight control instruction data in the flight process and flight data recorded in the flight process, so that the safety of the flight process is ensured, and the study on the flight data is ensured to be carried out smoothly. However, in the related art, the anti-interference performance of the control command data during the flight is generally tested by adopting a fixed test mode, for example, electromagnetic wave interference, vibration interference, high temperature or low temperature interference and the like which are commonly encountered during the flight are used for testing the anti-interference performance of the flight control system when the control command is executed, but various situations can be encountered during the flight, and some situations are easily ignored by adopting the fixed test mode, so that the anti-interference performance under some special situations is difficult to determine. Also, testing for the safety of the flight data is often easily ignored, but if the flight data is tampered with, it is difficult to restore the true flight state of the aircraft.
The information disclosed in the background section of the application is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The embodiment of the invention provides a data security analysis method and a data security analysis system for an avionic system, which can test the anti-interference performance of a flight control system under special conditions, and enable flight data not to be easily influenced by environment and tampered.
According to a first aspect of an embodiment of the present invention, there is provided a data security analysis method of an avionics system, comprising: connecting test equipment to a flight data recording assembly and acquiring first flight data, wherein the first flight data is a data set for recording the flight state and the position of each recording moment; sending a random modification instruction to the flight data recording component, and acquiring second flight data; generating simulated flight data according to the first flight data and the random modification instruction; determining a tamper-resistant security score for the flight data according to the simulated flight data, the first flight data and the second flight data; connecting the test equipment to a flight control system; generating a test control signal and sending the test control signal to the flight control system, and generating a random interference signal and sending the random interference signal to the flight control system; collecting response data of the flight control system; determining a flight anti-interference safety score according to the test control signal and the response data of the flight control system; and determining the data security score of the avionic system according to the tamper-resistant security score of the flight data and the tamper-resistant security score of the flight.
According to one embodiment of the invention, determining a flight data tamper-resistant security score from the simulated flight data, the first flight data and the second flight data comprises: determining a first similarity score from the first flight data and the second flight data; determining a simulated flight route according to simulated position data in the simulated flight data, wherein the simulated position data is used for representing position information recorded in the simulated flight data at each recording moment; determining a simulated theoretical flight route according to the simulated flight state data in the simulated flight data, wherein the simulated flight state data are used for representing flight states recorded in the simulated flight data at each recording moment, the flight states comprise the speed, the acceleration, the pitch angle, the yaw angle and the roll angle of the aircraft, and the simulated theoretical flight route is a theoretical route when the aircraft flies based on the simulated flight state data; determining a second flight route according to second position data in the second flight data, wherein the second position data is used for representing position information recorded in the second flight data at each recording moment; determining a second theoretical flight route according to second flight state data in the second flight data, wherein the second flight state data are used for representing flight states recorded in the second flight data at each recording moment, and the second theoretical flight route is a theoretical route when the aircraft flies based on the second flight state data; determining a route rationality score from the simulated flight route, the simulated theoretical flight route, the second flight route, and the second theoretical flight route; and determining the tamper-proof safety score of the flight data according to the first similarity score and the route rationality score.
According to one embodiment of the invention, determining a first similarity score from the first flight data and the second flight data comprises: obtaining first flight data vectors of a plurality of recording moments according to the first flight data of the plurality of recording moments; obtaining second flight data vectors of the plurality of recording moments according to the second flight data of the plurality of recording moments; according to the formulaDetermining said first similarity score +.>Wherein->First flight data vector for the ith recording moment,/->And (3) for the second flight data vector at the ith recording moment, N is the total number of the recording moments, i is less than or equal to N, and both i and N are positive integers.
According to one embodiment of the present invention, determining a simulated theoretical flight path from simulated flight state data in the simulated flight data includes: determining the simulation position data of the 1 st recording time as the simulation theoretical position data of the 1 st recording time; according to the speed data, the acceleration data, the pitch angle data, the yaw angle data and the rolling angle data in the flight state data at each recording moment and the simulated theoretical position data at the j-th recording moment, determining the simulated theoretical position data at the j+1th moment, wherein j is a positive integer greater than or equal to 1; fitting the simulated theoretical position data of each recording moment to obtain the simulated theoretical flight route.
According to one embodiment of the invention, determining a route rationality score from the simulated flight route, the simulated theoretical flight route, the second flight route, and the second theoretical flight route comprises: according to the formulaDetermining the route rationality score +.>Wherein->Indicating the position on the second flight path at time t,/->Indicating the position on the second theoretical flight path at time t,indicating the position on the simulated flight path at time t,indicating the position of the moment t on the simulated theoretical flight path,/->For the 1 st recording instant>For the last recording moment +.>。
According to one embodiment of the invention, determining a flight tamper safety score from the test control signal and the response data of the flight control system comprises: according to the test control signals, determining theoretical response data of each test moment of the flight control system; determining response difference data of each test moment according to the theoretical response data of each test moment and the response data of each moment; and determining the flight anti-interference safety score according to the response difference data of each test moment and the theoretical response data of each moment.
According to one embodiment of the invention, determining the flight anti-interference safety score according to the response difference data of each test moment and the theoretical response data of each moment comprises: according to the formulaDetermining the flight anti-interference security score +.>Wherein, the method comprises the steps of, wherein,，/>normalized data of kth response difference data for the s-th test moment, ++>Normalized data of the kth theoretical response data for the s-th test moment, +.>K is the K response data of the S-th test moment, K is the total number of types of the response data, S is the total number of the test moments, K is less than or equal to K, S is less than or equal to S, and K, K, S and S are positive integers.
According to a second aspect of an embodiment of the present invention, there is provided a data security analysis system for an avionics system, comprising: the first flight data module is used for connecting the test equipment to the flight data recording assembly and acquiring first flight data, wherein the first flight data is a data set for recording the flight state and the position of each recording moment; the second flight data module is used for sending a random modification instruction to the flight data recording component and acquiring second flight data; the simulated flight data module is used for generating simulated flight data according to the first flight data and the random modification instruction; the flight data tamper-proof safety scoring module is used for determining a flight data tamper-proof safety score according to the simulated flight data, the first flight data and the second flight data; a connection module for connecting the test device to a flight control system; the transmission module is used for generating a test control signal and transmitting the test control signal to the flight control system, and generating a random interference signal and transmitting the random interference signal to the flight control system; the acquisition module is used for acquiring response data of the flight control system; the flight anti-interference safety scoring module is used for determining flight anti-interference safety scores according to the test control signals and response data of the flight control system; and the data security scoring module is used for determining the data security score of the avionic system according to the flight data tamper-resistant security score and the flight anti-interference security score.
According to a third aspect of embodiments of the present invention, there is provided a data security analysis device for an avionics system, comprising: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to invoke the memory-stored instructions to perform a data security analysis method of the avionics system.
According to a fourth aspect of embodiments of the present invention, there is provided a computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement a data security analysis method of the avionics system.
According to the data security analysis method of the avionic system, the flight control system can be tested through the random interference signals, so that the flight control system can be tested under any random conditions, and compared with a fixed test mode, the anti-interference performance of the flight control system under special conditions can be tested more easily through the random interference signals, and the flight security is improved. Moreover, the anti-tampering safety of the flight data can be tested by randomly modifying the instruction, so that the loopholes of the flight data recording assembly can be found, the flight data is not easily affected by the environment, the tampering is not easily performed, and the storage safety of the flight data is improved. When evaluating the tamper-resistant capability of the flight data recording assembly, the similarity of the second flight data to the first flight data that is not tampered with can be determined based on the first similarity score, thereby determining the size of the amount of tampered data in the second flight data to determine the tamper-resistant security of the flight data recording assembly. The approach degree of the second flight data and the simulated flight data can be determined from the angle of the unreasonable degree of the second flight route corresponding to the second flight data and the simulated flight route corresponding to the simulated flight data, so that the magnitude of the tampered data amount in the second flight data is determined, and the tamper-resistant safety of the flight data recording assembly is determined. Therefore, the data tamper-proof safety of the flight data recording assembly can be evaluated from multiple angles, and the accuracy and objectivity of the flight data tamper-proof safety scoring are improved. When the anti-interference capability of the flight control system is evaluated, the deviation between actual response data and theoretical response data of the flight control system under the interference of random interference signals can be determined, the flight anti-interference safety score is determined based on the deviation, and the accuracy and objectivity of the flight anti-interference safety score are improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed. Other features and aspects of the present invention will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
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In order to more clearly illustrate the embodiments of the invention or the solutions of the prior art, the drawings which are necessary for the description of the embodiments or the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other embodiments may be obtained from these drawings without inventive effort to a person skilled in the art,
FIG. 1 schematically illustrates a flow chart of a data security analysis method of an avionics system, in accordance with an embodiment of the invention;
fig. 2 schematically shows a block diagram of a data security analysis system of an avionics system according to an embodiment of the invention.
Description of the embodiments
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The technical scheme of the invention is described in detail below by specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
Fig. 1 schematically shows a flow chart of a method for data security analysis of an avionics system according to an embodiment of the invention, as shown in fig. 1, the method comprising: step S101, connecting test equipment to a flight data recording assembly and acquiring first flight data, wherein the first flight data is a data set for recording the flight state and the position of each recording moment; step S102, a random modification instruction is sent to the flight data recording component, and second flight data are acquired; step S103, generating simulated flight data according to the first flight data and the random modification instruction; step S104, determining tamper-proof safety scores of flight data according to the simulated flight data, the first flight data and the second flight data; step S105, connecting the test device to the flight control system; step S106, generating a test control signal and sending the test control signal to the flight control system, and generating a random interference signal and sending the random interference signal to the flight control system; step S107, collecting response data of the flight control system; step S108, determining a flight anti-interference safety score according to the test control signal and response data of the flight control system; step S109, determining a data security score of the avionics system according to the tamper-resistant security score of the flight data and the tamper-resistant security score of the flight data.
According to the data security analysis method of the avionic system, the flight control system can be tested through the random interference signals, so that the flight control system can be tested under any random conditions, and compared with a fixed test mode, the anti-interference performance of the flight control system under special conditions can be tested more easily through the random interference signals, and the flight security is improved. Moreover, the anti-tampering safety of the flight data can be tested by randomly modifying the instruction, so that the loopholes of the flight data recording assembly can be found, the flight data is not easily affected by the environment, the tampering is not easily performed, and the storage safety of the flight data is improved.
According to one embodiment of the invention, in step S101, the flight data recording component is a memory on the aircraft for storing flight data during flight, and the memory has a high security, for example, a "black box" of the aircraft. The flight data may include position data at various times during the flight, and flight status data at various times during the flight (e.g., speed, acceleration, pitch angle, yaw angle, roll angle, etc. of the aircraft at various times), cabin environmental data at various times during the flight (e.g., temperature within the cabin, oxygen content, etc.), communication data (e.g., call recording of the pilot with the ground, etc.), and the invention is not limited to the particular type of flight data recorded by the flight data recording assembly.
According to one embodiment of the invention, the test device is a device for testing the safety of avionics systems, which may generate random test signals in a random manner. For example, the test device may be connected to the flight data recording component using a random access manner and generate a random test signal, such as a random modification instruction, which may modify various types of flight data recorded in the flight data recording component immediately, while the flight data recording component may have a high security, and thus, have a certain tamper resistance, but may not necessarily be able to prevent various random tamper means. Thus, the test device may generate a plurality of random modification instructions in an attempt to tamper with the first flight data held in the flight data recording component in a plurality of tamper means. In step S102, second flight data after the attempted tampering may be acquired. The second flight data may have some tampered data or may not have tampered data, and the smaller the tampered data amount, the higher the tamper-proof security of the flight data recording component may be indicated.
According to an embodiment of the present invention, in step S103, simulated flight data may be generated based on the first flight data and the random modification instruction, the first flight data may be exported to a memory without tamper resistance, and the first flight data may be modified based on the random modification instruction, so that the simulated flight data in the case where all the random modification instructions are successfully modified may be obtained.
According to an embodiment of the present invention, in step S104, tamper-resistant security of the flight data recording assembly may be evaluated based on the above first flight data, second flight data, and simulated flight data, and a tamper-resistant security score of the flight data may be obtained, for example, it may be determined how much data has been tampered with in the second flight data with respect to the first flight data, or it may be determined how much data has not been tampered with in the second flight data with respect to the simulated flight data, etc., which the present invention is not limited.
According to one embodiment of the present invention, step S104 may include: determining a first similarity score from the first flight data and the second flight data; determining a simulated flight route according to simulated position data in the simulated flight data, wherein the simulated position data is used for representing position information recorded in the simulated flight data at each recording moment; determining a simulated theoretical flight route according to the simulated flight state data in the simulated flight data, wherein the simulated flight state data are used for representing flight states recorded in the simulated flight data at each recording moment, the flight states comprise the speed, the acceleration, the pitch angle, the yaw angle and the roll angle of the aircraft, and the simulated theoretical flight route is a theoretical route when the aircraft flies based on the simulated flight state data; determining a second flight route according to second position data in the second flight data, wherein the second position data is used for representing position information recorded in the second flight data at each recording moment; determining a second theoretical flight route according to second flight state data in the second flight data, wherein the second flight state data are used for representing flight states recorded in the second flight data at each recording moment, and the second theoretical flight route is a theoretical route when the aircraft flies based on the second flight state data; determining a route rationality score from the simulated flight route, the simulated theoretical flight route, the second flight route, and the second theoretical flight route; and determining the tamper-proof safety score of the flight data according to the first similarity score and the route rationality score.
According to one embodiment of the invention, the similarity of the first flight data and the second flight data can be determined, so that whether the data amount of the second flight data tampered with respect to the first flight data is larger or not can be determined, if the first similarity score is higher, the tampered data amount is smaller, and the tamper-proof security is higher, otherwise, if the first similarity score is lower, the tampered data amount is larger, and the tamper-proof security is lower.
According to one embodiment of the invention, determining a first similarity score from the first flight data and the second flight data comprises: obtaining first flight data vectors of a plurality of recording moments according to the first flight data of the plurality of recording moments; obtaining second flight data vectors of the plurality of recording moments according to the second flight data of the plurality of recording moments; determining the first similarity score according to equation (1)，
Formula (1)
Wherein,first flight data vector for the ith recording moment,/->And (3) for the second flight data vector at the ith recording moment, N is the total number of the recording moments, i is less than or equal to N, and both i and N are positive integers.
According to one embodiment of the invention, the first flight data at each instant may comprise a variety of data, such as position data, speed, acceleration, pitch angle, yaw angle, roll angle, cabin temperature, and oxygen content, etc. at each instant. The data may be used as elements of a vector to form a first flight data vector at each time, or the data may be normalized, and the normalized data may be formed into the first flight data vector at each time.
Similarly, the second flight data at each time may include a variety of data, such as position data, speed, acceleration, pitch angle, yaw angle, roll angle, cabin temperature, and oxygen content at each time, and the like, according to one embodiment of the present invention. The data may be used as elements of a vector to form a second flight data vector at each time, or the data may be normalized, and the normalized data may be formed into the second flight data vector at each time.
According to one embodiment of the invention, after the first flight data vector and the second flight data vector of each moment are obtained, the first flight data vector and the second flight data vector of each moment can be substituted into formula (1) to be solved, in formula (1), cosine similarity of the first flight data vector and the second flight data vector of the same moment can be solved, and an average value of cosine similarity corresponding to each moment is solved to obtain a first similarity score, wherein the higher the first similarity score is, the more similar the first flight data and the second flight data are, namely, the smaller the tampered data amount is in the second flight data, and the higher the tamper-resistant safety of the flight data recording assembly is. Conversely, the lower the first similarity score, the greater the difference between the first flight data and the second flight data, i.e., the greater the amount of data in the second flight data that is tampered with, the lower the tamper-resistant security of the flight data recording assembly.
According to one embodiment of the invention, tamper-resistant security of the flight data recording assembly may also be assessed from another aspect. The random modification instruction can randomly tamper the first flight record, namely, the position data can be tampered, and the flight state data can also be tampered, so that the position data and the flight state data can be mismatched, namely, the tampered flight route is unreasonable. For example, after tampering, the position of the aircraft at a certain moment is a, and the position of the aircraft at the next moment is B, however, based on the flight state (e.g., speed and acceleration) of the aircraft at the position a, it is impossible to fly from the position a to the position B in the time interval between the two moments, thereby causing a mismatch between the flight state and the position, i.e., unreasonable route.
According to one embodiment of the invention, whether all random modification instructions tamper with successful simulated flight data or possibly only a portion of random modification instructions tamper with successful second flight data, there is a possibility of unreasonable routes as long as there is tamper-successful data. But the two are different in unreasonable degree, whether the data amount of the second flight data tampered with is large or not can be determined based on the difference in unreasonable degree of the two, namely, the tamper-proof security of the flight data recording assembly is evaluated.
According to one embodiment of the present invention, to determine the difference in the degree of irrational degree of both, irrational degree of the route of both may be determined separately. For example, one flight path may be determined based on tampered location data in the simulated flight data, and one flight path may be determined based on flight status data in the simulated flight data, with the path irrational nature of the simulated flight data being determined based on the difference between the two flight paths. Similarly, one flight path may be determined based on tampered location data in the second flight data, and one flight path may be determined based on flight status data in the second flight data, with the path irrational of the second flight data being determined based on the difference between the two flight paths.
According to one embodiment of the invention, the simulated flight path may be determined from simulated position data in the simulated flight data. For example, the position information of each moment in the simulated flight data may be curve-fitted, and the obtained smooth curve may be used as the simulated flight path.
According to one embodiment of the present invention, a simulated theoretical flight path may be determined based on simulated flight state data at each time in simulated flight data, for example, a position at a certain time, and a speed, an acceleration, a pitch angle, a yaw angle, and a roll angle may be acquired, and a speed, an acceleration, and a direction of flight may be determined based on the speed, the acceleration, the pitch angle, the yaw angle, and the roll angle, so that the flight is performed at the speed, the acceleration, and the direction of the flight within a time interval between two times with the position at the certain time as a starting point, thereby determining a position at the next time.
According to one embodiment of the present invention, determining a simulated theoretical flight path from simulated flight state data in the simulated flight data includes: determining the simulation position data of the 1 st recording time as the simulation theoretical position data of the 1 st recording time; according to the speed data, the acceleration data, the pitch angle data, the yaw angle data and the rolling angle data in the flight state data at each recording moment and the simulated theoretical position data at the j-th recording moment, determining the simulated theoretical position data at the j+1th moment, wherein j is a positive integer greater than or equal to 1; fitting the simulated theoretical position data of each recording moment to obtain the simulated theoretical flight route.
According to one embodiment of the present invention, it may be assumed that the simulated flight route and the start point of the simulated theoretical flight route are identical, and thus, the simulated position data at the 1 st recording time may be determined as the simulated theoretical position data at the 1 st recording time, that is, the start point of the simulated theoretical flight route. Further, the flight speed, acceleration and direction at the 1 st recording time may be determined based on the speed data, acceleration data, pitch angle data, yaw angle data, roll angle data at the 1 st recording time, and it is assumed that the flight is performed at the flight speed, acceleration and direction in a period between the 1 st to 2 nd recording times, so that the simulated theoretical position data at the 2 nd recording time may be determined based on the start point, the flight speed, acceleration and direction. And so on, after determining the simulated theoretical position data of the jth recording moment, determining the speed data, the acceleration data, the pitch angle data, the yaw angle data and the roll angle data of the jth recording moment, thereby determining the flight speed, the acceleration and the direction of the jth recording moment, and supposing that the jth recording moment and the (j+1) th recording moment fly according to the flight speed, the acceleration and the direction in the time period between the jth recording moment and the (j+1) th recording moment, thereby determining the simulated theoretical position data of the jth recording moment based on the simulated theoretical position data of the jth recording moment and the flight speed, the acceleration and the direction. After the simulated theoretical position data of all the recording moments are obtained, the simulated theoretical position data of all the recording moments can be fitted, and a simulated theoretical flight route is obtained.
According to one embodiment of the present invention, similarly, it may be assumed that the second flight route and the start point of the second theoretical flight route are identical, and therefore, the second position data at the 1 st recording time may be determined as the second theoretical position data at the 1 st recording time, that is, the start point of the second theoretical flight route. Further, the flight speed, acceleration, and direction at the 1 st recording time may be determined based on the speed data, acceleration data, pitch angle data, yaw angle data, and roll angle data at the 1 st recording time, and it is assumed that the flight is performed at the flight speed, acceleration, and direction in a period between the 1 st to 2 nd recording times, so that the second theoretical position data at the 2 nd recording time may be determined based on the start point, and the flight speed, acceleration, and direction. And so on, after determining the second theoretical position data of the jth recording time, determining the speed data, the acceleration data, the pitch angle data, the yaw angle data and the roll angle data of the jth recording time, thereby determining the flight speed, the acceleration and the direction of the jth recording time, and supposing that the jth recording time and the jth recording time are in a time period between the jth recording time and the jth+1th recording time, according to the flight speed, the acceleration and the direction, determining the second theoretical position data of the jth recording time based on the second theoretical position data of the jth recording time and the flight speed, the acceleration and the direction. After the second theoretical position data of all the recording moments are obtained, the second theoretical position data of all the recording moments can be fitted, and a second theoretical flight route is obtained.
According to one embodiment of the invention, as described above, route irrational of the simulated flight data may be determined based on the difference between the simulated flight route and the simulated theoretical flight route. Similarly, route irrational of the second flight data may be determined based on a difference between the second flight route and the second theoretical flight route. And may determine whether the amount of data of the second flight data tampered with is large based on a difference in irrational nature of the two routes, i.e., evaluating tamper-resistant security of the flight data recording assembly.
According to one embodiment of the invention, determining a route rationality score from the simulated flight route, the simulated theoretical flight route, the second flight route, and the second theoretical flight route comprises:
determining the route rationality score according to equation (2)，
Formula (2)
Wherein,indicating the position on the second flight path at time t,indicating the position on the second theoretical flight path at time t,indicating the position on the simulated flight path at time t,indicating the position of the moment t on the simulated theoretical flight path,/->For the 1 st recording instant>For the last recording moment +.>。
According to one embodiment of the present invention, in the formula (2), the numerator of the divided portion is the absolute value of the difference value of the curve integral of the second flight path and the second theoretical flight path, and may be used to represent the sum of the differences of the second flight path and the second theoretical flight path at all times, that is, the total difference of the second flight path and the second theoretical flight path, which may be used to describe the degree of unreasonability of the second flight path.
According to one embodiment of the present invention, in the formula (2), the denominator of the denominator portion is an absolute value of a difference value of curve integral of the simulated flight path and the simulated theoretical flight path, and can be used to represent a sum of differences of the simulated flight path and the simulated theoretical flight path at all times, that is, a total difference of the simulated flight path and the simulated theoretical flight path, which can be used to describe an unreasonable degree of the simulated flight path.
According to one embodiment of the present invention, the partial formula of equation (2) may then represent a ratio between the degree of irrational of the second flight path and the degree of irrational of the simulated flight path. The larger the ratio is, the closer the unreasonable degree of the second flight route is to the unreasonable degree of the simulated flight route is, the larger the data amount of the second flight data which is tampered successfully is, the closer the data amount of the second flight data is to the simulated flight data is, and the lower the tamper-proof safety of the flight data recording component is. Conversely, the smaller the ratio is, the larger the difference between the irrational degree of the second flight route and the irrational degree of the simulated flight route is, the smaller the data amount of the second flight data which is tampered successfully is, the larger the difference between the second flight data and the simulated flight data is, and the higher the tamper-proof safety of the flight data recording assembly is.
According to one embodiment of the present invention, by subtracting the above ratio from 1, a route rationality score may be obtained, and a higher route rationality score may indicate a smaller above ratio and may also indicate a higher tamper-resistant security of the flight data recording assembly, whereas a lower route rationality score may indicate a higher above ratio and may also indicate a lower tamper-resistant security of the flight data recording assembly.
In this way, the similarity of the second flight data to the first flight data that has not been tampered with can be determined based on the first similarity score, thereby determining the size of the amount of data tampered with in the second flight data to determine the tamper-resistant security of the flight data recording assembly. The approach degree of the second flight data and the simulated flight data can be determined from the angle of the unreasonable degree of the second flight route corresponding to the second flight data and the simulated flight route corresponding to the simulated flight data, so that the magnitude of the tampered data amount in the second flight data is determined, and the tamper-resistant safety of the flight data recording assembly is determined. Therefore, the data tamper-proof safety of the flight data recording assembly can be evaluated from multiple angles, and the accuracy and objectivity of the flight data tamper-proof safety scoring are improved.
According to one embodiment of the invention, in addition to evaluating the tamper-resistant security of the data of the flight data recording assembly, the tamper-resistance of the flight control system during actual operation can also be evaluated. In step S105, the test device may be connected to the flight control system, and in step S106, the test control signal and the random disturbance signal may be transmitted to the flight control system. The test control signal is a control signal for testing the function of the flight control system, and can be used for controlling the flight control system, for example, controlling a flap, an aileron, a spoiler, a blocking surface, a tail wing and the like of the flight control system, so that the components move to a state corresponding to the test control signal, for example, the tail wing moves to an angle corresponding to the test control signal and the like. Random jamming signals may be used to simulate various disturbances in flight, such as electromagnetic wave disturbances, vibration disturbances, high temperature or low temperature disturbances, as well as to simulate malicious intrusion signals, such as signals that simulate malicious intrusion into and malicious manipulation of the flight control system.
According to one embodiment of the invention, in step S107, response data of the flight control system, i.e. the actual response of the flight control system under the influence of the random disturbance signal, may be collected. In an example, the state of the actual movement of the above-described components may be acquired, e.g. the actual angle of the flight under the influence of random disturbance signals, etc.
According to one embodiment of the invention, in step S108, a flight tamper resistant safety score may be determined based on the test control signals and the response data of the flight control system. For example, the flight tamper-resistant safety score may be determined based on the state of the component corresponding to the test control signal and the deviation between the actual states of the component acquired under the interference of the random interference signal, where the smaller the deviation, the higher the flight tamper-resistant safety score and the better the tamper-resistant of the flight control system.
According to one embodiment of the present invention, step S108 may include: according to the test control signals, determining theoretical response data of each test moment of the flight control system; determining response difference data of each test moment according to the theoretical response data of each test moment and the response data of each moment; and determining the flight anti-interference safety score according to the response difference data of each test moment and the theoretical response data of each moment.
According to one embodiment of the present invention, different test control signals and random disturbance signals may be transmitted to the flight control system at a plurality of test moments, and theoretical response data corresponding to the test control signals transmitted at the respective test moments, that is, data describing states of the above-described components corresponding to the respective test control signals, for example, theoretical angles of the tail wing, etc., may be determined.
According to one embodiment of the present invention, the absolute value of the difference between the theoretical response data at each time and the response data at each time is the response difference data at each time, for example, the deviation between the theoretical angle of the tail wing and the actual angle of the tail wing, etc.
According to one embodiment of the invention, determining the flight anti-interference safety score according to the response difference data of each test moment and the theoretical response data of each moment comprises: determining the flight tamper resistant safety score according to equation (3)，
Formula (3)
Wherein,，/>normalized data of kth response difference data for the s-th test moment, ++>Normalized data of the kth theoretical response data for the s-th test moment, +.>K is the K response data of the S-th test moment, K is the total number of types of the response data, S is the total number of the test moments, K is less than or equal to K, S is less than or equal to S, and K, K, S and S are positive integers.
According to one embodiment of the present invention, in order to unify the dimensions of the respective response data and theoretical corresponding data, the kth response difference data at the s-th test time and the kth theoretical response data at the s-th test time may be normalized, The ratio of normalized data of the kth response difference data at the s-th test time to normalized data of the kth theoretical response data at the s-th test time may represent the ratio of the deviation between the actual response data and the theoretical response data. Summing the ratio of the deviation between the response data of a plurality of types at each moment and the theoretical response data to obtain a deviation ratio at each moment, summing the deviation ratios at each moment to obtain a total deviation ratio, dividing the total deviation ratio by the product of the total number of types of the response data and the total number of test moments to obtain an average deviation ratio, wherein the higher the average deviation ratio is, the larger the deviation between the response data and the theoretical response data is, which indicates that the more obvious the disturbance suffered by the flight control system is, and the worse the anti-disturbance capability of the flight control system is, otherwise, the lower the average deviation ratio is, the response data and the theoretical response data areThe smaller the deviation of the response data, the less obvious the disturbance to the flight control system is, and the stronger the anti-disturbance capability of the flight control system is. The flight anti-interference safety score can be obtained by subtracting the average deviation proportion from 1, and the higher the flight anti-interference safety score is, the stronger the anti-interference capability of the flight control system is indicated, otherwise, the lower the flight anti-interference safety score is, the weaker the anti-interference capability of the flight control system is indicated.
By the method, deviation between actual response data and theoretical response data of the flight control system under the interference of the random interference signals can be determined, the flight anti-interference safety score is determined based on the deviation, and accuracy and objectivity of the flight anti-interference safety score are improved.
According to one embodiment of the present invention, in step S109, the flight data tamper-resistant security score and the flight tamper-resistant security score may be weighted and summed to obtain a data security score for the avionics system, thereby comprehensively representing the data security of the avionics system in terms of both tamper-resistant capabilities of the flight data recording component and tamper-resistant capabilities of the flight control system.
According to the data security analysis method of the avionic system, the flight control system can be tested through the random interference signals, so that the flight control system can be tested under any random conditions, and compared with a fixed test mode, the anti-interference performance of the flight control system under special conditions can be tested more easily through the random interference signals, and the flight security is improved. Moreover, the anti-tampering safety of the flight data can be tested by randomly modifying the instruction, so that the loopholes of the flight data recording assembly can be found, the flight data is not easily affected by the environment, the tampering is not easily performed, and the storage safety of the flight data is improved. When evaluating the tamper-resistant capability of the flight data recording assembly, the similarity of the second flight data to the first flight data that is not tampered with can be determined based on the first similarity score, thereby determining the size of the amount of tampered data in the second flight data to determine the tamper-resistant security of the flight data recording assembly. The approach degree of the second flight data and the simulated flight data can be determined from the angle of the unreasonable degree of the second flight route corresponding to the second flight data and the simulated flight route corresponding to the simulated flight data, so that the magnitude of the tampered data amount in the second flight data is determined, and the tamper-resistant safety of the flight data recording assembly is determined. Therefore, the data tamper-proof safety of the flight data recording assembly can be evaluated from multiple angles, and the accuracy and objectivity of the flight data tamper-proof safety scoring are improved. When the anti-interference capability of the flight control system is evaluated, the deviation between actual response data and theoretical response data of the flight control system under the interference of random interference signals can be determined, the flight anti-interference safety score is determined based on the deviation, and the accuracy and objectivity of the flight anti-interference safety score are improved.
Fig. 2 schematically shows a block diagram of a data security analysis system of an avionics system according to an embodiment of the invention, as shown in fig. 2, the system comprising: a first flight data module 101, configured to connect the test device to a flight data recording component, and obtain first flight data, where the first flight data is a data set for recording a flight state and a position at each recording time; a second flight data module 102, configured to send a random modification instruction to the flight data recording component, and obtain second flight data; a simulated flight data module 103, configured to generate simulated flight data according to the first flight data and the random modification instruction; a flight data tamper-resistant security scoring module 104 configured to determine a flight data tamper-resistant security score based on the simulated flight data, the first flight data, and the second flight data; a connection module 105 for connecting the test device to a flight control system; a transmitting module 106, configured to generate a test control signal and transmit the test control signal to the flight control system, and generate a random interference signal and transmit the random interference signal to the flight control system; an acquisition module 107 for acquiring response data of the flight control system; a flight anti-interference security scoring module 108 configured to determine a flight anti-interference security score according to the test control signal and the response data of the flight control system; the data security scoring module 109 is configured to determine a data security score of the avionics system according to the flight data tamper resistant security score and the flight tamper resistant security score.
According to one embodiment of the present invention, there is provided a data security analysis device for an avionics system, comprising: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to invoke the memory-stored instructions to perform a data security analysis method of the avionics system.
According to one embodiment of the invention, a computer-readable storage medium is provided, on which computer program instructions are stored which, when executed by a processor, implement a data security analysis method of the avionics system.
The present invention may be a method, apparatus, system, and/or computer program product. The computer program product may include a computer readable storage medium having computer readable program instructions embodied thereon for performing various aspects of the present invention.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are by way of example only and are not limiting. The objects of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been shown and described in the examples and embodiments of the invention may be modified or practiced without departing from the principles described.
Claims (4)
1. A method of data security analysis for an avionics system, comprising: connecting test equipment to a flight data recording assembly and acquiring first flight data, wherein the first flight data is a data set for recording the flight state and the position of each recording moment; sending a random modification instruction to the flight data recording component, and acquiring second flight data; generating simulated flight data according to the first flight data and the random modification instruction; determining a tamper-resistant security score for the flight data according to the simulated flight data, the first flight data and the second flight data; connecting the test equipment to a flight control system; generating a test control signal and sending the test control signal to the flight control system, and generating a random interference signal and sending the random interference signal to the flight control system; collecting response data of the flight control system; determining a flight anti-interference safety score according to the test control signal and the response data of the flight control system; determining a data security score of an avionics system according to the flight data tamper-resistant security score and the flight tamper-resistant security score;
Determining a flight data tamper-resistant security score from the simulated flight data, the first flight data, and the second flight data, comprising: determining a first similarity score from the first flight data and the second flight data; determining a simulated flight route according to simulated position data in the simulated flight data, wherein the simulated position data is used for representing position information recorded in the simulated flight data at each recording moment; determining a simulated theoretical flight route according to the simulated flight state data in the simulated flight data, wherein the simulated flight state data are used for representing flight states recorded in the simulated flight data at each recording moment, the flight states comprise the speed, the acceleration, the pitch angle, the yaw angle and the roll angle of the aircraft, and the simulated theoretical flight route is a theoretical route when the aircraft flies based on the simulated flight state data; determining a second flight route according to second position data in the second flight data, wherein the second position data is used for representing position information recorded in the second flight data at each recording moment; determining a second theoretical flight route according to second flight state data in the second flight data, wherein the second flight state data are used for representing flight states recorded in the second flight data at each recording moment, and the second theoretical flight route is a theoretical route when the aircraft flies based on the second flight state data; determining a route rationality score from the simulated flight route, the simulated theoretical flight route, the second flight route, and the second theoretical flight route; determining the tamper-resistant security score for the flight data according to the first similarity score and the route rationality score;
Determining a first similarity score from the first flight data and the second flight data, comprising: obtaining first flight data vectors of a plurality of recording moments according to the first flight data of the plurality of recording moments; obtaining second flight data vectors of the plurality of recording moments according to the second flight data of the plurality of recording moments; according to the formulaDetermining the first similarity score S 1 Wherein F is 1，i For the first flight data vector at the ith recording time, F 2，i The second flight data vector is the second flight data vector at the ith recording moment, N is the total number of the recording moments, i is less than or equal to N, and both i and N are positive integers;
determining a simulated theoretical flight route according to the simulated flight state data in the simulated flight data, including: determining the simulation position data of the 1 st recording time as the simulation theoretical position data of the 1 st recording time; according to the speed data, the acceleration data, the pitch angle data, the yaw angle data and the rolling angle data in the flight state data at each recording moment and the simulated theoretical position data at the j-th recording moment, determining the simulated theoretical position data at the j+1th moment, wherein j is a positive integer greater than or equal to 1; fitting the simulated theoretical position data of each recording moment to obtain the simulated theoretical flight route;
Determining a route rationality score from the simulated flight route, the simulated theoretical flight route, the second flight route, and the second theoretical flight route, comprising: according to the formulaDetermining the route rationality score L r Wherein { x 2 (t)，y 2 (t)，z 2 (t) } represents the position on the second flight path at time t, { x 2T (t)，y 2T (t)，z 2T (t) } represents the position on the second theoretical flight path at time t, { x } M (t)，y M (t)，z M (t) } represents the position on the simulated flight path at time t, { x MT (t)，y MT (t)，z MT (t) } represents the position on the simulated theoretical flight path at time t, t 1 For the 1 st recording time, t N For the last recording time, t 1 ≤t≤t N ；
Determining a flight anti-tamper security score from the test control signal and the response data of the flight control system, comprising: according to the test control signals, determining theoretical response data of each test moment of the flight control system; determining response difference data of each test moment according to the theoretical response data of each test moment and the response data of each moment; determining the flight anti-interference safety score according to the response difference data of each test moment and the theoretical response data of each moment;
determining the flight anti-interference safety score according to the response difference data of each test moment and the theoretical response data of each moment, wherein the method comprises the following steps: according to the formula Determining the flight tamper resistant safety score I A Wherein, deltaμ k，s ＝|μ T，k，s -μ k，s |，Δμ k，s Normalized data, μ, for the kth response difference data at the s-th test time T，k，s Normalized data, μ, for the kth theoretical response data at the s-th test time k，s K is the kth response data at the S-th test moment, K is the total number of types of the response data, S is the total number of the test moments, K is less than or equal to K, S is less than or equal to S, and K, K, S and S are positive integers;
determining a data security score for an avionics system based on the flight data tamper resistant security score and the flight tamper resistant security score, comprising: and carrying out weighted summation on the flight data tamper-resistant safety score and the flight tamper-resistant safety score to obtain the data safety score of the avionic system.
2. A data security analysis system for an avionics system, comprising: the first flight data module is used for connecting the test equipment to the flight data recording assembly and acquiring first flight data, wherein the first flight data is a data set for recording the flight state and the position of each recording moment; the second flight data module is used for sending a random modification instruction to the flight data recording component and acquiring second flight data; the simulated flight data module is used for generating simulated flight data according to the first flight data and the random modification instruction; the flight data tamper-proof safety scoring module is used for determining a flight data tamper-proof safety score according to the simulated flight data, the first flight data and the second flight data; a connection module for connecting the test device to a flight control system; the transmission module is used for generating a test control signal and transmitting the test control signal to the flight control system, and generating a random interference signal and transmitting the random interference signal to the flight control system; the acquisition module is used for acquiring response data of the flight control system; the flight anti-interference safety scoring module is used for determining flight anti-interference safety scores according to the test control signals and response data of the flight control system; the data security scoring module is used for determining the data security score of the avionics system according to the flight data tamper-resistant security score and the flight tamper-resistant security score;
Determining a flight data tamper-resistant security score from the simulated flight data, the first flight data, and the second flight data, comprising: determining a first similarity score from the first flight data and the second flight data; determining a simulated flight route according to simulated position data in the simulated flight data, wherein the simulated position data is used for representing position information recorded in the simulated flight data at each recording moment; determining a simulated theoretical flight route according to the simulated flight state data in the simulated flight data, wherein the simulated flight state data are used for representing flight states recorded in the simulated flight data at each recording moment, the flight states comprise the speed, the acceleration, the pitch angle, the yaw angle and the roll angle of the aircraft, and the simulated theoretical flight route is a theoretical route when the aircraft flies based on the simulated flight state data; determining a second flight route according to second position data in the second flight data, wherein the second position data is used for representing position information recorded in the second flight data at each recording moment; determining a second theoretical flight route according to second flight state data in the second flight data, wherein the second flight state data are used for representing flight states recorded in the second flight data at each recording moment, and the second theoretical flight route is a theoretical route when the aircraft flies based on the second flight state data; determining a route rationality score from the simulated flight route, the simulated theoretical flight route, the second flight route, and the second theoretical flight route; determining the tamper-resistant security score for the flight data according to the first similarity score and the route rationality score;
Determining a first similarity score from the first flight data and the second flight data, comprising: obtaining first flight data vectors of a plurality of recording moments according to the first flight data of the plurality of recording moments; obtaining second flight data vectors of the plurality of recording moments according to the second flight data of the plurality of recording moments; according to the formulaDetermining the first similarity score S 1 Wherein F is 1，i For the first flight data vector at the ith recording time, F 2，i The second flight data vector is the second flight data vector at the ith recording moment, N is the total number of the recording moments, i is less than or equal to N, and both i and N are positive integers;
determining a simulated theoretical flight route according to the simulated flight state data in the simulated flight data, including: determining the simulation position data of the 1 st recording time as the simulation theoretical position data of the 1 st recording time; according to the speed data, the acceleration data, the pitch angle data, the yaw angle data and the rolling angle data in the flight state data at each recording moment and the simulated theoretical position data at the j-th recording moment, determining the simulated theoretical position data at the j+1th moment, wherein j is a positive integer greater than or equal to 1; fitting the simulated theoretical position data of each recording moment to obtain the simulated theoretical flight route;
Determining a route rationality score from the simulated flight route, the simulated theoretical flight route, the second flight route, and the second theoretical flight route, comprising: according to the formulaDetermining the route rationality score L r Wherein { x 2 (t)，y 2 (t)，z 2 (t) } represents the position on the second flight path at time t, { x 2T (t)，y 2T (t)，z 2T (t) } represents the position on the second theoretical flight path at time t, { x } M (t)，y M (t)，z M (t) } represents the position on the simulated flight path at time t, { x MT (t)，y MT (t)，z MT (t) } represents the position on the simulated theoretical flight path at time t, t 1 For the 1 st recording time, t N For the last recording time, t 1 ≤t≤t N ；
Determining a flight anti-tamper security score from the test control signal and the response data of the flight control system, comprising: according to the test control signals, determining theoretical response data of each test moment of the flight control system; determining response difference data of each test moment according to the theoretical response data of each test moment and the response data of each moment; determining the flight anti-interference safety score according to the response difference data of each test moment and the theoretical response data of each moment;
determining the flight anti-interference safety score according to the response difference data of each test moment and the theoretical response data of each moment, wherein the method comprises the following steps: root of Chinese character According to the formulaDetermining the flight tamper resistant safety score I A Wherein, deltaμ k，s ＝|μ T，k，s -μ k，s |，Δμ k，s Normalized data, μ, for the kth response difference data at the s-th test time T，k，s Normalized data, μ, for the kth theoretical response data at the s-th test time k，s K is the kth response data at the S-th test moment, K is the total number of types of the response data, S is the total number of the test moments, K is less than or equal to K, S is less than or equal to S, and K, K, S and S are positive integers;
determining a data security score for an avionics system based on the flight data tamper resistant security score and the flight tamper resistant security score, comprising: and carrying out weighted summation on the flight data tamper-resistant safety score and the flight tamper-resistant safety score to obtain the data safety score of the avionic system.
3. A data security analysis device for an avionics system, comprising: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to invoke the memory-stored instructions to perform the method of claim 1.
4. A computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the method of claim 1.
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