CN102624515A - Data transmission method, system and terminals - Google Patents
Data transmission method, system and terminals Download PDFInfo
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- CN102624515A CN102624515A CN201110378318XA CN201110378318A CN102624515A CN 102624515 A CN102624515 A CN 102624515A CN 201110378318X A CN201110378318X A CN 201110378318XA CN 201110378318 A CN201110378318 A CN 201110378318A CN 102624515 A CN102624515 A CN 102624515A
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Abstract
The invention discloses a data transmission method, a system and terminals, which are used for improving security of data transmission in CAN (controller area network)-Bus communication. The method includes generating a check code by a first terminal according to a random code and data information to be transmitted; combining the random code, the data information to be transmitted and the check code into a heartbeat package according to a set sequence; transmitting the heartbeat package to a second terminal via a CAN-Bus of the local area network bus technology of a controller; leading the second terminal to decode the received heartbeat package; obtaining the data information to be transmitted from the heartbeat package when a decoded check code is identical to the check code in the received heartbeat package; and processing the data information.
Description
Technical field
The present invention relates to the field bus technique field, particularly a kind of method of transfer of data, system and terminal.
Background technology
(Controller Area Network-BUS CAN-Bus) belongs to the category of industrial field bus, is the local communication network of new generation of fieldbus for Controller Area Network BUS technology.CAN-Bus is a serial protocol, and all participate in the subsystem of CAN-Bus can carry out the transmission and the reception of data through the CAN EBI on the control unit of this subsystem.He has designed high efficiency arbitration mechanism and has solved the transmission collision problem, and the system with high priority can preferentially obtain the right to use of bus.
At present, in the CAN-Bus communication, in order to reduce the communication load of controller computational burden and CAN-Bus, having ignored the transmission heartbeat packet and carried out this step of verification, perhaps, even sent heartbeat packet, also basically all is simple fixed data coupling.Confidentiality and fail safe to the data of CAN-Bus communication transmission all brought very big hidden danger like this.
Summary of the invention
The embodiment of the invention provides a kind of method, system and terminal of transfer of data, in order to improve safety of data transmission in the CAN-Bus communication.
The embodiment of the invention provides a kind of method of transfer of data, comprising:
First terminal generates check code according to random code and data message waiting for transmission;
Said random code, said data message waiting for transmission and said check code are formed heartbeat packet by the sequential combination of setting; And send to second terminal through Controller Area Network BUS technology CAN-Bus; The said heartbeat packet that makes said second end-on receive is decoded; And when first check code that decodes is consistent with the check code in the heartbeat packet that receives, from said heartbeat packet, obtains said data message waiting for transmission and carry out information processing.
The embodiment of the invention provides a kind of system of transfer of data, comprising:
First terminal; Be used for generating check code according to random code and data message waiting for transmission; Said random code, said data message waiting for transmission and said check code are formed heartbeat packet by the sequential combination of setting, and send to second terminal through Controller Area Network BUS technology CAN-Bus;
Second terminal; Be used for receiving said heartbeat packet through CAN-Bus; Said heartbeat packet to receiving is decoded, and when first check code that decodes is consistent with the check code in the heartbeat packet that receives, from said heartbeat packet, obtains said data message waiting for transmission and carry out information processing.
The embodiment of the invention provides a kind of terminal of transfer of data, comprising:
Generation unit is used for generating check code according to random code and data message waiting for transmission;
Assembled unit is used for said random code, said data message waiting for transmission and said check code are formed heartbeat packet by the sequential combination of setting;
Transmitting element is used for sending said heartbeat packet through Controller Area Network BUS technology CAN-Bus.
In the embodiment of the invention; In the CAN-Bus communication, first terminal generates check code according to random code and data message waiting for transmission, with said random code; Said data message waiting for transmission and said check code form heartbeat packet by the sequential combination of setting; And send to second terminal through Controller Area Network BUS technology CAN-Bus, like this, the said heartbeat packet that this second end-on is received is decoded; And when first check code that decodes is consistent with the check code in the heartbeat packet that receives, from said heartbeat packet, obtains said data message waiting for transmission and carry out information processing.Thereby; Utilize random code and data message waiting for transmission to generate check code, carry out the encryption of heartbeat packet, improved the difficulty that cracks; And; Data message waiting for transmission is blended in the heartbeat packet to encrypt together sends, the fail safe that has improved these data messages has also improved the use value of heartbeat packet.
Description of drawings
Fig. 1 is the flow chart of transfer of data in the embodiment of the invention;
Fig. 2 is the Organization Chart of visit data transmission system in the embodiment of the invention;
Fig. 3 is the structure chart of data transmission terminal in the embodiment of the invention.
Embodiment
In the embodiment of the invention, data message waiting for transmission is blended in the heartbeat packet, and this heartbeat packet has adopted the mode of dynamic encryption, thereby, not only improved safety of data transmission, also improved the utilance of heartbeat packet.
Referring to Fig. 1, the process of transfer of data comprises in the CAN-Bus communication of the embodiment of the invention:
Step 101: first terminal generates check code according to random code and data message waiting for transmission.
In the embodiment of the invention, in heartbeat packet, disposed a check code, this check code can be generated by random code and data message waiting for transmission.
In the embodiment of the invention, also dispose random code in the heartbeat packet, like this, carry out cryptographic calculation, generate check code through random code and data message waiting for transmission.
Be further to improve the fail safe of heartbeat packet, the detailed process that generates check code comprises: first terminal generates a random code, judges whether non-zero of this random code then; And the random code of this random code during whether with last transfer of data is identical; When this random code non-zero, and the random code during with last transfer of data is not simultaneously, can be according to data message waiting for transmission; And random code is carried out cryptographic calculation, the generation check code.
Here, can generate random code according to the hardware state at first terminal.For example: according to some transducers in first terminal, the quantity of state of switch, and random code of current time computing.
The mode of carrying out cryptographic calculation according to random code and data message waiting for transmission can be varied.For example: obtain one and set code; When the highest order of setting code is 0; Code with data message waiting for transmission and random code and setting carries out division arithmetic respectively, obtains corresponding remainder, and remainder is added up; The code of code after adding up and setting is carried out XOR, obtain check code.When the highest order of setting code is 1; After the whole negate of the code of setting; Respectively the code after data message waiting for transmission and random code and the negate is carried out division arithmetic, obtain corresponding remainder, and remainder is added up; The code of code after adding up and setting is carried out XOR, obtain check code.
Above-mentioned is the process that a kind of cryptographic calculation generates check code; The embodiment of the invention is not limited thereto certainly, also can the code of data message waiting for transmission and random code and setting be carried out other computing, for example: multiplication; Adding up in last position that will obtain data then, obtains check code.Perhaps, directly random code and data message waiting for transmission are carried out XOR and accumulate then, obtain check code.Of the prior artly utilize random code to carry out encrypted process can be applied to this, detailed process is just no longer tired to be stated.
Step 102: first terminal forms heartbeat packet with random code, data message waiting for transmission and check code by the sequential combination of setting.
Generated check code in the above-mentioned steps, at this moment, only needed the configuration heartbeat packet, comprised in the heartbeat packet after the configuration: random code, data message waiting for transmission and check code.Be about to data message waiting for transmission, random code, and check code forms heartbeat packet by the sequential combination of setting.
Step 103: first terminal sends to second terminal with the heartbeat packet that forms through CAN-Bus.
The embodiment of the invention is applied in the CAN-Bus communication, and therefore, first terminal sends to second terminal with the heartbeat packet that forms through CAN-Bus.
Step 104: second terminal receives heartbeat packet through CAN-Bus.
Step 105: the heartbeat packet that second end-on is received is decoded, and obtains first check code.
Second terminal at first according to the order of setting, is identified random number respectively from heartbeat packet, data message waiting for transmission and effect sign indicating number.Then, respectively data message waiting for transmission and stochastic arithmetic are carried out computing, obtain the first effect sign indicating number.Here, calculating process is corresponding with the calculating process that step 101 generates check code.
Step 106: whether second terminal judges, first check code is consistent with the check code in the heartbeat packet that receives, if consistent, then execution in step 107, otherwise, execution in step 108.
Here, first check code and check code in the heartbeat packet that receives are compared,, then show transmission course safety if consistent, but execution in step 107.If inconsistent, the heartbeat packet of then receiving is unsafe, execution in step 108.
Step 107: second terminal obtains data message waiting for transmission and carries out information processing from heartbeat packet.
Like this, data information transmission process waiting for transmission has been accomplished.
Step 108: second terminal abandons heartbeat packet.
Because the heartbeat packet that receive at second terminal is unsafe, therefore, abandons this heartbeat packet, data message is not wherein handled.
Can know that through above-mentioned data transmission procedure the random number in the heartbeat packet is dynamically to generate, and is non-zero; And the random code during with last transfer of data is different, and data message waiting for transmission is also inequality, thereby; The check code that generates is a dynamically changeable, has guaranteed the reliability of heartbeat packet.Like this, data message waiting for transmission is blended in the heartbeat packet, has not only improved safety of data transmission, also improved the utilance of heartbeat packet.
With way of example embodiment of the present invention is described below.
In the present embodiment, data message waiting for transmission is two, and for example: data message waiting for transmission is 1001,0110.
At first, the code that obtains a setting is 1011, because this code highest order is " 1 ", therefore, with the whole negate of this code, just becomes and encrypts multinomial 0100.
Then, first terminal can draw a random code through certain algorithm.For example: the quantity of state with current time and some sensor status, switch calculates a random code.Afterwards, judge that whether this random code is zero, if not zero judge whether this random number is whether the random number that generates consistent with transmission last time, soon itself and when transmitting last time the random number of appearance compare.For example: the random code that drew last time is 0101, and what draw specifically is 0000, does not satisfy " non-zero " condition, and drawing random code once more is 0101, does not satisfy " unique " condition again, and drawing random code once more is 1011, is legal random code.
After obtaining legal random code, remove to encrypt multinomial 0100 with random code 1011, getting remainder is 0011.
Data message waiting for transmission is carried out division arithmetic with the encryption multinomial respectively, get its remainder and be respectively 0001,0010.
Again above three groups of remainders are added up, obtain 0110.
To go up code 1011 XORs that go on foot 0110 and the setting that obtain then, the check code that obtains at last is 1101.
Become heartbeat packet by the sequential combination of setting at last, such as can being 1,011 1,001 0,110 1101.
First terminal sends to second terminal with this heartbeat packet through CAN-Bus, the legitimacy that the whole data message of verification is then come according to the heartbeat packet of obtaining in second terminal.Specifically comprise: the heartbeat packet that second end-on is received is decoded, identification check code wherein, random code; And data message waiting for transmission, utilize the inverse operation that generates check code then, obtain first check code according to random code that identifies and data message waiting for transmission; Check code in the heartbeat packet of this first check code and reception is compared, if consistent, for example; All be 1101, then this heartbeat packet is legal, and the data message waiting for transmission that can extract is wherein handled; Otherwise this heartbeat packet is illegal.
In the above-mentioned specific embodiment, the code of setting can adopt outside self-defining, join in the generative process of check code after, improved the difficulty that cracks of heartbeat packet.And, and in transportation, adopt byte or nibble computing, improve encryption or decrypted data, and then improved the speed of transfer of data.
In the embodiment of the invention; Can some important informations be mixed into heartbeat packet; And carry out cryptographic calculation together, such as the warning message at two terminals, security strategy, limiting command etc., with these important informations as data message waiting for transmission; Be mixed into heartbeat packet, and participated in the calculating of check code.Thereby, the Hybrid Encryption through heartbeat packet and send can these information of better protection fail safe.
Employed electronic control system and communication system are more and more in the Hyundai Motor; Like engine electric-controlled system, anti-lock braking system (ABS), automatic cruising system (ACC) and in-vehicle multi-media system; Between these systems, between system and the automobile Displaying Meter, all need carry out exchanges data between system and the vehicle fault diagnosis system; Therefore, employing has become inevitable choice with the CAN-Bus communication system in automotive system.For example: adopt CAN Open2.0 communication between remote service terminating machine (RSU) in the automobile and the controller (ECU); The CAN communication module that uses is CTM8251AT; The heartbeat packet of sending between them is 8 bytes; Adopt the configuration of a byte random code and a byte check code to send heartbeat packet.A series of key messages such as in the embodiment of the invention, tamper information, the lock car that can mix various antennas in this heartbeat packet the inside instructs, lock vehicle type will be about to these information as data message waiting for transmission; Participate in the generation of the check code of heartbeat packet, and sneak in the heartbeat packet, thereby; Heartbeat packet has adopted the mode of dynamic encryption; Thereby, not only improved safety of data transmission, also improved the utilance of heartbeat packet.
The system of the transfer of data that provides in the embodiment of the invention, as shown in Figure 2, comprising: first terminal 100 and second terminal 200.Wherein,
During the mode that first terminal 100 generates check code has a lot, wherein,
Preferably, first terminal 100 specifically is used for obtaining to set code; When the highest order of setting code is 0; Code with data message waiting for transmission and random code and setting carries out division arithmetic respectively, obtains corresponding remainder, and remainder is added up; The code of code after adding up and setting is carried out XOR, obtain check code; When the highest order of setting code is 1; After the whole negate of the code of setting; Respectively the code after data message waiting for transmission and random code and the negate is carried out division arithmetic, obtain corresponding remainder, and remainder is added up; The code of code after adding up and setting is carried out XOR, obtain check code.
The process that 200 decodings of second terminal obtain first code is corresponding with the process that generates check code.
Be applied to the terminal of above-mentioned data transmission system, as shown in Figure 3, comprising: generation unit 310, assembled unit 320, and transmitting element 330.Wherein,
Transmitting element 330 is used for sending heartbeat packet through Controller Area Network BUS technology CAN-Bus.
The mode that generation unit 310 generates check code is various; Wherein, can specifically be used to generate a random code, and when said random code non-zero; And the random code during with last transfer of data is not simultaneously; According to said data message waiting for transmission, and random code is carried out cryptographic calculation, the generation check code.
Preferably, generation unit 310 specifically is used for obtaining to set code; When the highest order of setting code is 0; Code with data message waiting for transmission and random code and setting carries out division arithmetic respectively, obtains corresponding remainder, and remainder is added up; The code of code after adding up and setting is carried out XOR, obtain check code; When the highest order of setting code is 1; After the whole negate of the code of setting; Respectively the code after data message waiting for transmission and random code and the negate is carried out division arithmetic, obtain corresponding remainder, and remainder is added up; The code of code after adding up and setting is carried out XOR, obtain check code.
Terminal in the data transmission system promptly can be used as transmitting terminal, also can be used as receiving terminal, and therefore, this terminal also comprises:
Receiving element is used for receiving heartbeat packet through CAN-Bus.
Decoding unit is used for the heartbeat packet that receives is decoded.
Processing unit is used for when first check code that decodes is consistent with the check code of the heartbeat packet that receives, from heartbeat packet, obtains data message waiting for transmission and carrying out information processing.
Wherein, decoding unit specifically is used for identifying random number according to the order of setting respectively from said heartbeat packet, and data message waiting for transmission and effect sign indicating number carry out computing with data message said waiting for transmission that identifies and random number, obtain first check code.
In the embodiment of the invention; In the CAN-Bus communication, utilize random number and data message waiting for transmission to carry out the encryption of heartbeat packet, improved the difficulty that cracks; And; Data message waiting for transmission is blended in the heartbeat packet to encrypt together sends, the fail safe that has improved these data messages has also improved the use value of heartbeat packet.
In addition, also can adopt dynamic generation, non-zero and different random code during with last transfer of data, guarantee the inequality of each check code, further improved the reliability that heartbeat packet is encrypted.
And in the process that the generation check code is encrypted, all adopting is byte or nibble computing, has improved the speed of bulk encryption.Equally, decoding obtains in the process of first check code, owing to be the decrypt operation corresponding with cryptographic calculation, like this, also improves the speed of decoding.Thereby, improved speed of data communication.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. the method for a transfer of data is characterized in that, comprising:
First terminal generates check code according to random code and data message waiting for transmission;
Said random code, said data message waiting for transmission and said check code are formed heartbeat packet by the sequential combination of setting; And send to second terminal through Controller Area Network BUS technology CAN-Bus; The said heartbeat packet that makes said second end-on receive is decoded; And when first check code that decodes is consistent with the check code in the heartbeat packet that receives, from said heartbeat packet, obtains said data message waiting for transmission and carry out information processing.
2. the method for claim 1 is characterized in that, said first terminal comprises according to code of setting and data message waiting for transmission generation check code:
Said first terminal generates a random code;
When said random code non-zero, and the random code during with last transfer of data is not simultaneously, and according to said data message waiting for transmission, and said random code carries out cryptographic calculation, generates check code.
3. the method for claim 1 is characterized in that, the heartbeat packet that said second end-on is received is decoded and comprised:
Said second terminal is identified random number respectively from said heartbeat packet, data message waiting for transmission and effect sign indicating number according to the order of setting;
Data message said waiting for transmission that identifies and random number are carried out computing, obtain first check code.
4. the system of a transfer of data is characterized in that, comprising:
First terminal; Be used for generating check code according to random code and data message waiting for transmission; Said random code, said data message waiting for transmission and said check code are formed heartbeat packet by the sequential combination of setting, and send to second terminal through Controller Area Network BUS technology CAN-Bus;
Second terminal; Be used for receiving said heartbeat packet through CAN-Bus; Said heartbeat packet to receiving is decoded, and when first check code that decodes is consistent with the check code in the heartbeat packet that receives, from said heartbeat packet, obtains said data message waiting for transmission and carry out information processing.
5. system as claimed in claim 4 is characterized in that,
Said first terminal specifically is used to generate a random code, and when said random code non-zero, and the random code during with last transfer of data is not simultaneously, and according to said data message waiting for transmission, and said random code carries out cryptographic calculation, generates check code.
6. system as claimed in claim 4 is characterized in that,
Said second terminal specifically is used for identifying random number according to the order of setting respectively from said heartbeat packet, and data message waiting for transmission and effect sign indicating number carry out computing with data message said waiting for transmission that identifies and random number, obtain first check code.
7. the terminal of a transfer of data is characterized in that, comprising:
Generation unit is used for generating check code according to random code and data message waiting for transmission;
Assembled unit is used for said random code, said data message waiting for transmission and said check code are formed heartbeat packet by the sequential combination of setting;
Transmitting element is used for sending said heartbeat packet through Controller Area Network BUS technology CAN-Bus.
8. terminal as claimed in claim 7 is characterized in that,
Said generation unit specifically is used to generate a random code, and when said random code non-zero, and the random code during with last transfer of data is not simultaneously, and according to said data message waiting for transmission, and random code carries out cryptographic calculation, generates check code.
9. terminal as claimed in claim 7 is characterized in that, also comprises:
Receiving element is used for receiving heartbeat packet through CAN-Bus;
Decoding unit is used for the said heartbeat packet that receives is decoded;
Processing unit is used for when first check code that decodes is consistent with the check code of the heartbeat packet that receives, from said heartbeat packet, obtains said data message waiting for transmission and carrying out information processing.
10. terminal as claimed in claim 9 is characterized in that,
Said decoding unit specifically is used for identifying random number according to the order of setting respectively from said heartbeat packet, and data message waiting for transmission and effect sign indicating number carry out computing with data message said waiting for transmission that identifies and random number, obtain first check code.
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| CN116527439A (en) * | 2023-07-05 | 2023-08-01 | 广州疆海科技有限公司 | Data communication method, device, computer equipment and computer readable storage medium |
| CN116527439B (en) * | 2023-07-05 | 2023-10-17 | 广州疆海科技有限公司 | Data communication method, device, computer equipment and computer readable storage medium |
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