CN102394746A - Data transmission method of weighing system based on digital sensor - Google Patents
Data transmission method of weighing system based on digital sensor Download PDFInfo
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Abstract
The invention discloses a data transmission method of a weighing system based on a digital sensor to realize data transmission between the digital sensor and a host computer in the weighing system. The method comprises the following steps: encryption step: an encryption terminal generates a dynamic encryption key and a dynamic encryption algorithm according to a stored history encryption data packet, converts original data into a present time encryption data packet according to the dynamic encryption key, the dynamic encryption algorithm, a random encryption key and a fixed encryption algorithm, and transmits the present time encryption data packet to a decryption terminal; decryption step: according to the stored history encryption data packet, the decryption terminal generates a corresponding dynamic decryption secret key and a dynamic decryption algorithm, and converts the received present time encryption data packet into original data according to the dynamic decryption secret key, the dynamic decryption algorithm, a fixed decryption algorithm and a decryption secret key generated by the random encryption key. According to the invention, randomicity of selected secret key and encryption algorithm are high, and possibility of modifying data through replacement is stopped.
Description
Technical field
The present invention relates to a kind of data transmission method of electronic weighing system, relate in particular to a kind of data transmission method of the weighing system based on digital sensor.
Background technology
Along with the development of technology, electronic weighing system extensively applies to every field, the electronic weighing system of digital sensor generally by: scale body, digital sensor, host computer (weighing instrument etc.), terminal box etc. are formed.Because electronic scale is used as the instrument of trade settlement usually, it makes, uses the supervision that all need receive national technical supervision department, and the data communication of therefore weighing needs high safety.At present; The encrypted transmission of digital sensor mainly is to multiple key and AES (such as step-by-step XOR, DES, 3DES, AES, RSA scheduling algorithm) at present through fixing one; Transmit after communication data between host computer (weighing instrument etc.) and the digital sensor is transformed into encrypted packets, to improve safety of data transmission.
Yet this method has very big defective: is identical for same key with the encrypted packets that AES generates, and for the system of fixed key and password, the cribber can analyze replacement through collecting lot of data, reaches the purpose of cheating.Such as: digital sensor through encryption after: that 1 ton weight is sent is packet A; 1.1 the packet B that the weight of ton is sent.The cribber just can realize rewriting the purpose of weight, and needn't crack AES and key as long as when receiving packet A, it is rewritten into packet B.
Summary of the invention
The objective of the invention is to overcome the defective of prior art and a kind of data transmission method of the weighing system based on digital sensor is provided; This method is dynamically selected key and AES according to historical data; Key and AES randomness are very strong; Make that the each encrypted packets of sending of same data is all inequality, stopped to revise the possibility of data through replacement.
The technical scheme that realizes above-mentioned purpose is:
A kind of data transmission method of the weighing system based on digital sensor; Transfer of data in the realization weighing system between digital sensor and host computer; Said digital sensor is as encrypting end and host computer as decrypting end; Perhaps said host computer is as encrypting end and digital sensor as decrypting end, wherein
Said encryption end has n and organizes historical encrypted packets, and n is a positive integer; Said decrypting end has with the identical n of encryption end organizes historical encrypted packets;
Said data transmission method comprises the following steps:
Step S1; Encrypting step: said encryption end is according to the historical enciphered data packet generation dynamic encryption key and the dynamic encryption algorithm that have in it; And according to dynamic encryption key, dynamic encryption algorithm, random encryption key and fixed-encryption algorithm; Initial data is converted into this encrypted packets, and is transferred to said decrypting end;
Step S2; Decryption step: said decrypting end is according to historical enciphered data packet generation dynamic resolution decryption key that has in it and dynamic decipherment algorithm; And, this encrypted packets that receives is converted into initial data according to dynamic resolution decryption key, dynamically decipherment algorithm, fixing decipherment algorithm and by the decruption key of random encryption key generation.
The data transmission method of above-mentioned weighing system based on digital sensor, wherein, said step S1, promptly encrypting step specifically comprises the following steps:
A. Dynamic Selection encryption key and algorithm: said encryption end is dynamically selected dynamic encryption key and dynamic encryption algorithm according to the historical encrypted packets that has in it;
B. change initial data: initial data transforms through said dynamic encryption key and dynamic encryption algorithm, obtains the first intermediate cryptographic packet;
C. change intermediate data: the said first intermediate cryptographic packet produces the second intermediate cryptographic packet through the random encryption key of fixed-encryption algorithm and generation at random;
D. send packet: the said second intermediate cryptographic packet adds described this encrypted packets of random encryption key composition; Said encryption end is transferred to said decrypting end with this this encrypted packets, and this this encrypted packets is preserved as one group of new historical encrypted packets;
The data transmission method of above-mentioned weighing system based on digital sensor, wherein, said step S2, promptly decryption step specifically comprises the following steps:
A. Dynamic Selection decruption key and algorithm: said decrypting end is according to its historical encrypted packets that has, and dynamically selects dynamic resolution decryption key and dynamic decipherment algorithm;
B. receive packet: said decrypting end is preserved this encrypted packets that is received as one group of new historical encrypted packets, and obtains corresponding decruption key according to the random encryption key in this encrypted packets;
C. obtain intermediate data: said decrypting end transforms this encrypted packets according to said decruption key and fixing decipherment algorithm, decrypted data packet in the middle of obtaining;
D. obtain initial data: decrypted data packet transforms through said dynamic resolution decryption key and dynamic decipherment algorithm in the middle of said, obtains initial data.
The data transmission method of above-mentioned weighing system based on digital sensor, wherein, said encryption end is dynamically selected dynamic encryption algorithm and dynamic encryption key, and said decrypting end dynamically selects dynamic decipherment algorithm and dynamic resolution decryption key, specifically comprises:
Said encryption end through the step-by-step XOR, after the mode of the summation that perhaps adds up changes, is confirmed dynamic encryption algorithm through the mode of tabling look-up with its historical encrypted packets that has; Said decrypting end through the certain step-by-step XOR the same with encrypting end, after the mode of the summation that perhaps adds up changes, is confirmed dynamic decipherment algorithm through the mode of tabling look-up with its historical encrypted packets that has;
If the dynamic encryption algorithm of selecting is a kind of AES of symmetrical expression; The dynamic decipherment algorithm of then selecting also is a symmetrical expression; Said encryption end is then with the mode conversion of its historical encrypted packets that has through the step-by-step XOR; And regularization is carried out in the requirement of key according to selected dynamic encryption algorithm, confirm the dynamic encryption key; Said decrypting end is then with the mode conversion of its historical encrypted packets that has through the step-by-step XOR the same with encrypting end, and according to selected dynamic decipherment algorithm regularization carried out in the requirement of key, confirms the dynamic resolution decryption key;
If the dynamic encryption algorithm of selecting is a kind of asymmetric AES, the dynamic decipherment algorithm of then selecting also is an asymmetric, and then dynamic encryption key or dynamic resolution decryption key are all chosen through the mode of tabling look-up.
The data transmission method of above-mentioned weighing system based on digital sensor; Wherein, Said encryption end is all preserved an identical table with decrypting end, and the decipherment algorithm of some AESs and equivalent amount is arranged in this table, and the corresponding a kind of decipherment algorithm of each AES.
The data transmission method of above-mentioned weighing system based on digital sensor; Wherein, Said encryption end is all preserved an identical table with decrypting end, and the decruption key of some encryption keys and equivalent amount is arranged in this table, and the corresponding a kind of decruption key of each encryption key.
The invention has the beneficial effects as follows: the present invention dynamically selects key and AES according to historical data; Make that key and AES randomness are very strong; Even same data, each encrypted packets of sending is all inequality, thereby has stopped to revise through replacement the possibility of data.
Description of drawings
Fig. 1 is the schematic flow sheet of the data transmission method of the weighing system based on digital sensor of the present invention.
Embodiment
To combine accompanying drawing that the present invention is described further below.
See also Fig. 1, the data transmission method of the weighing system based on digital sensor of the present invention is realized the transfer of data between digital sensor and host computer in the weighing system; Said host computer can be weighing instrument or other; Said digital sensor is as encrypting end and host computer as decrypting end, and perhaps said host computer is as encrypting end and digital sensor as decrypting end, wherein; Said encryption end has n and organizes historical encrypted packets, and n is a positive integer; Said decrypting end has with the identical n of encryption end organizes historical encrypted packets;
Said data transmission method comprises the following steps:
Step S1; Encrypting step: said encryption end is according to the historical enciphered data packet generation dynamic encryption key and the dynamic encryption algorithm that have in it; And according to dynamic encryption key, dynamic encryption algorithm, random encryption key and fixed-encryption algorithm; Initial data is converted into this encrypted packets, and is transferred to said decrypting end;
Step S2; Decryption step: said decrypting end is according to historical enciphered data packet generation dynamic resolution decryption key that has in it and dynamic decipherment algorithm; And, this encrypted packets that receives is converted into initial data according to dynamic resolution decryption key, dynamically decipherment algorithm, fixing decipherment algorithm and by the decruption key of random encryption key generation.
Specifically, step S1, promptly encrypting step specifically comprises the following steps:
A. Dynamic Selection encryption key and algorithm: said encryption end is dynamically selected dynamic encryption key and dynamic encryption algorithm according to the historical encrypted packets that has in it;
B. change initial data: initial data transforms through said dynamic encryption key and dynamic encryption algorithm, obtains the first intermediate cryptographic packet;
C. change intermediate data: the said first intermediate cryptographic packet produces the second intermediate cryptographic packet through the random encryption key of fixed-encryption algorithm and generation at random;
D. send packet: the said second intermediate cryptographic packet adds described this encrypted packets of random encryption key composition; Said encryption end is transferred to said decrypting end with this this encrypted packets; And this this encrypted packets preserved as one group of new historical encrypted packets, encrypt end this moment and have n+1 and organize historical encrypted packets;
Specifically, step S2, promptly decryption step specifically comprises the following steps:
A. Dynamic Selection decruption key and algorithm: said decrypting end is according to its historical encrypted packets that has, and dynamically selects dynamic resolution decryption key and dynamic decipherment algorithm;
B. receive packet: said decrypting end is preserved this encrypted packets that is received as one group of new historical encrypted packets, and obtains corresponding decruption key according to the random encryption key in this encrypted packets;
C. obtain intermediate data: said decrypting end transforms this encrypted packets according to said decruption key and fixing decipherment algorithm, decrypted data packet in the middle of obtaining;
D. obtain initial data: decrypted data packet transforms through said dynamic resolution decryption key and dynamic decipherment algorithm in the middle of said, obtains initial data.
Encrypt end and dynamically select dynamic encryption key and dynamic encryption algorithm, and decrypting end dynamically selects dynamic resolution decryption key and dynamic decipherment algorithm, can adopt multiple mode, for example,
Dynamic Selection dynamic encryption algorithm, and the dynamic decipherment algorithm of Dynamic Selection:
Said encryption end is all preserved an identical table with decrypting end; 0 to m-1 m number is arranged in this table, and m is a positive integer, each the corresponding a kind of AES of number and a kind of decipherment algorithm; And this decipherment algorithm is corresponding with this AES; Then encrypt end and preserve m AES, decrypting end is preserved m decipherment algorithm
In each data transmission procedure; When encrypting the end encryption; Encrypt end with n organize historical encrypted packets through certain variation pattern (such as the step-by-step XOR, summation adds up) variation after; Get the mould of m then, thereby obtain one 0 number, confirm to use which kind of AES through the mode of tabling look-up then to m-1; During the decrypting end deciphering; Decrypting end with n organize historical encrypted packets through the certain variation pattern the same (such as the step-by-step XOR, summation adds up) variation with encrypting end after, get the mould of m then, obtain then 0 arrive m-1 number; Because the encryption end is all preserved identical n with decrypting end and is organized historical encrypted packets; So, 0 to m-1 the number that decrypting end obtains with encrypt the same that end obtains, so hold definite dynamic encryption algorithm corresponding each other with encrypting through definite dynamic decipherment algorithm of tabling look-up.
Dynamic Selection dynamic encryption key, and dynamically select the dynamic resolution decryption key:
If the dynamic encryption algorithm of above-mentioned selection is a kind of symmetrical expression (encryption key equals decruption key) AES; Encrypt end then with its historical encrypted packets that has through certain variation pattern (such as step-by-step XOR, CRC32) conversion after; After according to selected dynamic encryption algorithm regularization being carried out in the requirement of key again, confirm the dynamic encryption key; At this moment; Because the corresponding a kind of decipherment algorithm of a kind of AES; So the dynamic decipherment algorithm of above-mentioned selection also must be a kind of symmetrical expression (encryption key equals decruption key) decipherment algorithm; Decrypting end then with its historical encrypted packets that has through certain variation pattern (such as step-by-step XOR, the CRC32) conversion the same with encrypting end after, according to selected dynamic decipherment algorithm regularization is carried out in the requirement of key again after, confirm the dynamic resolution decryption key;
If the dynamic encryption algorithm of above-mentioned selection is asymmetric (encryption key is not equal to a decruption key) AES; At this moment; The dynamic decipherment algorithm of above-mentioned selection also must be asymmetric (encryption key is not equal to a decruption key) decipherment algorithm, and dynamic encryption key and dynamic resolution decryption key are then selected the acquisition of tabling look-up of the above-mentioned selection dynamic encryption algorithm and the dynamic mode of decipherment algorithm through being similar to.For example:
Said encryption end is all preserved an identical table with decrypting end; 0 to h-1 h number is arranged in this table, and h is a positive integer, each the corresponding a kind of encryption key of number and a kind of decruption key; And this encryption key is corresponding with this decruption key; Then encrypt end and preserve h encryption key, decrypting end is preserved h decruption key
After encrypting end n being organized historical encrypted packets and changes through certain variation pattern (such as the step-by-step XOR, summation adds up), get the mould of h then, thereby obtain one 0 number, then which kind of encryption key of the definite use of mode through tabling look-up to h-1; During the decrypting end deciphering; Decrypting end with n organize historical encrypted packets through the certain variation pattern the same (such as the step-by-step XOR, summation adds up) variation with encrypting end after, get the mould of h then, obtain then 0 arrive h-1 number; Because the encryption end is all preserved identical n with decrypting end and is organized historical encrypted packets; So, 0 to h-1 the number that decrypting end obtains with encrypt the same that end obtains, so hold definite dynamic encryption key corresponding each other with encrypting through tabling look-up the dynamic resolution decryption key definite.
In sum; The present invention dynamically selects key and AES according to historical data, makes that key and AES randomness are very strong, even same data; Each encrypted packets of sending is all inequality; Thereby stopped to revise the possibility of data, improved safety of data transmission greatly, had suitable practicality through replacement.
Above embodiment only supplies to explain the present invention's usefulness; But not limitation of the present invention; The technical staff in relevant technologies field under the situation that does not break away from the spirit and scope of the present invention, can also make various conversion or modification; Therefore all technical schemes that are equal to also should belong to category of the present invention, should be limited each claim.
Claims (6)
1. data transmission method based on the weighing system of digital sensor; Transfer of data in the realization weighing system between digital sensor and host computer; Said digital sensor is as encrypting end and host computer as decrypting end; Perhaps said host computer is characterized in that as encrypting end and digital sensor as decrypting end
Said encryption end has n and organizes historical encrypted packets, and n is a positive integer; Said decrypting end has with the identical n of encryption end organizes historical encrypted packets;
Said data transmission method comprises the following steps:
Step S1; Encrypting step: said encryption end is according to the historical enciphered data packet generation dynamic encryption key and the dynamic encryption algorithm that have in it; And according to dynamic encryption key, dynamic encryption algorithm, random encryption key and fixed-encryption algorithm; Initial data is converted into this encrypted packets, and is transferred to said decrypting end;
Step S2; Decryption step: said decrypting end is according to historical enciphered data packet generation dynamic resolution decryption key that has in it and dynamic decipherment algorithm; And, this encrypted packets that receives is converted into initial data according to dynamic resolution decryption key, dynamically decipherment algorithm, fixing decipherment algorithm and by the decruption key of random encryption key generation.
2. the data transmission method of the weighing system based on digital sensor according to claim 1 is characterized in that, said step S1, and promptly encrypting step specifically comprises the following steps:
A. Dynamic Selection encryption key and algorithm: said encryption end is dynamically selected dynamic encryption key and dynamic encryption algorithm according to the historical encrypted packets that has in it;
B. change initial data: initial data transforms through said dynamic encryption key and dynamic encryption algorithm, obtains the first intermediate cryptographic packet;
C. change intermediate data: the said first intermediate cryptographic packet produces the second intermediate cryptographic packet through the random encryption key of fixed-encryption algorithm and generation at random;
D. send packet: the said second intermediate cryptographic packet adds described this encrypted packets of random encryption key composition; Said encryption end is transferred to said decrypting end with this this encrypted packets, and this this encrypted packets is preserved as one group of new historical encrypted packets.
3. the data transmission method of the weighing system based on digital sensor according to claim 2 is characterized in that, said step S2, and promptly decryption step specifically comprises the following steps:
A. Dynamic Selection decruption key and algorithm: said decrypting end is according to its historical encrypted packets that has, and dynamically selects dynamic resolution decryption key and dynamic decipherment algorithm;
B. receive packet: said decrypting end is preserved this encrypted packets that is received as one group of new historical encrypted packets, and obtains corresponding decruption key according to the random encryption key in this encrypted packets;
C. obtain intermediate data: said decrypting end transforms this encrypted packets according to said decruption key and fixing decipherment algorithm, decrypted data packet in the middle of obtaining;
D. obtain initial data: decrypted data packet transforms through said dynamic resolution decryption key and dynamic decipherment algorithm in the middle of said, obtains initial data.
4. the data transmission method of the weighing system based on digital sensor according to claim 3; It is characterized in that; Said encryption end is dynamically selected dynamic encryption algorithm and dynamic encryption key, and said decrypting end dynamically selects dynamic decipherment algorithm and dynamic resolution decryption key, specifically comprises:
Said encryption end through the step-by-step XOR, after the mode of the summation that perhaps adds up changes, is confirmed dynamic encryption algorithm through the mode of tabling look-up with its historical encrypted packets that has; Said decrypting end through the certain step-by-step XOR the same with encrypting end, after the mode of the summation that perhaps adds up changes, is confirmed dynamic decipherment algorithm through the mode of tabling look-up with its historical encrypted packets that has;
If the dynamic encryption algorithm of selecting is a kind of AES of symmetrical expression; The dynamic decipherment algorithm of then selecting also is a symmetrical expression; Said encryption end is then with the mode conversion of its historical encrypted packets that has through the step-by-step XOR; And regularization is carried out in the requirement of key according to selected dynamic encryption algorithm, confirm the dynamic encryption key; Said decrypting end is then with the mode conversion of its historical encrypted packets that has through the step-by-step XOR the same with encrypting end, and according to selected dynamic decipherment algorithm regularization carried out in the requirement of key, confirms the dynamic resolution decryption key;
If the dynamic encryption algorithm of selecting is a kind of asymmetric AES, the dynamic decipherment algorithm of then selecting also is an asymmetric, and then dynamic encryption key or dynamic resolution decryption key are all chosen through the mode of tabling look-up.
5. the data transmission method of the weighing system based on digital sensor according to claim 4; It is characterized in that; Said encryption end is all preserved an identical table with decrypting end; The decipherment algorithm that some AESs and equivalent amount are arranged in this table, and the corresponding a kind of decipherment algorithm of each AES.
6. the data transmission method of the weighing system based on digital sensor according to claim 4; It is characterized in that; Said encryption end is all preserved an identical table with decrypting end; The decruption key that some encryption keys and equivalent amount are arranged in this table, and the corresponding a kind of decruption key of each encryption key.
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| CN111818078A (en) * | 2020-07-21 | 2020-10-23 | 成都英孚克斯科技有限公司 | Weighing data safe transmission method and system based on environmental factors |
| CN114070605A (en) * | 2021-11-12 | 2022-02-18 | 南方电网海南数字电网研究院有限公司 | Master station downlink data security verification method |
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