CN102394746B - 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 is widely used in every field, the electronic weighing system of digital sensor generally by: scale body, digital sensor, host computer (weighing instrument etc.), terminal box etc. form.Because electronic scale is usually used to the instrument as trade settlement, it is manufactured, uses the supervision that all needs to be subject to national technical supervision department, so weighing data communication needs high safety.At present, the encrypted transmission of digital sensor is mainly to multiple key and cryptographic algorithm (such as step-by-step XOR, DES, 3DES, AES, RSA scheduling algorithm) at present by fixing one, after being transformed into encrypted packets, communication data between host computer (weighing instrument etc.) and digital sensor transmits, to improve the fail safe of transfer of data.
Yet this method has very large defect: the encrypted packets for same key and cryptographic algorithm generation is identical, and for the system of fixed key and password, cribber can replace by collecting a large amount of data analysis, reaches the object of cheating.Such as: digital sensor by encryption after: that the weight of 1 ton sends is packet A; The packet B that the weight of 1.1 tons sends.Cribber, as long as be rewritten into packet B when receiving packet A, just can realize the object of rewriting weight, and needn't crack cryptographic algorithm and key.
Summary of the invention
The data transmission method that the object of the invention is to overcome the defect of prior art and a kind of weighing system based on digital sensor is provided, the method is dynamically selected key and cryptographic algorithm according to historical data, key and cryptographic algorithm randomness are very strong, make the each encrypted packets sending of same data not identical, stopped to come by replacement the possibility of Update Table.
The technical scheme that realizes above-mentioned purpose is:
A kind of data transmission method of the weighing system based on digital sensor, realize the transfer of data between digital sensor and host computer in weighing system, described digital sensor is as encrypting end and host computer as decrypting end, or described host computer is as encrypting end and digital sensor as decrypting end, wherein
Described encryption end has n and organizes historical encrypted packets, and n is positive integer; Described decrypting end has the n identical with encrypting end and organizes historical encrypted packets;
Described data transmission method comprises the following steps:
Step S1, encrypting step: described 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 described decrypting end;
Step S2, decryption step: described decrypting end is according to the historical enciphered data packet generation dynamic resolution decryption key having in it and dynamic decipherment algorithm, and according to dynamic resolution decryption key, dynamically decipherment algorithm, fixedly decipherment algorithm and the decruption key that produced by random encryption key, this encrypted packets receiving is converted into initial data.
The data transmission method of the above-mentioned weighing system based on digital sensor, wherein, described step S1, encrypting step, specifically comprises the following steps:
A. Dynamic Selection encryption key and algorithm: described encryption end, according to the historical encrypted packets having in it, is dynamically selected dynamic encryption key and dynamic encryption algorithm;
B. change initial data: initial data transforms by described dynamic encryption key and dynamic encryption algorithm, obtain the first intermediate cryptographic packet;
C. change intermediate data: described the first intermediate cryptographic packet produces the second intermediate cryptographic packet by fixed-encryption algorithm and the random random encryption key producing;
D. send packet: the random encryption key that described the second intermediate cryptographic packet adds the above forms this encrypted packets, described encryption end is transferred to described decrypting end by this this encrypted packets, and this this encrypted packets is preserved as one group of new historical encrypted packets;
The data transmission method of the above-mentioned weighing system based on digital sensor, wherein, described step S2, decryption step, specifically comprises the following steps:
A. Dynamic Selection decruption key and algorithm: the historical encrypted packets that described decrypting end has according to it, dynamically select dynamic resolution decryption key and dynamic decipherment algorithm;
B. receive packet: described decrypting end is preserved this received encrypted packets 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: described decrypting end, according to described decruption key and fixing decipherment algorithm, transforms this encrypted packets, decrypted data packet in the middle of obtaining;
D. obtain initial data: in the middle of described, decrypted data packet transforms by described dynamic resolution decryption key and dynamic decipherment algorithm, obtains initial data.
The data transmission method of the above-mentioned weighing system based on digital sensor, wherein, described encryption end is dynamically selected dynamic encryption algorithm and dynamic encryption key, and described decrypting end dynamically selects dynamic decipherment algorithm and dynamic resolution decryption key, specifically comprises:
The historical encrypted packets that described encryption end is had is by step-by-step XOR, or after the mode of cumulative summation changes, by the mode of tabling look-up, determines dynamic encryption algorithm; The historical encrypted packets that described decrypting end is had is by the certain step-by-step XOR the same with encrypting end, or after cumulative mode of suing for peace changes, by the mode of tabling look-up, determines dynamic decipherment algorithm;
If the dynamic encryption algorithm of selecting is a kind of cryptographic algorithm of symmetrical expression, the dynamic decipherment algorithm of selecting is also symmetrical expression, the historical encrypted packets that described encryption end is had is by the mode conversion of step-by-step XOR, and according to selected dynamic encryption algorithm, the requirement of key is carried out to regularization, determine dynamic encryption key; The historical encrypted packets that described decrypting end is had is by the mode conversion of the step-by-step XOR the same with encrypting end, and according to selected dynamic decipherment algorithm, the requirement of key carried out to regularization, determines dynamic resolution decryption key;
If the dynamic encryption algorithm of selecting is a kind of asymmetric cryptographic algorithm, the dynamic decipherment algorithm of selecting is also asymmetric, and dynamic encryption key or dynamic resolution decryption key are all chosen by the mode of tabling look-up.
The data transmission method of the above-mentioned weighing system based on digital sensor, wherein, described encryption end and decrypting end are all preserved an identical table, have the decipherment algorithm of some cryptographic algorithm and equivalent amount in this table, and the corresponding a kind of decipherment algorithm of each cryptographic algorithm.
The data transmission method of the above-mentioned weighing system based on digital sensor, wherein, described encryption end and decrypting end are all preserved an identical table, have the decruption key of some encryption keys and equivalent amount 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 cryptographic algorithm according to historical data, make key and cryptographic algorithm randomness very strong, even same data, each encrypted packets sending is not identical, thereby has stopped to come by replacement the possibility of Update Table.
Accompanying drawing explanation
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
Below in conjunction with accompanying drawing, the invention will be further described.
Refer to Fig. 1, the data transmission method of the weighing system based on digital sensor of the present invention, realize the transfer of data between digital sensor and host computer in weighing system, described host computer can be weighing instrument or other, described digital sensor is as encrypting end and host computer as decrypting end, or described host computer is as encrypting end and digital sensor as decrypting end, wherein, described encryption end has n and organizes historical encrypted packets, and n is positive integer; Described decrypting end has the n identical with encrypting end and organizes historical encrypted packets;
Described data transmission method comprises the following steps:
Step S1, encrypting step: described 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 described decrypting end;
Step S2, decryption step: described decrypting end is according to the historical enciphered data packet generation dynamic resolution decryption key having in it and dynamic decipherment algorithm, and according to dynamic resolution decryption key, dynamically decipherment algorithm, fixedly decipherment algorithm and the decruption key that produced by random encryption key, this encrypted packets receiving is converted into initial data.
Specifically, step S1, encrypting step, specifically comprises the following steps:
A. Dynamic Selection encryption key and algorithm: described encryption end, according to the historical encrypted packets having in it, is dynamically selected dynamic encryption key and dynamic encryption algorithm;
B. change initial data: initial data transforms by described dynamic encryption key and dynamic encryption algorithm, obtain the first intermediate cryptographic packet;
C. change intermediate data: described the first intermediate cryptographic packet produces the second intermediate cryptographic packet by fixed-encryption algorithm and the random random encryption key producing;
D. send packet: the random encryption key that described the second intermediate cryptographic packet adds the above forms this encrypted packets, described encryption end is transferred to described decrypting end by this this encrypted packets, and this this encrypted packets is preserved as one group of new historical encrypted packets, now encrypt end and have n+1 and organize historical encrypted packets;
Specifically, step S2, decryption step, specifically comprises the following steps:
A. Dynamic Selection decruption key and algorithm: the historical encrypted packets that described decrypting end has according to it, dynamically select dynamic resolution decryption key and dynamic decipherment algorithm;
B. receive packet: described decrypting end is preserved this received encrypted packets 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: described decrypting end, according to described decruption key and fixing decipherment algorithm, transforms this encrypted packets, decrypted data packet in the middle of obtaining;
D. obtain initial data: in the middle of described, decrypted data packet transforms by described dynamic resolution decryption key and dynamic decipherment algorithm, 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 various ways, for example,
Dynamic Selection dynamic encryption algorithm, and the dynamic decipherment algorithm of Dynamic Selection:
Described encryption end and decrypting end are all preserved an identical table, in this table, there is 0 to m-1 m number, m is positive integer, the corresponding a kind of cryptographic algorithm of every number and a kind of decipherment algorithm, and this decipherment algorithm and this cryptographic algorithm are corresponding, encrypt end and preserve m cryptographic algorithm, decrypting end is preserved m decipherment algorithm
In each data transmission procedure, while encrypting end encryption, encrypt end by n organize historical encrypted packets by certain variation pattern (such as step-by-step XOR, cumulative summation) variation after, then get the mould of m, thereby obtain one 0 to the number of m-1, then by the mode of tabling look-up, determine and use which kind of cryptographic algorithm; During decrypting end deciphering, decrypting end is organized historical encrypted packets by after holding the same certain variation pattern (such as step-by-step XOR, cumulative summation) to change with encryption by n, then get the mould of m, then obtain 0 to m-1 number, because encryption end and decrypting end are all preserved identical n and are 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 mutually corresponding by table look-up definite dynamic decipherment algorithm and encryption.
Dynamic Selection dynamic encryption key, and dynamically select dynamic resolution decryption key:
If the dynamic encryption algorithm of above-mentioned selection is a kind of symmetrical expression (encryption key equals decruption key) cryptographic algorithm, after the historical encrypted packets that encryption end is had converts by certain variation pattern (such as step-by-step XOR, CRC32), according to selected dynamic encryption algorithm, the requirement of key is carried out, after regularization, determining dynamic encryption key again; Now, because the corresponding a kind of decipherment algorithm of a kind of cryptographic algorithm, so the dynamic decipherment algorithm of above-mentioned selection must be also a kind of symmetrical expression (encryption key equals decruption key) decipherment algorithm, after the historical encrypted packets that decrypting end is had converts by certain variation pattern (such as step-by-step XOR, CRC32) the same with encrypting end, according to selected dynamic decipherment algorithm, the requirement of key is carried out, after regularization, determining dynamic resolution decryption key again;
If the dynamic encryption algorithm of above-mentioned selection is asymmetric (encryption key is not equal to decruption key) cryptographic algorithm, now, the dynamic decipherment algorithm of above-mentioned selection must be also asymmetric (encryption key is not equal to decruption key) decipherment algorithm, and dynamic encryption key and dynamic resolution decryption key are selected above-mentioned selection dynamic encryption algorithm and the dynamically mode of the decipherment algorithm acquisition of tabling look-up by being similar to.For example:
Described encryption end and decrypting end are all preserved an identical table, in this table, there is 0 to h-1 h number, h is positive integer, the corresponding a kind of encryption key of every number and a kind of decruption key, and this encryption key is corresponding with this decruption key, encrypt end and preserve h encryption key, decrypting end is preserved h decruption key
After encrypting end n being organized to historical encrypted packets and changes by certain variation pattern (such as step-by-step XOR, cumulative summation), then get the mould of h, thereby obtain one 0 to the number of h-1, then by the mode of tabling look-up, determine which kind of encryption key of use; During decrypting end deciphering, decrypting end is organized historical encrypted packets by after holding the same certain variation pattern (such as step-by-step XOR, cumulative summation) to change with encryption by n, then get the mould of h, then obtain 0 to h-1 number, because encryption end and decrypting end are all preserved identical n and are 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 mutually corresponding by the dynamic resolution decryption key of tabling look-up definite with encryption.
In sum, the present invention dynamically selects key and cryptographic algorithm according to historical data, make key and cryptographic algorithm randomness very strong, even same data, each encrypted packets sending is not identical, thereby the possibility of having stopped to come by replacement Update Table, the fail safe that has greatly improved transfer of data, has suitable practicality.
Above embodiment is used for illustrative purposes only, but not limitation of the present invention, person skilled in the relevant technique, without departing 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 by each claim.
Claims (5)
1. the data transmission method of the weighing system based on digital sensor, realize the transfer of data between digital sensor and host computer in weighing system, described digital sensor is as encrypting end and host computer as decrypting end, or described host computer is as encrypting end and digital sensor as decrypting end, it is characterized in that
Described encryption end has n and organizes historical encrypted packets, and n is positive integer; Described decrypting end has the n identical with encrypting end and organizes historical encrypted packets;
Described data transmission method comprises the following steps:
Step S1, encrypting step: described 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 described decrypting end;
Step S2, decryption step: described decrypting end is according to the historical enciphered data packet generation dynamic resolution decryption key having in it and dynamic decipherment algorithm, and according to dynamic resolution decryption key, dynamically decipherment algorithm, fixedly decipherment algorithm and the decruption key that produced by random encryption key, this encrypted packets receiving is converted into initial data
Described step S1, encrypting step, specifically comprises the following steps:
A. Dynamic Selection encryption key and algorithm: described encryption end, according to the historical encrypted packets having in it, is dynamically selected dynamic encryption key and dynamic encryption algorithm;
B. change initial data: initial data transforms by described dynamic encryption key and dynamic encryption algorithm, obtain the first intermediate cryptographic packet;
C. change intermediate data: described the first intermediate cryptographic packet produces the second intermediate cryptographic packet by fixed-encryption algorithm and the random random encryption key producing;
D. send packet: the random encryption key that described the second intermediate cryptographic packet adds the above forms this encrypted packets, described encryption end is transferred to described decrypting end by this this encrypted packets, and this this encrypted packets is preserved as one group of new historical encrypted packets.
2. the data transmission method of the weighing system based on digital sensor according to claim 1, is characterized in that, described step S2, and decryption step, specifically comprises the following steps:
A. Dynamic Selection decruption key and algorithm: the historical encrypted packets that described decrypting end has according to it, dynamically select dynamic resolution decryption key and dynamic decipherment algorithm;
B. receive packet: described decrypting end is preserved this received encrypted packets 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: described decrypting end, according to described decruption key and fixing decipherment algorithm, transforms this encrypted packets, decrypted data packet in the middle of obtaining;
D. obtain initial data: in the middle of described, decrypted data packet transforms by described dynamic resolution decryption key and dynamic decipherment algorithm, obtains initial data.
3. the data transmission method of the weighing system based on digital sensor according to claim 2, it is characterized in that, described encryption end is dynamically selected dynamic encryption algorithm and dynamic encryption key, and described decrypting end dynamically selects dynamic decipherment algorithm and dynamic resolution decryption key, specifically comprises:
The historical encrypted packets that described encryption end is had is by step-by-step XOR, or after the mode of cumulative summation changes, by the mode of tabling look-up, determines dynamic encryption algorithm; The historical encrypted packets that described decrypting end is had is by the certain step-by-step XOR the same with encrypting end, or after cumulative mode of suing for peace changes, by the mode of tabling look-up, determines dynamic decipherment algorithm;
If the dynamic encryption algorithm of selecting is a kind of cryptographic algorithm of symmetrical expression, the dynamic decipherment algorithm of selecting is also symmetrical expression, the historical encrypted packets that described encryption end is had is by the mode conversion of step-by-step XOR, and according to selected dynamic encryption algorithm, the requirement of key is carried out to regularization, determine dynamic encryption key; The historical encrypted packets that described decrypting end is had is by the mode conversion of the step-by-step XOR the same with encrypting end, and according to selected dynamic decipherment algorithm, the requirement of key carried out to regularization, determines dynamic resolution decryption key;
If the dynamic encryption algorithm of selecting is a kind of asymmetric cryptographic algorithm, the dynamic decipherment algorithm of selecting is also asymmetric, and dynamic encryption key or dynamic resolution decryption key are all chosen by the mode of tabling look-up.
4. the data transmission method of the weighing system based on digital sensor according to claim 3, it is characterized in that, described encryption end and decrypting end are all preserved an identical table, in this table, there is the decipherment algorithm of some cryptographic algorithm and equivalent amount, and the corresponding a kind of decipherment algorithm of each cryptographic algorithm.
5. the data transmission method of the weighing system based on digital sensor according to claim 3, it is characterized in that, described encryption end and decrypting end are all preserved an identical table, in this table, there is the decruption key of some encryption keys and equivalent amount, and the corresponding a kind of decruption key of each encryption key.
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| CN102682506B (en) * | 2012-05-25 | 2015-07-08 | 北京华大信安科技有限公司 | Intelligent Bluetooth door access control method and device based on symmetric cryptographic technique |
| CN103561024A (en) * | 2013-10-31 | 2014-02-05 | 大连金马衡器有限公司 | Data transmission method based on weighing instrument and remote server |
| CN104270398A (en) * | 2014-10-28 | 2015-01-07 | 上海耀华称重系统有限公司 | Method for digital weighing system for preventing decoding data |
| CN105654698A (en) * | 2016-03-25 | 2016-06-08 | 浪潮通用软件有限公司 | Method for realizing remote centralized metering through serial server |
| CN111818078B (en) * | 2020-07-21 | 2022-06-24 | 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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| CN100431295C (en) * | 2002-11-26 | 2008-11-05 | 松下电器产业株式会社 | Method and device for data encipher/deciphering |
| KR100446336B1 (en) * | 2003-05-20 | 2004-09-01 | 엔에이치엔(주) | Method and Device of Data Encryption |
| JP2005045699A (en) * | 2003-07-25 | 2005-02-17 | Victor Co Of Japan Ltd | Digital information transmission system and digital information transmission method |
| DE10345457A1 (en) * | 2003-09-30 | 2005-04-28 | Infineon Technologies Ag | Data encrypting and decrypting device for protecting contents of e.g. smart card, against unauthorized reading, applies part of data to encryption input and part to decryption input |
| CN100581102C (en) * | 2007-05-31 | 2010-01-13 | 北京泛亚创知科技发展有限公司 | Data safety transmission method for wireless sensor network |
| CN100555350C (en) * | 2007-09-14 | 2009-10-28 | 梅特勒-托利多(常州)称重设备系统有限公司 | Weighing system communication method based on digital sensor |
| CN101783729A (en) * | 2009-01-15 | 2010-07-21 | 许丰 | Mini-tuner condition receiving system |
| CN101521880B (en) * | 2009-03-26 | 2011-04-27 | 中国计量学院 | Wireless real-time community medical care monitoring system with security mechanism and wireless real-time community medical care monitoring method |
| CN101968377B (en) * | 2010-09-15 | 2012-05-02 | 福州科迪电子技术有限公司 | Anti-cheating method of electronic scale |
| CN102185694A (en) * | 2010-12-21 | 2011-09-14 | 常熟理工学院 | Electronic file encrypting method and system based on fingerprint information |
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