CN104616374A - Car key remote control system radiofrequency signal interception method - Google Patents
Car key remote control system radiofrequency signal interception method Download PDFInfo
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- CN104616374A CN104616374A CN201410779050.4A CN201410779050A CN104616374A CN 104616374 A CN104616374 A CN 104616374A CN 201410779050 A CN201410779050 A CN 201410779050A CN 104616374 A CN104616374 A CN 104616374A
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Abstract
The invention discloses a car key remote control system radiofrequency signal interception method, a car key remote control system includes a key remote control unit and an in-car base station receiving unit; the key remote control unit sends coding sequence number to an in-car base station unit, and meanwhile sends a synchronisation counting value, and the in-car base station unit determines whether to perform key pressing operation or not respectively through detecting whether the coding sequence number and the synchronisation counting value are corresponding to a native machine. The super-high confidentiality rolling coding is used, information encoded content sent in each time is only, and coding is irregular and unrepeated, so that any illegal capture and scanning tracking and other decoding manner all fail to come true, and the key remote control system security is greatly improved.
Description
Technical field
The present invention relates to automobile door control technical field, particularly a kind of anti-method for interception of radiofrequency signal of automobile key telechirics.
Background technology
Along with the fast development of national economy, our people's living standard improves day by day, a lot of family has oneself automobile, after particularly China enters WTO, automotive industrial policy and credit financing policy will be progressively in line with international standards, Automobile Market will be more ripe, market outlook are boundless. and car races certainly will propose higher requirement to it, be mainly reflected in convenience, the aspect such as reliability and security. traditional automobile door control security product for one-way transmission mainly adopts regular coding integrated circuit, because the code length of this type of codec chip is limited, code shape form immobilizes, very easily cracked by the aerial method such as electric wave code word and scan tracing that catches, therefore, this type of codec chip level of security is lower.
Summary of the invention
Easily be blocked for above-mentioned existing car key remote the defect cracked, the present invention seeks to: the anti-method for interception of radiofrequency signal proposing a kind of automobile key telechirics, to solve the problem.
The technical solution adopted for the present invention to solve the technical problems is:
The anti-method for interception of radiofrequency signal of automobile key telechirics, described automobile key telechirics comprises key remote control unit and Che Nei base station unit; It is characterized in that, the anti-method for interception of described radiofrequency signal comprises the steps:
Step S1: after described key remote control unit detects key key-press input signal, wakes up described automobile key telechirics from power down mode;
Step S2: described key remote control unit comprises the first synchronous counter, the first scrambler, encryption equipment and transmitter, after described automobile key telechirics is waken up, described first synchronous counter generates a synchronous count value, described first scrambler generates a coded sequence number, described encryption equipment is encrypted together with described synchronometer numerical value and described coded sequence number, form an encrypt data, described encrypt data sends by described transmitter;
Step S3: in described car, base station unit comprises receiver, decipher, second scrambler, second synchronous counter and detecting device, after described receiver receives described encrypt data, by described decipher, described encrypt data is deciphered, thus obtain deciphering coded sequence number and deciphering synchronometer numerical value, then, described detecting device detects whether decipher the machine coded sequence that the deciphering coded sequence that obtains number and described second scrambler generate number corresponding, if corresponding, then detect again and decipher local synchronous count value that whether the deciphering synchronometer numerical value that obtains generate with described second synchronous counter in same synchronous window, if, then perform the key commands of described key remote control unit.
Described first synchronous counter is detecting that its synchronous numeration adds 1 automatically after described automobile key telechirics is waken up.
If described detecting device detects that described deciphering synchronometer numerical value and described local synchronous count value be not in same synchronous window, and described deciphering synchronometer numerical value is much larger than described local synchronous count value, then described second synchronous counter carries out a synchronous counting again.
Described coded sequence number is one 32 bit sequence number.
Described encryption equipment and described decipher adopt DES algorithm, aes algorithm or HITAG3 algorithm to be encrypted or to decipher.
Described synchronometer numerical value and described local synchronous count value are all 16.
The invention has the beneficial effects as follows: key telechirics of the present invention have employed advanced non-linear encryption technology, the rolling coding of high confidentiality can be produced, the information coding content sent each time is all unique, encode irregular and do not repeat, thus any decoding means such as illegal seizure and scan tracing of passing through all are vanished like soap bubbles, greatly improve the security of key telechirics.
Accompanying drawing explanation
Fig. 1 is present system structural drawing.
Fig. 2 is present system process flow diagram.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
What the present invention relates to is a kind of anti-method for interception of radiofrequency signal of automobile key telechirics, wherein Fig. 1 display is the system architecture of automobile key telechirics, specifically comprise key remote control unit and Che Nei base station unit two parts, communicated by radio frequency signal between these two unit.
Concretely, key remote control unit comprises the first synchronous counter, the first scrambler, encryption equipment and transmitter; In car, base station unit comprises receiver, decipher, detecting device, the second synchronous counter and the second scrambler.
Then, 2 the anti-method for interception of radiofrequency signal and principle in the present invention is explained by reference to the accompanying drawings.
First, after key remote control unit detects the input signal of key button, immediately key telechirics is waken up from battery saving mode;
After system is waken up, the first synchronous counter automatic synchronization numeration adds 1, generates the synchronometer numerical value of one 16; Meanwhile, the first scrambler generates the coded sequence number of one 32;
Encryption equipment utilizes DES algorithm, aes algorithm or HITAG3 algorithm by the synchronometer numerical value of above-mentioned generation and coded sequence number, encrypts together, generates an encrypt data, then sent by transmitter;
When the receiver in base station unit in car receives after this encrypt data, utilize DES algorithm, aes algorithm or HITAG3 algorithm to be deciphered by decipher, show that decoding synchronometer numerical value conciliates code sequence number;
After having decoded, whether whether first detecting device detects deciphering coded sequence number number corresponding, not corresponding with the machine coded sequence that the second scrambler generates, then system does not respond any operation, if corresponding, then continue detection and deciphers synchronometer numerical value;
When detecting that deciphering synchronometer numerical value is greater than the second synchronous counter and generates local synchronous count value, and difference in the first synchronous window time (wherein, the first synchronous window can be set as 256), the then key commands of system execution key;
When deciphering synchronometer numerical value and local synchronous count value be not at the same window, and deciphering synchronometer numerical value is much larger than (when the difference of deciphering synchronometer numerical value and local synchronous count value is greater than more than 32K) during local synchronous count value, then the second synchronous counter carries out one subsynchronous again, then repeats above-mentioned detection.
Because cryptographic algorithm can expressly breaing up, therefore, the rolling of code can make the code launched change widely different and be difficult to crack, and due to the existence of synchronous counting, repeating to send does not have effect yet, therefore will break through this type systematic and will break through HITAG3 algorithm.Synchronous counting is 16, can reach 2^16=65536, if with 10 times, then have the life cycle of 1812 every day.The sequence number of 32, capacity is 2^32=4,200,000,000, can meet production requirement completely.
Claims (6)
1. the anti-method for interception of the radiofrequency signal of automobile key telechirics, described automobile key telechirics comprises key remote control unit and Che Nei base station unit; It is characterized in that, the anti-method for interception of described radiofrequency signal comprises the steps:
Step S1: after described key remote control unit detects key key-press input signal, wakes up described automobile key telechirics from power down mode;
Step S2: described key remote control unit comprises the first synchronous counter, the first scrambler, encryption equipment and transmitter, after described automobile key telechirics is waken up, described first synchronous counter generates a synchronous count value, described first scrambler generates a coded sequence number, described encryption equipment is encrypted together with described synchronometer numerical value and described coded sequence number, form an encrypt data, described encrypt data sends by described transmitter;
Step S3: in described car, base station unit comprises receiver, decipher, second scrambler, second synchronous counter and detecting device, after described receiver receives described encrypt data, by described decipher, described encrypt data is deciphered, thus obtain deciphering coded sequence number and deciphering synchronometer numerical value, then, described detecting device detects whether decipher the machine coded sequence that the deciphering coded sequence that obtains number and described second scrambler generate number corresponding, if corresponding, then detect again and decipher local synchronous count value that whether the deciphering synchronometer numerical value that obtains generate with described second synchronous counter in same synchronous window, if, then perform the key commands of described key remote control unit.
2. the anti-method for interception of radiofrequency signal of a kind of automobile key telechirics as claimed in claim 1, is characterized in that, described first synchronous counter is detecting that its synchronous numeration adds 1 automatically after described automobile key telechirics is waken up.
3. the anti-method for interception of radiofrequency signal of a kind of automobile key telechirics as claimed in claim 1, it is characterized in that, if described detecting device detects that described deciphering synchronometer numerical value and described local synchronous count value be not in same synchronous window, and described deciphering synchronometer numerical value is much larger than described local synchronous count value, then described second synchronous counter carries out a synchronous counting again.
4. the anti-method for interception of radiofrequency signal of a kind of automobile key telechirics as claimed in claim 1, is characterized in that, described coded sequence number is one 32 bit sequence number.
5. the anti-method for interception of radiofrequency signal of a kind of automobile key telechirics as claimed in claim 1, is characterized in that, described encryption equipment and described decipher adopt DES algorithm, aes algorithm or HITAG3 algorithm to be encrypted or to decipher.
6. the anti-method for interception of radiofrequency signal of a kind of automobile key telechirics as claimed in claim 1, is characterized in that, described synchronometer numerical value and described local synchronous count value are all 16.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410779050.4A CN104616374A (en) | 2014-12-17 | 2014-12-17 | Car key remote control system radiofrequency signal interception method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410779050.4A CN104616374A (en) | 2014-12-17 | 2014-12-17 | Car key remote control system radiofrequency signal interception method |
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| CN104616374A true CN104616374A (en) | 2015-05-13 |
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| CN201410779050.4A Pending CN104616374A (en) | 2014-12-17 | 2014-12-17 | Car key remote control system radiofrequency signal interception method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107393277A (en) * | 2017-08-28 | 2017-11-24 | 江苏赫奕科技有限公司 | Method of sending and receiving based on low-power consumption safe mode des encryption rolling code |
| CN108111296A (en) * | 2017-12-15 | 2018-06-01 | 华中科技大学 | A kind of crack method and defence method of Hitag2 passwords |
| CN111968272A (en) * | 2020-08-25 | 2020-11-20 | 天津经纬恒润科技有限公司 | Data transmission method and device for remote control access control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111968272A (en) * | 2020-08-25 | 2020-11-20 | 天津经纬恒润科技有限公司 | Data transmission method and device for remote control access control system |
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Application publication date: 20150513 |