CN107579824A - A kind of vehicle remote control method based on rolling code - Google Patents
A kind of vehicle remote control method based on rolling code Download PDFInfo
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- CN107579824A CN107579824A CN201710951235.2A CN201710951235A CN107579824A CN 107579824 A CN107579824 A CN 107579824A CN 201710951235 A CN201710951235 A CN 201710951235A CN 107579824 A CN107579824 A CN 107579824A
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Abstract
The present invention relates to a kind of vehicle remote control method based on rolling code.A kind of vehicle remote control method based on rolling code of the present invention does cryptographic calculation by transmitting terminal, updates synchronous code using synchronous code more new algorithm；Decryption computing is done by receiving terminal, judges to decrypt correctness, verifies remote control ID, perform function code, with transmitting terminal synchronized update synchronous code.Vehicle remote control method of the present invention based on rolling code has the advantages of improving automobile key theftproof performance.
Description
Technical field
The present invention relates to a kind of encrypting and decrypting method, more particularly to a kind of vehicle remote control method based on rolling code.
Background technology
At present there is obvious leak in automobile remote-control key, and it is numerous to be related to automobile brand.Most of automobile in the market
Wireless radio frequency remote control key is provided with, automobile can be performed and be locked, unlock, opening the door etc. and to order.The control of these automobile remote-control keys
Mode processed includes fixed code and rolling code.Fixed code mode refers to that same button is pressed every time, and automobile remote-control key sends same
The remote control coding scheme of the password of sample.It, which exists, cracks simply, and only need to intercept unlocking signal can invade automobile remote-control door lock system
The problem of system, the possibility for occurring to steal car are very big.
Rolling code mode refers to that same button is pressed every time, and the remote control that automobile remote-control key can all send different passwords is compiled
Code scheme.The rolling code remote control scheme of current trend is the Keeloq codings of Wei Xin companies of the U.S., other to also have some producers each
The single-chip microcomputer rolling code of self-programming, AES rolling codes, DES rolling codes etc., also RFID chip rolling code, these rolling codes are from original
Say it is similar in reason：All it is to use pseudo-random algorithm so that the rolling code that same button is sent every time has looked
Significant difference and do not contact significantly, and identical rolling code can only once effectively, and second is just invalid.Such as Fig. 1
In a manner of the shown coding encrypting to illustrate rolling code exemplified by Keeloq is encoded：The rolling code is by sequence number, synchronous code, feature
Code, function code are formed by Keeloq algorithm for encryption.The Serial No. transmitting terminal ID, there is uniqueness；The synchronous code pair
Should before rolling code, equivalent to the sequence number of rolling code；Described document information is to verify decryption after receiving terminal is decrypted
Correctness；The function code is the code for being used to indicate automobile action caused by corresponding button is pressed.When transmitting terminal detects button,
Function code is produced, rolling code corresponding with the synchronous code, and synchronous code are formed with Keeloq algorithm for encryption by key
Automatically plus it is stored in the lump in transmitting terminal internal storage, receiving terminal receives the information of rolling code, also updates receiving terminal EEPROM
Synchronous code value, ensure the consistent of synchronous code, smoothly decoded.
Rolling code improves theftproof performance to a certain extent, but is even generally considered safe AES encryption mode,
There is also certain stolen risk, because so-called rolling code is a kind of pseudo noise code in fact, often by one-touch, synchronous code
Counter adds one, is then encoded according to synchronous code.Have a disadvantage in that the simple change of synchronous code can in the presence of what is be cracked
Energy.And the algorithm and parameter of these coding chips are set by manufacturer is unified, once reveal, with a batch of remote-control key
It will all be decrypted, replicate.
The content of the invention
Based on this, it is an object of the present invention to provide:A kind of vehicle remote control method based on rolling code, it has enhancing
The confidentiality of rolling code, the advantages of being not easy to be cracked.
A kind of vehicle remote control method based on rolling code, comprises the following steps：
Transmitting terminal：
Step 001：When unlocking button is pressed, function code corresponding with unlocking button is produced in transmitting terminal；
Step 002：The sequence number of transmitting terminal, synchronous code, function code and condition code are arranged in order, composition plaintext A1；
Step 003：Using plaintext A1 caused by keelop algorithm for encryption steps 002, rolling code G1 is produced；
Step 004：Modulate simultaneously rolling code G1 caused by forwarding step 003；
Step 005：Synchronous code is updated using synchronous code more new algorithm, preparation is sent next time.
Receiving terminal：
Step 006：Simultaneously demodulated signal is received, obtains rolling code G2；
Step 007：Rolling code G2 is decrypted using the inverse operation of keelop algorithms, obtains plaintext A2；
Step 008：Extract plaintext A2 sequence numbers, synchronous code, function code and condition code；
Step 009：The condition code that comparison plaintext A2 condition code is locally stored with receiving terminal, if unanimously, plaintext A2 has
Effect；If inconsistent, plaintext A2 is invalid；
Step 010：The sequence number that plaintext A2 sequence number and receiving terminal are locally stored is compared, if unanimously, plaintext A2 has
Effect；If inconsistent, plaintext A2 is invalid；
Step 011：The synchronous code that comparison plaintext A2 synchronous code is locally stored with receiving terminal, judge both whether in step
It is under synchronous code more new algorithm in 005 and continuous within the limits prescribed；If continuous, perform function code.If discontinuous, no
Perform function code；
Step 012：The synchronous code received is updated and stored, prepares the comparison receive next time after.
Vehicle remote control method of the present invention based on rolling code, it using keelop algorithms before rolling code is produced
One-time pad encryption has been carried out to synchronous code, compared to the simple add one operation of the synchronous code of prior art, rolling code has been enhanced and is trapped
The difficulty of decoding, the security of rolling code is improved, and automobile is also can guarantee that in keelop algorithms and the parameter leakage of chip
The security of remote control.
Further, the more new algorithm of the synchronous code described in step 005 makees cryptographic calculation using a non-linear conversion table.It is logical
It is pseudorandom to cross the synchronous code for using a non-linear conversion table to make cryptographic calculation acquisition, increases the difficulty of decoding.
Further, the more new algorithm of the synchronous code described in step 005 makees cryptographic calculation using linear transformation.By using
The synchronous code that linear transformation makees cryptographic calculation acquisition is simple compared with non-linear conversion, improves arithmetic speed.
Further, the receiving terminal is provided with memory, and the memory preserves transmitting terminal remote control
Sequence number, condition code.Serial No. remote control ID is used to identify remote control corresponding to automobile, increases the difficulty of decoding；Condition code
To verify the correctness of decryption.
In order to more fully understand and implement, the invention will now be described in detail with reference to the accompanying drawings.
Brief description of the drawings
Fig. 1 is Keeloq coding encrypting schematic diagrames；
Fig. 2 is the vehicle remote control method encryption principle figure based on rolling code of the present invention；
Fig. 3 is the transmitting terminal flow chart of the vehicle remote control method based on rolling code of the present invention；
Fig. 4 is the receiving terminal flow chart of the vehicle remote control method based on rolling code of the present invention.
Embodiment
The present invention's is improved based on the vehicle remote control method of rolling code on the basis of traditional keelop algorithm codings
The counting mode of synchronous code, it is encrypted before with keelop algorithms generation rolling code, improves the safety of rolling code
Property.
Fig. 2 is referred to, it is the vehicle remote control method encryption principle figure based on rolling code of the invention.One has been sent every time
Individual synchronous code, the synchronous code of next rolling code is obtained as cryptographic calculation using synchronous code more new algorithm, the process of renewal is exactly
The renewal encryption of the process of encryption, i.e. algorithm instead of original plus a renewal, the synchronous code eliminated in decryption phase and decrypt again
Trouble.Then encryption synchronisation code turns into rolling code with condition code, function code and sequence number through keelop algorithm for encryption.It is decrypted
Journey is the inverse operation of ciphering process, and synchronous code is without decryption.
Fig. 3 is referred to, it is the transmitting terminal flow chart of the vehicle remote control method based on rolling code of the present invention.
It comprises the following steps：
1) key set code is generated：In the present invention, when user presses the button of automobile remote controllers, the instruction hair of automobile remote controllers
Raw device will produce corresponding function code；
2) generation plaintext：By the sequence number of transmitting terminal, synchronous code (last time has updated after sending), function code, condition code
Arrange in order, form plaintext A1, this is sequentially permanent order set in advance, receiving terminal is identified.Can also be according to need
Other orders are used, as long as transmitting terminal and receiving terminal carry out communication protocol；
3) keelop algorithm for encryption：Using plaintext A1 caused by keelop algorithm for encryption steps 002, rolling code G1 is produced；
4) data are sent：Modulated by the antenna of transmitting terminal and send rolling code G1；
5) synchronous code is updated：Complete send after, the synchronous code of transmitting terminal is no longer simple add one operation, but with transmission
The non-linear conversion table of end storage makees cryptographic calculation, and this cryptographic calculation is reversible, a new synchronous code is obtained, under being used for
One rolling code produces because using non-linear conversion table, caused synchronous code be it is pseudorandom, it is corresponding with synchronous code
Rolling code one layer of protection more than common rolling code, it is safer.Or the synchronous code of transmitting terminal more new algorithm uses
Linear transformation makees cryptographic calculation, is giving up to fall the consideration of a part of security, is improving arithmetic speed, is reducing energy consumption.
Fig. 4 is referred to, it is the receiving terminal flow chart of the vehicle remote control method based on rolling code of the present invention.
It comprises the following steps：
1) data are received：Receiving terminal is that automobile remote-control control system receives data by antenna；
2) keelop decipherment algorithms are decrypted：The data received are solved using the inverse operation of keelop AESs
It is close, obtain plaintext A2；
3) abstraction sequence number, synchronous code, function code, condition code：By corresponding to the extraction of the message format of transmitting terminal agreement
The sequence number of digit, synchronous code, function code, condition code；
4) condition code that comparison plaintext A2 condition code is locally stored with receiving terminal：Receiving terminal has been locally stored for verifying
The condition code of correctness is decrypted, is to send data for the first time in study stage i.e. transmitting terminal and receiving terminal to establish encrypting and decrypting mode
When be stored in receiving terminal memory.If both are consistent, illustrate that decryption is correct, then plaintext A2 is effective；If inconsistent, illustrate solution
Close incorrect, plaintext A2 is invalid, stops.
5) sequence number that plaintext A2 sequence number and receiving terminal are locally stored is compared：Receiving terminal has been locally stored for determining
The sequence number of remote control legitimacy, sequence number is uniquely corresponding with remote control, is transmitting terminal and receiving terminal also in the study stage
Send when data establish encrypting and decrypting mode and be stored in receiving terminal memory for the first time.If both are consistent, illustrate remote control
Legal, then plaintext A2 is effective；If inconsistent, illustrate that remote control is illegal, plaintext A2 is invalid, stops；
6) synchronous code that comparison plaintext A2 synchronous code is locally stored with receiving terminal, judge both whether in step 005
Synchronous code more new algorithm under and it is continuous within the limits prescribed；If continuous, perform function code.If discontinuous, do not perform
Function code.Under normal circumstances, because receiving terminal and transmitting terminal can all use same synchronization after once transmitting-receiving task is completed
Code more new algorithm renewal synchronous code, so the result for the synchronous code that comparison plaintext A2 synchronous code is locally stored with receiving terminal should
It is consistent.But that remote control can be by false touch be present, the synchronous code that may result in transmitting terminal have updated, and receiving terminal is same
It is constant to walk code, therefore allows receiving terminal to be carried out continuously more secondary synchronization codes and updates algorithm, is in the present embodiment 100 times,
The synchronous code obtained in 100 algorithms is consistent with plaintext A2 synchronous code, is recognized as continuous, receiving terminal perform function code, and more
New synchronous code；If inconsistent, receiving terminal not perform function code.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that come for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Scope.
Claims (4)
1. a kind of vehicle remote control method based on rolling code, comprises the following steps：
Transmitting terminal：
Step 001：When unlocking button is pressed, function code corresponding with unlocking button is produced in transmitting terminal；
Step 002：The sequence number of transmitting terminal, synchronous code, function code and condition code are arranged in order, composition plaintext A1；
Step 003：Using plaintext caused by keelop algorithm for encryption step 002, rolling code G1 is produced；
Step 004：Modulate simultaneously rolling code G1 caused by forwarding step 003；
Step 005：Synchronous code is updated using synchronous code more new algorithm, preparation is sent next time；
Receiving terminal：
Step 006：Simultaneously demodulated signal is received, obtains rolling code G2；
Step 007：Rolling code G2 is decrypted using the inverse operation of keelop algorithms, obtains plaintext A2；
Step 008：Extract plaintext A2 sequence numbers, synchronous code, function code and condition code；
Step 009：The condition code that comparison plaintext A2 condition code is locally stored with receiving terminal, if unanimously, plaintext A2 is effective；If
Inconsistent, plaintext A2 is invalid；
Step 010：The sequence number that plaintext A2 sequence number and receiving terminal are locally stored is compared, if unanimously, plaintext A2 is effective；If
Inconsistent, plaintext A2 is invalid；
Step 011：The synchronous code that comparison plaintext A2 synchronous code is locally stored with receiving terminal, judge both whether in step 005
In synchronous code more new algorithm under and it is continuous within the limits prescribed；If continuous, perform function code；If discontinuous, do not hold
Row function code；
Step 012：The synchronous code received is updated and stored, prepares the comparison receive next time after.
2. the vehicle remote control method according to claim 1 based on rolling code, it is characterised in that：Described in step 005
Synchronous code more new algorithm makees cryptographic calculation using a non-linear conversion table.
3. the vehicle remote control method according to claim 1 based on rolling code, it is characterised in that：Described in step 005
Synchronous code more new algorithm makees cryptographic calculation using linear transformation.
4. the vehicle remote control method according to claim 1 based on rolling code, it is characterised in that：In the transmitting terminal and connect
Receiving end is provided with memory, and the memory preserves sequence number, condition code and the synchronous code more new algorithm of transmitting terminal remote control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710951235.2A CN107579824B (en) | 2017-10-13 | 2017-10-13 | Automobile remote control method based on rolling code |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710951235.2A CN107579824B (en) | 2017-10-13 | 2017-10-13 | Automobile remote control method based on rolling code |
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| CN107579824A true CN107579824A (en) | 2018-01-12 |
| CN107579824B CN107579824B (en) | 2021-03-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108313008A (en) * | 2018-02-02 | 2018-07-24 | 辽宁科技大学 | Automobile burglar safety control system and its method |
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| CN1290802A (en) * | 2000-12-04 | 2001-04-11 | 三亚市实业贸易总公司 | Radio frequency remote control lock |
| US20090172279A1 (en) * | 2007-12-28 | 2009-07-02 | Po Yuan | System For Accessing A Removable Non-Volatile Memory Card |
| CN101662363A (en) * | 2008-08-30 | 2010-03-03 | 怀化学院 | Multi-layer rolling code encryption and decryption technology |
-
2017
- 2017-10-13 CN CN201710951235.2A patent/CN107579824B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1290802A (en) * | 2000-12-04 | 2001-04-11 | 三亚市实业贸易总公司 | Radio frequency remote control lock |
| US20090172279A1 (en) * | 2007-12-28 | 2009-07-02 | Po Yuan | System For Accessing A Removable Non-Volatile Memory Card |
| CN101662363A (en) * | 2008-08-30 | 2010-03-03 | 怀化学院 | Multi-layer rolling code encryption and decryption technology |
Non-Patent Citations (1)
| Title |
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| 代宇: "无线汽车门锁密码系统的研究与设计", 《中国优秀硕士学位论文全文数据库》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108313008A (en) * | 2018-02-02 | 2018-07-24 | 辽宁科技大学 | Automobile burglar safety control system and its method |
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Granted publication date: 20210312 Termination date: 20211013 |