TWI242347B - Encoding/decoding method of remote control for baud rate modulation and device thereof - Google Patents

Abstract

The invention relates to an encoding/decoding method of remote control for baud rate modulation and device thereof, in which the method employs baud rate modulation to encrypt the forwarding information. The encoding system comprises an encoder encoding an identification signal as a secret code, a translator that translates uncoded part and the secret code of the identification signal to a transmission signal. When the secret code is on the first level, the uncoded part of the corresponding identification signal of the secret code uses first baud rate to transmit and when the secret code is on the second level, the uncoded part of the corresponding identification signal of the secret code uses second baud rate to transmit. The decoder comprises a receiver receiving the transmission signal, a translator in connection with the receiver translating the transmission signal to a reception signal, an encoder generating a comparison code based on the coding rules of the encoder just like the transmitting side and a processor comparing the reception signal with the comparison code to control flow process.

Description

1242347 V. Description of the invention α) Field of the invention: The present invention relates to a method and device for wirelessly transmitting data encoding, especially an encoding method and device for encrypting data using logical algorithms. Background of the Invention: The remote control has become one of the frequently used items in daily life, and the application fields are quite wide, such as automobiles, home access control, audio-visual equipment, and home appliances. All of them use wireless remote control to improve the convenience of use. Although many remote control objects such as home appliances do not need to consider security issues such as preventing misuse and theft by others, in applications such as car remote controls and home access control, it is necessary to take the prevention of illegal intrusion and maintain security as the primary consideration. To avoid home or car theft. Even in order to prevent young children from watching inappropriate programs, audiovisual equipment needs to have some safe designs. Generally speaking, the remote control system can be divided into unidirectional operation and bidirectional operation. In a one-way operating system, the control signal is transmitted by the transmitting end to remotely control the equipment of the receiving end; while the control signal of the two-way operating system operates through the transmitting end and the receiving end to determine the purpose of control. Although two-way operating system can achieve mutual authentication and better control effect, it is rarely used except for some important occasions due to the complicated equipment and expensive equipment. The simplest remote control system is to send the control signal directly to the receiver wirelessly in plain text (p 1 a i n t e X t). If the clear text is the same each time, the intentional hacker drops the signal, because

Page 4 025G3: 1242347 V. Description of the invention (2) The data content is fixed. As long as the signal is replayed, the attack will be successful. The receiver will perform this action, so the system is extremely insecure. In life, there are occasions when you use your own remote control to open the door or car of other people's homes. These are things that users do not want to see.

Therefore, with the evolution of time and technology, there are gradually starting to use remote codes to transmit data by remote control. That is, when transmitting material, the remote control will be divided into two parts: clear code and password. The plain code is a universal code, and the structure of the contained data remains unchanged. The secret code uses the law of encryption to make it difficult for outsiders to obtain the meaning of their data. Although this method has high confidentiality and security, what can be seen at present is still complicated and the equipment cost is relatively high. Therefore, the inventor of the present case can store the clear code and the secret code in one signal at the same time by the same transmission method. For example, in the use of access control, it is only necessary to check the clear code at the gate of the community or the entrance of the common garage; but at the user's own door, the clear code and the secret code must be checked at the same time to confirm the identity, so at the application level, it can greatly Reducing the complexity and cost of the system can also allow the system to have its competitive advantage and more application areas in the market. Summary of the invention:

The main object of the present invention is to provide a device and method for wirelessly transmitting data encoding, particularly an encoding device and method for encrypting a part of data by using a logic circuit algorithm. A secondary object of the present invention is a simple, effective, and low-cost encoding device and method. The present invention uses the modulation of the baud rate to encrypt the transmitted data and hides it in

Page 5 1242347 V. Description of the invention (3) After sending the signal, the method steps are: a. Generate a secret code and a clear code using an identification signal; b. Use the secret code to control the transmission rate of the clear code: when the When the password is at the first level, the clear code corresponding to the password is transmitted at the first baud rate; when the password is at the second level, the clear code corresponding to the password is transmitted at the second baud rate. The encoding device of the present invention encrypts the transmitted data by means of Baud Rate Modulation. The device includes: an encoder that receives an identification signal and obtains a secret code after encoding a part of the identification signal; a compiler, Connect with the encoder to compile the uncoded part of the identification signal and the password obtained from the encoder into a transmission signal; where the compiler changes the unit waveform length of the uncoded part of the identification signal according to the following rules when compiling · (1) When the password is at the first level, the uncoded part of the identification signal corresponding to the password is transmitted at the first baud rate (2) When the password is at the second level, the password is corresponding The uncoded portion of the identification signal is transmitted at the second baud rate. The decoding device of the remote controller of the present invention includes: a receiver that receives a transmission signal; an interpreter that is connected to the receiver and uses a known baud rate to interpret the transmission signal into a reception signal; an encoder , Using a logic operation rule to generate a comparison code; and a processor, connected to the interpreter and the encoder, and receiving the received signal

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025GGG 1242347

The result is that the present invention is more secure than ordinary methods. Refer to FIG. 3, which is a block diagram of the encoder 5 of this embodiment. The user code 10 2 is most important in the encoder 15 to generate a secret code 5 0. The password 150 is passed through a password generator ι51. In addition to re-encoding the user code 102 using a mathematical mode, it is necessary to normalize the length of the password i50. The so-called length normalization refers to adjusting the length of the password 150 to be the same as the length of the password u. The length normalization action can be performed before or after encoding, or even in the encoding itself. For this embodiment, the length of the plain code 丨 丨 is the manufacturer's code of 100 octets plus the customer code of 10 16 digits and a total of 24 digits. Yuan, so it needs to be adjusted to 24 bits, in order to comply with the length of the plain code 11 to facilitate the operation of the compiler 16. The length normalization operation in this embodiment is completed before the password generator 1 51. The length of the high byte 1020 (high byte) and the low byte 1021 (10w byte) of the user code 1 are each After the eight bits enter the length normalizer 152, a four-bit transition code of 1520 is obtained. There are many ways for the length normalizer 152. In this embodiment, the upper byte 1 〇 2 of the user code and the lower byte i 〇 2 丨 are used to perform a mutually exclusive or Uxclusive OR (x〇R) operation to obtain the first Three bytes, and then combine these two bits into a one-to-four-bit transition code of 1520. After the transition code 1520 is obtained, the step of generating the secret code i50 is performed. There are many methods that can be used in the code generator 151, such as the polynomial method or the famous RS A method. This embodiment uses the previously generated code i 5 0 and the excessive code 15 20 to perform mutual exclusion or to obtain a new code 5. The benefits of using mutex or maximum are simplicity, low cost of hardware design, and coding

Page 8 025〇C8! 242347, --- ~ V. Description of the invention (7) At 100, it means logically "11 n. ^ The advantage of doing is to reduce the connection 0", no means "logically" 1". - so much time into electrical Ye do less recognizable wrong end 7, and only the present embodiment and variation defined within each bit pi ,, easy to calculate the reception terminal 7 bit length. The translator 16 does not operate; ^ Ma 1 5 〇 is "〇", the baud rate does not change, that is, the editing rate is halved, and when 30 2 Ma 1 50 is "丨", the compiler 16 will clear the code 1 The abalone code U of 1 is twice as long as ooi / o ^ # j. As shown in FIG. 4A, this is a wave signal waveform at the time of ⑽00,00,00 (also at the same time, when the code 150 is 150, 蚂 1). As shown in FIG. 4A, 'When the code 150 For 0101011, f, 4, 6, and 7 bits need to be doubled. T This is the flow chart of the transmitter 1 encoding: feP1: Press the button to generate the identification signal 10; tep 2. Check whether it is a reset Signal 154? If yes, execute Step56 '; if not, execute Step53; = encode the identification signal 10 to obtain a password I "; eP 4 · So, is the password 15 and the characteristic representing the reset signal? Is it the same? If yes, execute Step53, if not, execute SteP55; Step 5 5: the password 15 (μ 士人 ΜΜΊ, μ 成 a 兮, sent from the top and then Γ ^ input signal ^

Step 56: Set the secret code 15 to perform Step 55 on behalf of the reset signal 154; the value ′ η is as shown in FIG. 6, which is an architecture diagram of the receiver 6 in this embodiment. ". After receiving the transmission signal 18, the receiving end 6 needs to insert the signal back into the identification signal 10 to identify the identity and execute the command. Receiving end,,

Page ίο 〇25ϋ? 0 1242347 V. Description of the invention (8) Receiver 6 1. Interpretation, writing, sending and receiving. The receiver 6〗 receives the transmission wheel ;;: constituted by the encoder 65 and a processor 67, which is responsible for transmitting the transmission signal H 遽 18. The interpreter 63 is connected to the receiver 61 and the transmitter 1 encoder generates a received signal 68. The encoder 6 5 is like interpreting β 0, and the rule generates a comparison code 6 0. Process 5 | 6 7 Fresh ## 63 and the encoder 65 are connected to the process of receiving the slogan 6 8 and the code 5 | 6 5 & receive the receiving process generated by the solution # 63. When the second job = the comparison code 6 °, the two are compared and controlled; if: =: 0 and: the match code 60 is exactly the same, then the 4 bluff is executed, it is likely to be legal: there is something to send The wrong sending key made the transmitting end ^ ~ the official accidentally touched in other places? , But can't start ... Solve the problem :: The number of allowed errors 66 ', that is, when the comparison is not correct, receive = count the number of-times comparison code 6. Retry and receive signals: Receive = Automatic, execute the command ’if it does not match, and repeat the calculation of the next comparison. For example, if it meets: Confrontation: When the number of executions reaches 66, it will be terminated. There is a problem in that the user accidentally clicks, ..., many times, or after the receiving end 6 is attacked by an illegal user, the transmitting end 1 has been ahead of the legal user ’s password. The solution is to correct the problem. Code 6 〇 No. 15 4 resets the start code of the secret code 150 at the transmitting end 1 and the receiving end 6 to reset the initial state, so that both sides can synchronize and operate normally. 0 Back to the beginning Please refer to FIG. 7. This is a flowchart of the receiving end 6 of this embodiment.

Step70: Receive the transmission signal 18 and interpret it into a reception signal 6

Step71 ’Execute

Step71: Is the receiving signal 68 the reset signal? ^ The specificity of the present 154 page 11 025G71 1242347 V. Explanation of the invention (9) value? If yes, go to Step 72, if not, go to Step 74; ”, Gu receives the next transmission signal 18, executes St to record the password 150 data, and then pushes one '&60; executes Step 70; once compared to 3 S tep 7 4 ·· Whether the acceptance ## 6 8 is the same as the estimated μ, execute Step 75, if it is: execute the action represented by the transmission signal 18, J tep7 \ end, the number of errors = 0; order SteP76 TipU: The comparison code is 60. If the number of errors is small, is the execution equal to an allowable number of errors: 66? If it is Step76, if not, execute St g. SteP79: Does the acceptance signal 68 coincide with the result of the push, execute? Step75, if not, as described above, the present invention is a simple and effective method for encoding and decoding the method of paying for secret recipes, which can be used at a low cost. Too early because of the early: competitive value. Only use the products of the present invention in the market. ”Only the above is only a good example of the implementation of the present invention. Equal changes and inequalities without food: 卩 Dafan who applies for a patent in accordance with the present invention / From the spirit of the present invention and the essence of the month, there are also 7 conditions. The scope should therefore be a further negative of the present invention. S t ep 7 2 Step73

Step75 Step76 Step77 Step78: Execute the "code? If δ is not applied 1242347 The diagram is a brief explanation of the diagram: Fig. 1 is a diagram of the encoding structure of the transmitting end of this embodiment. Fig. 2 is the identification signal of this embodiment. Figure 3 is a block diagram of the encoding of this embodiment. Figures 4A and 4B are the compilation instructions of this embodiment. Figure 5 is the coding flowchart of the transmitting end. Figure 6 is the receiving end of this embodiment. Code structure diagram Figure 7 is the decoding flowchart of the receiving end. Figure No. Description: 1-Transmitting end 1 0-Identification signal 1 0 0 Gu: Commercial code 1 0 1-Customer code 1 0 2 _User code 1 0 2 0- User code high byte 1 0 2 1-User code low byte 1 1 _clear code 1 5-encoder 1 5 0-password 1 5 2 0-transition code 1 5 1-password generator 1 5 2-length Normalizer 1 5 3-Controller

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025G 1242347 Schematic description 154-Reset signal 1 6 -Compiler 1 8 -Transmit signal 5 1-5 6 -Transmitter encoding step 6 -Receiver 6 0 -Comparison code 6 1 -Receiver 6 3 -Solution Translator 6 5-Encoder 6 6-Number of allowable errors 6 7-Processor 6 8-Receive signal 7 0-7 9-Step of calculus at receiver

Claims (1)

6. Scope of patent application i · The encoding center of a remote control is generated using an identification signal. The "dark method" includes the following steps: b. Control the clear code with the secret code. When the level is in place, the transmission rate of the two codes is: When the secret code is the first delivery; when the secret "first" should be the Ming Ming Ming Chuan Ming code with the second interest: the level, then the dark horse corresponds to the 2. 1 'can be divided into-manufacturer code, and-Gu Shuke two methods, where the identification signal is the manufacturer's unified consideration: and-user code three parts; its code, the user π 编 edit, The customer code is the user group, where the manufacturer code and the step a include the party's customer code as described in item 2 of the scope of patent application. 3. The customer code is the clear code. The method described below, the following steps: / a 1 δ round the identification signal by making the transition g I b Μ the length of the code to obtain a transition code; then sum the horse length and the length of the clear code a the transition code and the previous Use the same time, a3 generates a password; the password used is the same as the encoding operation 5.!: Π: ί The method described in item 4, wherein the one is 6. When the method described in item 4 of the patent application is applied to perform the encoding operation once, the previous a is entered. Step a2 is No. 1242347 _ Case No. 9113254ll,… I amended_ VI. Patent Application Scope 7. A remote control encoding device that encrypts the transmitted data by means of baud rate modulation. The device includes: a code An encoder that receives an identification signal and obtains a password after encoding a part of the identification signal; a compiler connected to the encoder to compile the unencoded part of the identification signal and the password obtained by the encoder into a transmission Signal; the compiler changes the unit waveform length of the uncoded part of the identification signal according to the following rules when compiling ... (i) When the password is at the first level, the uncoded part of the identification signal corresponding to the password is transmitted at the first baud rate. (ii) When the password is at the second level, the password corresponds to the The uncoded portion of the identification signal is transmitted at the second baud rate. 8. The device according to item 7 of the scope of patent application, wherein the identification signal can be divided into three parts: a manufacturer code, a customer code, and a user code; wherein the manufacturer code is a uniform number of the manufacturer and the customer code Is a user group code, and the user code is an individual user code. 9. The device described in item 8 of the scope of patent application, wherein the manufacturer code and the customer code are clear codes. 10. The device according to item 7 of the scope of patent application, wherein the encoder comprises: a password generator that receives the identification signal and encrypts the identification signal with a logic circuit algorithm to generate a password; a length normalizer , Adjusting the identification signal to an appropriate length; and Page 16 1242347 x _Case No. 91132 Know_Year \ Month Day Amendment_ VI. Scope of Patent Application A controller is connected to the password generator and outputs a password or reset signal according to the situation. 1 1. The device as described in item 10 of the scope of patent application, wherein the password generator and the method for generating the password include the following steps: a. Adjusting the length of the user code of the identification signal to obtain a transition code; The length of the transition code is the same as the length of the plain code; b. The transition code performs a coding operation together with the previously used password to generate a password; c. The password is output. 12. The device as described in item 11 of the scope of patent application, wherein step b may be a mutually exclusive OR operation. 13. The device according to item 11 of the scope of patent application, wherein in step b, when the coding operation is performed for the first time, the previously used password input is a specific value set in advance. 1 4. A decoding device for a remote controller that can decode a transmission signal using a baud rate modulation method. The device includes: a receiver that receives a transmission signal; an interpreter that is connected to the receiver and uses a known A baud rate interprets the transmission signal into a reception signal; An encoder generates a comparison code by using a logic operation rule; and a processor is connected with the interpreter and the encoder, and compares the received signal with the comparison code to determine whether to accept the transmission signal. Take instructions and control the process. 15. The device according to item 14 of the scope of patent application, wherein the encoder Page 17 1242347 ΜΓ8: 1 ^ 『Year Month Day Repair (Rabbit) is replacing page Case No. 9113 ^ 54’, Yikou Ka ^ i Amendment_ VI. Patent Application Scope The encoding method shall be the same as the encoding method used to generate the transmission signal. 16. The device according to item 14 of the scope of patent application, wherein the processor has a fault-tolerant mechanism, which can automatically correct the asynchronism of the comparison code caused by the user accidentally touching the emission switch. 17. The device according to item 16 of the scope of patent application, wherein if the out-of-sync phenomenon exceeds the correction range of the fault-tolerant mechanism, the device can receive a reset signal to forcibly perform a synchronization action relative to the pair of codes. 1 8. A decoding device for a remote controller that can decode a transmission signal using the baud rate modulation method. The device includes: A receiver to receive a transmission signal; an encoder to generate a comparison code using a logic operation rule; a compiler connected to the encoder to compile the comparison code into a comparison signal using a known baud rate; and The processor is connected with the receiver and the compiler, compares the received signal with the comparison signal, decides whether to accept the instruction carried by the transmitted signal, and controls the flow. 19. The device described in item 18 of the scope of patent application, wherein the encoding method of the encoder should be the same as the encoding method of generating the transmission signal. 20. The device described in item 18 of the scope of patent application, wherein the processor has a fault-tolerant mechanism that can automatically correct the synchronization of the comparison code caused by the user accidentally touching the emission switch. 2 1. The device described in item 20 of the scope of patent application, wherein if the out-of-sync phenomenon exceeds the correction range of the fault-tolerant mechanism, the device can receive a reset signal to forcibly perform a synchronization action relative to the pair of codes. Page 18 1242347 15 User code 102 16-bit 1242347 Both year ... month exhale) is replacing the page