JPH03166898A - Remote controller - Google Patents

Abstract

PURPOSE:To make it impossible to analyze the system of constituent signals by processing a code signal with a hidden cryptographic function and sending the processed signal. CONSTITUTION:A transmission signal from a transmitter is received by a reception section 11, a received code signal is processed by a cryptographic function set to an arithmetic section 13 and the resulting processing signal is outputted. A signal comparison section 14 compares whether or not the calculated processing signal is coincident with the received processing signal. When the compared signal is coincident, a lock signal is generated from a lock signal generating means 15, stored in a storage section 16 and a succeeding area is released by an area setting means 17.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a remote control device used for opening and closing doors, garages, etc. of automobiles and homes.

(Prior art) Conventionally, a remote control device is used to open and close the door, and the door is opened and closed when the code signal sent from the transmitter matches the hood signal preset in the receiver. A new version has been developed.

(Problem to be solved by the invention) However, in such cases, is the same transmission? The code signal sent from J.n4 is always the same. It is distinguished from other remote control devices only by the difference in the code signal l1.

Therefore, by inserting the remote control device J of the same scale into Pu Kei's hand and analyzing the code signal, it is possible to determine the nature of the code signal composed of the captured remote control device. {There was a risk that only 1 would be analyzed. For example, the number of digits of a code signal can be easily analyzed.

The present invention has been made in view of the above-mentioned problems, and by processing a food signal using a positive sign function and transmitting the processed signal, even if the processed signal is analyzed, the The aim is to provide a remote control device whose mechanism cannot be analyzed.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides code signal generation means and conversion means for processing this code signal with a cryptographic function to generate a HLL processed signal. A transmitting device that transmits a signal, a receiving section that receives a processed signal transmitted from the transmitting device, a computing section that computes the received signal based on a positive sign function, and compares the computed signals. a comparator that determines whether the signal is a regular signal; and a lock device ii when the comparator determines that the signal is a regular signal.
' (a lock signal generating means for sending a signal to the receiver).

(Function) With the above configuration, the receiving device receives the processed signal sent from the transmitter, the calculation section calculates the received signal, and the comparison section compares the processed signal. However, when the signal is determined to be positive, the door can be opened and closed.

(Example) Next, an example of the present invention will be described in more detail with reference to the drawings.

1 to 4 are diagrams showing a first embodiment of the present invention, in which 1 is a transmitting device for an automobile, including a transmitting button 2, a code signal generating means 3, a converting means 4, a transmitting section 5, an incrementing means 6. The storage unit 7 is stored by κ1j1. The transmission button 2 is used to start the transmission device 1, and by operating the transmission button 2, the code signal N1 is transmitted from the code borrow generation means 3. The transmission base number i is incremented by 1 each time the send button is pressed by the incrementing means 6, and is incremented from i=l to i=2000, and when i=2000 is reached, i=l again. Return to That is, the code signal N, is N, to N,. . . When the code signal crosses N tono, it is incremented to N tono again. It is becoming more and more popular. Incidentally, although the transmission number i is incremented, the code value of the code signal N1 is transmitted at random 4LE. The converting means 4 processes the transmitted code signal 4j N + using a predetermined cryptographic function to generate a processed signal 4l. The transmitter 5 then transmits the recode signal N and the processed signal. A different function formula is set for the n(f function) depending on the car, and it is an associated function of the individual f.

Reference numeral 7 denotes a storage unit in which the transmitted code signal Ni is stored in RAM. Note that the information may be stored in a non-volatile memory instead of the RAM.

Reference numeral 10 denotes a receiving device installed in the automobile, which includes a receiving section 11, a receiving area 12, a calculating section 13, a signal comparing section 14, a lock signal generating means 15, a storage section 16, and an area setting stage 17. The receiving unit 1l receives the transmission signal from the transmitting device l, and the reception area l2 receives the code signal N. It is equipped with 2000 areas corresponding to the above, but among these, the area between 100 and 200 is usually released, and only the code {8N, number corresponding to this released area can be accepted. It is something to do. The received code signal N, is then processed using the cryptographic function set in the arithmetic unit l3, and a processed signal is output. The signal comparison unit l4 compares the calculated processed signal and the received processed signal to see if they match. If the values of the compared signals match, a lock signal is output from the lock signal generating means 15.

16 is the code signal N.16 of the signal when they match in the storage section. is memorized. I7 is an area setting means which selects the currently stored food signal N. from the area closed last time. The system closes the area up to the area corresponding to , and also releases 100 new areas when the remaining areas become 100 or less. That is, initially, areas 1 to 200 are secured, but when area 100 is closed, areas 201 to 300 are released, and when area 200 is closed, areas 301 to 400 are reserved. are released in sequence.

Then, when the area from 1900 to 1900 is closed, from 1 to 1 again.
The area up to 00 is released.

Next, the operation of the first embodiment will be explained based on FIGS. 3 and 4.

FIG. 3 is a flowchart showing the operation of the transmitting device 1. When the transmitting button 2 is operated in step S1, the transmitting device l
is activated in step S2 and starts to start. Then, in step S3, the code signal N stored in the storage section 7 is
Load 1 and step? This code signal N. It is determined whether the reference number of transmissions i is 1≧2000. When the basic number of transmissions is i<2000, the value of the standard number of transmissions i is incremented by one in step S5, and the raised standard number of transmissions;=;+1 is set as a new code signal N in step S7.
I,■1, and the outgoing IA quasi-number i
When the value of is 1≧2000, it is returned to i=l in step S6, and the code signal N1.1 corresponding to this value is stored in step S7. In step S8, the code signal N1
is processed using a cryptographic function, and the processed signal and code signal N. is transmitted from the transmitter 5 in step S9. In step SIO, it is determined whether the send button 2 is turned on, and if it is turned on, step SIO continues to be executed. When the send button 2 is turned off, the process proceeds to step Sll and ends.

FIG. 4 is a flowchart showing the operation of the receiving device 10.
When a power source such as an automobile battery is connected, the start is started in step S20, and in step S21 it is determined whether a signal has been input to the receiving section 11. When it is determined that a signal has been input, the start is started in step S22. It is determined whether the code signal N, is within the free region. If it is determined in step S22 that the area is within the release area, the process advances to step 323. Although not shown, the code values and the function formula of the Ill'i function of the transmitting device I and the receiving device 10 can be set to be the same in advance. In step S23, the received code signal N, is processed by the set cryptographic function, and in step S24
In step S25, it is determined whether the processed signal generated by the processing and the received processed signal match, and if they match, the value of the received code signal N1 is transferred to the received code signal N1 in step S25. Set as code signal NI. Then, in step 326, it is determined whether the door lock device is in the locked state or in the unlocked state, and if the door lock device Pt is in the locked state, the process proceeds to step S27, where an unlock signal is output, and the door lock device is unlocked. If the door lock device is in the unlocked state, the process advances to step 328 and a lock signal is issued to lock the door lock device.

Then, in step S29, the area setting means 17 closes the area up to the area corresponding to the code signal N, set in step S25, and closes the remaining area! 0
When the number becomes 0 or less, 100 new areas are released. After setting the area in step S29, step S107
The process proceeds to step S]07, where a count to be described later is cleared, and the process proceeds to step 3108, where the process ends.

On the other hand, if it is determined in step S22 that the input code signal NI is outside the release area, or if the input processed signal and the processed signal calculated by the receiving device 10 yen do not match, step S24 When it is judged that
Proceed to step SIOO, '? ! It is determined in step SIOI whether the count 1 of the warning count is 3 or more, and if it is within 3 [iiil, it is assumed that the signal was sent in error, and in step S102,
For example, a gentle female voice (iu) will warn you, ``This is not your car.'' Then, the process returns to step 321.

Similarly, if an incorrect signal is sent three times or more, it is determined that the person is trying to open the door locking device maliciously, and the process proceeds from step SIOI to step Sl03 to step S105, and the message "Thieves! Thief! Thief!"
After making a sound, the vehicle will flash its headlamps and sound the horn for 1 minute. Then, when one minute has elapsed, the alarm is stopped in step S106, the process proceeds to step St07, the above-mentioned warning count and timer count are cleared, and the process proceeds to step 3108 and ends. Note that if a normal signal is transmitted before the warning count reaches 3 times, steps S24 to S2
After proceeding to step 5 and executing up to step S29 as described above, the process proceeds to step S107, where the warning count and timer count are cleared and the process starts from step O.

According to this embodiment, once the code signal N1 is received, the same code signal N. Therefore, even if the transmission signal from the transmitting device I is copied, the door cannot be opened. Also, in the storage unit 7 of the transmitting device 1, the transmitted code signal N. is stored in RAM or unpressed memory, so when the transmitting device is not operating, almost no power is extinguished.Therefore, the power consumption is low, so it is easy to replace the kawaike. The frequency can also be reduced.

5 to 8 are diagrams showing a second embodiment of the present invention,
In the first embodiment, a unique cryptographic function is l for each car.
In the second embodiment, each car is equipped with a plurality of cryptographic functions.

In FIGS. 5 and 6, 5l is a transmitting device, which is equipped with a transmitting button 52, a code signal generating means 53, a converting means 54, a transmitting section 55, an incrementing means 56, and a storage section 57, and is similar to the first embodiment. They perform almost the same operation. In the first embodiment, the code signal 'j N +h<N 1 to N
,. . . This code signal NI was common to all automobiles.

On the other hand, in the second embodiment, in a certain automobile, the code signal N1 is set to N. From Nxa. Although it is up to N for other moving cars. 1 to N4. . Up to N4.1 to N for other cars. . Different cars now use different code signals. That is, it is provided with a code signal N1 unique to each individual. Further, a plurality of types of cryptographic functions are provided for the converting means 54, and the code signal N1 is processed to generate a processed signal while changing the cryptographic function. Similar to the first embodiment, this cryptographic function has a different functional formula set depending on the valley "1 motion 11t", and is a cryptographic function unique to each individual.In other words, in this embodiment, the code signal N , and the cryptographic function belong to each individual (a).

60 is a receiving device which includes a receiving section 61, a code comparing section 62, ha
t calculation section 63, signal comparison section 64, lock signal generation means 65
It is equipped with The receiving section 61 receives the transmission signal from the transmitting device 51, and the code comparison section 62 transmits the received code signal N, F! l. It is determined whether i is greater than or less than the set number of outgoing J&Qs (1). Transmission 1 for which the number of transmission base derivations of the received code signal N is set to 1.
(When the number of derivations is larger than i, the code signal N. is calculated using the cryptographic function currently set in the calculating section 63, and when it is smaller, it is calculated using the cryptographic function set next. There are multiple types of clear function.
The history is gradually changing. The signal comparison unit 64 compares the calculated processed signal and the received processed signal to see if they match. If the compared signals match, the lock signal generating means outputs a lock signal.

Next, the operation will be explained based on the seventh factor and FIG. 8.

FIG. 7 is a flowchart showing the operation of the transmitting device 5l.
When the send button 52 is operated in step S31, the sending device 51 is activated and starts in step S32. Then, in step S33, the code signal N, stored in the storage section 57 is read, and in step S34, the code signal N1 is transmitted! It is determined whether the value of the number of recitations i is i≧200. When the value of the transmission reference number i is i<200, the value of the transmission IA type number i is incremented by one in step 35, and the code signal N I++II11 corresponding to the raised transmission base number number i=i+1 is set to step S38. and a new code signal N. This code signal N, is stored in memory and sent to the conversion means 54. The modifier a54 processes this code signal N, using a cryptographic function in step S39, and transmits the processed signal and code signal N1 from the transmitter 5 in step S40. In step S41, it is determined whether the transmission button 52 is turned on, and if it is turned on, the process returns to step S40 to continue transmitting the signal. When the send button 52 is turned off, the process proceeds to step S42 and ends.

On the other hand, in step S34, the outgoing μ subfield number i is {'(is i=
If it becomes 200 (or if i>20 due to some factor)
0), the value of the number of transmission basic patterns is returned to i=] in step S36, and the functional formula of the cryptographic function is changed to the functional formula of the next step in step S37.

And step S? At step S3, the code signal N I corresponding to the number of outgoing calls i=l is stored in step S3.
Proceed to step 9.

FIG. 8 is a flowchart showing the operation of the receiving device 60.
``When a power source such as a battery for a motor vehicle is connected, the start is started in step S50, and in step S51, it is determined whether a signal is manually input to the receiving section 61 or not.
When it is determined that the signal has been manually inputted, the manually inputted code signal N. The number of transmissions i is compared with the reference number of transmissions i set in the receiving device IF/51. Normally, the reference number of transmissions 1 of the received code signal N, is the reference number of transmissions 1 set in the receiving device.
is the same as or larger than , and in this case step S5
Proceed to step 3. Although not shown, as in the first embodiment, it is possible to set the code values and cryptographic function expressions of the transmitting device 5l and the receiving device 60 to be the same in advance. In step S53, the received code signal N
1 is calculated by the function No. 7E currently set. In step S54, it is determined whether the processed signal generated by the calculation and the received processed signal match, and if they match, the received processed signal is The value of the code signal N. , code signal N in the receiving device 60 at S55.
．． Set as . Then, in step 356, it is determined whether the door lock device is in the locked state or in the unlocked state, and if the door lock device 111 is in the locked state, step S57
The process proceeds to step 358 to output an unlock signal and unlock the door ivy device, and if the door lock device is in the unlocked state, the process proceeds to step 358 to output a lock signal and lock the door ivy device. ing. Then, the process advances to step S107 and step S108 and ends.

On the other hand, in step S52, the input code signal 4V N
, the number i of the transmitting base 7vi is smaller than the number of transmitting bases 1 of the code signal NI set in the receiving device 60.
1! For i, the value of the transmission base type same number i of the food signal N of the transmission complaint 51 returns from i=200 to i=l, and 1:
Then, the process proceeds to step S60, where calculation is performed using the next I'fl'j function. By doing this, even if the transmitted signal is copied, the transmitted signal (
or a later transmitted signal) has been used even once, when the copied transmitted signal is received, it will be calculated using the later coordinating function, so the transmitted processed signal and the receiving device 60 The regions of the processed signals generated by calculation within the system never match. That is, step S52 and step S60 constitute a reception fil1 blocking means that prevents re-acceptance.

As a result of calculating the transmitted signal in step S60, if the transmitted processed signal and the processed signal calculated and generated in the receiving device match, the functional expression of the signal function of the transmitting device 5l is determined. is determined to have been changed to the next step, the process proceeds from step S61 to step S62, sets the new changed sign function, and proceeds to step S55.
At this time, the value of the code signal input manually is set. Then, the process proceeds from step S56 to step S57 or step S58, and the door lock device is unlocked or locked, and the process proceeds from step S107 to step 8108, where the process ends.

When it is determined that the processed signal transmitted in step S54 or step S61 and the processed signal calculated and emitted in the receiving device F60 do not match, step SIOO or step S108 is determined. Execute and end in the same manner as in the first embodiment.

Next, a description will be given of the third embodiment.

In the second embodiment, the food signal N1 is N. . The encryption function is changed when returning from N1 to N1.
In the third embodiment, the cryptographic function is changed when a predetermined value of a predetermined digit of the code signal occurs.

In this example, when the last two digits are 23, Illt
The function is made to change history.

Based on the flowcharts in Figures 9 and 10,
The operation of the embodiment will be explained.

Incidentally, in response to the actions of steps S34 to S37 in FIG. 7, the ninth prisoner performs the actions of S7] to S74,
Also, Figure 1O shows the Ste knobs S52 to S53 in Figure 8.
The operations in steps S60 to S62 are iJL, and the operations in steps S81 to S85 are performed, and the rest is the same as in the second embodiment, so only the step numbers will be described and the explanation will be omitted.

In FIG. 9, it is determined by the steering knob S71 whether the value of the last two digits of the code signal N of the code signal generating means 57 is 23. If the value is other than 23, the process proceeds to step S72 and the code signal is output. N. is changed to N l* 1, the process proceeds to step S38, and the following steps S39 to S342 are executed, and the process ends. On the other hand, the code signal N. If the value of the last two digits is 23, the process proceeds to step S73, where it is determined whether the number of transmissions has been 30 or more since the last time the cryptographic function was changed. And 30
If it is less than 30 times, the process advances to step S72, and if it is 30 times or more, the code function is changed in step S74, and the process advances to step S72. That is, the number of transmissions is 30.
The Ill'l function is not changed in subsequent cycles.

In FIG. 10, in step S51, the processed signal and the code signal N. When received, the step. The code signal Nl is calculated in the sub S8l to generate a processed signal. Then, in step S82, the received processed signal and the flu-calculated processed signal are compared, and if they match, the process proceeds to step S55, and the same operation as in the second embodiment is performed. If the signals do not match, the process proceeds to step S83, where the following calculation is performed using the n-th function to generate a processed signal. Then, the processed signal received in step S51 is compared with the processed signal generated by calculation using the next cryptographic function, and if the signals match, the signal function of the reception holder 60 is set to the next code function. and step S
5 Proceed to step 5. If the signals do not match in step S84, it is determined that an incorrect signal has been received, the process proceeds to step SIOO, and the same operation as in the second embodiment is performed.

In this embodiment, the 11rf function is changed when the code signal N, outputs a specific I, but the subsign function is changed by the signal {17]. You can. For example, when 1000>N, use the 8++1 function to calculate, and 200o>old≧1
When the value is 0 0 0, the calculation is performed using the block function of RO, and N. >2000, the calculation may be performed using the 111'l function of C.

(Effects of the Invention) As is clear from the above explanation, according to the present invention, a code signal is processed using a hidden cryptographic function and the processed processed signal is transmitted. No matter how much we analyze, there is no relationship between the processed signals, and we cannot analyze the structure of the signals.

[Brief explanation of the drawing]

FIG. 1 is a Bronok diagram of a transmitter according to a first embodiment of the present invention;
FIG. 2 is a block diagram of the receiver equipment according to the first embodiment of the present invention.
FIG. 3 is a flowchart of the transmitter according to the first embodiment of the present invention, FIG. 4 is a flowchart of the receiver according to the first embodiment of the present invention, and FIG. 5 is a flowchart of the transmitter according to the second embodiment of the present invention. FIG. 6 is a block diagram of the receiving device according to the second embodiment of the present invention, FIG. 7 is a flowchart of the transmitting device according to the second embodiment of the present invention, and FIG. FIG. 10 is a flowchart of the receiving device according to the third embodiment of the present invention, and FIG. 10 is a flowchart of the receiving device according to the third embodiment of the present invention. l・51... Transmission device, 2.52... Operation button,
3.53... Code signal generation means, 4.54... Conversion means, 5.55... Transmission section, 10.60... Receiving device, II.61... Receiving section, 13.63 . . . Arithmetic section, 1-64 . . . Lock signal generation section, 16. . . Storage section, 17. . . Area setting means.

Claims (3)

[Claims] (1) A transmitting device including a code signal generating means, a converting means for processing the code signal using a cryptographic function and generating a processed signal, and transmitting the processed signal; and a processed signal transmitted from the transmitting device. a receiving section that receives the received signal, a computing section that computes the received signal based on a cryptographic function, a comparing section that compares the computed signal to determine whether it is a legitimate signal, and this comparing section determines whether the signal is legitimate. 1. A remote control device comprising: a receiving device having a lock signal generating means for sending a signal to a lock device when determining that the signal is a signal from the lock device; (2) A remote control device characterized in that the code signal generated by the signal generating means according to claim 1 is a different code signal each time it is generated. (3) The transmitting device according to claim 1 transmits a code signal and a processed signal, the arithmetic unit of the receiving device processes the received code signal based on a cryptographic function, and the comparing unit processes the received code signal and the processed signal from the transmitting device. A remote control device characterized in that a processed signal processed by a receiving device is compared to see if they match.