JPH07162950A - Radio telephony system - Google Patents

Abstract

PURPOSE:To provide the radio telephony system capable of lessening the risk of unauthorized use even when an ID code or an authentication code is plagiarized. CONSTITUTION:This system utilizes password codes stored in memories 19 and 25 for password codes of both a master set 18 and the slave set 24. At every time communication is requested from a slave set 24, an authentication code arbitrarily generated at an authentication code generating part 20 and transmitted is combined with the password codes at authentication an encoding circuit 26 of the slave set 24 received with the authentication code and subjected to a predermined encoding, thereby transmitting it to the master set as the authentication code. When it is decided that the received authentication code is correctly encoded based on the transmitted authentication code and the password code stored in the memory 19 for password code at a deciding circuit 22 of the base unit 18 and the slave set 24 can be confirmed, speaking is authorized to the slave set 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio telephone apparatus comprising a public base station or a base unit and a handset capable of communicating with the base unit or the base unit.

[0002]

2. Description of the Related Art In recent years, wireless telephone devices using wireless such as cordless telephones and car telephones have been remarkably developed, and the number of users is increasing.

A conventional radio telephone device will be described below with reference to the drawings. FIG. 17 is a block diagram showing the configuration of a conventional wireless telephone device. In FIG. 17, reference numeral 1 is a master unit, 2 is a radio unit for transmitting and receiving signals, and performing modulation and demodulation.
Is an audio processing unit that processes an audio signal including an expander, a compander, and a compressor, and 4 is a dial digit signal, an ID code, a control data such as a link establishment request from a slave, and a call signal of the slave. A data processing unit that performs generation, 5 is an ID code memory that stores the ID code of the slave unit that is permitted to talk with the master unit 1, 6 is a control unit that controls the master unit 1 as a whole, and 7 is an outside line An external line interface unit (external line I / F unit) for exchanging voice signals, incoming call signals, and the like.

Reference numeral 8 is a slave unit, 9 is a radio section for transmitting and receiving signals, and modulating and demodulating signals, 10 is a voice processing section for processing voice signals including an expander, compander, compressor and the like, and 11 is a dial digit signal. A data processing unit for processing control data such as a call channel designation signal from the base unit 1 and generating a call signal for the base unit 1, 12 is an ID code memory in which the ID code of the handset 8 is stored, Reference numeral 13 is a keypad for inputting a call request or dial information, 14 is a display unit for displaying the input dial information, and 15 is a microphone for inputting voice.
Reference numeral 6 is a speaker for outputting a voice, and 17 is a control unit for controlling the entire slave unit 8.

FIG. 18 is a diagram showing an example of a sequence of signal exchange when there is a call request from the handset 8 to the base unit 1. The operation of the cordless telephone configured as described above will be described. When making a call from the handset 8, the user first presses the call button provided on the keypad 13. When the control unit 17 detects that the call button is pressed, the control unit 17 outputs a control signal for causing the data processing unit 11 to generate a link establishment request. The data processing unit 11 generates a link establishment request signal according to the control signal and outputs the signal to the wireless unit 9, and the wireless unit 9 generates and outputs a wireless signal. On the other hand, the wireless unit 2 of the parent device 1 constantly scans the control channel, and when the wireless signal from the child device 8 is received, the demodulated signal is transmitted to the data processing unit 4. The data processing unit 4 analyzes the demodulated signal and outputs the information of the received control signal to the control unit 6. When the link establishment request is issued from the slave unit 8 as described above, the signal from the slave unit 8 is detected by the data processing unit 4 and transmitted to the control unit 6. When the control unit 6 is informed that the link establishment request has been received, it activates the sequence for link establishment, and
The data processing unit 4 is controlled so as to generate and output a request signal. In the data processing unit 4, I
The D request signal is generated and output to the wireless unit 2, and the wireless unit 2 generates and outputs the wireless signal. At this time, the slave unit 8 waits for a response from the master unit 1 after outputting the link establishment request. When base unit 1 transmits the ID request signal, wireless unit 9 receives the ID request signal, and the demodulated signal is output to data processing unit 11. Then, the control unit 17 is notified that the ID request signal has been received. The control unit 17 reads out its own ID code from the ID code memory 12 and starts transmitting the ID code, that is, the output sequence of the ID response, and the data processing unit 1 as in the case of outputting the link establishment request.
1. The wireless unit 9 operates, and the ID code is output to the base unit 1. In the master unit 1, the ID code transmitted from the slave unit 8 is received and transmitted to the control unit 6 as in the case of receiving the link establishment request. The control unit 6 searches the ID code memory 5 in which the ID code of the registered child device is stored, and confirms whether or not the received ID code belongs to the registered child device 8. If the received ID code is registered, it is determined that the communication is from the legitimate slave unit 8, an ID authorization response is output, the link between the master unit and the slave unit is established, and a call channel is designated. Through the sequence of
A call is established between the master and slave. If the received ID code is not registered, it is determined that the communication is from an unjust slave, and the communication is rejected.

Next, the flow of signals exchanged from the call request to the link establishment between the base unit and the handset of the conventional wireless telephone device will be described with reference to FIG. Handset 8 as shown
Then, when the user tries to make a call by pressing the call button, first, a link establishment request for requesting establishment of a link is output to the master unit 1. The master unit 1 outputs an ID request for requesting an ID code to confirm the slave unit 8, and the slave unit 8
Then, in response to this, it outputs its own ID code. Upon receiving the ID code from the child device 8, the parent device 1 compares the received ID code with the ID code of the registered child device, and if there is a match, outputs the ID authorization and specifies the call channel. After a sequence such as the above, the call between the base unit and the handset unit is started.

[0007]

However, in the above-described conventional wireless telephone device, since the cordless handset is confirmed only by the ID code, the ID code is tapped and the parent device of the wireless telephone device of another person is intercepted. There is a problem in that illegal use is made by making a call using the phone or making a call using the ID code of another person even in a cellular phone.

[0008] The present invention solves the above-mentioned conventional problems, and even if the ID code or the authentication code transmitted by the slave unit at the time of communication request is eavesdropped, the risk of unauthorized use can be reduced. The purpose is to provide a device.

[0009]

In order to solve the above-mentioned problems, a wireless telephone device of the present invention is a wireless communication between a first wireless device connected to a communication network and at least one second wireless device. A wireless telephone device that communicates using a signal, the authentication code generated and output by the first wireless device for the second wireless device, and a personal identification code stored in the second wireless device. Based on the above, it is configured to output an authentication code encoded by a predetermined method, and the first wireless device is configured to output the first wireless device based on a personal identification code and an authentication code stored in the first wireless device. Whether or not the encoding of the authentication code is correct is determined, and when the authentication code is determined to be correct encoding, the second wireless device is allowed to make a call.

[0010]

According to the above construction, the personal identification code stored in both the first wireless device and the second wireless device is used, and the second code is used.
For each communication request from the wireless device, the authentication code arbitrarily generated and transmitted in the first wireless device is combined with the secret code in the second wireless device, and predetermined coding is performed as the authentication code. 1 to the wireless device.

In the first wireless device, the second wireless device can be confirmed by judging that the received authentication code is correctly encoded based on the transmitted authentication code and the stored secret code. In this case, the second wireless device is allowed to make a call.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. It should be noted that components having the same effects as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted.

FIG. 1 is a block diagram of a radio telephone device showing a first embodiment of the present invention. In FIG. 1, 18 is a first
Is a master unit as a wireless device of the personal computer, 19 is a memory for a personal identification code as a personal identification code storage unit for storing the personal identification code set by the sub unit, 20 is an authentication code generation unit for generating an authentication code, and 21 is an authentication code. An authentication code memory as an authentication code storage unit that stores the authentication code generated by the generation unit 20, a determination circuit 22 as an authentication code determination unit that determines the authentication code sent from the slave, and a parent 23. The control unit controls the entire machine 18.

Further, 24 is a slave unit as a second wireless device, 25 is a code code memory as a secret code storage unit storing a secret code, and 26 is an authentication code sent from the master unit 18. An encoding circuit for generating an authentication code by combining the code and a personal identification code and converting the code by a predetermined method, and a control unit 27 for controlling the entire slave unit 24.

FIG. 2 is a diagram showing an example of a sequence of exchanging signals when there is a call request from the slave unit 24 to the master unit 18. The operation of the wireless telephone device configured as above will be described. When the call button of the keypad 13 of the handset 24 is pressed, a link establishment request is output from the handset 24. When the parent device 18 receives the link establishment request issued from the child device 24, the child device is confirmed using the authentication code and the password. First, a random code is generated by the authentication code generation unit 20 of the parent device 18, and is stored in the authentication code memory 21 as an authentication code. The authentication code generated at this time uses a wireless signal to generate a cordless handset 24.
Be transmitted to. Upon receiving the authentication code, the child device 24 transmits the code to the encoding circuit 26. Also,
The secret code stored in the secret code storage memory 25 is also transmitted to the encoding circuit 26. The encoding circuit 26 combines the authentication code and the personal identification code, and performs encoding for conversion by a predetermined method to generate an authentication code. The slave unit 24 transmits this authentication code to the master unit 18, and the master unit 18 transmits the received authentication code to the determination circuit 22. The determination circuit 22 determines whether or not the authentication code sent from the child device 24 is correctly encoded based on the code and the authentication code stored in the code memory 19 and the authentication code memory 21. Output to the control unit 23. If the received authentication code is correctly encoded, the control unit 23 determines that the communication is from a legitimate handset, establishes a link between the base unit and handset, and specifies a call channel sequence. After that, control is performed so that a call state is established between the master unit and the slave unit. If the received authentication code is not correct, it is determined that the communication is from an unauthorized slave and the communication is rejected.

Next, referring to FIG. 2, a flow of signals exchanged from a call request to a link establishment between a master unit and a slave unit of the wireless telephone apparatus shown in FIG. 1 which is an embodiment of the present invention will be described. . As shown in the figure, when the user presses the call button to make a call in the slave, first, a link establishment request for requesting the establishment of the link is output to the master. The master unit that receives the link establishment request outputs the authentication code generated by the authentication code generation unit to the slave unit. The slave unit combines the sent authentication code and personal identification code with the encoding circuit and outputs them to the master unit. The master unit determines whether the authentication code sent from the slave unit is correctly coded,
If it is encoded correctly, the link is established, and the call mode is entered after the call channel is specified. If the authentication code sent from the child device is not encoded correctly, communication is rejected at that point and the link is not established. In this embodiment, as an example of encoding, an example is shown in which the authentication code and the password are ANDed to obtain the authentication code. As shown in FIG. 2, the authentication code sent from the master unit is 011011011, PIN 110
If it is 10001, the correctly encoded authentication code is 01010001, and
01 is transmitted as an authentication code to the parent device.

Next, the second embodiment will be described. FIG. 3 is a block diagram of a wireless telephone device showing a second embodiment of the present invention. Those having the same effects and actions as those of the above-described conventional example and embodiment are designated by the same reference numerals, and the description thereof will be omitted. In FIG. 3, 28 is the first that can register three slave units.
Is a master unit as a wireless device of the device, 20 is an authentication code generation unit that generates an authentication code, and 21 is an authentication code generation unit 20.
The authentication code memory as an authentication code storage unit for storing the authentication code created in step 22, 22 is a determination circuit as an authentication code determination unit for determining the authentication code sent from the slave unit, and 29 is the master unit 28. ID as an ID code storage unit that stores the ID codes of the three registered slaves respectively
A code memory, 30 is a code code memory as a code code storage section in which the code of each of the three registered slaves is stored, and 31 is a control section which controls the master unit 28 as a whole.

Further, 32 is a slave unit as a second wireless device, 25 is a secret code memory as a secret code storage unit storing a secret code, and 26 is an authentication code sent from a master unit 28. An encoding circuit for generating an authentication code by combining the code and a secret code and converting the code in a predetermined method, and a control unit 33 for controlling the entire slave unit 32. Reference numeral 12 is an ID code memory as an ID code storage unit that stores its own ID code as in the conventional example.

FIG. 4 is a diagram showing an example of a sequence of signal exchanges when there is a call request from the handset 32 to the base 28. The operation of the wireless telephone device configured as above will be described. When the call button of the keypad 13 of the handset 32 is pressed, a link establishment request is output from the handset 32. When the parent device 28 receives the link establishment request issued from the child device 32, it outputs an ID request to the child device 32. Upon receiving the ID request, the control unit 33 of the child device 32 receives the I
The ID code is read from the D code memory 12 and output to the master unit 28. Upon receiving the ID code from the child device 32, the control unit 31 of the parent device 28 searches the ID code memory 29 to determine from which child device the call request is made. Then, the child device is reconfirmed using the authentication code and the password. A random code is generated by the authentication code generator 20 of the parent device 28 and stored in the authentication code memory 21 as an authentication code. The authentication code generated at this time is transmitted to the child device 32 using a wireless signal. Cordless handset 3
In 2, when the authentication code is received, the code is transmitted to the encoding circuit 26. Further, the secret code stored in the secret code storing memory 25 is also transmitted to the encoding circuit 26. The encoding circuit 26 combines the authentication code and the personal identification code, and performs encoding for conversion by a predetermined method to generate an authentication code. The child device 32 transmits this authentication code to the parent device 28. The control unit 31 of the parent device 28
The received authentication code and the authentication code stored in the authentication code memory 21 are transmitted to the determination circuit 22, and the identification code of the corresponding slave unit is read from the identification code memory 30 and transmitted to the determination circuit 22. In the determination circuit 22, the control unit 3
Based on the personal identification code and the authentication code received from 1, it is determined whether the authentication code is correctly encoded, and the control unit 3
Output to 1. When the received authentication code is correctly encoded, the control unit 31 determines that the communication is from a legitimate handset, establishes a link between the base unit and handset, and specifies a call channel sequence. After that, the control is performed so that the base unit and the slave unit are brought into a call state. If the received authentication code is not correct, it is determined that the communication is from an unauthorized slave and the communication is rejected.

Next, with reference to FIG. 4, a flow of signals exchanged from a call request to a link establishment between a master unit and a slave unit of the wireless telephone device shown in FIG. 3 which is the second embodiment of the present invention will be described. explain. As shown in the figure, when the user presses the call button to make a call in the slave, first, a link establishment request for requesting the establishment of the link is output to the master. An ID request signal is output from the parent device that has received the link establishment request, and the child device outputs an ID code. I from the child machine
Upon receiving the D code, the master unit checks whether the received ID code matches the ID code of any of the registered slave units, and if there is a match, the authentication code generated by the authentication code generation unit is used as the slave unit. Output to. If there is no matching ID code, the call is rejected here. When the authentication code is sent from the master unit, the slave unit combines the sent authentication code and secret code with a coding circuit to output the code to the master unit. The master unit determines whether the authentication code sent from the slave unit is correctly coded. If the authentication code is correctly coded, the link is established, and the call mode is entered after specifying the call channel. . If the authentication code sent from the child device is not encoded correctly, communication is rejected at that point and the link is not established. In the present embodiment, one of the registered slaves has a personal identification code of 11010001, and as an example of encoding, an example is shown in which a logical product of the authentication code and the personal identification code is taken as the authentication code. As shown in FIG. 4, when the authentication code sent from the master unit is 010110111 and the personal identification code is 11010001, the correctly encoded authentication code is 01010001, and the slave unit uses this 01010001 as the authentication code. Is being sent to the parent machine.

Next, the third embodiment will be described. FIG. 5 is a block diagram of a wireless telephone device showing a third embodiment of the present invention. Components having the same effects and actions as those of the above-mentioned conventional example and embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 5, reference numeral 34 is a master unit as a first wireless device, 20 is an authentication code generating section for generating an authentication code, and 21 is an authentication storing the authentication code generated by the authentication code generating section 20. An authentication code memory as a code storage unit, 22 is a judgment circuit as an authentication code judgment unit for judging an authentication code sent from a slave, and 35 is a rewritable personal identification code storage unit for storing a personal identification code. A PIN code memory, 36 is a PIN code generating section for generating a PIN code, 37 is an interface section (I / F section) as an input / output means for exchanging the PIN code, and 38 is an interface section 37 connected to the outside. Connection detecting section as a connection detecting means for detecting that
This is a control unit that controls the entire system.

Numeral 40 is a child device as a second wireless device, and 26 is an encoding code for reading the authentication code and the password code sent from the parent device 34 and converting them by a predetermined method. An encoding circuit for generating an authentication code, 41 is a PIN code memory as a rewritable PIN code storage section in which a PIN code is stored, and 42 is an interface section (I / F) as an input / output means for exchanging the PIN code. And 43 are control units for controlling the entire slave unit 40.

The master unit 34 and the slave unit 4 configured as described above
The operation from the call request to the call in the wireless telephone device configured from 0 is similar to that of the first embodiment shown in FIG. Here, the operation when the interface unit 37 of the parent device 34 and the interface unit 42 of the child device 40 are connected and each personal identification code is rewritten will be described.

When the interface unit 37 of the master unit 34 and the interface unit 42 of the slave unit 40 are connected, a detection signal is transmitted from the connection detecting unit 38 to the secret code generating unit 36. Upon receiving the detection signal, the secret code generation unit 36 randomly creates a secret code having a predetermined number of digits and outputs the secret code to the control unit 39. The control unit 39 outputs the new personal identification code created by the personal identification code generating unit 36 to the slave unit 40 via the interface unit 37, and
The content of the secret code memory 35 is rewritten with a new secret code. In the child device 40, the new personal identification code output from the parent device 34 is transmitted to the control unit 43 via the interface unit 42. Upon receiving the new personal identification code, the control unit 43 rewrites the content of the personal identification code memory 41 with the new personal identification code.

Next, a fourth embodiment will be described. FIG. 6 is a block diagram of a radio telephone device showing a fourth embodiment of the present invention. Components having the same effects and actions as those of the above-mentioned conventional example and embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 6, reference numeral 44 is a master unit as a first wireless device, 20 is an authentication code generating section for generating an authentication code, and 21 is an authentication storing the authentication code generated by the authentication code generating section 20. An authentication code memory as a code storage unit, 22 is a judgment circuit as an authentication code judgment unit for judging an authentication code sent from a slave, and 35 is a rewritable personal identification code storage unit for storing a personal identification code. A PIN code memory, 36 is a PIN code generating section for generating a PIN code, 37 is an interface section (I / F section) as an input / output means for exchanging the PIN code, 4
Reference numeral 5 is a connection detecting portion as a connection detecting means for detecting that the interface portion 37 is connected to the outside, and 46 is a secret code memory 35 for the secret code sent from the slave unit.
The secret code determiner for determining whether or not the secret code is the same as the secret code stored in the reference numeral 47 is a control unit for controlling the entire master unit 44.

Reference numeral 48 is a child device as a second wireless device, and 26 is an encoding code for reading the authentication code and the password code sent from the parent device 44 and converting them by a predetermined method. An encoding circuit for generating an authentication code, 41 is a PIN code memory as a rewritable PIN code storage section in which a PIN code is stored, and 42 is an interface section (I / F) as an input / output means for exchanging the PIN code. And 49 are control units for controlling the entire slave unit 48.

The master unit 44 and the slave unit 4 configured as described above
The operation from the call request to the call in the radiotelephone device constituted by 8 is similar to that of the first embodiment shown in FIG. Here, the operation when the interface unit 37 of the master unit 44 and the interface unit 42 of the slave unit 48 are connected and each personal identification code is rewritten will be described.

When the interface unit 37 of the master unit 44 and the interface unit 42 of the slave unit 48 are connected, a detection signal is transmitted from the connection detection unit 45 to the control unit 47. When the detection signal is transmitted, the control unit 47 requests the slave unit to output the personal identification code via the interface unit 37. The request to output the personal identification code is transmitted to the control unit 49 via the interface unit 42 of the child device 48. Control unit 4
9 receives the output request, the secret code memory 41
The personal identification code is read out and output to the master unit via the interface unit 42. The control unit 47 of the parent device 44 receives the personal identification code from the child device via the interface 37 and outputs it to the personal identification code determiner 46. In addition, the control unit 4
7 reads out the personal identification code stored in the personal identification code memory 35 and outputs it to the personal identification code determiner 46. The personal identification code determiner 46 determines whether the personal identification code sent from the slave and the personal identification code stored in the personal identification code memory 35 are the same, and outputs the same to the control unit 47. The control unit 47 activates the personal identification code generation unit 36 if the respective personal identification codes match. When activated by the control unit 47, the secret code generation unit 36 randomly creates a secret code having a predetermined number of digits and outputs it to the control unit 47. The control unit 47 outputs the new personal identification code created by the personal identification code generating unit 36 to the child device 48 via the interface unit 37, and rewrites the content of the personal identification code memory 35 with the new personal identification code. In the cordless handset 48,
The new secret code output from the master unit 44 is transmitted to the control unit 49 via the interface unit 42. Upon receiving the new personal identification code, the control unit 49 rewrites the content of the personal identification code memory 41 with the new personal identification code.

Next, the fifth embodiment will be described. FIG. 7 is a block diagram of a wireless telephone device showing a fifth embodiment of the present invention. Components having the same effects and actions as those of the above-mentioned conventional example and embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 7, reference numeral 50 is a master unit as a first wireless device, 20 is an authentication code generating unit for generating an authentication code, and 21 is an authentication storing the authentication code generated by the authentication code generating unit 20. An authentication code memory as a code storage unit, 22 is a judgment circuit as an authentication code judgment unit for judging an authentication code sent from a slave, and 35 is a rewritable personal identification code storage unit for storing a personal identification code. A code code memory, 36 is a code code generating section for generating a code, 51 is a receiving section for receiving and demodulating a wireless signal, 52 is a transmitting section for modulating voice and data to generate a wireless signal, and 53 is a code. A personal identification code encryptor as an encryption unit that encrypts a code, and a control unit 54 that controls the master device 50 as a whole.

Numeral 55 is a child device as a second wireless device, and numeral 26 is a combination of the authentication code and the personal identification code sent from the parent device 50, which is encoded by a predetermined method. An encoding circuit for generating an authentication code, 41 is a code code memory as a rewritable code code storage section in which a code is stored, 56 is a receiving section for receiving and demodulating a wireless signal, 57 is voice or data, etc. Is a transmitter for modulating a wireless signal, 58 is a code code decoder as a decoding unit for decoding the encrypted code code and returning it to the original code, 59 is a control unit for controlling the entire slave unit 55 Is.

FIG. 8 is a diagram showing an example of a sequence of signal exchanges when there is a call request from the handset unit 55 to the base unit 50 and the secret code is rewritten. The operation of the wireless telephone device configured as above will be described. When the call button of the keypad 13 of the handset 55 is pressed, a link establishment request is output from the handset 55. Base unit 5
When 0 receives the link establishment request issued from the child device 55, the control unit of the parent device 50 activates the authentication code generation unit 20, and the authentication code generation unit 20 generates a random code, and the control unit 54 Is output to. The authentication code sent to the control unit 54 is stored in the authentication code memory 21.
Further, the control unit 54 of the parent device 50 activates the data processing unit 4 and outputs this authentication code, and in the data processing unit 4, the authentication code is transmitted to the transmission unit 52, and the authentication code is transmitted to the child device 55 as a wireless signal. Is output. Upon receiving the authentication code, the child device 55 transmits the code to the encoding circuit 26. In addition, the secret code stored in the secret code storage memory 41 is also transmitted to the encoding circuit 26. The encoding circuit 26 combines the authentication code and the personal identification code, and performs encoding for conversion by a predetermined method to generate an authentication code. The control unit 59 of the child device 55 activates the data processing unit 11 and outputs this authentication code, and the data processing unit 11
Then, the authentication code is transmitted to the transmission unit 57, and the authentication code is output to the parent device 50 as a wireless signal. In the master unit 50, the slave unit 5
The authentication code from 5 is demodulated by the receiving unit 51 and sent to the data processing unit 4. The data processing unit 4 sends the authentication code to the control unit 54. When the control unit 54 receives the authentication code,
The authentication code is transmitted to the determination circuit 22. In addition, the control unit 54
Is an authentication code stored in the authentication code memory 21 and
The personal identification code stored in the personal identification code memory 35 is transmitted to the read determination circuit 22. The determination circuit 22 determines whether the authentication code sent from the handset 55 is correctly encoded, based on the code and the authentication code stored in the code memory 35 and the authentication code memory 21, Output to the control unit 54. If the received authentication code is encoded correctly, the control unit 54 determines that the communication is from a legitimate handset and activates the personal identification code generation unit 36. When activated by the control unit 54, the secret code generation unit 36 randomly creates a secret code having a predetermined number of digits and outputs it to the control unit 54. The control unit 54 outputs the personal identification code read in advance from the personal identification code memory 35 and the new personal identification code generated by the personal identification code generating unit 36 to the personal identification code encryptor 53, and the personal identification code encryptor outputs the personal identification code. The personal identification code created by the code generation unit 36 and the personal identification code stored in the personal identification code memory 35 are combined, encrypted by a predetermined method, and output to the control unit 54. The control unit 54 outputs the encrypted personal identification code to the data processing unit 4. The data processing unit 4 performs data processing for outputting the encrypted personal identification code as a wireless signal, outputs the data to the transmitting unit 52, and the personal identification code encrypted by the transmitting unit 52 is transmitted as a wireless signal to the child device 55. Is output to. In the child device 55, when the encrypted secret code is received by the receiving unit 56, it is transmitted to the data processing unit 11, and is transmitted from the data processing unit 11 to the control unit 59. The control unit 59 outputs the received encrypted personal identification code to the personal identification code decoder 58. Further, the control unit 59 outputs the personal identification code stored in the personal identification code memory 41 that has been read in advance to the personal identification code decoder 58. The personal identification code decoder 58 uses the personal identification code stored in the personal identification code memory to store the encrypted personal identification code sent from the main unit in a predetermined manner using the personal identification code generating unit 36 of the main unit 50. It is decrypted into a new personal identification code created in and output to the control unit 59. The control unit 59 outputs the new personal identification code decoded by the personal identification code decoder 58 to the personal identification code memory 41 to update the content of the personal identification code memory 41. In addition, the control unit 59 controls the data processing unit 11 to output a new personal identification code reception confirmation signal that notifies the master unit that the new personal identification code has been received, and the data processing unit 11 transmits the new personal identification code reception confirmation signal. It is created, transmitted to the transmission unit 57, and output to the parent device 50 as a radio signal. Reception unit 5 of base unit 50
When the new PIN code reception confirmation signal from the slave unit is received at 1 and transmitted to the data processing unit 4, the data processing unit 4
Outputs to the control unit 54 a signal notifying that the slave unit has received the new personal identification code, and the control unit 54 stores the new personal identification code previously generated by the personal identification code generating unit 36 in the personal identification code memory 35. It is output and the content of the secret code memory 35 is updated.

Next, with reference to FIG. 8, a flow of signals exchanged from a call request to a link establishment between a base unit and a handset of the wireless telephone device shown in FIG. 7 which is a fifth embodiment of the present invention will be described. explain. As shown in the figure, when the user presses the call button to make a call in the slave, first, a link establishment request for requesting the establishment of the link is output to the master. Upon receiving the link establishment request, the master unit outputs the authentication code generated by the authentication code generation unit to the slave unit. The slave unit combines the sent authentication code and secret code with the encoding circuit and outputs them to the master unit. The master unit determines whether the authentication code sent from the slave unit is correctly coded, and if it is correctly coded, it starts the sequence of rewriting the personal identification code, and outputs the new personal identification code and the old personal identification code. The encrypted new PIN code created in combination is output to the handset. The slave unit decrypts the encrypted new PIN code received using the old PIN code to update the PIN code and outputs a new PIN code reception confirmation signal. The base unit is
When it receives the new PIN code reception confirmation signal, it updates its own PIN code. After that, the normal call mode is advanced through a sequence of specifying a call channel.

In this embodiment, as an example of encoding the authentication code, an example is shown in which a logical product of the authentication code and the personal identification code is taken as the authentication code, and as shown in FIG. When the received authentication code is 010110111 and the personal identification code is 11010001, the correctly encoded authentication code is 01010001, and the child device transmits this 01010001 as the authentication code to the parent device. Further, as an example of encryption of the personal identification code, the present embodiment shows a method of encryption by taking the sum of the old personal identification code and the new personal identification code, which is stored in advance in each parent device Old PIN code is 1 as above
1010001, the newly created PIN is 0101
When the number is 1001, the parent machine sends 100101010, which is the sum of the encrypted personal identification codes, to the child machine. In addition, the encrypted secret code 100
Upon receiving 101010, the cordless handset subtracts the old personal identification code 11010001 from the value and obtains the new personal identification code 0101.
1001 is being decrypted.

FIG. 9 is a block diagram of a radio telephone device showing a sixth embodiment of the present invention. In FIG. 9, 60 is the first
Is a master unit as a wireless device of the personal computer, 19 is a memory for a personal identification code as a personal identification code storage unit for storing the personal identification code set by the sub unit, 20 is an authentication code generation unit for generating an authentication code, and 21 is an authentication code. An authentication code memory as an authentication code storage unit that stores the authentication code generated by the generation unit 20, 22 is a determination circuit as an authentication code determination unit that determines the authentication code sent from the slave unit, and 61 is invalid. A counter as a counting unit that counts the number of call requests from the child device, 62 is a reset button as an input means for returning to a normal state when the call is rejected, and 63 is the entire parent device 60. It is a control unit that performs control.

Reference numeral 24 is a slave unit as a second wireless device, 25 is a password memory as a secret code storage unit storing a secret code, and 26 is an authentication code sent from the master unit 60. An encoding circuit that combines the password code and the personal identification code to generate an authentication code by performing encoding for conversion according to a predetermined method, and 27 is a control unit that controls the entire slave unit 24.

The operation of the wireless telephone device configured as described above will be described. The operation of the parent device 60 from the call request from the legitimate child device having the same personal identification code to the call state is the same as that of the first embodiment shown in FIG. The operation when there is a call request from the machine will be described.

In the present description, the cordless handset 24 is assumed to be an illegal cordless handset, and the secret code stored in the secret code memory is
It is assumed that 11001100, which is a secret code of the parent device, is stored. When making a call request from the child device 24, the user presses the call button of the keypad 13 of the child device 24 and outputs a link establishment request. Upon receiving the link establishment request issued from the child device 24, the parent device 60 confirms the child device using the authentication code and the password. Figure 1
Similar to the first embodiment shown in FIG. 5, a random code is generated by the authentication code generator 20 of the master device 60 and stored in the authentication code memory 21 as an authentication code. The authentication code generated at this time uses a wireless signal to generate a cordless handset 24.
Be transmitted to. Upon receiving the authentication code, the child device 24 transmits the code to the encoding circuit 26. Also,
The secret code stored in the secret code memory 25 is also transmitted to the encoding circuit. The encoding circuit 26 combines the authentication code and the personal identification code, performs encoding for conversion by a predetermined method, and generates an authentication code. Assuming that the authentication code sent from the parent device and the method of generating the authentication code are the same as those in the first embodiment shown in FIG. 1, the child device 24
Is the authentication code 011011011 sent from the base unit
PIN code that you remembered or guessed 1
101100 and combination logical product are calculated, and this value 010
01000 is transmitted to the master device 60 as an authentication code. The master device 60 transmits the received authentication code to the determination circuit 22. The determination circuit 22 determines whether or not the authentication code sent from the child device 24 is correctly encoded based on the code and the authentication code stored in the code memory 19 and the authentication code memory 21, Output to the control unit 63. The personal identification code stored in the personal identification code memory 19 of the parent device 60 is 1101000 as in the first embodiment shown in FIG.
If it is 1, the correctly encoded authentication code is 0101
Since it is 0001, the authentication code 0 sent from the child device
1001000 does not match, and the determination circuit 22 determines that the control unit 6
3 is notified of the mismatch of the authentication codes. When the control unit 63 is notified that the authentication codes do not match, the handset that makes the call request determines that the handset is an unauthorized handset and rejects the call. Also, the number of times the call is rejected, which is stored in the counter 61 and is determined to be an unauthorized child device, is increased by one. At this time, counter 6
When the value of 1 reaches a predetermined value, the control unit 6
3 controls the master device 60 so as to enter a mode in which all call requests are rejected. When the parent device 60 becomes in this state, the parent device 60 unconditionally rejects the call regardless of the call request from any child device regardless of whether the child device is a legitimate child device or an unauthorized child device The machine repeatedly makes call requests, guesses the authentication code, and prevents the call from being authorized. Further, the above-described base unit 60 in the call refusal state is returned to the normal operation state by pressing the reset button 62. The reset button 62 is pressed by the user of the base unit 60,
When the reset signal is transmitted to the control unit 63, the control unit 63
Returns the value of the counter 61 to 0 and controls the master device 60 to operate in the normal operating state.

Next, the seventh embodiment will be described. FIG. 10 is a block diagram of a wireless telephone device showing a seventh embodiment of the present invention. The same effects as the above-mentioned conventional example and example,
The components having the same functions are designated by the same reference numerals, and the description thereof will be omitted. In FIG. 10, reference numeral 64 denotes a master device as a first wireless device capable of registering three slave devices, 20 is an authentication code generating unit for generating an authentication code, and 21 is an authentication code generating unit 20. An authentication code memory as an authentication code storage unit that stores an authentication code, 22 is a determination circuit as an authentication code determination unit that determines the authentication code sent from the slave unit, and 29 is 3 registered in the master unit 64. I as an ID code storage unit in which the ID codes of the slave units are respectively stored.
D code memory, 30 is a code code memory as a code code storage unit that stores the code of each of the three registered slaves, and 65 is an illegal call using the registered slave IDs. A counter serving as a counting unit that counts and stores the number of times a request is made for each corresponding ID, and 66 is a child device having a corresponding ID when the child device having any ID of the counter 65 reaches a predetermined value. A reset button as an input means for returning the call to the normal state from the call rejected state, and a control unit for controlling the entire base unit 64.

Reference numeral 32 is a child device as a second wireless device, 25 is a code code memory as a code code storage section in which a code is stored, and 26 is an authentication code sent from the master unit 64. An encoding circuit that combines the password code and the personal identification code to generate an authentication code by performing encoding for conversion according to a predetermined method, and 33 is a control unit that controls the entire slave unit 32.

The operation of the radio telephone device configured as described above will be described. First, the operation when the child device 32 is an authorized child device will be described. Handset 32
When the call button of the keypad 13 is pressed, a link establishment request is output from the handset 32. The parent machine 64 is the child machine 32
When receiving the link establishment request issued from the device, the ID request is output to the child device 32. Handset 32 that received the ID request
The control unit 33 reads the ID code from the ID code memory 12 and outputs it to the parent device 64. Upon receiving the ID code from the child device 32, the controller 67 of the parent device 64 searches the ID code memory 29 to determine from which child device the call request is made, and the counter 65 determines the ID of the child device. It is used to check the number of times a call request was made illegally and the call was rejected. When the number of times the call stored in the counter 65 is rejected reaches a predetermined value, the control unit 67 controls the master device 64 to reject the call unconditionally. If the number of times the call stored in the counter 65 has been rejected has not reached a predetermined value, the child code is subsequently used by using the authentication code and the PIN code as in the second embodiment shown in FIG. The machine is reconfirmed and the call mode is entered.

Next, the operation when there is a call request from an unauthorized child device will be described. In this description, the child device 32 is an unauthorized child device that eavesdrops on the ID code stored in the ID code memory 29 exchanged when the parent device 64 previously communicated and uses the eavesdropped ID code. If there is,
It is assumed that the secret code stored in the secret code memory is 11001100 which is different from the secret code of the parent device 64. When making a call request from the child device 32, the user presses the call button on the keypad 13 of the child device 32 and outputs a link establishment request. Upon receiving the link establishment request issued from the child device 32, the parent device 64 receives the call request from the legitimate child device, as described above.
The ID request is output to the child device 32. Upon receiving the ID request, the control unit 33 of the slave 32 reads the ID code of the slave registered in the master 64 obtained by eavesdropping or the like from the ID code memory 12 and outputs it to the master 64. The control unit 67 of the parent device 64 that has received the ID code from the child device 32.
Searches the ID code memory 29 to determine from which handset the call request is made, and the counter 65 uses the ID of the handset to check how many times the call request was illegally made and the call was rejected. . When the number of times the call stored in the counter 65 is rejected reaches a predetermined value, the control unit 67 unconditionally controls the base unit 64 to reject the call. If the number of times the call stored in the counter 65 is rejected has not reached the predetermined value, the sequence for confirming the child device using the authentication code and the personal identification code is started, and the number shown in FIG. Two
In the same manner as in the embodiment of FIG.
Then, a random code is generated and stored in the authentication code memory 21 as an authentication code. The authentication code generated at this time is transmitted to the child device 32 using a wireless signal. Upon receiving the authentication code, the child device 32 transmits the code to the encoding circuit 26. Also, the encoding circuit 2
The personal identification code stored in the personal identification code memory 25 is also transmitted to 6. The encoding circuit 26 combines the authentication code and the personal identification code, performs encoding for conversion by a predetermined method, and generates an authentication code. Assuming that the authentication code sent from the parent device 64 and the method of generating the authentication code are the same as those in the second embodiment shown in FIG. 3, the child device 32 recognizes the authentication code 011011011 sent from the parent device. PIN code 1100 that you remember or guess
1100 and the logical product of combination are obtained, and this value 01001
000 is transmitted to the parent device 64 as an authentication code. Base unit 64
Then, the received authentication code is transmitted to the determination circuit 22. The determination circuit 22 determines whether the authentication code sent from the child device 32 is correctly encoded based on the identification code and the authentication code stored in the authentication code memory 21 and the identification code memory 30. Output to the control unit 67. Base unit 6
Assuming that the secret code of the slave unit having the ID code sent from the slave unit 32 stored in the secret code memory 30 of 4 is 11010001, as in the second embodiment shown in FIG.
Since the correctly encoded authentication code is 01010001, the authentication code 0100100 sent from the child device is displayed.
Since it does not match 0, the determination circuit 22 notifies the control unit 67 of the mismatch of the authentication codes. When the control unit 67 is informed that the authentication codes do not match, the mobile device requesting the call determines that the mobile device is an unauthorized mobile device and rejects the call. Also, the value of the corresponding counter of the counter 65, which stores the number of times that the call having the corresponding ID code is judged to be an unauthorized one and the call is rejected, is incremented by one. At this time, when the value of the counter 65 reaches a predetermined value, the control unit 67
The base unit 64 is set to the mode in which the call request from the slave unit that has made the call request using the corresponding ID code is rejected.
To control. When the parent device 64 enters this state, the corresponding I
Regardless of whether a call request is made by using a corresponding ID code regardless of whether it is a legitimate handset having a D code or an unauthorized handset, the base unit 64 unconditionally requests a call from any handset. An unauthorized child device that has made a call request by rejecting the call and eavesdropping the ID code repeatedly makes a call request, guesses the authentication code, and prevents the call from being permitted. In addition, the above-mentioned base unit 64 in the call refusal state
Returns to the normal operating state by pressing the reset button 66. The reset button 66 may be prepared for each registered child device. When the reset button 66 is pressed by the user of the base unit 64 and the reset signal is transmitted to the control unit 67, the control unit 67 returns all the values of the counter 65 or the values of the corresponding handset unit to 0. , The base unit 64 is controlled to operate in a normal operating state.

FIG. 11 is a block diagram of a radiotelephone device showing an eighth embodiment of the present invention. In FIG. 11, reference numeral 68 is a master unit as a first wireless device, 20 is an authentication code generation unit that generates an authentication code, and 21 is an authentication code storage unit that stores the authentication code generated by the authentication code generation unit 20. As an authentication code memory, 22 is a determination circuit as an authentication code determination unit that determines the authentication code sent from the child device, and 69 is a password as a code code storage unit storing a plurality of passwords. A memory, 70 is a personal identification code selection unit that randomly determines which personal identification code to use when encoding the authentication code, and 71 is a control unit that controls the entire base unit 68.

Reference numeral 72 is a child device as a second wireless device, and 26 is a combination of the authentication code and the secret code sent from the parent device 68, which is encoded by a predetermined method. An encoding circuit for generating an authentication code, 73 is a code code memory as a code code storage section in which a plurality of code codes are stored, and 74 is a control section for controlling the entire slave unit 72.

FIG. 12 is a diagram showing an example of a sequence of signal exchanges when there is a call request from the handset 72 to the base 68. The operation of the wireless telephone device configured as above will be described. Keypad 13 of handset 72
When the call button of is pressed, the link establishment request is issued to the child device 72.
Will be output. When the parent device 68 receives the link establishment request issued from the child device 72, the child device is confirmed using the authentication code and the password. The control unit 71 of the parent device 68
The authentication code generation unit 20 is activated, and the authentication code generation unit 20 is activated.
A random code is generated and stored as an authentication code in the authentication code memory 21. Further, the control unit 71 activates the personal identification code selection unit 70, and the personal identification code selection unit 70 is activated.
Randomly determines which personal identification code to use when encoding the authentication code and informs the control unit 71. Control unit 7
1 is an authentication code created by the authentication code generation unit 20,
A signal designating the secret code determined by the secret code selecting unit 70 is output to the data processing unit 4. Data processing unit 4
Outputs a combination of the selection code of the personal identification code and the authentication code to the wireless unit 2, and the wireless unit outputs a wireless signal.
When the wireless signal combining the selection code of the personal identification code and the authentication code is received by the wireless unit 9 of the child device 72, the wireless signal combining the selection number of the personal identification code and the authentication code is demodulated and the data processing unit 11 Be transmitted to. The data processing unit 11 sends the selection number of the personal identification code and the authentication code to the control unit 74. The control unit 74 transmits the received authentication code to the encoding circuit 26, reads the personal identification code designated by the selection number from the personal identification code memory 73, and transmits it to the encoding circuit 26 in the same manner. The encoding circuit 26 combines the authentication code and the personal identification code, performs conversion encoding by a predetermined method to generate an authentication code, and outputs the authentication code to the control unit 74. The control unit 74 controls the data processing unit 11 to output the authentication code received from the encoding circuit 26, the data processing unit 11 outputs the authentication code to the wireless unit 9, and the wireless unit 9 outputs the wireless signal as a wireless signal. To be done. When the wireless signal of the authentication code is received by the wireless unit 2 of the parent device 68, the wireless signal of the authentication code is demodulated and transmitted to the data processing unit 4. The data processing unit 4 sends the authentication code to the control unit 71. The control unit 71 transmits the received authentication code to the determination circuit 22, and also reads out the identification code designated by the tradeoff selection number and the authentication code stored in the authentication code memory 21, and similarly determines the determination circuit 22.
Tell. The determination circuit 22 determines whether or not the authentication code sent from the slave unit has been combined with the specified personal identification code and the authentication code and is predetermined, and outputs it to the control unit 71. When the received authentication code is correctly encoded, the control unit 71 determines that the communication is from a legitimate handset, establishes a link between the base unit and handset, and specifies a call channel sequence. After that, the control is performed so that the base unit and the slave unit are brought into a call state. If the received authentication code is not correct, it is determined that the communication is from an unauthorized slave and the communication is rejected.

Further, as a developmental application of this embodiment, a method is conceivable in which the above-mentioned authentication code is repeatedly used to confirm the slave unit to prevent unauthorized use more reliably. in this case,
After checking the cordless handset with the first authentication code described above, generate a new certification code again and select the personal identification code and send it to the cordless handset again, as in the first time. Receive a new authentication code and reconfirm.

Next, with reference to FIG. 12, a flow of signals exchanged from the call request to the link establishment between the parent and child units of the wireless telephone device shown in FIG. 11 which is an embodiment of the present invention will be described. . Note that the example of FIG. 11 shows an example in which the child device is confirmed using a repeated authentication code, which is an advanced application of the above-described embodiment. As shown in the figure, when the user presses the call button to make a call in the slave, first, a link establishment request for requesting the establishment of the link is output to the master. Upon receiving the link establishment request, the master unit outputs the secret code selection number determined by the secret code selecting unit and the authentication code generated by the authentication code generating unit to the slave unit.
The cordless handset encodes with the encoding circuit which combined the sent authentication code and the secret code designated by the selection number, and outputs it to the parent device. The master unit determines whether the authentication code sent from the slave unit is correctly coded. If the code is correctly coded, the verification with the second authentication code is started and the above-mentioned first verification is performed. Similarly, the selection code of the personal identification code newly determined by the personal identification code selection unit and the authentication code generated by the authentication code generation unit are output to the child device. The cordless handset encodes the new authentication code and the secret code designated by the selection number, which have been sent, by the encoding circuit and outputs it to the parent device. The master unit determines whether the second authentication code sent from the slave unit is correctly coded, and if it is correctly coded, establishes a link, specifies the call channel, etc., and sets the call mode. Enter If the authentication code sent from the child device is not encoded correctly, the communication is rejected at that point and the link is not established. In the present embodiment, the first personal identification code 11010001 and the third personal identification code stored in the personal identification code memories of the respective base units are 1 and 1.
0101101, the personal identification code designated at the time of the first confirmation is the first personal identification code, the authentication code at that time is 01011011, and the personal identification code designated at the time of the second confirmation is the third personal identification code. In this example, the authentication code is 10011010, and as an example of encoding, the logical product of the authentication code and the personal identification code is taken as the authentication code. As shown in FIG. 12, when the authentication code sent from the base unit is 011011011 and the personal identification code designated by the selection number is 11010001, the correctly encoded authentication code is 010100.
The number becomes 01, and the child device transmits this 01010001 to the parent device as an authentication code. Similarly, when the authentication code sent from the parent device is 10011010 and the personal identification code specified by the selection number is 10101101, the correctly encoded authentication code is 10001000, and the child device is 10001000 in the second confirmation. Is transmitted to the base unit as an authentication code.

FIG. 13 is a block diagram of a radio telephone device showing a ninth embodiment of the present invention. In FIG. 13, reference numeral 75 is a master unit as a first wireless device, 20 is an authentication code generation unit that generates an authentication code, and 21 is an authentication code storage unit that stores the authentication code generated by the authentication code generation unit 20. As an identification code memory, 69 is a PIN code memory as a PIN code storage section in which a plurality of PINs are stored, and 76 is a random code that determines which PIN code to use when encoding the ID code. A personal identification code selection unit for selecting the personal identification code, 77 is a determination circuit as an authentication code determination unit that determines a plurality of authentication codes sent from the slave unit, and 78 is a control unit for controlling the entire main unit 75. Is.

Reference numeral 79 is a child device as a second wireless device, 73 is a code code memory as a code code storage section storing a plurality of code codes, and 80 is a base unit 75.
An encoding circuit that combines the authentication code sent from the device and the specified personal identification code, performs encoding for conversion in a predetermined method to generate an authentication code, and 81 is a control unit that controls the entire slave unit 79. Is.

FIG. 14 is a diagram showing an example of a sequence of signal exchanges when there is a call request from the child device 79 to the parent device 75. The operation of the wireless telephone device configured as above will be described. Keypad 13 of cordless handset 79
When the call button of is pressed, a link establishment request is issued to the child device 79.
Will be output. When the base unit 75 receives the link establishment request issued from the handset unit 79, the handset unit is confirmed using the authentication code and the password. The control unit 78 of the parent device 75
The authentication code generation unit 20 is activated, and the authentication code generation unit 20 is activated.
A random code is generated and stored as an authentication code in the authentication code memory 21. Further, the control unit 78 activates the personal identification code selection unit 76, and the personal identification code selection unit 76 is activated.
Randomly determines a plurality of personal identification codes to be used when encoding the authentication code and informs the control unit 78 of the identification code. Control unit 78
Outputs to the data processing unit 4 the authentication code generated by the authentication code generation unit 20 and a signal that is determined by the security code selection unit 76 and specifies a plurality of security codes. The data processing unit 4 combines the selection numbers of a plurality of personal identification codes and the authentication code and outputs them to the wireless unit 2, and the wireless unit outputs a wireless signal. When the wireless signal combining the selection numbers of the plurality of personal identification codes and the authentication code is received by the wireless unit 9 of the child device 79, the wireless signal combining the selection numbers of the plurality of personal identification codes and the authentication code is demodulated, It is transmitted to the data processing unit 11. The data processing unit 11 notifies the control unit 81 of the selection numbers of the plurality of personal identification codes and the authentication code. Control unit 81
Transmits the received authentication code to the encoding circuit 80, reads all the identification codes designated by the plurality of selection numbers from the identification code memory 73, and transmits them to the encoding circuit 80 in the same manner. The encoding circuit 80 sequentially combines the received personal identification code and authentication code, performs predetermined encoding, generates an identification code for each designated personal identification code, and outputs it to the control unit 81. The control unit 81 controls the data processing unit 11 to sequentially output all the authentication codes received from the encoding circuit 80, and the data processing unit 1
The authentication code is output to the wireless unit 9 from 1 and output as a wireless signal from the wireless unit 9. When the wireless signal of the authentication code is received by the wireless unit 2 of the parent device 75, the wireless signal of the authentication code is demodulated and transmitted to the data processing unit 4. The data processing unit 4 transmits all the authentication codes to the control unit 78. The control unit 78 sequentially determines all the received authentication codes from the determination circuit 77.
In addition, all the identification codes designated by the previously read selection number and the authentication code stored in the authentication code memory 21 are read out and similarly transmitted to the determination circuit 77. The judgment circuit 77 combines all the authentication codes sent from the slave unit with the specified personal identification code and the authentication code, judges whether or not the predetermined coding has failed, and outputs it to the control unit 78. When all the received authentication codes are correctly encoded, the control unit 78 determines that the communication is from a legitimate slave, establishes a link between the master and slaves, and specifies a call channel, etc. After the sequence of, the control is performed so that the base unit and the slave unit are brought into a call state. If the received authentication code is not correct, it is determined that the communication is from an unauthorized slave and the communication is rejected.

Further, as a developmental application of the present embodiment, a method is conceivable in which the above-mentioned authentication code is repeatedly used to confirm the slave unit to more reliably prevent unauthorized use. in this case,
After checking the cordless handset by the above-mentioned first authentication code, generate a new certification code again like the first time, and select a plurality of personal identification codes to send to the cordless handset. Receive a new authentication code from and reconfirm.

Next, with reference to FIG. 14, a flow of signals exchanged from a call request to a link establishment between a master unit and a slave unit of the wireless telephone device shown in FIG. 13 which is an embodiment of the present invention will be described. . In the present example, an example is shown in which two personal identification codes are designated by the personal identification code selection unit. As shown in the figure, when the user presses the call button to make a call in the slave, first, a link establishment request for requesting the establishment of the link is output to the master. Upon receiving the link establishment request wheel, the master unit outputs the selection numbers of the two secret codes determined by the secret code selecting unit and the authentication code generated by the authentication code generating unit to the slave unit. The slave unit encodes the sent authentication code and the two secret codes specified by the selection number by a combination encoding circuit, and sequentially outputs the two authentication codes generated by the master unit. The master unit determines whether the two authentication codes sent from the slave unit are correctly coded. If they are correctly coded, the link is established, the call channel is specified, and the call mode is set. Enter If the authentication code sent from the child device is not encoded correctly, the communication is rejected at that point and the link is not established. It should be noted that in the present embodiment, the first code stored in the memory for the personal identification code of each base unit
Of the personal identification code of 11010001, the third personal identification code of 10101101, the two personal identification codes designated by the personal identification code selection section are the first personal identification code and the third personal identification code, and the authentication code of 011011011, As an example of encoding, an example in which a logical product of an authentication code and a personal identification code is taken as an authentication code is shown. As shown in FIG. 14, the authentication code sent from the parent device is 0101.
1011 and the PIN code designated by the selection number is 1
If it is 1010001, the correctly encoded authentication code is 01010001, and
001 is transmitted to the parent device as the first authentication code.
Similarly, the PIN code designated by the selection number is 10
In the case of 101101, the correctly encoded authentication code is 00001001, and the cordless handset is 00001001.
Is transmitted to the parent device as the second authentication code.

FIG. 15 is a block diagram of a radio telephone device showing a tenth embodiment of the present invention. In FIG. 15, 82
Is a master unit as a first wireless device, 20 is an authentication code generation unit for generating an authentication code, 21 is an authentication code as an authentication code storage unit for storing the authentication code generated by the authentication code generation unit 20 A memory, 69 is a memory for a personal identification code as a personal identification code storage unit in which a plurality of personal identification codes are stored, and 76 is a random determination of which personal identification code is used when encoding an authentication code, and a plurality of personal identification codes are selected. A code code selection unit, a composite judgment circuit 83 as an authentication code judgment unit for judging the authentication code sent from the slave unit, and a control unit 84 for controlling the entire master unit 82.

Reference numeral 85 is a child device as a second wireless device, 73 is a code code memory as a code code storage section in which a plurality of code codes are stored, and 86 is a base unit 82.
A composite encoding circuit that combines the authentication code sent from the device and all the specified personal identification codes, performs conversion to convert in a predetermined method, and generates an authentication code,
A control unit 87 controls the entire slave unit 85.

FIG. 15 is a diagram showing an example of a sequence of signal exchanges when a call request is made from the handset 85 to the base 82. The operation of the wireless telephone device configured as above will be described. Keypad 13 of handset 85
When the call button of is pressed, a link establishment request is issued to the child device 85.
Will be output. When the master unit 82 receives the link establishment request issued from the slave unit 85, the slave unit is confirmed using the authentication code and the password. The control unit 84 of the base unit 82
The authentication code generation unit 20 is activated, and the authentication code generation unit 20 is activated.
A random code is generated and stored as an authentication code in the authentication code memory 21. Further, the control unit 84 activates the personal identification code selection unit 76, and the personal identification code selection unit 76 is activated.
Randomly determines a plurality of personal identification codes to be used when encoding the authentication code, and informs the control unit 84 of them. Control unit 84
Outputs to the data processing unit 4 a signal designating the authentication code generated by the authentication code generating unit 20 and the plurality of personal identification codes determined by the personal identification code selecting unit 76. The data processing unit 4 combines the selection numbers of a plurality of personal identification codes and the authentication code and outputs them to the wireless unit 2, and the wireless unit outputs a wireless signal. When a wireless signal in which a selection number of a plurality of personal identification codes and an authentication code are combined is received by the wireless unit 9 of the child device 85, a wireless signal in which a selection number of a plurality of identification codes and an authentication code are combined is demodulated, It is transmitted to the data processing unit 11. The data processing unit 11 notifies the control unit 87 of the selection numbers of the plurality of personal identification codes and the authentication code. Control unit 8
7 transmits the received authentication code to the composite encoding circuit 86, reads all the secret codes specified by the plurality of selection numbers from the secret code memory 73, and similarly transmits them to the composite encoding circuit 86. The composite encoding circuit 86 combines all the received personal identification code and authentication code, performs predetermined encoding to generate an authentication code, and outputs the authentication code to the control unit 87. The control unit 87 controls the data processing unit 11 so as to output the authentication code received from the composite encoding circuit 86, and the data processing unit 11 causes the wireless unit 9 to output the authentication code.
The authentication code is output to and the wireless unit 9 outputs it as a wireless signal. The wireless signal of the authentication code is the wireless unit 2 of the base unit 82.
When received at, the wireless signal of the authentication code is demodulated and transmitted to the data processing unit 4. The data processing unit 4 sends the authentication code to the control unit 84. The control unit 84 transmits the received authentication code to the composite determination circuit 83, and also reads out all the identification codes designated by the previously read selection number and the authentication code stored in the authentication code memory 21. To the composite determination circuit 83. Complex judgment circuit 8
Reference numeral 3 indicates whether or not the authentication code sent from the slave unit is combined with all the specified personal identification codes and authentication codes, and whether or not a predetermined coding is performed.
Output to 4. If the received authentication code is correctly encoded, the control unit 84 determines that the communication is from a legitimate handset, establishes a link between the base unit and handset, and sets a sequence such as designation of a call channel. After that, control is performed so that a call state is established between the master unit and the slave unit. If the received authentication code is not correct, it is determined that the communication is from an unauthorized slave and the communication is rejected.

Further, as a developmental application of the present embodiment, a method is conceivable in which the above-mentioned authentication code is repeatedly used to confirm the slave unit to more reliably prevent unauthorized use. in this case,
After checking the cordless handset with the above-mentioned authentication code for the first time, generate a new authentication code again like the first time,
In addition, a plurality of personal identification codes are selected and sent to the child device, and a new authentication code is received from the child device and reconfirmed. Next in FIG.
6, the flow of signals exchanged from the call request to the link establishment between the base unit and the handset of the wireless telephone device shown in FIG. 15, which is an embodiment of the present invention, will be described. In the present example, an example is shown in which two personal identification codes are designated by the personal identification code selection unit. As shown in the figure, when the user presses the call button to make a call in the slave, first, a link establishment request for requesting the establishment of the link is output to the master. Upon receiving the link establishment request, the master unit outputs the selection numbers of the two secret codes determined by the secret code selecting unit and the authentication code generated by the authentication code generating unit to the slave unit. The slave unit encodes the sent two authentication codes designated by the selection code and the selection code by the combination encoding circuit, and outputs the generated authentication code to the master unit. The master unit determines whether the authentication code sent from the slave unit is correctly coded. If the authentication code is correctly coded, the link is established and the call mode is entered after specifying the call channel. . If the authentication code sent from the child device is not correctly encoded, the communication is rejected at that point and the link is not established. In the present embodiment, the first personal identification code stored in the personal identification code memory of each parent device is 11010001, the third personal identification code is 10101101, and the two personal identification codes designated by the personal identification code selection unit are stored. The code is the first PIN and the third PIN, and the authentication code is 0110110.
11. In addition, as an example of encoding, an example is shown in which three exclusive ORs of the authentication code and the two specified personal identification codes are taken as the authentication code. As shown in FIG. 16, the authentication code sent from the parent device is 01101011, and the personal identification code designated by the selection number is 11010001.
And 10101101, the authentication code correctly coded by combining the three is 00101111, and the child machine transmits this 00101111 to the parent machine as the authentication code.

By the operations of the above-described first to tenth embodiments, even if the ID code or the authentication code transmitted by the slave unit when making a communication request is intercepted, the risk of unauthorized use can be reduced. .

As described above, in the embodiment of the present invention, the master unit and the slave unit,
That is, although the application to a home cordless telephone has been described as an example, the present invention is applicable to a cellular telephone, a second-generation cordless telephone in which a household cordless telephone and a small zone system cellular telephone are combined. Of course, it is also available.

[0061]

As described above, according to the present invention, in order to confirm the second wireless device, in addition to the confirmation by the ID code,
The authentication code stored in both the first wireless device and the second wireless device is used, and the authentication code arbitrarily generated and transmitted in the first wireless device for each communication request from the second wireless device. Is transmitted to the first wireless device as an authentication code encoded by a predetermined method in combination with a personal identification code on the side of the second wireless device, and stored in the first wireless device as the transmitted authentication code. When it is determined that the received authentication code is correctly encoded based on the security code that is present and the second wireless device is confirmed, the second wireless device is permitted to make a call.

Therefore, at the time of the communication request from the second wireless device, the first wireless device does not need to send the personal identification code for confirming the second wireless device, and the communication request is made every time the communication request is made. Even if the randomly generated authentication code for confirming the second wireless device and the authentication code that changes accordingly are eavesdropped, the secret code is unlikely to be known, and the risk of unauthorized use can be greatly improved. Further, by regularly changing the personal identification code or combining a plurality of personal identification codes and authentication codes, it is possible to further improve the security against unauthorized use.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a wireless telephone device according to a first embodiment of the present invention.

FIG. 2 is a sequence diagram when making a call in the embodiment.

FIG. 3 is a configuration diagram of a wireless telephone device according to a second embodiment of the present invention.

FIG. 4 is a sequence diagram when a call is made in the embodiment.

FIG. 5 is a configuration diagram of a wireless telephone device according to a third embodiment of the present invention.

FIG. 6 is a configuration diagram of a wireless telephone device according to a fourth embodiment of the present invention.

FIG. 7 is a configuration diagram of a wireless telephone device according to a fifth embodiment of the present invention.

FIG. 8 is a sequence diagram when making a call in the embodiment.

FIG. 9 is a configuration diagram of a wireless telephone device according to a sixth embodiment of the present invention.

FIG. 10 is a configuration diagram of a wireless telephone device according to a seventh embodiment of the present invention.

FIG. 11 is a configuration diagram of a wireless telephone device according to an eighth embodiment of the present invention.

FIG. 12 is a sequence diagram when making a call in the embodiment.

FIG. 13 is a configuration diagram of a wireless telephone device according to a ninth embodiment of the present invention.

FIG. 14 is a sequence diagram when making a call in the embodiment.

FIG. 15 is a configuration diagram of a wireless telephone device according to a tenth embodiment of the present invention.

FIG. 16 is a sequence diagram when making a call in the embodiment.

FIG. 17 is a block diagram of a conventional wireless telephone device.

FIG. 18 is a sequence diagram when a call is made in the conventional example.

[Explanation of symbols]

18, 28, 34, 44, 50, 60, 64, 68, 7
5,82 Master device 19, 30, 35, 69 PIN code memory (master device side) 20 Authentication code generation unit 21 Authentication code memory 22, 77 Judgment circuit 24, 32, 40, 48, 55, 72, 79, 85
Handset 25,41,73 PIN code memory (slave side) 26,80 Encoding circuit 29 ID code memory 36 PIN code generator 37 Interface section (master side) 38,45 Connection detection section 42 Interface section ( Handset side) 47 Control section 52 Transmitting section 53 PIN code encryptor 56 Receiving section 58 PIN code decoder 61,65 Counter 62,66 Reset button 70,76 PIN code selecting section 83 Complex judgment circuit 86 Complex coding circuit

Claims (11)

[Claims] 1. A first wireless device connected to a communication network,
A wireless telephone device that communicates with at least one second wireless device using a wireless signal, wherein the second wireless device is an authentication code generated and output by the first wireless device, The authentication code encoded by a predetermined method is output based on the secret code stored in the second wireless device, and the first wireless device is configured to output the authentication code to the first wireless device.
Based on the secret code and the authentication code stored in the wireless device of, to determine the correctness of the encoding of the authentication code,
If it is determined that the authentication code is a correct encoding,
A wireless telephone device configured to permit the second wireless device to talk. 2. The first wireless device stores a personal identification code storage unit that stores a personal identification code, an authentication code generation unit that generates an appropriate authentication code, and an authentication code generated by the authentication code generation unit. An authentication code storage unit and an authentication code determination unit that determines whether the authentication code transmitted from the second wireless device is correct or not based on the secret code and the authentication code stored in the first wireless device. , Second
A personal identification code storage unit that stores the same personal identification code as the personal identification code stored in the first wireless device;
The secret code stored in the second wireless device and the first code
An encoding circuit that combines the authentication codes sent from the wireless device of the second embodiment and encodes them by a predetermined method to generate the authentication code, the first wireless device and the second wireless device.
The second wireless device outputs the authentication code encoded by performing the combination of the personal identification code and the authentication code at least once at the start of a call with the wireless device of the first wireless device. The wireless telephone device according to claim 1, wherein when the authentication code output from the second wireless device is determined to be an authentication code by correct encoding, the second wireless device is allowed to make a call. 3. An I for identifying to a first wireless device at least one second wireless device with which it has permitted communication.
An ID code storage unit that stores a D code, a personal identification code storage unit that stores a personal identification code corresponding to at least one of the identifiable second wireless devices that have permitted communication by themselves, and an appropriate authentication code The generated authentication code generator,
An authentication code storage unit that stores the authentication code generated by the authentication code generation unit, and an authentication code sent from the second wireless device based on the secret code and the authentication code stored in the first wireless device. An ID for identifying the second wireless device to the first wireless device to determine whether the first wireless device identifies itself.
An ID code storage unit that stores a code, a personal identification code storage unit that stores the same personal identification code as the personal identification code that is stored in the first wireless device and that is stored in the second wireless device. PIN code corresponding to and the first
An encoding circuit that combines the authentication codes sent from the wireless device of the second embodiment and encodes them by a predetermined method to generate the authentication code, the first wireless device and the second wireless device.
The second wireless device outputs the ID code stored in its own ID code storage unit, and the first wireless device outputs the second wireless device from the second wireless device. The second wireless device is identified based on the generated ID code, and further, the second wireless device performs the combination of the personal identification code and the authentication code at least once and encodes the authentication code. When the first wireless device determines that the authentication code output from the second wireless device is an authentication code based on correct encoding, the first wireless device permits the second wireless device to talk. The wireless telephone device according to claim 1. 4. A rewritable personal identification code storage unit that stores the same personal identification code, and a personal identification code stored in the personal identification code storage unit are transferred to both the first wireless device and the second wireless device. Input / output means, connection detection means for detecting mutual connection of the input / output means in at least one of the first wireless device and the second wireless device, and response to a signal from the connection detection means And a personal identification code generator that automatically generates a personal identification code.
When the input / output means of the wireless device are interconnected, the contents of the secret code storage units of the first wireless device and the second wireless device are transferred to the secret code generation unit via the input / output unit. The wireless telephone device according to claim 1, wherein the first wireless device identifies the second wireless device by rewriting the generated personal identification code and using the personal identification code. 5. A rewritable personal identification code storage unit that stores the same personal identification code, and a personal identification code stored in the personal identification code storage unit are transferred to both the first wireless device and the second wireless device. Input / output means, connection detecting means for detecting mutual connection of the input / output means, and a personal identification code for automatically generating a personal identification code in at least one of the first wireless device and the second wireless device. In response to the signal from the generation unit and the connection detection means, it is determined that the personal identification code sent via the input / output means is the same as the personal identification code stored in the personal identification code storage unit. In this case, the personal identification code generating unit is activated, and the content of the personal identification code storage unit of the first wireless device and the second wireless device is generated by the personal identification code generating unit via the input / output unit. Rewrite to code And a first control unit using the secret code rewritten by the control unit.
2. The wireless telephone device of claim 1, wherein said wireless device identifies said second wireless device. 6. A rewritable personal identification code storage unit that stores the same personal identification code is provided in both the first wireless device and the second wireless device, and the first wireless device and the second wireless device. At least one of the devices, a personal identification code generating unit that rewrites the personal identification code storage units of the first wireless device and the second wireless device to an automatically generated personal identification code, and a personal identification code generated by the personal identification code generating unit. And an encryption unit that encrypts the secret code storage unit according to a predetermined method by the secret code before rewriting, and a transmission that modulates the secret code encrypted by the encryption unit and outputs it as a radio signal. And a part of both the first wireless device and the second wireless device, or of the first wireless device and the second wireless device, the secret code generation unit and the encryption unit. And the transmitter For the person not provided, the receiving section for demodulating and extracting the personal identification code encrypted by the encryption section from the wireless signal, and the encrypted personal identification code retrieved by the receiving section for the personal identification code Decoding with the secret code before rewriting of the code storage unit, and a decoding unit for updating the secret code before rewriting of the secret code storage unit, and using the secret code updated by the decoding unit The wireless telephone device of claim 1, wherein the first wireless device identifies the second wireless device. 7. The number of times that the first wireless device determines that the wireless device is a fraudulent wireless device and refuses communication when confirming a personal identification code storage unit that stores a personal identification code and another wireless device that has made a communication request. And a input unit for inputting a reset signal for returning to a normal state when a communication refusal state is entered, and the number of refusals of communication counted by the counting unit is predetermined. When the number of times is reached, a reset signal is input from the input unit, communication requests from all other wireless devices are rejected until the count of the counting unit is cleared, and the request is stored in the first wireless device. The wireless telephone device according to claim 1, wherein the first wireless device identifies the second wireless device using a personal identification code. 8. An I for identifying to a first wireless device at least one second wireless device with which it has permitted communication.
There is a communication request, an ID code storage unit that stores a D code, a personal identification code storage unit that stores a personal identification code corresponding to at least one identifiable second wireless device that has permitted communication by itself. A counting unit that counts and stores the number of times the communication is rejected when it is determined as an unauthorized wireless device when checking other wireless devices for each second wireless device having an ID code for which communication is permitted; And an input means for inputting a reset signal for returning to a normal state when the number of the second wireless devices permitted to communicate counted by the counting unit is predetermined. When the number of times reached is reached, a reset signal is input from the input means, and a communication request from the second wireless device having a corresponding ID code is rejected until the count of the counting unit is cleared. Wireless telephone device according to 1. 9. A personal identification code storage unit for storing a plurality of personal identification codes in the first wireless device, and one personal identification code arbitrarily selected to specify which personal identification code is used for encoding. A selection unit, an authentication code generation unit for generating an appropriate authentication code, an authentication code storage unit for storing the authentication code generated by the authentication code generation unit, a personal identification code selected by the personal identification code selection unit, and the An authentication code determination unit that determines whether the encoding of the authentication code sent from the second wireless device is correct based on the authentication code stored in the authentication code storage unit. The personal identification code storage unit that stores the same personal identification code as the plurality of personal identification codes stored in the wireless device, and the personal identification code selection from the personal identification code stored in the second wireless device. The same personal identification code as the personal identification code selected by the selecting unit is selected, and the personal identification code and the authentication code sent from the first wireless device are combined, and the code is encoded by a predetermined method for each designated personal identification code. And an encoding circuit for generating the authentication code.
At the time of starting a call between the first wireless device and the second wireless device, the second wireless device performs the combination of the personal identification code and the authentication code at least once and encodes the authentication code. When the first wireless device determines that the authentication code output from the second wireless device is an authentication code obtained by correct encoding, the first wireless device permits the second wireless device to talk. The wireless telephone device according to claim 1. 10. A personal identification code storage unit for storing a plurality of personal identification codes, and at least one personal identification code arbitrarily selected in the first wireless device, and specifying which personal identification code is used for encoding. A code selecting section, an authentication code generating section for generating an appropriate authentication code, an authentication code storing section for storing the authentication code generated by the authentication code generating section, a secret code selected by the secret code selecting section, and An authentication code determination unit that determines whether or not the encoding of the authentication code sent from the second wireless device is correct based on the authentication code stored in the authentication code storage unit. The personal identification code storage unit that stores the same personal identification code as the plurality of personal identification codes stored in one wireless device; and the personal identification code stored in the second wireless device. The same personal identification code as all the personal identification codes selected by the personal identification code selection section is selected, and each of these personal identification codes and the identification code sent from the first wireless device are combined, and each designated personal identification code is preset. An encoding circuit for encoding the authentication code by a predetermined method to generate the authentication code, the first wireless device and the second wireless device.
The second wireless device outputs the authentication code encoded by performing the combination of the personal identification code and the authentication code at least once at the start of a call with the wireless device of the first wireless device. The wireless telephone device according to claim 1, wherein when the authentication code output from the second wireless device is determined to be an authentication code by correct encoding, the second wireless device is allowed to make a call. 11. A personal identification code storage unit for storing a plurality of personal identification codes, and at least one personal identification code arbitrarily selected in the first wireless device, and specifying which personal identification code is used for encoding. A code selection section, an authentication code generation section for generating an appropriate authentication code, an authentication code storage section for storing the authentication code generated by the authentication code generation section, and a personal identification code selected by the personal identification code selection section. And an authentication code determination unit that determines whether the authentication code transmitted from the second wireless device is correct, based on the authentication code stored in the authentication code storage unit. The secret code storage unit that stores the same secret code as the plurality of secret codes stored in the first wireless device and the secret code stored in the second wireless device. The same personal identification code as all the personal identification codes selected by the personal identification code selection unit is selected, and all of these personal identification codes and the authentication code sent from the first wireless device are combined, and a predetermined method is used. An encoding circuit that encodes the authentication code to generate the authentication code, and the second wireless device is configured to use a secret code and an authentication code when a call is started between the first wireless device and the second wireless device. And outputting the encoded authentication code by performing the combination at least once, and the first wireless device determines that the authentication code output from the second wireless device is an authentication code by correct encoding. The wireless telephone device according to claim 1, wherein when the determination is made, the second wireless device is permitted to make a call.