JPH02202739A - Method and device for preventing tapping of digital radio system - Google Patents

Abstract

PURPOSE:To prevent tapping executed by a stolen radio equipment and to improve the privacy property of a system by providing an ID number registering/storage circuit, a data converter, etc., on a base station, and also, providing a data converter, etc., on a mobile machine. CONSTITUTION:When an ID number of a stolen machine is inputted to an ID number registering/storage circuit 14 in a base station, a radio wave brought into GMSK modulation is sent out to a mobile machine through a data converter 13 and a data transmitter 11. Subsequently, when the ID number and a data erasion end signal are received from the moving machine by a receiver 12, its data is compared with data stored in the circuit 14, and in the case they coincide with each other, they are displayed on a display circuit 15, and also, the data registered in the circuit 14 is reset. Also, in the mobile machine, in the case an individual selecting signal and a data erasion signals are received by a receiver 17, they are detected through a data converter 18, and after confirming the coincidence of its own ID number and a selective calling number, data contained in a RAM 20 is erased and an erasion signal is transmitted to the base station. In such a way, tapping can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a wiretapping prevention method and device for a digital radio system that prevents wiretapping by stolen radios.

BACKGROUND OF THE INVENTION In recent years, the demand for ensuring privacy in wireless communications has rapidly increased. However, no matter how high-class confidential communication functions are provided, in the event of theft, the above-mentioned configuration alone cannot prevent eavesdropping, so conventional means for preventing this have been proposed.

FIG. 1 shows a conventional method of erasing data stored in the RAM of a mobile device.

1 is a base station radio, λ is a controller for voice communication and data communication with a mobile device, and 3 is a mobile device (transceiver or receiver).

Next, the operation of the above conventional example will be explained.

In FIG. 1, when erasing the data stored in the RAM of the mobile device 3, by pressing the data erase signal sending button on the controller 2, the base station radio 1 sends out an individual selection paging signal and a data erase signal for the mobile device. be done. The mobile device that receives this signal compares the selective call signal with the data stored in the ROM, and if they match, erases the data for setting the secret code in the RAM and destroys the communication function of the mobile device.

Problems to be Solved by the Invention However, with such conventional methods, a signal is sent only when the operator presses a button, which is cumbersome to operate, and it is difficult to determine whether or not the data on the mobile device has actually been erased. This was problematic because the operator could not confirm it.

Means for Solving the Problems The present invention provides, in a digital wireless system, when a certain mobile device is stolen, the ID number of the stolen mobile device is registered in a base station storage circuit, and the same mobile device ID number is received. Then, the base station automatically transmits a data erasure signal for the stolen mobile device at regular intervals, and when the stolen mobile device receives the signal, it erases the data in the memory circuit, eliminates its function as a radio, and prevents reception by a third party. / The stolen mobile device automatically transmits a data erasure completion signal to the base station to enable confirmation at the base station. and an ID number registration/storage circuit, the mobile device is configured with a data converter and a RAM, the ID number of the stolen mobile device is registered in the ID number registration/storage circuit of the base radio, and the memo IJ-data is Accordingly, the data converter circuit outputs to the transmitter a signal consisting of an individual selection call signal and a data erase signal added, and the transmitter uses this signal to perform the GMS
A K-modulated signal is sent to a mobile device by radio waves, and when the mobile device receives an individual selection signal and a data erasure signal, the received signal is guided to the data converter and detected, and its own ID number and selective call are sent. After confirming that the numbers match, the data stored in the RAM is erased, and when the erasure is completed, the data converter transmits an ID signal and an erasure completion signal to the base station radio, and transmits the data to the base station radio. The station radio receives the ID number and the data erasure signal and guides it to the data converter circuit for detection;
The data is compared with the data in the ID number registration/storage circuit, and if they match, it is displayed on the display circuit and the data registered in the ID number registration/storage circuit is reset.

Effects The present invention has the following effects due to the above-described configuration.

In other words, once the operator registers the stolen device, the device will automatically erase data until the stolen device no longer functions as a communication device, and the base station will further confirm that the purpose has been achieved. I can do it.

Embodiment FIG. 1 shows a block diagram of an embodiment of the eavesdropping prevention method and device for a digital wireless system according to the present invention.

In the present invention, when a base station operator registers the ID number of a stolen mobile device in a controller, the device automatically performs individual selection and transmits a data deletion signal at regular intervals, and furthermore, the mobile device can erase data. When actually executed, the mobile device automatically transmits an erasure completion signal to the base station and displays it on the display of the controller so that the operator can confirm it.

A method for preventing wiretapping in a digital wireless system according to the present invention and a configuration of the device will be explained.

In FIG. 1, a keyboard 7 and a CRT display 6
When you register the ID number of the stolen machine using
is sent to the mobile device, Go.

Mobile device 3 receives the erase signal, checks it with the ID number built into the ROM, and if it matches, destroys the data stored in R, AM, L, and then sends the erase completion signal back to the base station using radio waves. Zuro. When the base station receives this erasure completion signal, it displays the ID number and data erasure completion on the display.

FIG. 2 shows an outline block circuit system diagram of the base station shown in FIG. 2(a) and the mobile station shown in FIG. 2(b).

At the base station, the ID number of the stolen machine is input into the ID number registration/storage circuit.

According to this memory data, the data converter circuit of /3 outputs a signal consisting of an individual selection call signal and a data erasing signal to the transmitter of //, and the transmitter of // is GMSK modulated by this signal. , sends a signal to the mobile device using two radio waves.

Next, when the receiver No. 12 receives the ID number and data erasure completion signal from the mobile device, the signal is led to the data converter circuit No. 73, and is compared with the data in the XD number storage circuit No. 1 to Detection 1 to /lI- (- 2. Match (if 7, /
,! ' is displayed on the display circuit. At the same time, the data registered in the ID number registration e storage circuit is reset.

In the mobile device, when the individual selection signal and the data erasure signal are received by the receiver No. 17, the signals are guided to the /f data converter and detected. Confirm that your ID number and selective call number match 1 to 1. ! Of
') Erase the data stored in RAM.

When the erasure is completed, the data converter at / sends an ID signal and an erasure completion signal to the 16 transmitters, and the transmitters transmit the radio waves to the base station.

Effects of the Invention According to the above configuration of the present invention, once the operator registers the data in the base station data storage circuit, the equipment automatically stores the data during idle periods, that is, while the wireless line is idle. In addition to repeating the task of erasing data as many times as necessary, the operator can confirm when the purpose of data erasure has been achieved.This is useful in system design, such as in security-related systems that use digital wireless systems that require confidentiality. Produces excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an embodiment of the eavesdropping prevention method for a digital wireless system according to the present invention, and FIG. 2(a) shows a base station,
The (+)) figure shows a schematic diagram of each system block circuit of a mobile device, and FIG. 3 shows a conventional system diagram. /: base station radio, 22 controller, 3: mobile device, 4f-: selective call/data erase signal, j
: ID/erasure end signal, 4: CRT display, 7: Keyboard, //, /6: Transmitter, /2, /7:
Receiving section, /3.7g: Data converter, /44: ID number registration [phase] storage circuit, /j': Display circuit, l: AF circuit 1.20SRAM.

Claims (1)

[Claims] 1. In a digital wireless system, if a certain mobile device is stolen, the ID number of the stolen mobile device is registered in the base station storage circuit, the same mobile device ID number is received, and the base station The station automatically sends a data deletion signal to the stolen mobile device at regular intervals, and when the stolen mobile device receives the signal, it erases the data in its memory circuit, eliminates its function as a radio, and prevents reception/transmission by a third party. 1. A method for preventing theft of a digital wireless system, characterized in that the stolen mobile device automatically transmits a data erasure completion signal to the base station, thereby making it possible for the stolen mobile device to confirm the data erasure at the base station. 2. Consisting of a base station radio and a mobile device, the base radio device consisting of a data converter and an ID number registration/storage circuit, and the mobile device consisting of a data converter and a RAM;
The ID number of the stolen mobile device is registered in the ID number registration/storage circuit of the base radio, and based on the memory data, the data converter circuit outputs a signal consisting of an individual selection call signal and a data deletion signal to the transmitter. The transmitter modulates the GMSK signal with this signal and sends the signal to the mobile device using radio waves. When the mobile device receives the individual selection signal and the data erasure signal, it guides the received signal to the data converter and detects it. After confirming that the ID number and selective call number match, the data stored in the RAM is erased, and when the erasure is completed, the data converter sends the ID signal and erasure completion signal to the base station radio. Radio waves propagate, and the base station radio transmits I
The D number and the data erasure signal are received, guided to the data converter circuit, detected, compared with the data in the ID number registration/storage circuit, and if they match, displayed on the display circuit, and sent to the ID number registration/storage circuit. A wiretapping prevention device for a digital wireless system, characterized in that it is configured to reset registered data.