JPH0221739A - Outsider invasion prevention system in communication channel - Google Patents

Abstract

PURPOSE:To prevent invasion of an outsider other than a line contract party to a line, acquisition and forging of data, intercept entirely and disadvantages to the line contract party completely by making the data sent/received via a communication channel redundant based on a cardinal number changed timewise. CONSTITUTION:Remote controllers 13, 14 and a control unit 3 have a common cardinal number to make the data desired to be sent actually redundant depending on a function or a series of random number predetermined by a prescribed time series and the cardinal number is changed in response to the time series. The remote controllers 13, 14 and the control unit 3 have a clock generator, an encoder and a decoder generating a data string based on the cardinal number or decoding it respectively and decode the data string based on the cardinal number at that time. Thus, even with the cut and try by an outsider for lots of number of times, the invasion to the channel, understanding or forgery of content of data are disabled and disadvantage of locking of the equipment or the like is avoided to guard the advantage of the line contract party.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is a communication system or control system using a communication line, in which an outsider (backer) can prevent disadvantages due to line intrusion by an outsider (backer). Regarding methods for preventing intrusion by persons.

(Prior art) Conventionally, this type of intrusion prevention method has been based on the following: First, each transmitter/receiver station or line subscriber has a several-digit identification code (PIN number) in advance, and the There is a method in which communication and control transmission is enabled when both devices at each station confirm each other's recognition codes, thereby preventing intrusion by outsiders who do not have the recognition codes.

In addition, as a second method, if a device on the line is called by an outsider with an incorrect recognition code, it is determined that this is an access by an outsider and the functions of the device are locked. There are known methods for preventing disadvantageous acts by individuals.

(Problem M to be solved by the invention) According to the first method above, the recognition code always exists after several thousand to tens of thousands of trials and errors depending on the number of digits in the recognition code. If steps are taken to enable the line, transmissions over that line will become effective at some point over the course of a number of times. Also, once the transmission is enabled.

An outsider who recognizes that particular recognition code can, from then on,
This is extremely inconvenient because it is possible to easily interrupt the line and perform actions (such as control) that are disadvantageous to the line subscriber.

Along with this, it is possible to periodically change the recognition code, but the disadvantage is that the 5-line subscriber must always memorize the currently valid recognition code, which is extremely troublesome. .

Furthermore, in the second method described in Section 2, the device remains locked even when the single-line subscriber actually requires transmission, which has the disadvantage of interfering with communication and control.

The present invention was proposed in order to solve the various problems mentioned above, and its purpose is to prevent outsiders from intruding into the line, understanding the contents of data, tampering with it, etc. by repeated trial and error. is impossible.

Another object of the present invention is to provide a system for preventing intrusion by outsiders in a communication line, which eliminates inconveniences such as device locking and protects the interests of line subscribers.

(Means for Solving the Problems) In order to achieve the above object, a first invention is such that a transmitting station makes data redundant and transmits data based on a radix that changes over time, common to both transmitting and receiving stations. At the same time, the receiving station restores the received data based on the radix and processes the data as valid. Further, in the second invention, the eight transmitting stations transmit to the communication line a transmission code that identifies itself and changes over time in common to both the transmitting and receiving stations, and the receiving station identifies the transmitting station from the transmission code. If the transmitting station is confirmed, the received data is treated as valid. Furthermore, in a third invention, a transmitting station transmits a transmission code made by making a recognition code for identifying its own station redundant according to a certain rule to a communication line, and a receiving station transmits the transmission code by making the recognition code redundant according to a certain rule. When a specific transmission Jυ is confirmed from the recognition code restored based on the data, the data is processed as valid.

(Operation) According to the first invention, since the base number of redundant data transmitted and received via the communication line is clear between the transmitting and receiving stations, the receiving station restores the data based on this base number and provides a predetermined number. Performs processing such as control.

Furthermore, since the base number changes from time to time in a predetermined time series, it becomes impossible for an outsider to falsify data or understand the content of redundant data. By keeping the identification code owned by the line subscriber as is, changing the transmission code of the communication line over time, and making this transmission code constantly recognized at the transmitting and receiving stations, the transmission and reception (only 3 stations Send and receive data (g
Prevent outsiders from intruding into the line if possible. Furthermore, according to the third invention, since the transmission code on the communication line is a redundant identification code unique to each station, it is difficult for an outsider to detect the transmission code and infiltrate the line. It becomes difficult.

(Example) The present invention will be described in detail below with reference to the drawings.

First, FIGS. 1 and 2 show an embodiment in which the present invention is applied to a home control system.

ing.

In figure 1, 1 is for the subscriber of the line, and this subscriber 1 is equipped with an online control unit 3 connected to the subscribed line 2. It serves as a reception point for communications. In addition, 7 contractee's house 1 has a VTR 6 that can be controlled by communication, and a rice cooker 7. Bath 8. There is a door lock 9, a telephone 4, an answering machine 5, etc., which are each connected to the control unit 1-3. In addition, in FIG. 1, lO indicates an intercom/door phone.

In addition, the controller 1-roll unit 3 has two detachable remote controllers (hereinafter referred to as remote controllers) 1.
3.14 connections 13', 14' are provided.

These remote controllers 13 and 14 transmit various communication and control data etc. from the line telephones H and 12 connected to the contracted line 2 to the VTR6 when the line subscriber goes out, as shown in FIG. Set, rice cooker 7 ON, bath 8
The remote controller 13, 14 and the control unit 3 constitute a type of transmitting/receiving station that transmits and receives data via the contracted line 2. be. and,
The remote controllers 13.14 can be electrically connected to the control unit 3 via contacts 13', 14' by contacts or magnetic circuits. The control unit 3 sends and receives data using the method described below, thereby transmitting and receiving data from the contract port li! 2. Prevent outsiders from intruding into 2, as well as data eavesdropping and tampering.

First, in the first invention, the remote controllers 13, 14 and the control unit 3 operate according to a function, a sequence of random numbers, etc. that is predetermined according to a predetermined time sequence (clock).
The data that you actually want to send (including the recognition code to identify your own station) has a common base number for redundancy,
This base number changes depending on the time series. For example, as shown in Table 1 below, even when transmitting and receiving the same data, redundancy can occur due to changes in the time sequence and number base (an example of using a two-digit base). The contents of the data columns are different.

,, - (Hereinafter, blank spaces) Table 1 Here, the remote controllers 13 and 14 and the control unit 3 each include a clock generator, and an encoder and decoder for generating or decoding a data string based on the above-mentioned radix. Each is equipped with one remote control device when you are at home.
By connecting 3.14 to the control unit 3, the reference clocks are synchronized, and both stores a function or random number for determining the base number that changes from time to time according to the future time series. be done. Therefore, after such clock synchronization and functions are stored,
Even if the line subscriber goes out with the remote controller 13 or 14, the radix in any time series is
That is, the remote controllers 13, 14 side and the control unit 3 side will match, and the data related to the redundant data string exchanged between the two at that time will be uniformly specified.

5 When transmitting control data etc. to the control unit 3 using the remote controller 13 from outside the home, for example,
The remote controller 13 makes the data redundant and encodes it based on the radix at the time, and transmits the encoded data string via the contract line 2. The control unit 3 restores the data string based on the radix at the time and performs error checking and verification. After checking, it is decoded and various controls indicated by the data are performed.

As a result, for outsiders, the redundant base number that is the basis of the data string changes from moment to moment, making it impossible for outsiders to understand or tamper with the data, making it difficult for outsiders to intervene in contract line 2, and various equipment for contract sound 1. , the reliability of operations, communication control, etc. is improved, and it becomes possible to protect line subscribers from disadvantages caused by interference from outsiders as in the past. Furthermore, by connecting the intercom/door phone 10 to the control unit 3 on lines other than the contracted line 2, the remote controller 13.1 can be connected to the control unit 3 when the subscriber returns home.
4 can also be used to unlock the door lock 9.

Next, in the second invention, one of the remote controllers 13 and 14 and the control unit 3, which is the transmitting station, specifies its own station, and both the transmitting and receiving stations use a function or a sequence of numbers, such as random numbers, to The person who becomes the receiving station transmits the transmission code that changes to contract line 2 via the encoder,
It decodes the transmission code, which changes from moment to moment, confirms the destination station, and processes the received data.

That is, in this invention, for example, the recognition code that specifies the remote controller 13 as a transmitting station is kept unchanged and is used as a password to enable this remote controller @ 13, and the identification code that identifies the remote controller 13 as a transmitting station is used as a password to make the remote controller @ 13 usable. The transmission code (between units 3) is changed in a predetermined time sequence (clock) as shown in Table 2.

Table 2 These transmission codes are, for example, a time series function f (T
t ) =X xtX B

As a result, for example, although the transmission code that specifies the remote controller 13 changes over time, the control unit 3 side always recognizes this changing transmission code, so data transmission between the remote controller 13 and the control unit 3 is possible. becomes effective, and an outsider who cannot know the mode of change in the transmission code is unable to intervene in the contracted line 2.

Next, a third invention will be explained. In this invention, the transmitter of the remote controller 13, 14 and the control unit 3 makes the recognition code for identifying its own station redundant using an encoder according to a certain rule such as a function or a sequence of random numbers. When the receiving station generates a transmission code and transmits this transmission code to the contracted line 2, the receiving station confirms the specific transmitting station from the recognition code obtained by decoding the transmission code based on the function, etc. It processes the received data as valid. Incidentally, the above functions etc. are the same as in the first and second aspects of the invention.
4 and the control unit 3 are connected, the information is stored in both.

If the recognition code assigned to the remote controller 13 is a 3-digit code X, Transmission code X 2X2□X)Z
X42 X5□ is generated and sent to contract line 2.

On the other hand, control unit 3.

A three-digit recognition code X□1X, 1X1. The communication/control data transmitted from the remote controller 13 is validated on the condition that the two match. If the two do not match, it is determined that the access has been made by an outsider, and the data is invalidated.

In this case, it is possible to prevent the transmission code from being leaked to outsiders by changing the function etc. for generating the redundant transmission code over time, and even if the transmission code is changed in this way, , there is no need to change the recognition code between the user of the remote control device 13 and the remote control device 13.

According to this invention, as the number of digits in the transmission code increases, the range of code searches by outsiders increases dramatically.
The advantage is that it becomes difficult to learn the code and it becomes impossible to intervene in the contracted line 2.

Next, FIG. 3 shows a case where the present invention is applied to an information network system as another embodiment of the first to third inventions described above. This example is.

The information of the central contractor 100 is transferred to the child contractor 20.30.40
This is a system that many others use for a fee, and both of these serve as data transmitting and receiving stations. It should be noted that the number of sub-contractors is, of course, not limited.

In this example, regarding the first and second inventions,
A ROM (read only memory) card 300 with a built-in time series issued by the transmission device 102 with a built-in basic clock connected to the solid device 101 302, 303
．． Use 304. These ROM cards include the first
In addition to the time series shown in the table or Table 2, functions of periods approved by the central contractor 100 or sequences of random numbers are stored, and the base number and changing transmission code for a predetermined time series are stored in the transmission device. 102.

Therefore, the child contractor 20゜30 as the information demander,
40 is the solid device 10 by the child device 21.31.41 using its own ROM card 302.303.304.
It is possible to enable communication, control, etc. with 1.

In this case, the encoder and decoder are built into the transmission device 102 and slave devices 21, 31, and 41, respectively.

In this embodiment, when the contract for a certain period of time expires, the above functions, etc. become unknown, and the base number and transmission code also become unknown. The information of the person 100 becomes unavailable. Furthermore, it is essentially impossible for an outsider who does not have a predetermined ROM cart to infiltrate the line or obtain data.

Further, in the third invention, the transmission device 102 and the RO
M cards 300.302.303.304 have built-in functions for redundancy of transmission codes, and these R
Only the slave contractors 20, 30, and 40 who own the OM cards 302, 303, and 304 can use the information of the central contractor 100, thereby preventing outsiders from invading the line.

The present invention can be applied to the protection of line subscribers in various communication and control systems in addition to the home control system and information network system described above. It is also possible to combine the above inventions as appropriate; for example, by combining the first and second inventions, it is possible to make the data to be transmitted redundant based on the radix that changes over time,
At the same time, by changing the transmission code over time, it is possible to construct a communication and control system that is even safer for single-line subscribers.

(Effects of the Invention) As detailed above, according to the present invention, data sent and received via a communication line is made redundant based on the base number that changes over time, or the transmission code between the sending and receiving temperature is changed over time. By changing the transmission code or making the transmission code redundant, it becomes completely impossible for outsiders other than the line subscriber to infiltrate the line, obtain data, tamper with it, eavesdrop on it, etc. This has the effect of completely preventing any disadvantageous acts.

Furthermore, there is no inconvenience that the communication device or the like is locked when an outsider intervenes, unlike in the conventional case, so there is no possibility that necessary communication or control will be hindered.

[Brief explanation of the drawing]

1 and 2 are block diagrams of a home control system for explaining one embodiment of the present invention, and FIG. 33 is a block diagram of an information network system for explaining another embodiment of the present invention. . 1... Contract Otoden 2... Contract line 3...
Control unit 13.14...Remote controller 20.30.
40...Slave side contractor 21.31.41...Slave side device 100...Central contractor 101...Solid device 102...Transmission device

Claims (3)

[Claims] (1) In a communication/control system that performs communication and control by transmitting and receiving data between transmitting and receiving stations via a communication line, the transmitting station redundantly transmits the data based on a base number that changes over time common to both transmitting and receiving stations. 1. A system for preventing intrusion by outsiders in a communication line, characterized in that the receiving station restores the received data based on the radix and processes the data as valid data. (2) In a communication/control system that performs communication and control by transmitting and receiving data between transmitting and receiving stations via communication lines, the transmitting station identifies its own station and transmits data that changes over time in common to both transmitting and receiving stations. A system for preventing intrusion by outsiders in a communication line, characterized in that a code is transmitted to the communication line, and the receiving station processes the data as valid when it confirms the specific transmitting station from the transmission code. . (3) In a communication/control system that performs communication and control by transmitting and receiving data between transmitting and receiving stations via communication lines, the transmitting station has a redundant identification code for identifying its own station according to certain rules. A transmission code is transmitted to the communication line, and the receiving station processes the data as valid if the specific transmitting station is confirmed from the recognition code obtained by restoring the transmission code based on the rules. A method for preventing intrusion by outsiders in a communication line, which is characterized by: