JPH0394540A - Specific terminal control method - Google Patents

Abstract

PURPOSE:To attain the control only when a message is received from a genuine specific terminal equipment by ciphering a data to be sent to a communication processing unit by the specific terminal equipment and adding an identifier to the ciphered data as a message form to send it to the communication processing unit. CONSTITUTION:A public telephone set TE ciphers a monetary amount (depositted traffic unit) depositted by coins or a card by a caller user, sets the result to a data part X of a message A and sends required charging information to an automatic exchange EX while being included in the message A. The automatic exchange EX discriminates the presence of the charging information in the message A from a charging information identifier and decodes the data part X in the message A by using a decoding key. When the decoded result is decoded by the automatic exchange EX, the automatic exchange EX generates a message B and sets charging information of 'containing command (charge contained by the public telephone set TE at once)' therein and sends the result to the public telephone set TE.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention connects a communication processing device and a specific terminal via a digital line, and sends a message requesting instructions from the specific terminal to the communication processing device. , a communication processing device relates to a specific terminal control method in which the specific terminal is caused to perform a predetermined operation by creating and sending a message giving instructions accordingly. [Prior Art] In a digital communication network, when a line connected to a communication processing device is shared by multiple terminals, it is difficult to identify which terminal is located only from the location where the line is accommodated in the communication processing device. Do not share the line with devices that cannot
A mixture of terminals and terminals that can be identified only from the line accommodation position in the communication processing device are accommodated in the communication processing device.

For example, in a packet switching network, the line between a packet multiplexer and a packet switch is shared by packets from the packet multiplexer and packets from general terminals accommodated in the packet multiplexer. , it is not possible to identify where a packet originated from only by looking at the line accommodation location in the packet switch.

In addition, when a digital telephone network adopts an interface as an ISDN user network interface, one line belonging to the interface may be shared by multiple terminals (for example, telephone terminals, fax terminals, packet terminals, etc.). It is now possible.

For terminals that do not share lines and can be identified only from the line accommodation position in the communication processing device,
Since it is a very ordinary terminal, there is no need for any special explanation.

When a message is transferred to a communication processing device from a type of terminal that cannot be identified only from the line accommodation position in the communication processing device, conventionally, the message or terminal is attached to the message to be transferred. The communication processing device identifies the message or terminal based on the identifier.

For example, in a packet switching network, when a failure occurs in a packet multiplexing device, the details of the failure and the identifier of the packet multiplexing device are transmitted as a message to the packet switching device, and the switching device that receives this sends instructions to deal with the failure. , is transmitted to the packet multiplexing device identified by the identifier.

In addition, in a digital telephone network, a public telephone, which is one of multiple terminals belonging to one interface, adds an identifier to, for example, billing data and sends it as a message to a digital exchange, and the exchange that receives this message responds accordingly. Instructions (for example, bill collection) are sent to the public telephone in the form of a message using the identifier. [Problem to be Solved by the Invention] As described above, it is possible to detect a message from a specific terminal of a type that cannot be identified only from the line accommodation position in the communication processing device based on the identifier attached to the message. In the conventional method of identifying and processing a message at a communication processing device, a general terminal that can be identified only from the line accommodation position in the communication processing device pretends to be a specific terminal of the type described above and sends messages using the same identifier. When the data is sent to the communication processing device, the communication processing device cannot tell the difference and misidentifies the general terminal as the above-mentioned specific terminal. There has been a problem in that various inconveniences occur because it is possible to perform processing that is only allowed for specific terminals.

An object of the present invention is to solve this problem, so that even if a general terminal disguises itself as a specific terminal and sends a message to a communication processing device using an identifier used by the specific terminal, the communication processing device Only when a genuine message is received from a specific terminal without misidentifying a general terminal as a specific terminal, the system creates a corresponding message and sends it to the specific terminal to control it. The purpose of the present invention is to provide a method for controlling a specific terminal that enables the following.

[Means to solve the problem]

To achieve the above object, the present invention connects a communication processing device and a specific terminal via a digital line, and sends a message requesting instructions from the specific terminal to the communication processing device.
In the specified terminal control method, the communication processing device creates and sends a message giving an instruction in response to the specified terminal to cause the specified terminal to perform a predetermined operation, wherein the specified terminal transmits data to be sent to the communication processing device. After encrypting the data, we attached an identifier to the encrypted data and sent it to the communication processing device in the form of a message.

[Effect]

A communication processing device that receives encrypted data with an identifier attached in the form of a message from a specific terminal checks whether or not the received data has an identifier attached, and if so, encrypts the data. When an attempt is made to decode received data that is supposed to be encoded data, and a predetermined pattern is obtained as a result, the identifier is assumed to be valid and a message corresponding to the received message is decoded, and decoding becomes impossible. If a predetermined pattern cannot be obtained even after decoding, the identifier is invalidated and a message corresponding to the received message is not created.

In this manner, in the communication processing device, even if a general terminal pretends to be a specific terminal and sends a message to the communication processing device using an identifier, the communication processing device can detect this fact.

〔Example) An embodiment of the present invention will be described below.

Here, we will take as an example a case where a public telephone, which is one of multiple terminals belonging to one interface in a digital telephone network, exchanges billing-related data with an exchange. This explanation assumes that this is done in accordance with the procedures specified in the signaling system. FIG. 1 is a sequence diagram showing one embodiment of the present invention, and FIG. 2 is an explanatory diagram showing an example of the structure of messages used at that time.

In these figures, TE represents a public telephone terminal and EX represents an automatic exchange. Further, the D channel is one channel used by users for signal transfer on the ISDN user network interface.

First, a data encryption method and an encryption/decryption key are determined in advance between the automatic exchange EX and the public telephone terminal TE.

The public telephone terminal TE encrypts the amount of money (insertion frequency) inserted by the calling user in coins or cards, and sets it in the data part X of the message A having the structure shown in FIG. 2(a). When the calling user finishes dialing the number of the other party, the message A includes necessary billing information and is sent to the automatic exchange EX.

In message A in Figure 2 (a), "call number" is the communication number assigned to the communication that the public telephone terminal TE is about to perform, and "call setup" is the name of the message. The ``calling number'' is the number assigned to the line, and the ``terminating number'' is the called number.

When the automatic exchange EX receives the message A, it indexes the subscriber data using the "calling number" and authenticates that the terminal TE is registered in the automatic exchange mEX as a public telephone.

The automatic exchange EX determines the presence or absence of billing information in the message A from the billing information identifier, and decrypts the data part X in the message A using the decryption key. If the decryption result can be decoded by the automatic exchange EX, the automatic exchange
creates a message B as shown in FIG. 2(b), sets "collection instruction (charge to be collected at once by public telephone terminal TE)" as billing information in it, and sends it to public telephone terminal T.
Send to E. In message B, "response" is also the name of the message.

When the automatic exchange EX cannot decipher the decoding result of the data part Send to that terminal.

When the public telephone terminal TE receives message B from the automatic exchange EX, it collects communication charges according to the "collection instructions" set in the message, encrypts the result, and creates message B' (see Figure 2). It is set in the data section Y of (C)) and sent to the automatic exchange EX.

When automatic exchange EX, receives message B',
The data part Y is decoded, and the decryption result is sent to message B first.
Verify whether it matches the "storage instructions" specified in . If the verification result matches the "storage instruction," the originating and terminating users are connected to enable communication.

If the decoding result cannot be understood by the automatic exchange EXO side, or if it does not match the "accommodation instruction" previously instructed in message B, a disconnection message is sent to that terminal and the communication is terminated.

After the automatic exchange EX receives message B゜, if the communication does not end before the expiration of the first billing cycle (calculated using the distance-based time difference method), it sends message C that sets the "collection instruction" necessary for the next billing as billing information. and sends it to the public telephone terminal TE.

Upon receiving the message C, the public telephone terminal TE performs the same processing as when it previously received the message B, and sends a message C° similar to the previous message B' to the automatic exchange EX.

When the automatic exchange EX receives the message C°, it performs the same processing as when it previously received the message B'.

Thereafter, messages C/C' are repeatedly sent and received between the public telephone terminal TE and the automatic exchange EX at every billing cycle until the originating/terminating user ends the communication.

Note that the encryption/decryption technology may be implemented using existing technology such as FEAL (Japanese encryption standard) or DBS (American data encryption standard).

Through the above steps, the data as billing information sent from the public telephone terminal TE to the automatic exchange EX is encrypted,
This makes it possible to identify public telephone terminals TE and verify billing information.

〔Effect of the invention〕

As explained above, according to the present invention, even if a general terminal pretends to be a specific terminal and sends a message to a communication processing device using an identifier, the data in the message is not encrypted, so the communication Even if the processing device tries to decrypt it, it cannot be done, and as a result, it has the advantage of being able to see through fraudulent messages from general terminals, and preventing unauthorized operations from being mistaken for general terminals as specific terminals. .

[Brief explanation of drawings]

FIG. 1 is a sequence diagram showing one embodiment of the present invention, and FIG. 2 is an explanatory diagram showing an example of the structure of a message used at that time. Explanation of symbols

Claims (1)

[Claims] 1) A communication processing device and a specific terminal are connected via a digital line, and the specific terminal sends a message requesting an instruction to the communication processing device, and the communication processing device responds to the instruction. In the specific terminal control method, the specific terminal is configured to cause the specific terminal to execute a predetermined operation by creating and sending a message to be sent, the specific terminal encrypting data included in the message to be sent to the communication processing device, In that encrypted data,
The message is sent to the communication processing device with an identifier attached thereto, and the communication processing device checks whether or not the data included in the received message is attached with an identifier. When an attempt is made to decrypt the data, which is supposed to be encrypted data, and a predetermined pattern is obtained as a result, the identifier is considered valid and a message is sent that gives the above instructions in response to the received message. is created and sent to the specific terminal, and if the identifier cannot be decoded or if a predetermined pattern cannot be obtained even after decoding, the identifier is considered invalid and a message giving an instruction is not created. A specific terminal control method.