JPH10327211A - Communication method and communication - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure high privacy through the use of the ciphering system and the compression encoding system of simple algorithm by transmitting information for specifying the work system of data to a communication opposite party through a communication network different from a communication network. SOLUTION: For executing telephone communication between a terminal 1 and a terminal 2 via internet, information on the internet protocol(IP) address of the self-terminal from one terminal and an encryption key are transmitted to the other terminal of the communication opposite party prior to telephone communication via internet. A terminal-side receiving information of the IP address and the encryption is connected to internet through an internet service provider(ISP) and obtains the self-IP address. Then, oscillation following the protocol of internet transmitting a call setting message containing the self-IP address and the received IP address of the communication opposite party is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication method and a communication terminal which are preferably applied to a communication system for performing communication through a communication network, such as the Internet, in which communication is performed through a network with low privacy. .

[0002]

2. Description of the Related Art The Internet is known as a worldwide computer network. The Internet is
It is a computer network that connects computer networks existing in companies and universities around the world via a wide area line, and is spread all over the world. Various services using the Internet, such as an electronic mail service, a file transfer service, and an information search service, have already been provided.

FIG. 12 shows an outline of the Internet. In FIG. 12, a portion NET surrounded by oblique lines
Reference numerals 101, NET102, NET103,... Are computer networks. These computer networks NET101, NET102, NET103,.
Has a plurality of terminals T, T, T,.
Each computer network NET101, NET10
The terminals T, T, T,... Of the NET 103 are connected to each other by a LAN (Local Area Network). As a form of the LAN, Ethernet, token ring, or the like is used.

[0004] Each computer network NET10
, NET102, NET103,... Are connected to each other via routers R101, R102, R103,. The routers R101, R102, R103,... Perform routing processing for delivering data on the computer network to the computer network according to the destination.

As described above, the computer network N
The ET101, NET102, NET103,... Are connected via routers R101, R102, R103,. Such a computer network is called the Internet. Through the Internet, computer networks NET101, NET1 around the world
02, NET103,... Can be transferred.

In the Internet, IP (Internet Protocol) is used as a protocol of a network layer.
col) is used. In the IP, an IP address is assigned to each terminal, and a destination to which the data is transferred is identified by the IP address. The IP address is formed by collecting four numbers that can be represented by 8 bits in a binary number, and is expressed as, for example, "43.3.25.24.6".

[0007] With the spread of the Internet, a shortage of IP addresses is feared. Therefore, when the number of terminals registered on a certain network is large and the number of terminals actually connected is small, etc., in order to save IP addresses, a server that allocates an IP address on the network is provided. Only when the device is connected,
There is a case where a vacant IP address is assigned. By doing so, it is not necessary to prepare IP addresses for the number of terminals, and a limited number of IP addresses can be used effectively.

In the Internet, TCP (Transmission) is used as a transport layer protocol.
Control Protocol) and UDP
(User Datagram Protocol) is used. TCP performs communication after performing a so-called connection-type communication connection, and has a function of performing packet order control, retransmission, flow control, and congestion control. UDP is a connectionless protocol.
It is used in place of TCP when real-time properties are required. For example, in digital voice communication and the like, even if a part of a packet is dropped, retransmission of the packet is not requested, and voice is transmitted without interruption. In the case of such voice communication, UDP is used.

As described above, the Internet basically uses the TCP / IP protocol. That is, an IP address is assigned to a terminal of the computer network, and this IP address is used for identifying the terminal. Then, the packet is transferred by TCP or UDP.

[0010] However, personal computers are not always connected to a LAN and may not have an IP address. Therefore, when an individual participates in the Internet, a company called an Internet service provider is used. When an Internet service provider (hereinafter referred to as ISP) is used, a personal computer can be connected to a telephone line using, for example, PPP.
(Point to Point Protocol)
And SLIP (Serial Line IP) to connect to a computer network and to participate in the Internet.

FIG. 13 is a diagram for explaining an example of the ISP. ISP's computer network NET1
51 has a server S151 and a router R151. The server S151 includes a plurality of modems M151, M
, Public telephone network TEL through 152, M153,...
151.

The terminals T151, T152, T153,...
Is a terminal of a person who individually participates in the Internet.
The terminals T151, T152, T153,... Are connected to a public telephone network TEL151 via a modem (not shown). Personal terminals T151, T152, T153, ...
For example, a personal computer having a serial port can be used.

When participating in the Internet using an ISP, a contract is generally made between the user and the ISP company in advance. When a contract is signed between the user and the ISP, an account name and a password are sent to the user.

Personal terminals T151, T152, T15
When joining the Internet from 3,..., The user dials the ISP and calls the ISP's computer network NET151. Upon receiving the call, the server S151 requests input of an account name and a password, and authenticates whether a contract has been made with the ISP.

If it is verified that the entered account name and password are correct and that a contract has been made with the ISP, the server S151 searches for a free IP address and finds a free IP address. For example, by using this IP address as a temporary IP address, terminals T151, T152, T153,
Assign to ... Thereby, terminals T151 and T15
2. A temporary IP address is assigned to T153, ...
Be able to connect to the Internet.

In the example described above, the PPP connection is made using a telephone line. However, ISDN (Integral) is used.
ted Service Digital Network
rk) may be used. ISDN64 is 1
Two 64 kbps B channels on the line, 16 kb
One D channel of ps is composed of three channels in total. By transmitting IP packets on the B-channel and the platform using ISDN, it can be used as a 64 kbps line. That is, since there are two B channels, I
In the SDN, two telephone lines can be used substantially independently by one telephone line contract.

[0017]

Since the Internet described above can be basically used free of charge, for example, in the case of an Internet telephone for making a telephone call using the Internet, a charge generated by a contract with the ISP and an ISP Telecommunications via the Internet can be used for a variety of purposes, such as making calls using only telephone charges up to and using ISDN, and making long-distance or international calls at extremely low rates. It has been used in.

However, the Internet is a so-called open network, and has a problem that the confidentiality of communication data is low. Therefore, when attempting to perform highly confidential communication through the Internet, usually, communication information for securing the confidentiality or data compression information between the communication terminals attempting to perform the highly confidential communication is usually determined in advance. After that, measures have been taken such that communication is performed based on the encrypted information and the like.

[0019] However, even if this measure is used, if this cipher information or the like is transmitted over the Internet, it is possible to receive the cipher information or the like by a terminal other than a communication terminal that attempts to perform highly confidential communication. Therefore, once the encryption information or the like is decrypted, the secrecy cannot be maintained.

For this reason, in general, in order to secure the secrecy, it is necessary to use an encryption system or a compression encoding system having a high-level algorithm which is difficult to decipher, and it is not easy to obtain a high level of secrecy. Was.

The present invention has been made in view of the above points, and provides a communication method and a communication terminal capable of securing a high degree of secrecy even when using an encryption method or a compression coding method with a simple algorithm. Aim.

[0022]

In order to solve the above problems, according to the first aspect of the present invention, processed data is
In a communication method for transmitting or receiving through a first communication network, a second communication method different from the communication network.
The information for specifying the data processing method is transmitted to a communication partner through a communication network.

According to the first aspect of the present invention, a highly confidential communication network can be used as the second communication network, and data such as an encryption method is transmitted through the highly confidential second communication network. Information for specifying the processing method, for example, encryption information, can be sent with high secrecy. Further, since information for specifying the data processing method is transmitted through the second communication network, the processing method can be easily changed. Therefore, a higher degree of secrecy can be secured by a processing method using a simple algorithm.

Further, in the communication method according to the second aspect of the present invention, prior to performing communication of the processed data through the first communication network, one side of a sender or a receiver of the data communication is used. And transmitting information for specifying a data processing method to the other side.

According to the second aspect of the present invention, information for specifying a data processing method through the second communication network is transmitted prior to data communication through the first communication network. Therefore, prior to the data communication, the data processing method is specified between the communicating parties based on the information for specifying the data processing method. For this reason, the first communication network can be provided from the side that transmitted the data for characterizing the data processing method and the side that received the data while securing high secrecy as in claim 1. Of processing data can be transmitted through the server.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a communication method according to the present invention will be described below with reference to the drawings for a case where end-to-end communication (communication between terminals) is performed between individuals via the Internet.

As described above, in communication via the Internet, a data transfer destination is identified by an IP address. However, a terminal of a user who has contracted with the ISP and participates in the Internet by PPP is temporarily assigned an IP address only when requesting a connection, and is not always connected. For this reason, if the other party who normally makes a PPP connection using the ISP does not have a PPP connection at present, even if an attempt is made to make a call with a user terminal that is participating in the Internet via PPP as the other party, a call must be made in advance. Since the IP address of the partner is not known, the partner cannot be called directly.

On the other hand, LAN terminals that exist in companies and universities that are not directly connected to the Internet through the ISP but are directly connected to the Internet are basically assigned IP addresses. Since it is always running, it can be called using an IP address.

However, even in such a LAN terminal, in order to save the IP address, a server for allocating the IP address is provided on the network, and a vacant IP address is allocated only when the terminal is actually connected. (DHCP; Dynamic Ho
st Configuration Protocol
l) There are cases. Even in the case of a LAN terminal that exists in a company or a university, if a terminal to which an IP address is temporarily assigned is used as a destination, the IP address is not uniquely determined. Can not know in advance and can not call a specific destination.

In order to solve this problem, there is a service, such as a so-called rendezvous server, which provides an IP address of a destination required for communication. That is, a person who receives this service turns on his / her computer and logs in to the server. And
When the server requests a list of logged-in persons, a list of service contractors currently logged in is sent to the server. The service contractor selects a party to which he or she wants to talk from the list and notifies the server. Then, the server provides the IP address of the selected partner, and by using this IP address, the end-to-end (P
PP).

However, using this service has the following disadvantages. In other words, when attempting to communicate via the Internet using this service, the two communicating parties must turn on their own computers and register with a service server such as the rendezvous server described above. Otherwise, communication is not possible. If the computer is turned off after being on the list, the computer terminal will not be automatically deleted from the list. It does not mean that communication connection is possible. A server usage fee is required. Since the login information to the server, that is, its own IP address is substantially disclosed, privacy cannot be maintained. In addition, unnecessary incoming calls from terminals other than the terminal with which communication is desired due to being published on the list occur. When the server is down, communication is not possible. There is an inconvenience.

The present invention is basically not related to the above-mentioned IP address problem. However, in the embodiment described below, in particular, in a case where communication between individuals via an ISP is also enabled, in this example, an example of a telephone via the Internet will be described as an application. I do. In addition, data processing is encryption, and an example will be described in which information for this encryption, in this example, an encryption key is transmitted as information for specifying a data processing method.

FIG. 1 shows an outline of a communication network configuration to which the communication method according to this embodiment is applied.
In FIG. 1, a communication terminal 1 and a communication terminal 2 are personal computers, each having an application capable of performing telephone communication through the Internet as software.

In the case of this embodiment, the telephone lines 3, 3 to which the terminal 1 and the terminal 2 are connected are ISDN lines, and as described above, the communication line capacity of two lines that can be used independently. Is substantially provided. The exchange SW1 is
This is for performing telephone exchange with the terminal 1. The exchange SW2 is for performing telephone exchange for the terminal 2.

The ISP-A is an Internet service provider to which the user of the terminal 1 has subscribed. Also,
ISP-B is an Internet service provider to which the user of the terminal 2 has subscribed. These ISP-A,
The ISP-B is a terminal adapter (TA) and a server, respectively, and not shown in FIG.
3 is included.

The exchange SWA is for performing telephone exchange for the ISP-A, and the exchange SWB is for the ISP-A.
-B for telephone exchange. ISP
-A and ISP-B are connected to the Internet 4.

Switch SW1, SW2, SWA, SWB
Is a switch of a so-called ISDN public line network. Therefore, for example, the terminal 1 can make the terminal 2, the ISP-A, or the ISP-B receive the call and perform communication by a calling operation using a normal telephone number.

However, as described above, in order for the terminal 1 to perform the end-to-end communication with the terminal 2 via the Internet 4, the terminal 1 must acquire the IP address of the terminal 2 in advance. . Then, if the IP address of the partner terminal is known, the ISP-A
→ Internet 4 → End via ISP-B-
End communication can be performed.

Next, the configuration of the communication terminals 1 and 2 will be described. In this embodiment, the communication terminal 1 and the communication terminal 2 have exactly the same configuration. FIG. 2 is a block diagram showing the configuration of the communication terminal according to this embodiment.

As described above, the communication terminal of this embodiment is constituted by a personal computer.
For the system bus 10, a control unit 11, a data processing unit 12, a voice processing unit 13, a key switch unit 14,
The display unit 15, the ISDN interface unit 16, the handset unit 17, the switch circuit 18, and the ringer generation unit 19 are connected to each other.

The control section 11 controls the entire terminal. The control unit 11 cooperates with the data processing unit 12 to perform necessary data processing such as protocol processing for data transmitted via the Internet and processing for generating data to be transmitted via the Internet. Execute

In the case of telephone communication via the Internet, the voice processing unit 13 compresses voice data to be transmitted and expands received voice data because voice data is compressed and transmitted. Do.

The key switch section 14 includes dial keys and other key switches. The control unit 11 recognizes which key has been operated, and the control unit 11 executes control corresponding thereto. In this embodiment, the key switch section 14 is provided with a response key. This response key is operated when the incoming call is for transmission of an IP address prior to communication via the Internet. When this response key is operated, unlike a normal off-hook operation, the terminal sends a disconnection message to disconnect the line.

The display unit 15 displays a telephone number entered by a key at the time of calling, a calling number (other party telephone number) included in the calling terminal information and a receiving number received at the time of receiving a call from the ISDN network. The terminal displays information necessary for communication. The information required for the receiving terminal to communicate is I
P address, encryption information, and the like. Further, in this embodiment, as will be described later, a display indicating that the other party has accepted the communication through the Internet is also displayed on the display unit 15.

The ISDN interface unit 16 is connected to the line 3 and, in this example, enables 2B + D (two B channels and one D channel) communication.

The handset unit 17 includes a switch circuit 18
D / A conversion of the received digital audio data obtained from the D / A conversion to an analog audio signal, and output to the speaker 17S,
Also, the audio signal input from the microphone 17M is A
/ D conversion and output to the switch circuit 18.

The switch circuit 18 is controlled to be switched by the control unit 11, and is switched to the a side in the case of a normal ISDN telephone and to the d side in the case of a telephone via the Internet.

The ringer generating section 19 generates a ringer (bell sound) to notify the receiving user of the incoming call.

When this terminal operates as an ISDN telephone, the operation is as follows. That is, at this time, the switch circuit 18 is switched to the illustrated state a. Then, the digital audio data received by the ISDN interface unit 16 is supplied to the handset unit 17 through the switch circuit 18, is subjected to D / A conversion, is supplied to the speaker 17S, and is output as a received voice.

The transmission voice signal input from the microphone 17M is A / D converted by the handset unit 17 into digital voice data, and is converted into digital voice data through the switch circuit 18 and the ISDN interface unit 16.
It is transmitted to the SDN line 3.

Next, when the terminal performs a telephone communication operation via the Internet, the operation is as follows. That is,
At this time, the switch circuit 18 is switched to the side b, which is a state opposite to the state shown in the figure. The voice data received by the ISDN interface unit 16 from the ISDN line 3 via the Internet is transmitted to the control unit 11.
And is delivered to the audio processing unit 13. The voice processing unit 13 expands the received data and delivers the data to the handset unit 17 through the switch circuit 18. The handset unit 17 performs D / A conversion and outputs the received voice through the speaker 17S.

The transmission voice signal input from the microphone 17M is A / D converted by the handset unit 17 into digital voice data, delivered to the voice processing unit 13 through the switch circuit 18, compressed, and converted into digital data. 11
Handed over to The control unit 11 converts the received voice data into a data string to be transmitted in cooperation with the data processing unit 12 in accordance with a telephone application protocol on the Internet.
6 to the ISDN line 3.

[First Embodiment of Communication Method] The operation of telephone communication via the Internet using the terminals 1 and 2 having the above-described configuration will be described below.

In this embodiment, for example, the terminal 1
When performing telephone communication via the Internet between the terminal and the terminal 2, prior to the telephone communication via the Internet, one terminal transmits the IP address of its own terminal and information on the encryption key to the communication partner. To the other terminal.

Then, the terminal that has received the IP address and the information of the encryption key connects to the Internet through the ISP and acquires its own IP address. And
This own IP address and the IP address of the communication partner
An outgoing call according to the Internet protocol for transmitting a call setup message including an address is performed. This allows
The two terminals are connected via the Internet, and communication becomes possible. Then, the data is encrypted with an encryption algorithm that can be decrypted using the received encryption key, and data communication is performed with each other.

Next, some examples of communication modes of the communication method according to this embodiment will be described. In the following description, prior to telephone communication via the Internet, the side that sends its own IP address to the other terminal by ISDN telephone is a calling terminal,
The side that acquires this IP address will be referred to as the terminating terminal.

In the first communication mode, for example, when telephone communication is performed between the terminal 1 and the terminal 2 via the Internet, the terminal 1 is connected to the Internet via the ISP prior to the telephone communication via the Internet. From one terminal that has obtained an IP address, by using an ISDN telephone using a line different from the line connected to the ISP, the information of the IP address and the encryption key is transmitted to the other terminal of the communication partner. Send.

FIG. 3 shows an example of the first communication mode.
FIG. 4 is a diagram showing a sequence of ISDN telephone communication for transmitting an IP address prior to telephone communication via the Internet, FIG. 4 is a flowchart of a processing operation on the calling terminal side at that time, and FIG. It is a flowchart of the processing operation of the receiving terminal side. The following example is a case where the transmitting terminal is the terminal 1 and the receiving terminal is the terminal 2.

First, a sequence of ISDN telephone communication prior to telephone communication via the Internet in this embodiment will be described with reference to FIGS.

The ISDN telephone communication is performed by a route of terminal 1-switch SW1-switch SW2-terminal 2 as shown by a dotted line 5 in FIG. In addition, communication via the Internet is performed by a terminal 1-switch SW1-switch SWA-ISP-A-Internet 4-ISP-B- as shown by a dotted line 6 in FIG.
This is performed by the route of the exchange SWB-the exchange SW2-the terminal 2.

Prior to this sequence, terminal 1, which is the originating terminal, accesses ISP-A using one ISDN line and is connected to the Internet.
It gets the address and stores it in a buffer. Then, the operator (sender) of the terminal 1 performs a process of transmitting an IP address to the terminal 2 using the other ISDN line while connected to the Internet.

That is, as shown in FIG. 3A, the operator (caller) of the terminal 2 performs an off-hook operation and also performs a call operation for inputting the telephone number of the terminal 2. Then, it is determined in step S1 of FIG. 4 and the process proceeds to step S2. In step S2, it is determined whether or not the terminal is currently connected to the Internet. If not, the process proceeds to step S3, and the call including the caller ID is performed as in a normal ISDN telephone. Sends a setting message. Then, thereafter, the process proceeds to step S4,
A normal telephone call processing routine is performed.

If it is determined in step S2 that the terminal is connected to the Internet, the flow advances to step S5 to transmit a call setting message including the acquired own IP address and information on the encryption key. In this case, the information of the IP address and the encryption key is sent as the user information included in the call setup message.

User The user information is about 128 bytes. In this embodiment, in addition to the information of the IP address and the encryption key, the name of the sender is transmitted at the same time. The information for characterizing the processing method may include not only the encryption key but also an application coding method such as a voice compression coding method and a coding algorithm. When the receiving terminal is configured to include application software, information specifying an application to be used may be transmitted.

When the call setup message is transmitted from the terminal 1 in this way, as shown in FIG. 3A, the call setup message is sent to the terminal 2 as a terminating terminal through the exchanges 1 and 2, and the exchange 1 , A call setting acceptance message is sent to the calling terminal 1. Then, as shown in FIG. 5, the receiving terminal 2 detects that the call setting message has been received in step S21 and detects the incoming call, proceeds to the next step S22, generates a ringing tone, and receives the incoming call. In addition to notifying the user of the incoming call, a call message indicating that a ring tone has been generated is transmitted (see FIG. 3B).

Then, in the receiving terminal 2, in step S23
To display the information of the calling terminal on the display unit 15 thereof. That is, when the caller number is displayed on the display section 15 and the IP address, the encryption key and the caller name are included in the call setting message, the IP address, the encryption information and the caller name are displayed. Is also displayed. If the call setting message also includes an application, a display indicating that the application is being sent is also displayed. The display on the display unit 15 allows the user to determine whether the incoming call is a normal incoming call or an incoming call for notification specifying a prior IP address or data processing method for communication via the Internet. .

The call message sent from the receiving terminal 2 is sent to the calling terminal 1 through the exchange 2 and the exchange 1 as shown in FIG. 3B. The originating terminal 1 performs step S6
When the call message is received, the flow advances to step S7 to confirm that the ringing tone is being transmitted from the receiving terminal 2.
The information is displayed on the display unit 15.

On the other hand, the called party checks the contents displayed on the display unit 15 of the terminal 2 and determines whether or not to respond to this call. In the receiving terminal 2, the called party determines in step S24 whether or not a response operation, for example, a response key operation has been performed.
The routine proceeds to step 25, where a normal response processing routine is performed.

When the called party operates the answer key, it is detected in step S24, and the process proceeds to step S26, where the IP address, the encryption key and the application information in the call setup message are stored in the memory, and then the process proceeds to step S27. To send a disconnect message.

This disconnect message is sent to originating terminal 1 through exchange 2 and exchange 1 as shown in FIG. 3C. The transmitting terminal 1 detects this disconnection message in step S8 of FIG.
Display of disconnection. Also, the display unit 15 displays that the communication via the Internet designated by the caller has been accepted by the callee.

Next, the calling terminal 1 proceeds to step S10, and sends a release message. This release message is sent to the terminating terminal 2 through the exchanges 1 and 2. When the receiving terminal 2 detects this release message in step S28, it proceeds to step S29, sends a release completion message, and ends this routine. When the calling terminal 1 detects that the release completion message has been received in step S11, the calling terminal ends the calling processing routine.

Thus, the IP address of the terminal 1 currently connected to the Internet on one line is transmitted to the terminal 2 on another line. Then, the terminal 2 receiving the IP address performs a process of connecting to the Internet, and executes its own IP address.
After acquiring the address, the connection processing is performed by designating the partner terminal using the received IP address, and an end-end communication request designating the terminal 1 is issued.
It is possible to perform communication via the Internet between the terminal and the terminal 2.

In this state, since both the transmitting terminal 1 and the receiving terminal 2 specify and recognize the encryption method which is the data processing method by using the encryption key, the specified encryption method is used. Encrypt data and execute mutual data communication. As described above, when the application such as the encryption algorithm and the compression encoding method or its designation information has been sent to the receiving terminal in advance, the data is received or designated at the time of this data communication. The data is processed by the selected application, and the data communication is performed.

At this time, necessary information, such as an IP address, stored in the memory of the terminal 2 is read and used. Further, it is also possible to configure so that an end-end communication request specifying the terminal 1 is made by an application by, for example, performing a specific key operation on the receiving terminal 2 side.

That is, the figure will be further described.
After the above-described sequences of FIGS. 3A, 3B, and 3C, the communication between the terminal 1 and the terminal 2 via the Internet is performed by executing the sequences of D to H as illustrated in FIGS. . The sequence of D to H will be described with reference to FIG. The sequences in FIGS. 7D to 7F and 7H are sequences for calling and connecting from the communication terminal to the ISP, and are the same as the normal ISDN calling and receiving call sequence.

First, the receiving terminal 2 that has acquired the IP address
The operator (recipient) of the user makes a telephone connection to the ISP-B with which he or she has subscribed using the ISDN line in order to connect to the Internet 4. That is, as shown in FIG. 7D,
The terminal 2 goes off-hook and makes a call using the ISP-B as the receiving terminal. Then, a call setup message is sent from the terminal 2 to the ISP-B through the exchange SW2 and the exchange SWB. Upon receiving the call setup message, the ISP-B generates a ringing tone and sends out a calling message as shown in FIG. 7E. The terminal 2 receives the call message and displays a call.

When the ISP-B goes off-hook in response to the ringing tone, the response message is displayed as shown in FIG.
As shown in F, it is sent to the terminal 2 through the exchange SWB and the exchange SW2, and the terminal 2 stops displaying the call.
At this time, the response confirmation message from the exchange SWB is IS
Sent to P-B. As described above, the terminal 2 can be connected to the Internet through the ISP-B.

During the communication shown in FIG. 7G, the connection to the ISP is confirmed using the information channel (this procedure is exactly the same as the conventional procedure). Terminal 1 received from terminal 2
A connection request is made using the IP address of the terminal 1, and telephone communication with the terminal 1 and the terminal 2 via the Internet is performed.

FIG. 8 is a diagram showing a connection sequence for communication via the Internet. This connection sequence is executed, and assuming that a call is being made between the terminal 1 and the terminal 2 as a telephone application via the Internet,
Secret communication of the above-described target information is performed. If a disconnection instruction is issued from one of the terminals, the communication is released and the communication line is terminated as shown in FIG.
Then, to end the communication with the ISP-B at the terminal 2,
The sequence of FIG. 7H is executed.

As described above, from the terminal 1 connected to the Internet, the IP address is transmitted to the terminal 2 through another line, and the terminal 2 receiving the IP address connects to the Internet, and connects the terminal 1 with the communication partner. By performing communication using a telephone application via the Internet, communication via the Internet can be performed directly between the terminal 1 and the terminal 2 without requiring a service such as a rendezvous server. it can.

Prior to communication via the Internet, in addition to the IP address, information such as an encryption key and an application for specifying a method of processing data for securing confidentiality is received from the transmitting terminal 1. Since the data is transmitted to the terminal 2 and the data is encrypted by the encryption method or the voice compression coding method specified by the encryption key or the like, and the data is compressed and coded, mutual data communication is performed. Can be secured.

In addition, the encryption key and the information of the application for specifying the method of processing the data for securing the secrecy are transmitted together with the transmission of the IP address prior to the data communication and at the time of communication via the Internet. So that every time you communicate via the Internet,
It is easy to change the encryption key and the application, and a high level of secrecy can be ensured even if the encryption method or the compression encoding method is a simple algorithm.

In the above embodiment, whether or not to transmit an IP address or the like in a call setup message is determined depending on whether or not the calling terminal is connected to the Internet. The key switch unit 14 is provided with a key switch for instructing a call to be made by including an address and an encryption key in the call setting message, and only when the key switch is operated, the IP address, the encryption key, and the like. May be placed in the call setting message.

In the above description, the incoming user is I
Communication via the Internet is performed using the terminal that has acquired the P address and the encryption key. However, since the IP address and the encryption key are displayed on the display unit 15, the incoming user who recorded or memorized the IP address and the encryption key was recorded. However, of course, communication via the Internet can be performed using a communication terminal different from the receiving terminal 2.

[Second Embodiment of Communication Method] Next, a second embodiment of the communication method according to the present invention will be described. In the second embodiment described below, after confirming that the operator of the terminal 1 and the operator of the terminal 2 make a call and perform communication via the Internet, one of the terminals connects to the Internet. After the connection, the obtained IP address and information such as the encryption key and the application are transmitted to the other terminal through, for example, an ISDN network.
The other terminal that has obtained the address connects to the Internet in the same manner as in the above-described embodiment, and then,
The highly confidential communication via the Internet shown in FIG. 8 is performed.

In the above-described first embodiment, the terminal 1 is connected to the Internet in advance and transmits the IP address to the terminal 2 by ISDN telephone communication. In the embodiment, it is not necessary that one line of any terminal is connected to the Internet in advance.

FIG. 9 shows a sequence diagram in the case of the second embodiment. In FIG. 9, A to C are exactly the same as the sequence until the called party answers in the case of a normal ISDN telephone.

FIGS. 9A and 9B are the same as FIGS. 3A and 3B, but the terminal 1 does not need to be connected to the Internet as described above.
It does not include IP address or application information.

Then, in the case of the second embodiment, as shown in FIG. 9C ^* , the terminal 2 responds by going off-hook according to the ringing tone. Then, a response message is sent from the receiving terminal 2 to the exchange SW2, and a response confirmation message is returned to the terminal 2 from the exchange SW2. And
At this time, the response message is sent to the originating terminal 1 by the exchange SW1.
, The calling terminal 1 stops displaying the call. As a result, the terminal 1 and the terminal 2 are connected by the route indicated by the dotted line 5 in FIG.

In the second embodiment, during the call, the caller confirms that the communication between the caller and the callee is performed via the Internet. And
At that time, for example, by discussion, the terminal 1 sends the IP address, the encryption key, and the information of the application,
It is negotiated to request the terminal 2 to make a connection request for communication via the Internet. Then, in accordance with this agreement, in this example, the terminal 1 performs processing for connecting to the Internet through another line, and acquires the IP address of the terminal 1.

The operator of the terminal 1 issues a transmission request to transmit the obtained IP address, encryption key, and application information of the terminal to the terminal 2 through the line during the call. This transmission request is made by, for example, pressing a transmission terminal information transmission request key which is predetermined as one key of the key switch unit 14 of the terminal shown in FIG.

When the terminal 1 detects that the calling terminal information transmission request key has been pressed, the terminal 1 obtains the acquired I information in accordance with a software program registered in the control unit 11 in advance.
Transmission terminal information including a P address, a caller name, an encryption key, application information, and the like is transmitted to the terminal 2 as a user information message. In this case, the user information message is transmitted in the format of the user user information described above (see FIG. 9K).

Upon receiving the user information message, the receiving terminal 2 receives the information of the receiving transmitting terminal, that is, the IP address.
The address, the caller's name, and the application information are displayed on the display unit 15, and these information are stored in the memory. The called party confirms the acquisition of the IP address, the encryption information, and the like from this display, and performs an on-hook operation to disconnect the line. Thereby, as shown in FIG. 9L, the disconnection message is transmitted to the terminal 1 through the exchange SW2 and the exchange SW1, and the disconnection is displayed on the display unit 15 of the terminal 1 side. Then, a release message is sent from the terminal 1 to the terminal 2 through the exchanges SW1 and SW2, and the terminal 2 receiving the message transmits a release completion message to the terminal 1 through the exchanges SW2 and SW1, thereby releasing the busy line. .

Thereafter, from the terminal 2 which has obtained the IP address and the encryption key, etc., the confidentiality via the Internet is performed in the same sequence as that shown in FIGS. 7D to 7H of the first embodiment. High communication,
This is performed between the terminal 2 and the terminal 1.

[Third Embodiment of Communication Method] Each of the above embodiments is a case of communication between personal computer terminals, but the present invention is also applicable to a remote control communication system. .

For example, a remote monitoring communication system will be described as an example of the remote control communication system. In this case, the monitoring center as a remote control center issues a communication request to a monitoring device terminal having a monitoring camera or a monitoring sensor as a remote control terminal, and a video captured by the camera from the monitoring device terminal. The monitoring center receives information and sensor output information. In this embodiment, the monitoring center and the monitoring device terminal are both ISDN
Connected to line.

FIG. 10 is a flowchart showing the operation flow of the monitoring center in this remote monitoring system. FIG. 11 is a flowchart showing the flow of the operation of the monitoring device terminal.

The monitoring center starts with step S31
In step S32, a process for connecting to the Internet using one of the ISDN lines is performed.
Get P address. Then, in step S33, a telephone call is made to the monitoring device terminal through another ISDN line through the ISDN network, and its own IP address, encryption information, application information, and the like are included. The transmitting terminal information is included in the user information in the call setup message and transmitted.

When the monitoring device terminal detects a call setting message by calling from the monitoring center in step S41, it proceeds to step S42, generates a ringing tone, and sends out the calling message. Then, in the next step S43, the caller terminal information included in the call setting message is analyzed and confirmed. In step S44, a caller number (calling number) indicating a monitoring center registered in advance in the monitoring device terminal.
Is determined. If it is determined that the incoming call is not from the monitoring center, the process proceeds to step S45, and no response is made. And step S
As a result of the determination in 44, when it is determined that the incoming call is from the monitoring center, the process proceeds to step S46, and an automatic response is made. By judging whether or not the monitoring center is based on the calling number, the security of the automatic response is ensured.

After the automatic response, in the next step S47, I
Stores P address, encryption key and application information. Then, in step S48, a disconnection message is transmitted in the same manner as in the case of FIG. 3C.

The monitoring center receives the disconnection message in step S34, sends a release message in the same manner as shown in FIG. 3 and waits for a release completion message from the monitoring device terminal. Release the line connected to the terminal. On the other hand, the monitoring device terminal receives the release message from the monitoring center, sends out a release completion message, and releases the line.

Next, in step S49, the monitoring device terminal performs processing for connecting to the Internet, and in the next step S49.
In step 50, a communication request for telephone communication with the monitoring center via the Internet is issued using the acquired IP address of the monitoring center, and in the next step S51, video information and sensor information to be sent from the monitoring device terminal are transmitted to the designated encryption key. And sends it to the monitoring center via the Internet using a compression and coding application. Then, when it is confirmed in step S52 that the transmission has been completed, the process proceeds to step S53 to perform processing for releasing the line connected to the Internet.

On the other hand, the monitoring center determines in step S35
Responds to a connection request from the monitoring device terminal via the Internet, and receives and decodes information sent from the monitoring device terminal in the next step S36. And
If it is detected in the next step S37 that the reception has been completed, a release process of the line connected to the Internet is performed in the next step S38.

In this way, a highly confidential remote control communication system via the Internet can be realized. In this case, information can be transmitted with high confidentiality by communication through the Internet.
Even if the distance between the monitoring center and the monitoring device terminal is relatively long and the amount of information to be transmitted is large, inexpensive communication can be performed. It can be expected that the range of use of the remote control service will be expanded. In addition, since information can be transmitted with high secrecy by communication through the Internet, the problem of privacy protection can be solved.

In the example shown in FIG. 11, the security of the automatic response is performed based on the calling number. However, a predetermined password is included in the information at the time of calling such as a call setting message from the monitoring center. The security can be ensured by automatically responding only when the password is detected by the monitoring device terminal.

[Other Modifications] In the above embodiment, I
Since the P address was not known in advance,
Although the data communication via the Internet is originated from the receiving terminal having acquired the address, the present invention
In the case of performing data communication between a company and a university connected to a LAN to which an IP address is permanently assigned in advance, communication originating from the Internet is transmitted from an originating terminal that transmits an encryption key or an application. Even if you go from
Of course it is good.

It is not necessary to carry out information on the encryption key and the compression / encoding prior to communication via the Internet. That is, the sender who transmitted the encrypted and compression-encoded data to the other party via the Internet,
An encryption key for decrypting the encryption and information of an application for decompressing the compression may be transmitted to the other party after the data communication through the ISDN network which is another network.

In the above, a case has been described in which communication is performed using two communication networks, the Internet and an ISDN network, using an ISDN line, but the present invention is not limited to the type of communication line. For example, analog telephone lines,
A wireless communication line, a CATV (cable television) network, or the like can be applied as long as it can connect to a plurality of partners. However, according to the present invention, the first communication network for processing and communicating data has a low communication cost, but has low secrecy and a second communication network for transmitting information for specifying a data processing method. Communication networks are more beneficial when privacy is high.

[0109] Also, as an example of the communication application, a telephone via the Internet has been described, but the present invention is not limited to the type of application and communication network.

Further, the configuration of the terminal does not need to be an integral type as shown in FIG. 2, and the communication interface unit may have another configuration like an external modem.

The method of transmitting information such as IP address, encryption key information, and application is not limited to the above-described method of transmitting a call setting message or a user information message. For example, in the case of an analog telephone line, transmission may be performed using a dial tone, or data may be transmitted using a modem. Also,
The transmission may be performed using the subaddress of the ISDN line. Further, information on the application and the name of the caller may be registered in advance in association with the caller number, and the pre-registered information may be read from the caller number and used as transmission information.

[0112]

As described above, according to the present invention, even when data is transmitted / received through a network with low secrecy, data processed by a simple algorithm is transmitted while securing a high secrecy. be able to.

Further, even in a communication method in which address information on a network of a communication partner required for connection of communication is not known in advance, it is possible to secure confidentiality without using a service such as a rendezvous server and pass through the network. End-to-end communication can be performed directly.

[Brief description of the drawings]

FIG. 1 is a network configuration diagram for explaining an outline of an embodiment of a communication method according to the present invention.

FIG. 2 is a block diagram of an example of a communication terminal used in the embodiment of the communication method according to the present invention.

FIG. 3 is a diagram showing a communication sequence prior to communication via a network in the embodiment of the communication method according to the present invention.

FIG. 4 is a flowchart of the operation on the transmitting side in the sequence of FIG. 3;

FIG. 5 is a flowchart of the operation on the receiving side in the sequence of FIG. 3;

FIG. 6 is a diagram for explaining the entire sequence of the communication method according to the first embodiment of the present invention.

FIG. 7 is a diagram for explaining a sequence of communication via a network in the communication method according to the first embodiment of the present invention.

FIG. 8 is a diagram showing a sequence of telephone communication via the Internet.

FIG. 9 is a diagram for explaining the entire sequence of the communication method according to the second embodiment of the present invention.

FIG. 10 is a flowchart showing an operation flow on one communication terminal side of the third embodiment of the communication method according to the present invention.

FIG. 11 is a flowchart showing an operation flow on the other communication terminal side in the third embodiment of the communication method according to the present invention.

FIG. 12 is a diagram for explaining the Internet.

FIG. 13 is a diagram for explaining an Internet service provider.

[Explanation of symbols]

Reference numerals 1 and 2: communication terminal, 3: ISDN line, 4: Internet, 11: control unit, 13: voice processing unit, 14: key switch unit, 15: display unit, 16: ISDN interface unit, 17: handset unit, 18 ... switch circuit,
19: Ringer generator, SW1, SW2, SWA, SW
B: exchange, ISP: Internet service provider, ISP-A, ISP-B: Internet service provider

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI H04M 3/00 H04L 9/00 685 11/00 303 13/00 303B

Claims (28)

[Claims] 1. A communication method for transmitting or receiving processed data through a first communication network, wherein the processing method specifies a data processing method through a second communication network different from the communication network. A communication method comprising transmitting information to a communication partner. 2. The communication method according to claim 1, wherein, prior to performing communication of the processed data through the first communication network, the data is transmitted from one of a sender side and a receiver side of the data communication. A communication method, characterized by transmitting information for specifying the processing method to the other side. 3. The communication method according to claim 1, wherein a sender of the data communication through the first communication network communicates with the second communication network to specify a data processing method. A communication method of transmitting a message to a receiver. 4. The method according to claim 1, wherein:
The communication method according to claim 1, wherein the second communication network is a highly confidential network. 5. The method according to claim 1, wherein the information for specifying the data processing method is transmitted as user user information included in the call setup message using an ISDN network. The communication method according to claim 3. 6. The communication method according to claim 1, wherein the information for specifying the data processing method is data communication information over a telephone line using a modem. A communication method characterized in that the communication is performed as a communication. 7. The communication method according to claim 1, wherein the information for specifying a data processing method is ISD.
A communication method characterized by performing communication using information of a subaddress using an N network. 8. The communication method according to claim 1, 2, 3, or 4, wherein the information for specifying the data processing method is transmitted using a dial tone. Characteristic communication method. 9. The communication method according to claim 1, 2, 3, or 4, wherein the information for specifying the data processing method is transmitted to the other party before transmitting the information. A communication method comprising making a call including calling terminal information to a called party, and automatically answering the called party of the communication in accordance with the calling terminal information included in the received calling information. 10. The communication method according to claim 1, 2, 3, or 4, wherein the information for specifying the data processing method is transmitted to the other party prior to transmitting the information. Making a call to the other party including a password as the calling terminal information, wherein the other party of the communication automatically answers according to the password as the calling terminal information included in the received calling information. Communication method. 11. The communication method according to claim 1, 2, 3, or 4, wherein the transmission of the information for specifying the data processing method includes:
A communication method, which is executed after confirming communication by a call with the other party. 12. The processing of data transmitted through the first communication network is data encryption, and the information for specifying a processing method of the data transmitted through the second communication network includes: 5. The information for specifying encryption processing as data processing, wherein the information is information for specifying encryption processing as data processing.
Communication method described in. 13. The processing of data transmitted through the first communication network is compression of data, and the information for specifying a processing method of the data transmitted through the second communication network includes the data 5. The communication method according to claim 1, wherein the information is information for specifying a compression process as a processing of the data. 14. A communication terminal capable of communicating at least through first and second communication networks and transmitting or receiving processed data through said first communication network, wherein said communication terminal transmits and receives processed data through said second communication network. A communication terminal including means for transmitting at least information for specifying a data processing method to a communication partner. 15. A communication terminal capable of communicating through at least first and second communication networks and transmitting or receiving processed data through the first communication network, wherein the communication terminal transmits and receives processed data through the second communication network. Will be sent,
Means for acquiring at least information for specifying a processing method of the data, wherein the first communication is performed by processing data using a processing method specified by the information for specifying the obtained processing method. A communication terminal for transmitting, via a network, information for specifying a data processing method to a partner terminal that has transmitted the information. 16. The communication system according to claim 1, wherein:
The communication terminal according to claim 14, wherein the second communication network has a high level of secrecy. 17. The communication terminal according to claim 15, further comprising: means for notifying a user of information for specifying the acquired processing method. 18. The communication terminal according to claim 14, wherein said means for transmitting at least the information for specifying the data processing method to a communication partner includes a telephone call with the communication partner. 2. A communication terminal according to claim 1, wherein the communication terminal performs the transmission. 19. The information according to claim 14, wherein the information for specifying the data processing method is transmitted as user user information included in the call setup message using an ISDN network. A communication terminal according to claim 1. 20. The communication terminal according to claim 14, wherein the information for specifying the data processing method is communicated as data communication information over a telephone line using a modem. . 21. The information processing apparatus according to claim 14, wherein the information for specifying the data processing method is communicated by using information of a subaddress using an ISDN network. Communication terminal. 22. The communication terminal according to claim 14, wherein the information for specifying the data processing method is transmitted using a dial tone. 23. The communication terminal according to claim 15, wherein the calling terminal information included in the calling information received at the time of the incoming call is compared with the calling terminal information registered in advance, and an automatic response is made according to the comparison result. A communication terminal comprising automatic response means. 24. The communication terminal according to claim 14, wherein, prior to transmitting information for specifying the data processing method to the communication partner, a call including a password to the communication partner. A communication terminal comprising: 25. The communication terminal according to claim 15, further comprising automatic response means for decrypting a password contained in the call information received at the time of the incoming call and automatically responding when the password is successfully decrypted. 26. The communication method according to claim 1, wherein the first communication network is connected to a communication terminal when the communication terminal is connected to the communication network. The address of the communication terminal is dynamically assigned, and prior to communication through the first communication network,
Through the second communication network, information including an address of the own communication terminal on the first communication network is transmitted to a communication partner, and the communication partner transmits the information via the second communication network. A communication method, characterized by executing communication through the communication network by sending a communication request through the first communication network using the acquired address. 27. The communication terminal according to claim 14, wherein: a means for acquiring its own address on the first communication network by making a connection request to the first communication network; Means for transmitting the acquired address on the first communication network to the other party of communication through the second communication network; and responding to a communication request from the other party of the communication through the first communication network. And a means for performing the inter-terminal communication. 28. The communication terminal according to claim 15, wherein: a means for acquiring its own address on the first communication network by making a connection request to the first communication network; Means for obtaining information including the address of the other party on the communication network transmitted through the second communication network; and specifying the obtained address as the address of the other terminal, and communicating through the first communication network. Means for making a request and performing information communication between the terminals through the first communication network.