JP2001148743A - Position information service system, position information using method of position information service system, originating terminal, position center, and terminating terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a position information service system which makes the ID of an originating terminal secret to the outside of a switching network, provides information at a request from a terminating terminal not restricted to a special number and charges the terminal, and prevents position information from being altered and data from illegally being reused. SOLUTION: The originating terminal holds the position information and sends it to a terminating terminal after one-time ciphering and the terminating terminal requests a position center to decipher the ciphered position information and obtains the deciphering result from the position center. The switching network in substitute for the position center charges the terminating terminal for the deciphering request to the position center.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a location information service system for notifying a called terminal (or a receiving terminal) of a location of a calling terminal (or a calling terminal) such as a public telephone. The present invention relates to a technology for securing service system security.

[0002]

2. Description of the Related Art Hitherto, as a service for providing location information such as the address of a caller to a callee, a call place introduction service has been proposed for a callee having a special telephone number such as a police or fire line (particularly). Kaihei 08-204835). In this service, the center obtains location information using the telephone number or terminal ID of the calling terminal of the caller, and provides the callee with the location information.

[0003] Japanese Patent Application Laid-Open No. 08-204841 discloses a public telephone location information system in which a caller can use a public telephone to notify his / her current location to the other party and the caller himself can obtain current location information. Have been. In this system, a caller transmits the telephone number and identification code of a public telephone to a base station (center), and the base station searches for location information based on the information transmitted from the caller, and receives the search result as a receiving station. Send to Examples of location information include location names,
A map display is included.

[0004] In addition, by using the caller ID notification service started in recent years, it is possible to know the caller's telephone number even outside the switching network, so that the telephone number and location information related to the telephone number can be obtained. A database or the like that associates the information with the sender can be constructed to provide the location information of the caller.

[0005] On the other hand, in order to smoothly operate the location information service, it is considered that not only the user can provide appropriate information desired by the user, but also an appropriate service charge is generally required. Further, in order to appropriately charge a service fee, information security technology such as improvement of confidentiality of information related to a service and prevention of falsification of information becomes important.

[0006] As a charging method for a location information service in the prior art, for example, according to the invention described in Japanese Patent Application Laid-Open No. 10-326075, a digital public telephone compatible with an IC card is used, and a store or the like around the public telephone is used. In the method of providing a destination guidance service, a call charge when dialing a service center from a public telephone is settled from an IC card or cash.

[0007]

As can be seen from the above description of the prior art, if the terminal ID of the caller's calling terminal, for example, the telephone number can be known, the location information database indexed by the telephone number is used. By constructing, it is possible to provide location information on the installation location of the calling terminal regardless of inside or outside the switching network. However, the phone number of the calling terminal is generally information that cannot be known by the called party unless the caller ID notification service is used, and in fact, many subscriber terminals keep the phone number private or private. Exists. Furthermore, the telephone number is kept secret from the public telephone.

Further, when the service provider constructs the location information database using the telephone number as an index, the service user stores the pair of the telephone number and the location information at the time of using the service, so that the location information database of the service provider is stored. It is possible to build a subset. In this case, the service user can obtain the location information for the same telephone number as the telephone number that used the service once without receiving the service from the service provider. Can not be charged Therefore, the service provider
It is desirable not to use the telephone number of the calling terminal to search for location information. Accordingly, an object of the present invention is to provide a location information service system for notifying a receiving terminal of the installation location of a calling terminal while maintaining the confidentiality of the calling terminal's telephone number.

A further object of the present invention is to provide a location information service system in which a service charge is prevented from being charged to a callee when the callee does not want to use the service.

A further object of the present invention is to prevent "position spoofing" so that a service is not provided when a calling terminal uses location information of another calling terminal in place of another calling terminal.

Another object of the present invention is to provide a location information use method, a transmitting terminal, a location center, and a receiving terminal in the location information service system.

[0012]

According to the present invention, in order to achieve the above object, there are proposed a technique of transmitting position information itself by encrypting it with a different password every time, and a technique of charging for acquisition of position information. Is done.

According to the location information service system of the present invention, the originating terminal encrypts the location information one-time and transmits it to the destination terminal, and the destination terminal requests the location center to decrypt the encrypted location information. The location center decrypts the encrypted location information and returns the decrypted location information to the receiving terminal. In addition, the switching network performs proxy billing in response to a request for decryption from the receiving terminal to the location center.

[0014] Here, "one-time encryption" means an encryption method in which, when encrypting certain specific data, a different encryption result that can be decrypted is obtained each time.

FIG. 1 is a diagram showing the principle of the present invention.

According to the first aspect of the present invention, there are provided a switching network 7 and a transmitting terminal 1 and a receiving terminal 3 connected via the switching network 7.
A location center 5 connected to the switching network 7 and providing location information indicating the location of the transmitting terminal 1 to the receiving terminal 3
Wherein the originating terminal 1 stores the position information, generates a key for encryption, and uses the generated key to generate the position information. To generate the encrypted position information, notify the receiving terminal of the encrypted position information, the receiving terminal receives the encrypted position information from the transmitting terminal 3, and receives the encrypted position information. A request for decryption is sent to the location center 5 via the switching network 7, and the
Responds to the request for decryption from the receiving terminal 3 to the location center 5, charges the receiving terminal 3 for a location information providing service fee from the location center 5 to the receiving terminal 3, 5 receives the encrypted position information and a request for decryption of the encrypted position information from the receiving terminal 3 and generates the position information of the transmitting terminal 1.
The encrypted position information is decrypted using a decryption key corresponding to the key used in the transmitting terminal 1, and the generated position information is transmitted to the receiving terminal 3, and the receiving terminal 3 Receiving the position information from the position center 5 to use the position information of the transmitting terminal 1.

According to the present invention, the originating terminal notifies the called terminal of only the encrypted position information, so that the confidentiality of the telephone number of the originating terminal is maintained.

Also, a key for encryption and decryption is generated for each call from the calling terminal to the called terminal, and the encrypted location information changes for each call. Even if a pair of location information is stored, the encrypted location information cannot be decrypted. Therefore, the called terminal cannot decrypt the encrypted position information of the calling terminal without using the service of the service provider. Therefore, according to the present invention, each time a call is made from the calling terminal to the called terminal, the called terminal uses the location information service, and the service provider can charge the service user on the called terminal side.

Further, the receiver can be reliably charged according to the call from the receiving terminal to the location center.

In the invention according to claim 2, the transmission terminal 1
The encrypted location information generated by the location center 5 is encrypted location information with a time stamp obtained by encrypting the location information and a time stamp related to the first current time. When decrypting, the location information and the time stamp of the originating terminal are generated by decrypting the encrypted location information with the time stamp, and the location center 5 decrypts the encrypted location information. The time associated with the time stamp is compared with a second current time, and it is determined that the time associated with the time stamp does not fall within a predetermined time range with respect to the second current time Then, transmission of the generated location information to the receiving terminal 3 is suppressed.

Therefore, since the decryption processing at the location center 5 is performed only within a predetermined time period from the encryption processing at the transmitting terminal 1, the encrypted position acquired by another transmitting terminal from the other transmitting terminal is obtained. Use information, or
A so-called “reply attack” is prevented, and the position information that the position center 5 notifies the receiving terminal 3 is guaranteed.

According to a third aspect of the present invention, there is provided an outgoing terminal 1 having an outgoing terminal communicating means 11, an incoming terminal 3 having an incoming terminal communicating means 31, an exchange network 7 for setting up a call between the communicating means of the terminals, A location center 5 connected to the exchange network 7 via a location center communication means 51 and providing location information indicating the location of the originating terminal 1 to the terminating terminal 3; 1 is a storage unit 13 for storing the position information, an encryption unit 12 for generating an encryption key, encrypting the position information using the generated key, and generating encrypted position information. The receiving terminal 3 notifies the receiving terminal of the encrypted position information via the transmitting terminal communication means, and the receiving terminal 3 transmits the encrypted position information from the transmitting terminal 1 via the receiving terminal communication means 31. Location information The position center 5 transmits a request for decryption of the encrypted position information to the position center 5 and receives the position information from the position center. And a request for decryption of the encrypted position information from the receiving terminal 3 via the receiving terminal 3, and using the decryption key corresponding to the key used by the encrypting means 12 of the transmitting terminal 1, Decoding means 52 for decoding the encrypted position information, generating the position information of the transmitting terminal 1, and sending the generated position information to the receiving terminal 3 via the position center communication means 51. The switching network 7 provides a service charge for providing the location information from the location center 5 to the receiving terminal 3 for each call from the receiving terminal 3 to the location center 5.
And a proxy charging means 72 for charging a fee.

Since a call from the receiving terminal 3 to the location center 5 corresponds to a call from the transmitting terminal 1 to the receiving terminal 3,
Charging to the receiving terminal is reliably performed for each call.

According to a fourth aspect of the present invention, there is provided the switching network 7 and the transmitting terminal 1 and the receiving terminal 3 connected via the switching network 7.
And a location center 5 connected to the switching network 7 for decrypting encrypted location information corresponding to the location information to provide location information representing the location of the originating terminal 1 to the terminating terminal 3. The switching network 7 is a location information service system for performing a surrogate charging of the location information providing service fee from the location center 5 to the destination terminal 3 to the destination terminal 3 in response to a request from the destination terminal 3 to the location center 5. A location information use method of the transmitting terminal 1 in which the location information is stored, a key for encryption is generated, the location information is encrypted using the generated key, and the encrypted location information is Generated and notifies the receiving terminal 3 of the encrypted position information.

According to a fifth aspect of the present invention, there is provided the switching network 7 and the transmitting terminal 1 and the receiving terminal 3 connected via the switching network 7.
And a location center 5 connected to the switching network 7 for decrypting encrypted location information corresponding to the location information to provide location information representing the location of the originating terminal 1 to the terminating terminal 3. The switching network 7 is a location information service that performs a proxy charging of the location information providing service fee from the location center 5 to the destination terminal 3 to the destination terminal 3 in response to a request from the destination terminal 3 to the location center 5. The transmitting terminal 1 in the system, comprising: a storage unit 13 for storing the location information; a key for encryption; encrypting the location information using the generated key; And a communication unit 11 for notifying the receiving terminal of the encrypted position information, wherein the encryption unit 13 generates a work key by using a random number;
The system includes means for encrypting the position information using the work key, and means for encrypting the work key using the master key.

According to a sixth aspect of the present invention, there is provided a switching network 7 comprising: a transmitting terminal 1 and a receiving terminal 3 connected via the switching network 7.
And a location center 5 connected to the switching network 7 for decrypting encrypted location information corresponding to the location information to provide location information representing the location of the originating terminal 1 to the terminating terminal 3. The switching network 7 is a location information service that performs a proxy charging of the location information providing service fee from the location center 5 to the destination terminal 3 to the destination terminal 3 in response to a request from the destination terminal 3 to the location center 5. The transmitting terminal 1 in the system, comprising: a storage unit 13 for storing the location information; a key for encryption; encrypting the location information using the generated key; And a communication unit 11 for notifying the receiving terminal of the encrypted position information. The encrypting unit 11 uses a random number using a specific data as a seed to encrypt a work for encryption. The key A means for forming, and means for encrypting the location information using the work key for the encryption.

According to a seventh aspect of the present invention, there is provided a switching network 7 comprising: a transmitting terminal 1 and a receiving terminal 3 connected via the switching network 7.
And a location center 5 connected to the switching network 7 for decrypting encrypted location information corresponding to the location information to provide location information representing the location of the originating terminal 1 to the terminating terminal 3. The switching network 7 is a location information service that performs a proxy charging of the location information providing service fee from the location center 5 to the destination terminal 3 to the destination terminal 3 in response to a request from the destination terminal 3 to the location center 5. In the system, a storage medium storing a location information use program mounted on the transmission terminal 1, wherein the location information use program generates a key for encryption and uses the generated key to generate the encryption key. An encryption process for encrypting the location information and generating the encrypted location information; and a communication process for notifying the destination terminal 3 of the encrypted location information. Has a process for generating a work key by a random number, a process for encrypting the location information by using the work key, and a process for encrypting the work key using a master key.

According to an eighth aspect of the present invention, there is provided a switching network 7 comprising: a transmitting terminal 1 and a receiving terminal 3 connected via the switching network 7.
And a location center 5 connected to the switching network 7 for decrypting encrypted location information corresponding to the location information to provide location information representing the location of the originating terminal 1 to the terminating terminal 3. The switching network 7 is a location information service that performs a proxy charging of the location information providing service fee from the location center 5 to the destination terminal 3 to the destination terminal 3 in response to a request from the destination terminal 3 to the location center 5. In the system, a storage medium storing a location information use program mounted on the transmission terminal 1, wherein the location information use program generates a key for encryption and uses the generated key to generate the encryption key. An encryption process for encrypting the location information and generating the encrypted location information; and a communication process for notifying the destination terminal 3 of the encrypted location information. Has a process for generating a work key for encrypting the random number seed specific data, and a process for encrypting the location information using the work key for the encryption.

According to the ninth aspect of the present invention, there are provided a switching network 7 and a transmitting terminal 1 and a receiving terminal 3 connected via the switching network 7.
A location center 5 connected to the switching network 7 and providing location information indicating the location of the transmitting terminal 1 to the receiving terminal 3
The transmitting terminal 1 stores and encrypts the position information, notifies the receiving terminal 3 of the encrypted position information, and the receiving terminal 3 issues a request for decryption of the encrypted position information. Transmitting to the location center 5 via the switching network 7;
In the location information service system, the switching network 7 charges the receiving terminal 3 for the location information providing service fee from the location center 5 to the receiving terminal 3 in response to a request from the receiving terminal 3 to the location center 5. A method for using location information of the location center 5, comprising: receiving the encrypted location information and a request for decryption of the encrypted location information from the receiving terminal 3; and generating the location information of the originating terminal 1. The encrypted position information is decrypted using a decryption key corresponding to the key used in the transmitting terminal 1, and the generated position information is transmitted to the receiving terminal 3.

According to a tenth aspect of the present invention, the switching network 7, the transmitting terminal 1 and the receiving terminal 3 connected via the switching network 7, and the location of the transmitting terminal 1 connected to the switching network 7 are represented. A location center 5 for providing location information to the receiving terminal 3, and the transmitting terminal 1 stores the location information,
Encrypts, notifies the receiving terminal 3 of the encrypted position information, and the receiving terminal 3 transmits a request for decryption of the encrypted position information to the position center 5 via the switching network 7;
In the location information service system, the switching network 7 charges the receiving terminal 3 for the location information providing service fee from the location center 5 to the receiving terminal 3 in response to a request from the receiving terminal 3 to the location center 5. A communication unit 51 for receiving a request for decryption of the encrypted position information from the receiving terminal 3 and transmitting the position information to the receiving terminal 3; Decryption means 52 for decrypting the encrypted location information using a decryption key corresponding to the key used for the transmission terminal, and generating the location information of the transmitting terminal.
Means for decrypting an encrypted work key using a master key corresponding to the master key used in the transmitting terminal; and means for decrypting the encrypted position information using the decrypted work key. Decoding means.

The invention according to claim 11 represents the switching network 7, the transmitting terminal 1 and the receiving terminal 3 connected via the switching network 7, and the location of the transmitting terminal 1 connected to the switching network 7. A location center 5 for providing location information to the receiving terminal 3, and the transmitting terminal 1 stores the location information,
Encrypts, notifies the receiving terminal 3 of the encrypted position information, and the receiving terminal 3 transmits a request for decryption of the encrypted position information to the position center 5 via the switching network 7;
In the location information service system, the switching network 7 charges the receiving terminal 3 for the location information providing service fee from the location center 5 to the receiving terminal 3 in response to a request from the receiving terminal 3 to the location center 5. A communication unit 51 for receiving a request for decryption of the encrypted position information from the receiving terminal and transmitting the position information to the receiving terminal; Decryption means 52 for decrypting the encrypted position information using a decryption key corresponding to the decrypted key and generating the position information of the transmitting terminal.
Means for generating a work key for decryption by using data synchronized with specific data used in the transmission terminal as a seed, and decrypting the encrypted position information using the work key for decryption Means.

The twelfth aspect of the present invention represents the switching network 7, the transmitting terminal 1 and the receiving terminal 3 connected via the switching network 7, and the location of the transmitting terminal 1 connected to the switching network 7. A location center 5 for providing location information to the receiving terminal 3, and the transmitting terminal 1 stores the location information,
Encrypts, notifies the receiving terminal 3 of the encrypted position information, and the receiving terminal 3 transmits a request for decryption of the encrypted position information to the position center 5 via the switching network 7;
In the position information service system, the switching network 7 charges the receiving terminal 3 on behalf of the receiving terminal 3 in response to a request from the receiving terminal 3 to the position center 5 for a position information providing service fee from the position center 5 to the receiving terminal 3. , Location center 5
A storage medium storing a location information use program mounted on the communication terminal, wherein the location information use program uses a decryption key corresponding to the key used when encrypting at the transmission terminal 1. A decryption process for decrypting the encrypted location information and generating the location information of the transmitting terminal, wherein the decrypting process uses a master key corresponding to a master key used in the transmitting terminal 1; A process of decrypting the encrypted work key, and a process of decrypting the encrypted position information using the decrypted work key.

The invention according to claim 13 shows the switching network 7, the transmitting terminal 1 and the receiving terminal 3 connected via the switching network 7, and the location of the transmitting terminal 1 connected to the switching network 7. A location center 5 for providing location information to the receiving terminal 3, and the transmitting terminal 1 stores the location information,
Encrypts, notifies the receiving terminal 3 of the encrypted position information, and the receiving terminal 3 transmits a request for decryption of the encrypted position information to the position center 5 via the switching network 7;
In the position information service system, the switching network 7 charges the receiving terminal 3 on behalf of the receiving terminal 3 in response to a request from the receiving terminal 3 to the position center 5 for a position information providing service fee from the position center 5 to the receiving terminal 3. And a storage medium storing a location information use program mounted on the location center, wherein the location information use program stores a decryption key corresponding to the key used when encrypting at the transmitting terminal 1. Having a decryption process for decrypting the encrypted location information to generate the location information of the originating terminal 1, wherein the decryption process is synchronized with specific data used by the originating terminal 1. A process of generating a work key for decryption using data as a seed; and a process of decrypting the encrypted position information using the work key for decryption.

The invention according to claim 14 represents the switching network 7, the transmitting terminal 1 and the receiving terminal 3 connected via the switching network 7, and the location of the transmitting terminal 1 connected to the switching network 7. A location center 5 for decrypting encrypted location information corresponding to the location information in order to provide location information to the receiving terminal 3. The originating terminal 1 stores and encrypts the location information, The switching network 7 notifies the receiving terminal 3 of the localized position information, and in response to a request from the receiving terminal 3 to the position center 5, the switching network 7 pays a position information providing service fee from the position center 5 to the receiving terminal 3. A method of using the location information of the receiving terminal 3 in the location information service system that performs proxy charging for the receiving terminal 3, wherein the encrypted location information is received from the transmitting terminal 1, and the received encrypted location information is updated together with the received encrypted location information. A request for decryption of the encrypted position information is transmitted to the location center 5 via the switching network 7, receives the location information from the location center 5 for utilizing the position information of the sending terminal 1.

The invention according to claim 15 represents the switching network 7, the transmitting terminal 1 and the receiving terminal 3 connected via the switching network 7, and the location of the transmitting terminal 1 connected to the switching network 7. A location center 5 for decrypting encrypted location information corresponding to the location information in order to provide location information to the receiving terminal 3. The originating terminal 1 stores and encrypts the location information, The switching network 7 notifies the receiving terminal 3 of the localized position information, and in response to a request from the receiving terminal 3 to the position center 5, the switching network 7 pays a position information providing service fee from the position center 5 to the receiving terminal 3. A receiving terminal 3 in a location information service system that performs surrogate charging for the receiving terminal 3. The receiving terminal 3 receives the encrypted position information from the transmitting terminal 1, and transmits the encrypted position information together with the received encrypted position information. A request for issue of sending to said location center 5 via the switching network 7, a communication means 31 for receiving the location information from the location center 5, the sending terminal 1
A position information acquisition unit 32 for generating a request for decryption of the encrypted position information in response to the reception of the encrypted position information from the position center 5 and converting the position information from the position center 5 into a usable format. Having.

The invention according to claim 16 shows the switching network 7, the transmitting terminal 1 and the receiving terminal 3 connected via the switching network 7, and the location of the transmitting terminal 1 connected to the switching network 7. A location center 5 for decrypting encrypted location information corresponding to the location information in order to provide location information to the receiving terminal 3. The originating terminal 1 stores and encrypts the location information, The switching network 7 notifies the receiving terminal 3 of the localized position information, and in response to a request from the receiving terminal 3 to the position center 5, the switching network 7 pays a position information providing service fee from the position center 5 to the receiving terminal 3. In the location information service system for performing the surrogate charging for the receiving terminal 3, a recording medium storing a location information using program mounted on the receiving terminal 3, wherein the location information using program is transmitted from the transmitting terminal 1. In response to receiving the serial encrypted position information, to create a request for decryption of the encrypted position information, having position information acquisition process of converting the position information from the location center 5 to the available formats.

[0037]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, the present invention provides:
We propose a technology for transmitting the location information itself after encrypting it with a different password every time, and a technology for charging the location information for each call.

Therefore, a technique for encrypting with a different password each time, that is, a one-time encryption technique will be described first. One-time encryption can be defined as "obtaining a different encryption result and a decryptable encryption result every time encryption is performed when transmitting specific data".

FIG. 2 is an explanatory diagram of a first embodiment of one-time encryption according to the present invention. The transmitting side generates a different encryption work key based on a random number for each encryption, and encrypts transmission data to be encrypted using the generated work key. At this time, the decryption is performed by a method known as "key distribution method"("Introduction to Cryptography", Eiji Okamoto, Kyoritsu Shuppan, "Public Telephone Location Information Utilization System Device"
11-253640). That is, the transmission side encrypts the work key using a master key different from the work key, and transmits the encrypted work key to the reception side together with the encrypted transmission data. The receiving side decrypts the encrypted work key into the original work key using the decryption master key corresponding to the encryption master key on the transmission side. next,
The receiving side decrypts the received encrypted transmission data using the obtained original work key to obtain the reception data. When the work key is encrypted by the symmetric encryption method, a common key is used for the master keys of the transmission side and the reception side. However, when the work key is encrypted by the asymmetric encryption method, the encryption master is used. A key and a master key for decryption corresponding to the master key for encryption are used.

FIG. 3 is an explanatory diagram of a second embodiment of one-time encryption according to the present invention. In the second embodiment, the transmitting side and the receiving side use, for example, a random number generated by using synchronized data such as time as a seed for encryption (work key).
Since the seed data for generating the random numbers are synchronized, the work key on the transmitting side and the work key on the receiving side are the same. The transmitting side encrypts the transmission data using the work key and sends it to the receiving side. The receiving side decrypts the received encrypted transmission data using the work key to obtain the reception data. Also in this case, a different encryption result can be obtained every time encryption is performed by changing the synchronized data every time.

When the one-time encryption is applied to the location information service system, it becomes difficult to reuse the data on the receiving terminal side. Therefore, the receiving terminal requests the location center to decrypt the data for each call from the calling terminal. I do. As a result, the location center can charge the service charge of the location information service to the receiving terminal for each call. On the other hand, as a case where the one-time encryption is not applied, for example, in a mode in which the receiving terminal transmits the encrypted location information to the location center and acquires the location information decrypted by the location center, the If the correspondence between the "encrypted location information" and the "location information" is stored, location information can be obtained for the same encrypted location information without using a location center or the like. Caching to create a DB), and you will not be able to charge. One-time encryption is advantageous in that such data cannot be reused.

Further, in order to actually perform charging for each call for the location information service, the present invention uses a switching network.

FIG. 4 is a system configuration diagram of the location information service system according to the first embodiment of the present invention. The system shown in the figure includes a telephone exchange network 700 and a telephone exchange network 70.
0, a plurality of n outgoing terminals 100 ₁ , 10
0 ₂ ,. . . , 100 _n (hereinafter, may be generally referred to as a transmitting terminal 100), and a plurality of m receiving terminals 300 ₁ , 300 ₂ ,. . . , 300 _m (in the following description, it may be generally referred to as the terminating terminal 300)
And a position center 500. Calling terminal 1
00 is a position information storage unit 130 that stores position information;
A master key storage unit 132 for concealing and holding a master key for encryption, an encryption unit 120 for encrypting location information at the time of transmission, and a communication unit 11 for transmitting encrypted location information.
0. In this example, the position information means data in a record format capable of storing information capable of identifying a position such as longitude / latitude, address, building name, floor name, room number, and the like. The encryption unit 120 performs one-time encryption of the position information using the master key. Communication unit 1
10 has a transmission / reception function of a normal telephone and a function of transmitting the position information encrypted by the encryption unit at the time of calling.

In this example, the telephone exchange network 700 is a network for transmitting information between users, and the exchange 711,
712 and 713 and a network. The exchange is a telephone exchange that performs transmission between users.

The receiving terminal 300 has a function of decrypting and displaying the sent encrypted position information using the position center, in addition to the function of a normal telephone. Therefore, the receiving terminal 300 performs the communication function of a normal telephone, receives the encrypted position information from the calling terminal 100, makes a call to the position center 500, transmits the encrypted position information, and transmits the decrypted position information. It has a communication unit 310 for receiving information. The receiving terminal 300 has a position information acquisition unit 320. When the position information acquisition unit 320 receives the encrypted position information from the communication unit 310, the user inputs a dial button to determine whether to decrypt the encrypted position information. When the encrypted position information is to be decrypted, the communication unit 310 calls the telephone number of the position center 500, transmits the encrypted position information, and obtains the position information from the position center 500. Interpret according to the location information format, and arrange it in a format that can be displayed. The receiving terminal 300 further includes a display unit 330 that displays the position information received from the position information acquisition unit 320 and a message confirming the user's will, for example,
It has a display.

When receiving the position information decryption request from the receiving terminal 300, the position center 500 decrypts the encrypted position information received together with the request. The position center 500
A master key storage unit 530 that stores a master key corresponding to the master key stored in the transmitting terminal 100, a position information decryption request and encrypted position information are received, and the encrypted position information is decrypted using the master key. And a decryption unit 520 for returning the decrypted location information to the receiving terminal 300.

In the first embodiment of the present invention, the telephone exchange network 700 is, in particular, a “Dial” of Nippon Telegraph and Telephone Corporation.
We provide an information fee collection service like Q2. By using this information fee collection agency service, the usage fee of the information service provided by the location center 500 using the telephone exchange network 700 is collected by the telephone exchange network company together with the telephone fee. Therefore, the telephone number of the location center 500 is registered in the exchange as a target of the information fee proxy charging service. When the receiving terminal 300 on the service user side calls a telephone number starting with a specific number registered in the telephone exchange network in advance, the information fee collection agency service is activated, and the actual location where the telephone number is registered is registered. It converts it to the telephone number of the center and connects the receiving terminal to the location center. At this time, an information charge is charged to the receiving terminal in addition to the normal telephone charge. Thus, in the first embodiment of the present invention,
By using the information fee collection agency service of the telephone exchange network, it becomes possible to reliably charge the receiving terminal for the charge of the location information service for each call.

FIG. 4 is a sequence chart in the system according to the first embodiment of the present invention. Hereinafter, the operation of this system will be described with reference to the sequence chart.

First, when a caller notifying the location information dials the telephone number of the receiving terminal 300 at the transmitting terminal 100 (step 101), the encrypting unit 12 of the transmitting terminal 100
0 performs one-time encryption of the position information using the master key 132 (step 102). Next, the calling terminal 100
Sends a call to the receiving terminal 300 and transmits the encrypted location information (step 103). In this embodiment, the UUI [user / user / information] is used at the time of Setup using an ISDN line.
Thus, the encrypted position information can be transmitted. In addition, if it is not an ISDN line, it is transmitted by a modem signal, DTMF signal, out-channel (out of voice band) communication, or the like. At this time, when the encrypted work key needs to be transmitted as in the first embodiment of the one-time encryption,
An encrypted work key is transmitted along with the encrypted location information. The call transmitted from the calling terminal 100 arrives at the called terminal 300 via the switching network 700 (step 1).
04).

When receiving an incoming call at the receiving terminal 300, the called party goes off-hook (step 105), and the receiving terminal 300 returns a response signal to the switching network 700 (step 10).
6). At this time, the receiving terminal 300 receives, for example, the encrypted position information transmitted by the UUI by the position information obtaining unit 320. The switching network 700 that has received the response signal
00 and a call connection of the receiving terminal 300 are performed.

In the receiving terminal 300, the position information acquiring section 320 selectively displays a message on the display section 330 for allowing the called party to specify whether or not to decrypt the acquired encrypted position information. The user confirms the acquisition intention (step 108). If the called party has no intention to acquire,
The following processing is not performed. In addition, the acquisition intention confirmation may be performed every call depending on the application, but may be configured to follow a preset instruction, or
You may comprise so that an acquisition intention confirmation step may be omitted.

When decrypting the encrypted location information, the location information acquiring section 320 of the receiving terminal 300 decodes the encrypted location information so as to decrypt the stored location center 500 in advance.
(Step 109), and transmits the encrypted position information (step 11).
0). At this time, the location center 500
Is called using a different channel from the call between the receiving terminal 300 and the calling terminal 100. At this time, IS
If it is a DN line, the receiving terminal 300
The encrypted position information can be transmitted by the UI, and if the encrypted work key has been received, this key is also transmitted to the position center 500.

Upon receiving the incoming call (step 111), the location center 500 receives the transmitted encrypted location information,
If there is an encrypted work key, the work key is extracted (step 112), and a response signal is returned to the exchange network 700 (step 113).

In switching network 700, upon receiving a response signal from location center 500, a call connection is established between terminating terminal 300 and location center 500, and information corresponding to the amount set for the telephone number of location center 500 is established. The proxy billing is performed for the receiving terminal 300 (step 114).

The decryption unit 520 of the location center 500 decrypts the received encrypted location information, returns the decrypted location information to the receiving terminal 300, and disconnects the call (step 116). . When using the ISDN line, the UUI transmits the decoded location information using the UUI at the time of disconnect. The receiving terminal 300 receives the decrypted location information (step 117), and acquires the location information
Converts the acquired location information into an appropriate format,
It is displayed on the display unit 330 constituted by a display or the like.

Next, a case where the operation of each device of the system according to the first embodiment of the present invention is constructed as a program will be described with reference to the flowcharts of FIGS.

FIG. 6 is a flowchart of a program installed in the transmitting terminal according to the second embodiment of the present invention.

Step 201) If the user (caller) goes off-hook, the process proceeds to step 202; otherwise, the process waits.

Step 202) The user inputs the telephone number of the receiving terminal.

Step 203) The one-time encryption of the position information is performed using the master key by the above-mentioned method, and the encrypted position information is generated.

Step 204) Call the called terminal and transmit the encrypted position information. At this time, if it is ISDN, it can be transmitted by UUI during setup, and if it is not ISDN, it is transmitted by a modem signal, DTMF signal, out-channel communication, or the like. In addition, the first of one-time encryption
In the case of the embodiment, the encrypted work key is also transmitted.

Step 205) If the connection with the called terminal is successful, the process proceeds to step 206; otherwise, the process proceeds to step 209.

Step 206) A call with the receiving terminal is started.

Step 207) If a disconnection request has been issued from the receiving terminal or the terminal itself, or if the terminal has been on-hook, the process proceeds to step 208.

Step 208) Call disconnection processing is performed.

Step 209) If connection with the called terminal fails, error processing is performed.

FIG. 7 is a flowchart of a program installed in the receiving terminal according to the third embodiment of the present invention.

Step 301) If an incoming call is received from the calling terminal via the switching network, the process proceeds to step 302, and if not, the process waits.

Step 302) When a call arrives, a ring tone sounds.

Step 303) It is determined whether or not the connection with the calling terminal has been successful.
4; otherwise, to step 314.

Step 304) A call with the calling terminal is started, and a response signal is returned to the calling terminal. If the transmitting terminal includes the encrypted position information, the encrypted position information is received.

Step 305) If the encrypted position information has been received from the calling terminal, the process proceeds to step 306; otherwise, the process proceeds to step 312.

Step 306) When the encrypted position information is received, the encrypted position information is extracted and obtained. When transmitted by UUI, the UUI in the Setup data is interpreted to obtain encrypted position information.

Step 307) The user confirms with the user whether or not it is necessary to decode the position information accompanied by charging. If the default setting has been made, no inquiry to the user is made.

Step 308) If the user has the intention of decoding, the process proceeds to step 309; otherwise, the process proceeds to step 312.

Step 309) Call the location center and transmit the encrypted location information. In response to this call, the receiving terminal is charged by the information fee collection agency service. Also, when the first embodiment of the one-time encryption is applied,
The encrypted work key is transmitted to the position center together with the encrypted position information.

Step 310) The decrypted position information is received from the position center, and the link to the position center is disconnected.

Step 311) The acquired position information is displayed on a display or the like in an appropriate format.

Step 312) When a disconnection request from the originating terminal or the terminal itself or on-hook is performed, the process proceeds to step 313, otherwise, it waits for on-hook.

Step 313) The call is disconnected.

Step 314) If the connection with the calling terminal fails, predetermined error processing is performed.

FIG. 8 is a flowchart of a program installed in the position center according to the fourth embodiment of the present invention.

Step 401) If a call is received from the called terminal via the switching network, the process proceeds to step 402, and if not, the process stands by.

Step 402) After receiving the call, the encrypted position information is extracted. When transmitted by UUI, the UUI in the Setup data is interpreted to obtain encrypted position information. When the encrypted work key is transmitted, the encrypted work key is also obtained.

Step 403) The response signal is returned to the switching network.

Step 404) The encrypted position information obtained from the receiving terminal is decrypted.

Step 405) The decrypted position information is transmitted to the receiving terminal, and the link with the receiving terminal is disconnected.

FIG. 9 is a sequence chart of the system according to the fifth embodiment of the present invention. The operation of the system will be described below with reference to the sequence chart. In a fifth embodiment of the present invention, location information is transmitted using a modem signal. On the other hand, in the above-described first embodiment of the present invention, the position information is transmitted by UUI.

First, when the caller who notifies the location information dials the telephone number of the receiving terminal 300 using the transmitting terminal 100 (step 501), the encryption unit 12 of the transmitting terminal 100
0 performs one-time encryption of the location information using the master key 132 (step 502). Next, the calling terminal 100
Originates a call to the receiving terminal 300 (step 503), and the call transmitted from the calling terminal 100 arrives at the receiving terminal 300 via the switching network 700 (step 504).

When receiving an incoming call at receiving terminal 300, the called party goes off-hook (step 505), and receiving terminal 300 returns a response signal to switching network 700 (step 506).
A call connection is made between the calling terminal 100 and the called terminal 300 (step 507). Next, the calling terminal 100
The encrypted position information is transmitted to the receiving terminal using the modem signal (step 508). The receiving terminal 300 receives, for example, the encrypted position information transmitted by the modem signal in the position information obtaining unit 320 (Step 509).

In the receiving terminal 300, the position information acquiring section 320 selectively displays a message for allowing the called party to specify whether or not to decrypt the acquired encrypted position information on the display section 330. The user confirms his / her intention to acquire (step 510). If the called party has no intention to acquire,
The following processing is not performed. In addition, the acquisition intention confirmation may be performed every call depending on the application, but may be configured to follow a preset instruction, or
You may comprise so that an acquisition intention confirmation step may be omitted.

When decrypting the encrypted location information, the location information acquiring section 320 of the receiving terminal 300 decodes the encrypted location information so as to decrypt the encrypted location information.
(Step 511). At this time, a call from the receiving terminal 300 to the location center 500 is transmitted between the receiving terminal 300 and the calling terminal 100.
Is performed using a different channel from the call. At this time, the encrypted position information is transmitted (step 11).
0). When the location center 500 receives the incoming call from the receiving terminal 300 via the exchange (step 512) (step 513), it returns a response signal to the switching network 700 (steps 514 and 515).

In switching network 700, upon receiving a response signal from location center 500, call connection is established between terminating terminal 300 and location center 500, and information corresponding to the amount set for the telephone number of location center 500 is established. The charge proxy charging is performed on the receiving terminal 300 (step 516).

Next, the receiving terminal 300 transmits the encrypted location information to the location center using the modem signal (step 517). The location center 500 receives, for example, encrypted location information transmitted by a modem signal (step 5).
18). The decryption unit 520 of the location center 500 decrypts the received encrypted location information (step 51).
9) Return the decoded location information to the receiving terminal 300 using the modem signal (step 520), and disconnect the call (step 521, step 522). The receiving terminal 300 receives the decoded position information, and the position information obtaining unit 320 converts the obtained position information into an appropriate format and causes the display unit 330, such as a display, to display the converted information (step 523). .

The system of the sixth embodiment of the present invention utilizes one-time encryption with a time stamp. One-time encryption with a time stamp means that the originating terminal 100
In the encryption unit 120, a time stamp is added to the position information, the position information with the time stamp is encrypted, transmitted to the position center 200 via the receiving terminal 300, and the position information with the time stamp is decrypted at the position center. This is an encryption method for verifying time.

FIG. 10 shows the encrypting unit 121 and the location center 5 of the originating terminal 100 for implementing one-time encryption with a time stamp in the system according to the sixth embodiment of the present invention.
100 is a diagram of a decoding unit 521. FIG.

The time stamp unit 123 of the encryption unit 121 of the originating terminal 100 acquires a time stamp such as the current time by a clock unit such as a clock in the terminal itself, and adds a time stamp to the transmission data representing the position information. , The transmission data with the time stamp is transmitted to the transmission data encryption unit 122.
Pass to. The transmission data encryption unit 122 encrypts the transmission data with the time stamp using the encryption key according to the one-time encryption described above, and sends the transmission data to the decryption unit 521 of the location center 500 via the receiving terminal 300.

The decryption unit 521 of the position center 300 decrypts the transmission data with the encrypted time stamp using the decryption key according to the one-time encryption described above, and passes the data to the time stamp extraction / verification unit 523. The time stamp extraction / verification unit 523 separates the position information and the time stamp from the decoded transmission data with the time stamp,
Obtains the current time from the clock means in the own device, verifies whether the separated and extracted time stamp is within a predetermined time, and sends the separated position information as received data if the verification is correct. I do.

By performing one-time encryption with a time stamp in this way, a reply attack is prevented,
It is possible to prevent "position spoofing" by another calling terminal.

While the representative embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications and applications are possible within the scope of the claims.

[0101]

As described above, according to the present invention,
(1) The location information is stored in the calling terminal, (2) the location information is obtained without using the ID (telephone number) of the calling terminal outside the exchange network, and (3) when the location information is provided (decoded). The called party is charged. (4) One-time encryption at the originating terminal and transmission to the receiving terminal, (5) The receiving terminal requests decryption to the location center with the encrypted location information, obtains the decryption result, and (6) exchanges The network performs proxy billing for the decryption request to the location center.

As a result, according to the present invention, (A)
Acquires location information at the time of communication, and (B) the ID (telephone number etc.) of the calling terminal is concealed by both the calling side and the called side,
(C) Billing is possible, (D) The receiving terminal is not limited to a terminal having a specific telephone number, and (D) Falsification of position information is prevented. In particular, (E) the receiving terminal can be reliably charged without reusing data, and (F) information provision and charging can be performed in response to a positive request from the called party.

The present invention also relates to a service provider having a switching network,
Businesses with originating terminals and location centers can apply to different business models.

[Brief description of the drawings]

FIG. 1 is a principle configuration diagram of the present invention.

FIG. 2 is an explanatory diagram of a first embodiment of one-time encryption according to the present invention.

FIG. 3 is an explanatory diagram of a second embodiment of one-time encryption according to the present invention.

FIG. 4 is a system configuration diagram of the first embodiment of the present invention.

FIG. 5 is a sequence chart in the system according to the first embodiment of the present invention.

FIG. 6 is a flowchart of a program installed in a calling terminal according to a second embodiment of the present invention.

FIG. 7 is a flowchart of a program installed in a receiving terminal according to a third embodiment of the present invention.

FIG. 8 is a flowchart of a program installed in a position center according to a fourth embodiment of the present invention.

FIG. 9 is a sequence chart in the system according to the fifth embodiment of the present invention.

FIG. 10 is an explanatory diagram of encryption with a time stamp according to a sixth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Calling terminal 3 Receiving terminal 5 Location center 7 Switching network 11 Calling terminal communication means 12 Encryption means 13 Storage means 31 Receiving terminal communication means 32 Location information acquisition means 51 Position center communication means 52 Decoding means 71 Exchange means 72 Proxy charging means

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) H04L 9/16 H04B 7/26 106B 5K067 H04M 1/66 109R 9A001 3/42 H04L 9/00 601A 15/00 643 H04Q 7 / 04 CH (72) Inventor Kenji Yasunaga 2-3-1 Otemachi, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Shinichi Mine 2-3-1 Otemachi, Chiyoda-ku, Tokyo Sun F-term (for reference) within Nippon Telegraph and Telephone Corporation (reference) EE13 EE16 EE17 GG16 GG18 5K027 AA04 BB09 EE01 FF22 HH23 5K067 AA29 AA32 DD17 EE02 EE16 FF03 FF04 FF05 FF07 FF23 HH07 HH22 HH23 HH36 JJ52 JJ64 KK15 9A001 EE03 JJ03 JJ11

Claims (16)

[Claims] 1. A switching network, a transmitting terminal and a receiving terminal connected via the switching network, and a position center connected to the switching network and providing position information indicating the location of the transmitting terminal to the receiving terminal. In the location information service system having the above, the originating terminal stores the location information, generates a key for encryption, encrypts the location information using the generated key, and converts the encrypted location information. Generate the encrypted location information and notify the called terminal to the called terminal. The called terminal receives the encrypted position information from the calling terminal, and issues a request for decryption of the encrypted position information via the exchange network. Sending to the location center, the switching network acting on behalf of the terminating terminal for a location information providing service fee from the location center to the terminating terminal in response to a request for decoding from the terminating terminal to the location center The location center is used by the originating terminal to receive the encrypted location information and the request to decrypt the encrypted location information from the destination terminal, and to generate the location information of the originating terminal. Decrypting the encrypted location information using a decryption key corresponding to the key, transmitting the generated location information to the destination terminal, and the destination terminal transmits the location information of the originating terminal to the destination terminal. A method of using location information, wherein the location information is received from the location center for use. 2. The encrypted location information generated by the originating terminal is time-stamped encrypted location information obtained by encrypting the location information and a time stamp associated with a first current time, and the location center When decrypting the encrypted location information, the location information and the time stamp of the originating terminal are generated by decrypting the encrypted location information with the time stamp. After decrypting the encrypted position information, the time associated with the time stamp is compared with a second current time, and the time associated with the time stamp falls within a predetermined time range with respect to the second current time. The location information use method according to claim 1, wherein when it is determined that there is no location information, transmission of the generated location information to the receiving terminal is suppressed. 3. A transmitting terminal having transmitting terminal communication means,
A receiving terminal having receiving terminal communication means, an exchange network for setting up a call between the communication means of the terminals, and location information connected to the exchange network via a location center communication means and indicating the location of the calling terminal; A location information service system having a location center for providing the location information, wherein the originating terminal generates storage keys for storing the location information, generates an encryption key, and uses the generated key to generate the location information. And encrypting means for generating encrypted position information, notifying the receiving terminal of the encrypted position information via the transmitting terminal communication means, wherein the receiving terminal communicates with the receiving terminal communication means. Receiving the encrypted position information from the originating terminal, sending a request for decryption of the encrypted position information to the position center, and receiving the position information from the position center. The location center receives a request for decryption of the encrypted location information from the receiving terminal via the location center communication means, and corresponds to the key used by the encryption means of the transmitting terminal. The encrypted location information is decrypted using the decryption key thus generated, the location information of the originating terminal is generated, and the generated location information is transmitted to the destination terminal via the location center communication means. A switching means, wherein the switching network charges a service charge for providing the location information from the location center to the destination terminal to the destination terminal for each call from the destination terminal to the location center. A location information service system having means. 4. A switching network, a transmitting terminal and a receiving terminal connected through the switching network, and a terminal connected to the switching network for providing location information indicating the location of the transmitting terminal to the receiving terminal. A location center for decrypting encrypted location information corresponding to the location information, wherein the switching network provides a location information providing service from the location center to the destination terminal in response to a request from the destination terminal to the location center. A method of using location information of a calling terminal in a location information service system that charges a fee to the called terminal on behalf of the terminal, storing the location information, generating a key for encryption, and using the generated key. A position information using method for encrypting the position information, generating encrypted position information, and notifying the receiving terminal of the encrypted position information. 5. A switching network, a calling terminal and a receiving terminal connected via the switching network, and a terminal connected to the switching network for providing location information indicating the location of the calling terminal to the receiving terminal. A location center for decrypting encrypted location information corresponding to the location information, wherein the switching network provides location information from the location center to the destination terminal in response to a request from the destination terminal to the location center. An originating terminal in a location information service system that substitutes a service charge for the terminating terminal, wherein a storage unit for storing the location information, an encryption key is generated, and the generated key is used by using the generated key. An encryption unit for encrypting the location information to generate the encrypted location information; and a communication unit for notifying the receiving terminal of the encrypted location information. A means for generating, means for encrypting said location information by using the work key, and means for encrypting the work key using a master key, and the originating terminal. 6. A switching network, a transmitting terminal and a receiving terminal connected via the switching network, and a terminal connected to the switching network for providing location information indicating the location of the transmitting terminal to the receiving terminal. A location center for decrypting encrypted location information corresponding to the location information, wherein the switching network provides location information from the location center to the destination terminal in response to a request from the destination terminal to the location center. An originating terminal in a location information service system that substitutes a service charge for the terminating terminal, wherein a storage unit for storing the location information, an encryption key is generated, and the generated key is used by using the generated key. An encryption unit for encrypting the location information to generate the encrypted location information; and a communication unit for notifying the receiving terminal of the encrypted location information, wherein the encryption unit seeds specific data. Means for generating a work key for encrypting the random number, and means for encrypting the location information using the work key for the encrypted, the originating terminal. 7. A switching network, a transmitting terminal and a receiving terminal connected via the switching network, and a terminal connected to the switching network for providing location information indicating the location of the transmitting terminal to the receiving terminal. A location center for decrypting encrypted location information corresponding to the location information, wherein the switching network provides location information from the location center to the destination terminal in response to a request from the destination terminal to the location center. In a location information service system for proxy charging a service charge to the receiving terminal, a recording medium storing a location information use program mounted on the transmitting terminal, wherein a key for encryption is generated, and the generated key is generated. And encrypting the location information using, and an encryption process for generating the encrypted location information, and a communication process for notifying the receiving terminal of the encrypted location information, The encryption process includes a process of generating a work key by using a random number, a process of encrypting the position information by using the work key, and a process of encrypting the work key by using a master key. A recording medium storing an information program. 8. A switching network, a transmitting terminal and a receiving terminal connected via the switching network, and a terminal connected to the switching network for providing location information indicating the location of the transmitting terminal to the receiving terminal. A location center for decrypting encrypted location information corresponding to the location information, wherein the switching network provides location information from the location center to the destination terminal in response to a request from the destination terminal to the location center. In a location information service system for proxy charging a service charge to the receiving terminal, a recording medium storing a location information use program mounted on the transmitting terminal, wherein a key for encryption is generated, and the generated key is generated. And encrypting the location information using, and an encryption process for generating the encrypted location information, and a communication process for notifying the receiving terminal of the encrypted location information, The encryption process includes a process of generating a work key for encryption using a random number using specific data as a seed, and a process of encrypting the position information using the work key for encryption. A recording medium storing an information use program. 9. A switching network, a transmitting terminal and a receiving terminal connected via the switching network, and a position center connected to the switching network for providing position information indicating the location of the transmitting terminal to the receiving terminal. The transmitting terminal stores and encrypts the location information, notifies the encrypted location information to the receiving terminal, and the receiving terminal transmits a request for decryption of the encrypted location information to the switching network. Location information for transmitting a location information providing service charge from the location center to the destination terminal on behalf of the destination terminal in response to a request from the destination terminal to the location center. A method of using location information of a location center in a service system, comprising: receiving the encrypted location information and a request to decrypt the encrypted location information from the receiving terminal; In order to generate the location information, the encrypted location information is decrypted using a decryption key corresponding to the key used at the originating terminal, and the generated location information is transmitted to the destination terminal. How to Use. 10. A switching network, a transmitting terminal and a receiving terminal connected via the switching network, and a position center connected to the switching network for providing position information indicating the location of the transmitting terminal to the receiving terminal. The transmitting terminal stores and encrypts the location information, notifies the encrypted location information to the receiving terminal, and the receiving terminal transmits a request for decryption of the encrypted location information to the switching network. Location information for transmitting a location information providing service charge from the location center to the destination terminal on behalf of the destination terminal in response to a request from the destination terminal to the location center. A location center in a service system, comprising: a communication unit that receives a request for decryption of the encrypted location information from the destination terminal, and transmits the location information to the destination terminal; Decrypting means for decrypting the encrypted position information using a decryption key corresponding to the key used at the time of encryption and generating the position information of the calling terminal; Encrypting means for decrypting the encrypted work key using a decryption master key corresponding to the encryption master key used in the transmitting terminal; and using the decrypted work key. Means for decrypting the encrypted position information. 11. A switching network, a transmitting terminal and a receiving terminal connected via the switching network, and a position center connected to the switching network for providing position information indicating the location of the transmitting terminal to the receiving terminal. The transmitting terminal stores and encrypts the location information, notifies the encrypted location information to the receiving terminal, and the receiving terminal transmits a request for decryption of the encrypted location information to the switching network. Location information for transmitting a location information providing service charge from the location center to the destination terminal on behalf of the destination terminal in response to a request from the destination terminal to the location center. A location center in a service system, comprising: a communication unit that receives a request for decryption of the encrypted location information from the destination terminal, and transmits the location information to the destination terminal; Decrypting means for decrypting the encrypted position information using a decryption key corresponding to the key used at the time of encryption and generating the position information of the calling terminal; Means for generating a work key for decryption by using data synchronized with specific data used in the transmitting terminal as a seed, and decrypting the encrypted position information using the work key for decryption And a means for converting. 12. A switching network, a transmitting terminal and a receiving terminal connected via the switching network, and a position center connected to the switching network for providing location information indicating the location of the calling terminal to the receiving terminal. The transmitting terminal stores and encrypts the location information, notifies the encrypted location information to the receiving terminal, and the receiving terminal transmits a request for decryption of the encrypted location information to the switching network. Location information for transmitting a location information providing service charge from the location center to the destination terminal on behalf of the destination terminal in response to a request from the destination terminal to the location center. In the service system, a storage medium storing a location information use program mounted on a location center, wherein a decryption key corresponding to a key used when encrypting at the transmission terminal is used. And decrypting the encrypted location information using the originating terminal to generate the location information of the originating terminal. The decrypting process corresponds to the master key for encryption used in the originating terminal. A position information utilization program, comprising: a process of decrypting an encrypted work key using a decryption master key; and a process of decrypting the encrypted position information using the decrypted work key. Recording medium storing. 13. A switching network, a transmitting terminal and a receiving terminal connected via the switching network, and a position center connected to the switching network for providing position information indicating the location of the transmitting terminal to the receiving terminal. The transmitting terminal stores and encrypts the location information, notifies the encrypted location information to the receiving terminal, and the receiving terminal transmits a request for decryption of the encrypted location information to the switching network. Location information for transmitting a location information providing service charge from the location center to the destination terminal on behalf of the destination terminal in response to a request from the destination terminal to the location center. In the service system, a storage medium storing a location information use program mounted on a location center, wherein a decryption key corresponding to a key used when encrypting at the transmission terminal is used. Decrypting the encrypted position information using the transmitting terminal, and generating a position information of the transmitting terminal. The decrypting process includes: synchronizing data synchronized with specific data used in the transmitting terminal. A recording medium storing a location information utilization program, comprising: a process of generating a work key for decryption as a seed; and a process of decrypting the encrypted location information using the work key for decryption. 14. A switching network, a transmitting terminal and a receiving terminal connected via the switching network, and the position for providing the receiving terminal with positional information indicating the location of the transmitting terminal connected to the switching network. A location center for decrypting the encrypted location information corresponding to the information, the transmitting terminal stores and encrypts the location information, notifies the encrypted location information to the receiving terminal, and the switching network A method of using location information of a terminating terminal in a location information service system in which a location information providing service fee from the location center to the terminating terminal is charged to the terminating terminal in response to a request from the terminating terminal to the location center. Receiving the encrypted location information from the originating terminal, and transmitting a request for decryption of the encrypted location information together with the received encrypted location information via the exchange network. And transmitted to the center, it receives the location information from the location center for using the location information of the calling terminal, the position information usage. 15. A switching network, a transmitting terminal and a receiving terminal connected via the switching network, and the position for providing the receiving terminal with positional information indicating the location of the transmitting terminal connected to the switching network. A location center for decrypting the encrypted location information corresponding to the information, the transmitting terminal stores and encrypts the location information, notifies the encrypted location information to the receiving terminal, and the switching network A receiving terminal in a position information service system for performing a surrogate charging of a position information providing service fee from the position center to the receiving terminal to the receiving terminal in response to a request from the receiving terminal to the position center. Receiving the encrypted position information, and transmitting a request for decryption of the encrypted position information together with the received encrypted position information to the position center via the exchange network; Communication means for receiving the location information from the location center; and in response to receiving the encrypted location information from the originating terminal, creating a request for decryption of the encrypted location information; A receiving terminal having position information acquiring means for converting the position information into a usable format. 16. A switching network, a transmitting terminal and a receiving terminal connected via the switching network, and the position for providing the receiving terminal with positional information indicating the location of the transmitting terminal connected to the switching network. A location center for decrypting the encrypted location information corresponding to the information, the transmitting terminal stores and encrypts the location information, notifies the encrypted location information to the receiving terminal, and the switching network In a location information service system, a location information providing service fee from the location center to the destination terminal is charged to the destination terminal in response to a request from the destination terminal to the location center. A storage medium storing a program, wherein a request for decryption of the encrypted position information is created in response to reception of the encrypted position information from the originating terminal, and Having a position information acquisition process of converting the position information from the data to the available formats, a recording medium storing location information using program.