JP2001148729A - Position information service system, position information using method for position information service system, originating terminal, key update center, and incoming 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 an exchange network, provides information at a request from an incoming terminal unlimitedly to a special number and charges the terminal for the information, and prevents position information from being fraudulently altered and data from being unauthorizedly reused. SOLUTION: The originating terminal has position information and a means for ciphering the position information by using a ciphering key, and ciphers the position information by using the ciphering key which is periodically updated (at contract limit time) and sends the ciphered information to a terminating terminal. The incoming terminal has a deciphering key and a means for deciphering the ciphered position information by using the deciphering key, and deciphers the ciphered position information sent from the incoming terminal by using a ciphering key distributed from a key update center when the ciphering key of the originating terminal is updated to obtain the position information.

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 without receiving the service from the service provider for the same telephone number that used the service once, and the service provider can provide the service user with the location information. The usage fee cannot be charged properly.

Therefore, an object of the present invention is to provide a location information service system for notifying the receiving terminal of the installation location of the transmitting terminal while maintaining the confidentiality of the telephone number of the transmitting terminal.

[0010] Further, the present invention provides a location information providing service in which only a terminating terminal to which a service use is permitted, such as by signing a regular contract, can use the service so that the service user can be properly charged. The purpose is to provide the system.

A further object of the present invention is to provide a system in which a receiving terminal can receive a location information service without making an inquiry to a service provider so that a communication load does not occur when using location information. I do.

Another object of the present invention is to provide a system in which an unauthorized receiving terminal that has not made a contract with a service provider cannot use the service illegally.

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

[0014]

According to the present invention, in order to achieve the above object, a transmitting terminal has location information and means for encrypting location information using an encryption key. The location information is encrypted (usually at the time of contract expiration) using the updated encryption key and transmitted to the receiving terminal. The receiving terminal has a decryption key and means for decrypting the encrypted position information using the decryption key, and the code distributed from the key update center at the time of contract or at the time of updating the encryption key of the transmitting terminal. Using the encryption key, the encrypted position information sent from the calling terminal is decrypted to obtain the position information.

Further, according to the present invention, by distributing a key containing incoming terminal identification information such as the incoming terminal telephone number from the key update center to the incoming terminal, the outgoing terminal can transmit the incoming terminal identification information. When the inserted key is generated, the position information is encrypted and transmitted, the receiving terminal decrypts the position information to obtain the position information.

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 information service system for providing location information indicating the location of the transmitting terminal 1 to the receiving terminal 3, wherein the transmitting terminal 1 encrypts the location information using an encryption key; Transmitting the encrypted location information to the terminating terminal 3 via the switching network 7;
The receiving terminal 3 decrypts the encrypted location information received from the transmitting terminal 1 using a decryption key, and processes the decrypted location information. A method of periodically updating the encryption key of the transmitting terminal 1, selecting a receiving terminal 3 permitted to decrypt the position information, and updating the selected receiving terminal 3 with the updating. And updating the decryption key corresponding to the encrypted encryption key and distributing the updated decryption key.

According to the second aspect of the present invention, in the key update step, the key update center 5 periodically updates the encryption key and the corresponding decryption key, and stores the updated encryption key in the key update center 5. Distributing the updated decryption key to the selected receiving terminal 3, distributing the updated decryption key to the selected receiving terminal 3, and distributing the updated encryption key to the transmitting terminal 1. Updating the existing encryption key, and updating the decryption key held by the selected receiving terminal 3 to which the updated decryption key has been distributed.

According to the third aspect of the present invention, in the key update step, the key update center 5 periodically updates the decryption key and replaces the updated decryption key with the selected receiving terminal 3. And the transmitting terminal 1 synchronizes with the updating of the decryption key in the key update center 5 so that the encryption key held in the own terminal corresponds to the updated decryption key. Updating, and updating the decryption key held by the selected receiving terminal 3 to which the updated decryption key has been distributed.

According to the present invention, the step of encrypting the position information using the encryption key includes the step of creating a work key using the encryption key and the identification information of the receiving terminal 3. And encrypting the location information using the work key. The key updating step includes transmitting the updated encryption key and the selected incoming call to the selected receiving terminal 3. A work key is created using the identification information of the terminal 3, and the created work key is distributed as the decryption key.

According to a fifth aspect of the present invention, there is provided a switching network 7 including a transmitting terminal 1 and a receiving terminal 3 connected via the switching network 7.
And a location information service system that provides location information indicating the location of the transmission terminal 1 to the reception terminal 3, wherein the transmission terminal 1 encrypts the location information using an encryption key. A means for transmitting the encrypted location information to the terminating terminal via the switching network;
Means for receiving the encrypted location information received from the calling terminal 1;
A means for decrypting the received encrypted position information using a decryption key; and a means for processing the decrypted position information. The receiving terminal 3 which is permitted to perform the decoding of the position information is selected, and the selected receiving terminal 3 is updated.
And a key update center 5 including key update means 51 for updating the decryption key corresponding to the updated encryption key, and key distribution means 52 for distributing the updated decryption key.

According to a sixth aspect of the present invention, there is provided a switching network 7 including a transmitting terminal 1 and a receiving terminal 3 connected via the switching network 7.
A location information service system that provides location information indicating the location of the originating terminal 1 to the receiving terminal 3, wherein the location information is encrypted using an encryption key; and Transmitting the location information to the terminating terminal 3 via the switching network, wherein only the terminating terminal 3 having a correspondingly updated decryption key has The transmitting terminal 1 further includes a step of periodically updating its own encryption key so that the encrypted location information from the transmitting terminal 1 can be decrypted.

According to a seventh aspect of the present invention, there is provided an exchange network comprising: a calling terminal 1 and a called terminal 3 connected via the switching network 7;
A location information service system for providing location information indicating the location of the originating terminal 1 to the terminating terminal 3; a means 13 for storing the location information; a means 15 for storing an encryption key; Means for encrypting the location information using an encryption key, and means for transmitting the encrypted location information to the terminating terminal via the exchange network.
And periodically updates the encryption key of its own terminal so that only the receiving terminal holding the correspondingly updated decryption key can decrypt the encrypted location information from the transmitting terminal. And a transmitting terminal having means 14.

According to an eighth 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.
A location information service system that provides location information indicating the location of the transmitting terminal 1 to the receiving terminal 3. The process of encrypting the location information using an encryption key, and only the terminating terminal 3 holding the correspondingly updated decryption key decrypts the encrypted location information from the originating terminal 1. And a process of periodically updating the encryption key of the terminal itself.

According to a ninth 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.
A location information service system that provides location information indicating the location of the transmitting terminal 1 to the receiving terminal 3 and decrypts the encrypted location information received from the transmitting terminal 1 using a decryption key. And a step of processing the decrypted location information, wherein the location information of the receiving terminal 3 is encrypted using an encryption key that is periodically updated in the transmitting terminal 1. And periodically updating the decryption key corresponding to the updated encryption key so that the updated location information can be decrypted.

According to a tenth aspect of the present invention, there is provided a switching network 7 having a calling terminal 1 and a receiving terminal 3 connected via the switching network 7, and the location information indicating the location of the calling terminal 1 is stored in the switching network 7. In the location information service system provided to the receiving terminal 3, a means 35 for storing a decryption key, a means 31 for receiving the encrypted location information from the transmitting terminal 1, Means 32 for decrypting the decrypted location information using the decryption key, means 33 for processing the decrypted location information, and encryption using the encryption key that is periodically updated in the originating terminal. Means 3 for periodically updating the decryption key corresponding to the updated encryption key so that the updated location information can be decrypted.
4 is a receiving terminal.

According to an eleventh aspect of the present invention, there is provided an exchange network 7 having a transmitting terminal 1 and a receiving terminal 3 connected through the switching network 7, and the location information indicating the location of the transmitting terminal 1 is stored in the switching network 7. In the location information service system provided to the receiving terminal 3, a recording medium storing a location information use program mounted on the receiving terminal 3, wherein the encrypted location information from the calling terminal 3 is used as a decryption key. Using the decrypted position information, using the decrypted location information, and decrypting the location information encrypted using the encryption key that is periodically updated in the transmitting terminal 1. And a process for periodically updating the decryption key corresponding to the updated encryption key.

According to a twelfth aspect of the present invention, there is provided a switching network 7, a transmitting terminal 1 and a receiving terminal 3 connected via the switching network 7, and the transmitting terminal 1 determines the location of the transmitting terminal 3. The position information to be represented is encrypted and transmitted to the receiving terminal 3,
In the location information service system in which the receiving terminal 3 decrypts the encrypted location information,
Is periodically updated to select the receiving terminal 3 permitted to decrypt the location information, and the selected receiving terminal 3 is assigned to the selected receiving terminal 3 in accordance with the updated encryption key. A method of using location information of a key update center, comprising: updating a decryption key; and distributing the updated decryption key to the selected receiving terminal 3.

According to a thirteenth 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 the transmitting terminal 1 determines the location of the transmitting terminal 3. The position information to be represented is encrypted and transmitted to the receiving terminal 3,
In the location information service system in which the receiving terminal 3 decrypts the encrypted location information,
Is periodically updated to select the receiving terminal 3 permitted to decrypt the location information, and the selected receiving terminal 3 is assigned to the selected receiving terminal 3 in accordance with the updated encryption key. This is a key update center having means 51 for updating a decryption key and means 52 for distributing the updated decryption key to the selected receiving terminal 3.

According to a fourteenth aspect of the present invention, there is provided an exchange network 7 having a calling terminal 1 and a receiving terminal 3 connected via the switching network 7, wherein the calling terminal 1 determines the location of the calling terminal 1. The position information to be represented is encrypted and transmitted to the receiving terminal 3,
In the location information service system in which the receiving terminal 3 decrypts the encrypted location information, a recording medium storing a location information use program installed in a key update center for updating encryption and decryption keys. Then, the encryption key of the originating terminal 1 is periodically updated, the receiving terminal 3 permitted to decrypt the location information is selected, and the updated encryption key is transmitted to the selected receiving terminal 3. A storage medium storing a location information utilization program including a process of updating a decryption key corresponding to a decryption key and a process of distributing the updated decryption key to the selected receiving terminal 3.

[0031]

FIG. 2 shows a first embodiment of the present invention.
It is a system configuration diagram of a position information service system. same
The illustrated system comprises a switching network 700 and a switching network 70.
A plurality of n outgoing terminals 100 connected to₁, 10
0₂,. . . , 100_n(In the following description,
Communication terminal 100).
Terminal 300 ₁, 300₂,. . . , 300_m(The following theory
In the description, it may be generally referred to as a receiving terminal 300.)
And a key update center 500.

The receiving terminal 300 uses the decryption key issued from the key updating center 500 to
The position information can be obtained by decrypting the encrypted position information sent from 00. Thus, the receiving terminal 300
The location information service from the business operator that operates and manages the transmitting terminal 100 and the key update center 500 is enjoyed. Therefore, this business operator enters into a regular contract with the receiving terminal user in order to collect an appropriate service fee from the receiving terminal user. Specifically, the user of the receiving terminal is issued a decryption key from the key update center for a certain period, and the key update center collects a service fee in the form of a delivery fee for the decryption key.

In a typical example, calling terminal 100 is a telephone such as a public telephone, and receiving terminal 300 is a personal computer.

The key update center 500 allows only the receiving terminal 300 under contract to decrypt the position information.
The pair of the encryption key and the decryption key is updated, for example, periodically according to the contract period. Then, the updated key is supplied to the transmitting terminal and the receiving terminal. To supply the key, various means including, for example, a telephone exchange network, a communication network such as the Internet, broadcast waves, or a portable storage medium such as a CD-ROM can be used. The present invention is not limited by the key supply mode.

In addition, instead of using the encryption key distributed from the key update center, the originating terminal may be configured to generate the encryption key in the terminal itself in synchronization with the key update center.

In the following, some embodiments of the key updating system in the location information service system will be described first.

FIG. 3 is a schematic block diagram of a system according to a third embodiment of the present invention. The system shown in the figure includes a transmitting terminal 100 and a receiving terminal 300 connected via a switching network 700, and a key updating center 500 connected to the transmitting terminal 100 and the receiving terminal 300 via a communication network 701. Having. Communication network 701 is, for example, the Internet. The transmitting terminal 100 includes an encryption unit 120 for encrypting the location information stored in a location information storage unit (not shown) at the time of transmission, and an encryption key storage unit for concealing and holding an encryption key for encryption. 150, and an encryption key receiving unit 140 that receives an encryption key from the key update center 500 via the communication network 701. In various embodiments of the present invention, the position information refers to data in a record format that can store information capable of identifying a position such as longitude / latitude, address, building name, floor name, room number, and the like. The encryption unit 120
One-time encryption of the location information is performed using the master key. A communication unit having a transmission / reception function of a normal telephone and a function of transmitting the position information encrypted by the encryption unit when making a call is not illustrated.

In this example, the switching network 700 is a network for transmitting information between users, and is composed of a switching device and a line network. The exchange is a telephone exchange that performs transmission between users.

The receiving terminal 300 has a decoding unit 320 for decoding the encrypted position information sent from the calling terminal, in addition to a communication unit that performs the function of a normal telephone (not shown). The decryption unit 320 decrypts the encrypted position information using the decryption key stored in the decryption key storage unit 350. The decryption key receiving unit 340 receives a decryption key from the key update center 500 via the communication network 701. The position information decoded by the decoding unit 320 is used for further processing such as display on a display.

A key update center 500 periodically updates an encryption key and a decryption key corresponding to the encryption key, and distributes the updated encryption key to the transmitting terminal 100 to update the key. And a key distribution unit 520 that distributes the decrypted key to the terminating terminal 300 that has a regular contract.

Here, as an example for explaining the relationship between the key update and the billing, in particular, the regular contract, it is assumed that the transmitting terminal is a general home telephone and the receiving terminal is a delivery center of a home delivery company. Upon receiving the encrypted location information from the originating terminal, the delivery center of the courier company decrypts the encrypted location information using the decryption key, and accurately determines the location information of the originating terminal, that is, the delivery destination of the item. Some can be automatically known. In order to realize such a location information service, it is necessary for the transmitting terminal operator to have a function of causing the transmitting terminal side to notify the receiving terminal of the encrypted positional information of the own terminal via the switching network. Therefore, for example, the transmitting terminal company gives the transmitting terminal an encrypted position information notification function free of charge to the transmitting terminal, and pays a key for decrypting the encrypted position information to the delivery center of the home delivery company for a fee. To distribute. However, if the decryption key is not updated and is always the same, the delivery center uses the encrypted position information as an index and stores the data in a format in which the position information obtained by decrypting the encrypted position information is specified by the index. By doing so, it is possible to construct a location information database of the calling terminal, and to acquire location information without performing decoding,
The location information service of the transmitting terminal operator is used improperly, that is, without using a proper fee. Therefore, the transmitting terminal operator not only distributes the decryption key only to the delivery center that has concluded the contract, but also periodically updates the decryption key and updates the decryption key only to the delivery center that is continuing the contract. Distribute the activation key. Therefore, the transmitting terminal operator establishes a new key distribution center, periodically updates the encryption key and the decryption key, distributes the updated encryption key to the transmitting terminal (free of charge), The decryption key is delivered only to the terminating terminal of the delivery center which has a location information providing service contract (ie, a contract for a regular distribution service of the decryption key) with the terminal. As a result, a location information providing service based on a regular contract is realized.

FIG. 4 is a schematic block diagram of a system according to a third embodiment of the present invention. The system of this embodiment is similar to the system of the second embodiment shown in FIG. 3, except that the originating terminal 100 is not supplied with an updated encryption key from the key update center 500. Then, an encryption key is generated in the terminal itself. More specifically, the encryption key generation unit 141 of the transmitting terminal 100 synchronizes with the time when updating the decryption key distributed to the receiving terminal at the key update center 500, and
An encryption key corresponding to the decryption key updated by the key update center 500 in the meaning of encryption / decryption is generated.

In a preferred embodiment of the method in which the transmitting terminal 100 periodically updates the encryption key by synchronizing with the key updating center 500, the transmitting terminal and the clock built in the key updating center are used to transmit the data. Both the terminal and the key update center update the key at the same specific date and time (for example, midnight on the first day of every month). FIG. 5 is an explanatory diagram of a key updating method using a symmetric encryption method according to the fourth embodiment of the present invention, and FIG. 6 is an explanatory diagram of a key updating method using an asymmetric encryption method according to the fifth embodiment of the present invention. .

In the symmetric encryption method shown in FIG. 5 in which the encryption key and the decryption key are equal, a random number is generated using at least one of the current key and time as a seed, and the generated random number is used as the updated key. I do. Random numbers can be pseudo-generated by using a one-way hash function such as MD5 or SH as a random number generation function ("Introduction to Cryptography", Eiji Okamoto,
Kyoritsu Shuppan, Rivest, RL and Dusse, S .: The MD5 mess
age-digest algorithm, Networking Group, INTERNET-d
raft, 1991). By using the source data (current key, time, etc.) as input when creating the key and using the output hash value as the updated encryption key, the randomness of the key is ensured and the restoration of the source data is prevented. Thus, forgery of the key is prevented.

In the asymmetric encryption method shown in FIG. 6, first, a one-way hash function is obtained by using at least one of the current (ie, before update) encryption key, decryption key, and time as seeds. A pseudo-random number is generated by using it as a random number generation function. Next, using the generated random numbers, an encryption key and a decryption key are generated by a method as described in the document: "Introduction to Cryptography" by Eiji Okamoto, Kyoritsu Shuppan.
If necessary, the originating terminal replaces the current encryption key with the updated encryption key, stores the decryption key generated for the next update, and the key update center replaces the current decryption key with the current encryption key. Replace with the updated decryption key and save the encryption key generated for the next update.

Next, the sixth aspect of the present invention for preventing the decryption key from being illegally used by a receiving terminal other than the decryption key contractor.
The user key according to the embodiment is described with reference to FIG. In order to prevent an unauthorized receiving terminal from using the decryption key, a decryption key used when the receiving terminal decrypts the encrypted position information may be different for each receiving terminal. Therefore, the encryption key used when encrypting the location information on the transmitting terminal side is generated using the identification information of the receiving terminal, for example, the telephone number of the receiving terminal,
The decryption key distributed from the key update center to the receiving terminal is also generated using the telephone number of the receiving terminal. Thus, the receiving terminal that has received the encrypted position information from the transmitting terminal cannot correctly decrypt the encrypted position information unless the decryption key unique to the terminal itself is supplied from the key update center.

As an example, the calling terminal calculates the exclusive OR of the master key distributed from the key update center or generated in the calling terminal in synchronization with the key updating center and the telephone number of the called terminal, The result is input to the above-mentioned one-way hash function, and the output result is used as a user key for encryption.
The key update center distributes a decryption user key that can be calculated in the same manner to the terminating terminal having a regular contract.

FIG. 9 is a schematic block diagram of a system according to a sixth embodiment of the present invention which utilizes the user key shown in FIG.
In this example, the updated master key is distributed from the key update center 500 to the transmitting terminal 100, and the transmitting terminal 100
, Generates an encryption user key, encrypts the position information with the generated encryption user key, and sends it to the receiving terminal 300.

The key update center 500 retrieves the telephone number of the receiving terminal 300 from the receiving terminal telephone number database, and uses the telephone number in accordance with the method shown in FIG. A work key is generated and distributed to the receiving terminal 300. In the receiving terminal 300,
The encrypted position information obtained from the transmitting terminal 100 is decrypted using the decryption key distributed from the key update center 500, and is used when generating the encryption user key and the decryption user key. If the called terminal telephone numbers do not match, the receiving terminal 300 cannot correctly decode.

FIG. 7 is a block diagram of a system according to a seventh embodiment of the present invention, in which a transmitting terminal 100, a receiving terminal 300, and a key update center 500 are connected via a telephone exchange network 700. The encrypted position information is sent to the receiving terminal 300, and the updated master key and user key (work key) are distributed from the key update center 500 to the transmitting terminal 100 and the receiving terminal 300. That is, in this example, the updated key is distributed via the telephone exchange network 700, and the key is updated by the above-described method using the user key.

The originating terminal 100 has a location information storage unit 130
Encrypting unit 1 for encrypting the location information stored in the telephone at the time of transmission
21, a master key storage unit 152 that conceals and holds a master key for encryption, and updates the master key stored in the master key storage unit 152 with the updated master key received from the key update center 500. A master key updating unit 151. The calling terminal 100 also has a communication unit 110 having a transmission / reception function of a normal telephone and a function of transmitting the position information encrypted by the encryption unit when making a call.

In this example, the telephone exchange network 700 is a network for transmitting information between users, and comprises a telephone exchange and a line network.

The receiving terminal 300 has a decoding unit 320 for decoding the encrypted position information sent from the calling terminal, in addition to the communication unit 310 for performing the function of a normal telephone. The decryption unit 320 decrypts the encrypted position information using the decryption user key stored in the user key storage unit 351, that is, the decryption key. The key update unit 341 is a telephone exchange network 7
00 and the updated user key received from the key update center 500 via the communication unit 310, and updates the user key in the user key storage unit 351. The position information decoded by the decoding unit 320 is passed to, for example, a display unit 331 that performs display on a display.

The key update center 500 periodically updates a master key, a master key storage unit 511 for storing an updated master key, and generates a user key using the updated master key. And a key distribution unit 520 that distributes the updated master key to the transmitting terminal 100 and distributes the updated user key to the receiving terminal 300 that has a regular contract. The key distribution unit 520 stores the telephone number of the delivery destination in the calling terminal telephone number database 515.
And from the receiving terminal telephone number database 514.

FIG. 10 is a sequence chart in the system according to the seventh embodiment of the present invention. Hereinafter, the operation of this system will be described along the sequence chart.

First, a caller notifying location information dials the telephone number of the called terminal at the calling terminal (step 10).
0), the encrypting unit of the transmitting terminal encrypts the location information using the master key and the telephone number of the receiving terminal (step 10).
1). The calling terminal calls the called terminal and transmits the encrypted location information (step 102). In this embodiment, the encrypted location information can be transmitted by UUI [user / user / information] during Setup using an ISDN line. If it is not an ISDN line, a modem signal, DT
Transmit by MF signal, out-channel (out of voice band) communication, etc. The call transmitted from the calling terminal 100 arrives at the called terminal via the switching network (step 103).

Upon receiving the position information, the receiving terminal decodes the position information (step 104) and displays the decoded position information in an appropriate format (step 10).
5). Next, the receiving terminal receives the incoming call, the called party goes off-hook (step 106), and the receiving terminal returns a response signal to the switching network (step 107). Upon receiving the response signal, the switching network establishes a call connection between the calling terminal and the called terminal (step 108).

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

FIG. 11 is a flowchart of a program installed in the transmitting terminal according to the eighth embodiment of the present invention.

Step 201) If the user (caller) goes off-hook, the process proceeds to step 202; otherwise, the process proceeds to step 209).

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

Step 203) Using the master key and the telephone number of the called terminal, the position information is encrypted by the above-described method to generate encrypted position information.

Step 204) Call the called terminal and transmit the encrypted location 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.

Step 205) If the connection with the called terminal is successful, the process proceeds to step 206; otherwise, the process proceeds to step 215.

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 the call is not off-hook by the caller, if there is an incoming call, the process proceeds to step 210; otherwise, the process waits.

Step 210) It is determined whether or not there is an incoming call from the key update center by an existing method such as notification of the caller ID (of the key update center). Otherwise, step 214
Move to

Step 211) Extract the master key. In particular, in the case of UUI transmission, the master key is extracted from the UUI in the Setup data.

Step 212) The master key held by the originating terminal is updated by the method described above.

Step 213) Call disconnection processing is performed.

Step 214) An incoming call operation is performed by a normal telephone function.

Step 215) If connection with the receiving terminal fails, error processing is performed.

FIG. 12 is a flowchart of a program installed in the receiving terminal according to the ninth embodiment of the present invention.

Step 301) If an incoming call arrives via the switching network, the process proceeds to step 302; otherwise, the process waits.

Step 302) It is determined whether or not there is an incoming call from the key update center by an existing method such as a caller ID notification (of the key update center). Otherwise, step 303
Move to

Step 303) If the position information has been received, the process proceeds to step 304; otherwise, the process proceeds to step 307.

Step 304) 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 305) The encrypted position information is decrypted by the method described above.

Step 306) The decrypted position information is displayed on the display of the receiving terminal.

Step 307) When there is an incoming call, a ring tone sounds.

Step 308) It is determined whether or not the connection with the calling terminal is successful.
9 and otherwise go to step 315.

Step 309) A call with the calling terminal is started, and a response signal is returned to the calling terminal.

Step 310) If a disconnection request from the originating terminal or its own terminal or if on-hook has been performed, the process proceeds to step 313, otherwise, it waits for on-hook.

Step 311) The call is disconnected.

Step 312) Extract the user key. In particular, in the case of UUI transmission, the user key is extracted from the UUI in the Setup data.

Step 313) The user key held by the receiving terminal is updated by the method described above.

Step 314) Call disconnection processing is performed.

Step 315) If the connection with the calling terminal fails, predetermined error processing is performed.

FIG. 13 is a flowchart of a program installed in the key update center according to the tenth embodiment of the present invention.

Step 401) If the key update date and time for updating the key has come (for example, midnight on the first day of every month), the process proceeds to step 402, and if not, the process waits.

Step 402) The method described above, for example,
A random number is generated by a pseudo-random number generation method using a one-way hash function.

Step 403) The generated random number is set as an updated new master key (stored in the memory).

Step 404) The telephone number of the transmitting terminal to which the master key is to be delivered is extracted from the transmitting terminal telephone number database.

Step 405) The updated new master key is delivered to the calling terminal.

Step 406) If there is a calling terminal to which the master key has not been delivered yet, the process proceeds to step 404; otherwise, the process proceeds to step 407.

Step 407) The telephone number of the receiving terminal to which the user key is to be delivered (that is, the subscriber) is extracted from the receiving terminal telephone number database.

Step 408) Using the master key and the telephone number of the receiving terminal, a user key unique to each receiving terminal is generated by the above-described method.

Step 409) The updated new user key is delivered to the receiving terminal.

Step 410) If there is a terminating terminating terminal whose user key has not been delivered yet, step 4
07, otherwise the key update process ends.

In the above embodiments, the case has been described where the encrypted position information on the receiving side is typically performed by software on the receiving terminal body such as a personal computer. However, decoding on the receiving side can also be realized by a decoder module connected to the receiving terminal.

FIG. 14 is a system configuration diagram of an eleventh embodiment of the present invention. The decoder module is connected to the downstream side of the receiving terminal when viewed from the transmitting terminal. For example, the decoder module is mounted on a personal computer. In the case of such a connection mode of the decoder modules, when the receiving terminal passes the encrypted position information transmitted from the transmitting terminal to the decoder module, the position information of the decryption result is returned from the decoder module.
The key update center distributes the updated decryption key to the decoder module. Therefore, the key distribution method can be appropriately set by the business operator that supplies the key update center and the decoder module.

FIG. 15 is a system configuration diagram of a twelfth embodiment of the present invention. The decoder module is connected to the upstream side of the receiving terminal when viewed from the transmitting terminal. For example, the decoder module is realized in the form of a terminal adapter. In the case of such a connection mode of the decoder module, the receiving terminal can directly acquire the position information as a result of the decryption of the encrypted position information transmitted from the transmitting terminal by the decoder module. In addition, since a transmitting terminal and a decoder module provided by the same carrier are typically connected via a switching network, a communication sequence between the transmitting terminal and the decoder module can be determined without bothering the user. Can be. Further, the receiving terminal body may not have a communication function other than the connection with the decoder module.

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

[0106]

As described above, according to the present invention, the location information is held in the transmitting terminal, so that the receiving terminal can obtain the positional information during communication. Since the ID (telephone number) of the calling terminal is not used outside the exchange network when acquiring the position information, the ID (telephone number) of the calling terminal is kept secret to both the caller and the called party. In addition, it is possible to reliably charge the receiver who receives the decryption service.

Further, according to the present invention, the special terminal is not used as the receiving terminal, so that the receiving terminal is not limited. Since the location information is encrypted, it is possible to prevent the falsification of the location information. In addition, according to the present invention, the originating terminal has location information and means for encrypting the location information using the encryption key, and the encryption key that is updated periodically (always at the time of contract expiration). To encrypt the location information and send it to the receiving terminal.
The receiving terminal has a decryption key and means for decrypting the encrypted position information using the decryption key, and the code distributed from the key update center at the time of contract or at the time of updating the encryption key of the transmitting terminal. Using the encryption key, the encrypted position information sent from the calling terminal is decrypted to obtain the position information. This makes it impossible to acquire position information after the contract expiration date. Further, since the position center is not used, there is an advantage that the communication cost at the time of decoding is reduced.

Also, by distributing the key containing the telephone number of the receiving terminal from the key update center to the receiving terminal, the key containing the telephone number of the receiving terminal is generated at the transmitting terminal and the position information is encrypted. When transmitted, the location information can be obtained by decoding at the receiving terminal. As a result, decryption can be performed only for incoming calls to the contracted receiving terminal, and unauthorized use of the key is prevented.

[Brief description of the drawings]

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

FIG. 2 is a system configuration diagram of a first embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of a system according to a second embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a system according to a third embodiment of the present invention.

FIG. 5 is an explanatory diagram of a key updating method according to a fourth embodiment of the present invention.

FIG. 6 is an explanatory diagram of a key updating method according to a fifth embodiment of the present invention.

FIG. 7 is an explanatory diagram of a method for generating a user key according to a sixth embodiment of the present invention.

FIG. 8 is a schematic configuration diagram of a system according to a sixth embodiment of the present invention.

FIG. 9 is a configuration diagram of a system according to a seventh embodiment of the present invention.

FIG. 10 is a sequence chart in the system according to the seventh embodiment of the present invention.

FIG. 11 is a flowchart of a program installed in a calling terminal according to an eighth embodiment of the present invention.

FIG. 12 is a flowchart of a program installed in a receiving terminal according to a ninth embodiment of the present invention.

FIG. 13 is a flowchart of a program installed in a key update center according to a tenth embodiment of the present invention.

FIG. 14 is a configuration diagram of a system according to an eleventh embodiment of the present invention.

FIG. 15 is a configuration diagram of a system according to a twelfth embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 originating terminal 3 destination terminal 5 key update center 7 exchange network 11 originating terminal communication means 12 encryption means 13 location information storage means 14 encryption key update means 15 encryption key storage means 31 destination terminal communication means 32 decryption means 33 position Information processing means 34 Decryption key update means 35 Decryption key storage means 51 Key update means 52 Key distribution means

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H04L 9/08 H04M 1/57 9A001 H04M 1/57 11/00 302 11/00 302 17/00 17/00 H04L 9 / 00 601B 601E (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 Japan F-term (Reference) in Telegraph and Telephone Corporation 5J104 AA01 AA16 BA01 EA01 EA06 EA16 EA18 EA25 EA26 NA02 NA03 NA11 NA12 NA27 PA07 PA11 5K024 AA51 AA71 BB00 CC01 DD01 DD02 DD04 DD05 DD06 FF03 GG00 GG01 HH00 5K01 EE03H01 KK08 KK16 LL01 MM07 NN21 NN22 PP03 SS07 UU08 UU16 9A001 BB02 BB03 BB04 CC04 CC05 EE03 JJ11 JJ25 KK56 LL03

Claims (14)

[Claims] 1. A location information service system comprising: a switching network; a transmitting terminal and a receiving terminal connected via the switching network; and providing location information indicating the location of the transmitting terminal to the receiving terminal. At the transmitting terminal, encrypting the location information using an encryption key, transmitting the encrypted location information to the receiving terminal via the switching network; Decrypting the encrypted location information received from the calling terminal using a decryption key,
Processing the decrypted location information, the receiving terminal being allowed to periodically update the encryption key of the originating terminal and to decrypt the location information. And updating the decryption key corresponding to the updated encryption key for the selected receiving terminal, and distributing the updated decryption key. . 2. The key updating step comprising: periodically updating an encryption key and a corresponding decryption key in a key update center; distributing the updated encryption key to the transmitting terminal; Distributing the decryption key to the selected receiving terminal, updating the encryption key held by the transmitting terminal to which the updated encryption key has been distributed, and updating the updated encryption key. 2. The method according to claim 1, further comprising the step of: updating the decryption key held by the selected receiving terminal to which the decryption key has been distributed. 3. The key update step includes: at a key update center, periodically updating a decryption key and distributing the updated decryption key to the selected receiving terminal. In synchronization with the update of the decryption key in the key update center, the encryption key held in the terminal is updated so as to correspond to the updated decryption key, and the updated decryption key is distributed. Updating the decryption key held by the selected terminating terminal in the terminal itself. 2. The method according to claim 1, further comprising: 4. The step of encrypting location information using the encryption key includes the steps of: creating a work key using the encryption key and the identification information of the called terminal; Encrypting location information, wherein the key updating step comprises: transmitting a work key to the selected receiving terminal using the updated encryption key and the identification information of the selected receiving terminal. 4. The location information use method according to claim 1, wherein the location information is created, and the created work key is distributed as the decryption key. 5. A location information service system comprising a switching network, a transmitting terminal and a receiving terminal connected via the switching network, and providing location information indicating the location of the transmitting terminal to the receiving terminal. The transmitting terminal has means for encrypting the location information using an encryption key, and means for transmitting the encrypted location information to the receiving terminal via the exchange network. A receiving terminal, a means for receiving the encrypted location information from the calling terminal, a means for decrypting the received encrypted location information using a decryption key, and the decrypted location information Means for periodically updating the encryption key of the transmitting terminal, selecting a receiving terminal permitted to perform position information decryption, and selecting the receiving terminal for the selected receiving terminal. Corresponding to the updated encryption key A location information service system further comprising a key update center including key updating means for updating a decryption key and key distribution means for distributing the updated decryption key. 6. A location information service system, comprising: a switching network; a transmitting terminal and a receiving terminal connected via the switching network; and providing position information indicating the location of the transmitting terminal to the receiving terminal. A method of using location information of a calling terminal, comprising: encrypting the location information using an encryption key; and transmitting the encrypted location information to the destination terminal via the exchange network. The transmitting terminal periodically changes its own encryption key so that only the receiving terminal holding the correspondingly updated decryption key can decrypt the encrypted location information from the transmitting terminal. A method for using location information further comprising the step of updating. 7. A location information service system, comprising: a switching network; a transmitting terminal and a receiving terminal connected via the switching network; and providing location information indicating the location of the transmitting terminal to the receiving terminal. Means for storing the location information; means for storing an encryption key; means for encrypting the location information using the encryption key; and means for encrypting the encrypted location information via the exchange network. Means for transmitting to the receiving terminal, the encryption key of the terminal itself so that only the receiving terminal holding the correspondingly updated decryption key can decrypt the encrypted location information from the transmitting terminal. Originating terminal comprising: 8. A location information service system, comprising: a switching network; a transmitting terminal and a receiving terminal connected via the switching network; and providing position information indicating the location of the transmitting terminal to the receiving terminal. A recording medium storing a location information use program mounted on the originating terminal, wherein a process of encrypting the location information using an encryption key, and an incoming call having a correspondingly updated decryption key A process for periodically updating the encryption key of its own terminal so that only the terminal can decrypt the encrypted location information from the originating terminal. 9. A location information service system, comprising: a switching network; a transmitting terminal and a receiving terminal connected via the switching network; and providing position information indicating the location of the transmitting terminal to the receiving terminal. A step of decrypting the encrypted location information received from the originating terminal using a decryption key, and a method of using the location information of the destination terminal, comprising processing the decrypted location information, In order to be able to decrypt the position information encrypted using an encryption key that is periodically updated in the sending terminal,
The method of using location information, further comprising the step of periodically updating the decryption key corresponding to the updated encryption key. 10. A location information service system, comprising: a switching network; a transmitting terminal and a receiving terminal connected via the switching network; and providing position information indicating the location of the transmitting terminal to the receiving terminal. Means for storing a decryption key; means for receiving encrypted location information from the originating terminal; means for decrypting the encrypted location information from the originating terminal using the decryption key. Means for processing the decrypted location information, and decrypting the location information encrypted using an encryption key that is periodically updated in the transmitting terminal,
Means for periodically updating the decryption key corresponding to the updated encryption key. 11. A location information service system, comprising: a switching network; a transmitting terminal and a receiving terminal connected via the switching network; and providing position information indicating the location of the transmitting terminal to the receiving terminal. A recording medium storing a location information use program mounted on the receiving terminal, wherein the encrypted location information from the transmitting terminal is decrypted using a decryption key, and the decrypted location is A process for making use of information, so that the location information encrypted using an encryption key that is periodically updated in the originating terminal can be decrypted,
A process of periodically updating the decryption key corresponding to the updated encryption key. 12. A switching network, comprising: a calling terminal and a receiving terminal connected via the switching network, wherein the calling terminal encrypts position information indicating the location of the calling terminal and transmits the encrypted position information to the called terminal. In the location information service system in which the receiving terminal decrypts the encrypted location information, an incoming call permitted to periodically update the encryption key of the transmitting terminal and decrypt the location information. Selecting a terminal, updating a decryption key corresponding to the updated encryption key for the selected receiving terminal, and distributing the updated decryption key to the selected receiving terminal And a method for utilizing the location information of the key update center. 13. A switching network, comprising: a calling terminal and a receiving terminal connected via the switching network, wherein the calling terminal encrypts position information indicating the location of the calling terminal and transmits the encrypted position information to the called terminal. In the location information service system in which the receiving terminal decrypts the encrypted location information, an incoming call permitted to periodically update the encryption key of the transmitting terminal and decrypt the location information. Means for selecting a terminal, updating the decryption key corresponding to the updated encryption key to the selected receiving terminal, and distributing the updated decryption key to the selected receiving terminal Key update center having means. 14. A switching network, comprising: a calling terminal and a receiving terminal connected via the switching network, wherein the calling terminal encrypts position information indicating the location of the calling terminal and transmits the encrypted position information to the called terminal. And a location information service system in which the receiving terminal decrypts the encrypted location information,
A storage medium storing a location information use program installed in a key update center for updating encryption and decryption keys, wherein the encryption key of the originating terminal is periodically updated to decrypt the location information. A process of selecting a receiving terminal that is permitted to perform, and causing the selected receiving terminal to update a decryption key corresponding to the updated encryption key; and selecting the updated decryption key. And a process for distributing the received information to the called terminal.