JP2007012046A - Remote lock system, communication terminal, remote lock method, and server for communication network - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a remote lock system for locking a stolen PC more rapidly and reliably. <P>SOLUTION: A communication terminal 20 determines whether a stop request signal for instructing the locking of a PC is included in a signal received from a communication network side when a transmission request and a position registration request are made to the communication network side including a base station 51. When the stop request signal is included, the communication terminal 20 prohibits the use of subscriber data 33, does not give key information (composed based on key data 31) to the PC 10, and stops hardware key function. The PC 10 stops operation when it cannot acquire key information from the communication terminal 20. Additionally, the communication network side refers to a subscriber information database 46 when receiving a transmission request or the like from the communication terminal 20, and transmits a stop request signal when the communication terminal 20 is an unauthorized one. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a remote lock system, a communication terminal, a remote lock method, and a remote lock communication network, and in particular, performs PC lock (stops the function of a PC) more quickly and reliably to a stolen PC. The present invention relates to a remote lock system, a communication terminal, a remote lock method, and a re-communication network server.

  In recent years, notebook PCs (personal computers) have become smaller and lighter, and mobile computing has become popular, and there are many opportunities to carry and use PCs. In this case, a PHS (Personal Handyphone System) packet communication service is used for communication connection between a PC and the Internet. In order to use this PHS packet communication service, a communication terminal (such as a portable PHS data communication terminal) 100 having a PCMCIA / I / F unit (PCMCIA interface unit) as shown in FIG. 9A is used. Then, as shown in FIG. 9B, this communication terminal is attached to the PC using PCMCIA • I / F, and performs packet data communication with the communication network.

  Alternatively, as shown in FIG. 9C, a communication terminal (such as a PHS data communication card) 100a having a USB terminal is used, and the communication terminal 100a is connected to the USB terminal of the PC to perform packet data communication. .

  By the way, when the PC is carried and used outside, the convenience is improved, but the risk of the PC being stolen increases. For example, there is a fear that an unauthorized third party takes away a PC left in a car or the like, reads out information recorded in the PC, and misuses it.

  For this reason, in order to give a security function to a PC, there is a device in which a hardware function (communication terminal A) such as a PHS data communication card is provided with a hard key function. For example, when a notebook PC equipped with a communication terminal A is stolen, a signal indicating the prohibition of use is sent to the communication terminal A from another communication terminal (communication terminal B) or a communication network such as a base station. Some have a remote lock function to lock the PC by disabling the function as a key.

  However, this function has a problem that when the communication terminal A is in a state where communication is not possible (out of service area, etc.), the use prohibition signal cannot be transmitted from the communication terminal B or the base station. In order to receive the use prohibition signal during a period in which A can communicate, it is necessary to periodically transmit the use prohibition signal from the communication terminal B or the base station to the communication terminal A. For this reason, there is a problem that the PC is not locked unless the use prohibition signal is transmitted within the communicable period of the communication terminal A.

  As a conventional technique, there is the following remote security system (for example, see Patent Document 1). That is, this remote security system includes an RF receiver that receives a signal from the communication system, and has a security function that can be remotely activated by commanding the RF receiver via the communication system. It is intended to provide. However, in the remote security system of this prior art, when the communication with the communication system is impossible, the security function cannot be activated and the above problem cannot be solved.

Moreover, there are portable terminal devices as follows (see, for example, Patent Document 2). This portable terminal device is designed to stop key input when the portable terminal device is stolen, and when a theft signal (specific signal) is received from the outside (host computer) Further, a theft state determination means provided inside operates to invalidate the key input. However, in the portable terminal device of this prior art, when it is in a state where communication with the outside is impossible, the security function cannot be operated, and the above-mentioned problems cannot be solved.
JP-A-11-134297 JP-A-3-100894

  As described above, a communication terminal equipped with a conventional hard key function has a problem in that a use prohibition signal cannot be transmitted to the communication terminal when the communication terminal is in a state where communication is not possible (such as out of service area). In order to avoid this, it was necessary to periodically transmit a use prohibition signal from another communication terminal or a base station so that the use prohibition signal is received during a period when the communication terminal can communicate. . For this reason, there is a problem that the PC is not locked unless the stolen communication terminal transmits a use prohibition signal within the communicable period.

  The present invention has been made to solve such a problem, and the object thereof is to lock a stolen PC more quickly and reliably, and to other communication terminals and base stations. It is an object of the present invention to provide a remote lock system, a communication terminal, and a remote lock method that can eliminate the need for periodic transmission of a use prohibition signal from the mobile phone and reduce the load on the communication network.

  A remote lock system according to the present invention includes a remote lock configured by a PC, a communication terminal configured to be detachable or connectable to the PC, and a communication network in which the PC performs data communication via the communication terminal. In the communication terminal, the communication terminal is provided with key information holding means for holding key information for granting operation permission to the PC, and at least one of a transmission request and a location registration request to the communication network. A stop request signal presence / absence determining means for determining whether or not a signal received from the communication network includes a stop request signal for instructing to stop the function of the PC. Key information control means for stopping providing the key information to the PC when the determination means determines that the stop request signal is included. The PC includes a key information detection unit that detects key information in the communication terminal, and the key information detection unit continues the operation of the PC when the key information can be obtained from the communication terminal. PC lock means for stopping the operation of the PC when the key information could not be obtained, and on the communication network side, a subscriber information database for recording subscriber information of the communication terminal, and from the communication terminal When at least one of a transmission request and a location registration request is received, the subscriber information database is referred to, and the communication terminal is not recorded in the subscriber information database, or is stored in the subscriber information database. Stop request signal generating means for generating the stop request signal and transmitting it to the communication terminal when information prohibiting the use of the communication terminal is registered Characterized in that it comprises a.

  With such a configuration, when the communication terminal makes at least one of a call origination request and a location registration request to the communication network, a signal received from the communication network side is stopped to stop the operation of the PC. It is determined whether or not a request signal (a signal for instructing PC lock) is included. If a stop request signal is included, the hard key function for the PC is stopped. Further, the PC continues the operation when the key information can be acquired from the communication terminal, and stops the operation when the key information cannot be acquired. Further, when receiving at least one of a call origination request and a location registration request from a communication terminal, the communication network side refers to the subscriber information database and determines whether or not the communication terminal is genuine. If it is illegal, a stop request signal is generated and transmitted to the communication terminal.

  As a result, when there is at least one of a transmission request or a location registration request from the communication terminal, a stop request signal (PC lock signal for stopping the PC function) can be transmitted from the communication network side. For this reason, it is possible to lock the PC that has been stolen more quickly and reliably. In addition, it is not necessary to periodically send a use prohibition signal from another communication terminal or base station to a stolen PC, and the load on the communication network can be reduced.

  In the remote lock system of the present invention, in the communication terminal, a subscriber information holding means for holding subscriber information of the communication terminal and a stop request signal presence / absence judging means are used to receive a signal from the communication network. It further comprises subscriber information control means for prohibiting the use of the subscriber information when it is determined that a stop request signal is included.

  With such a configuration, when the communication terminal receives a stop request signal for locking the PC from the communication network, the communication terminal prohibits the use of the subscriber information held in the communication terminal.

  As a result, authentication to the communication network cannot be performed, and access to the communication network can be prohibited.

  The remote lock system of the present invention is characterized in that the stop request signal is received by the communication terminal in an authentication phase with the communication network.

  With this configuration, the communication terminal receives a stop request signal for locking the PC from the communication network in the authentication phase. As a result, the PC can be locked at the initial stage when the stolen PC accesses the communication network.

  In the remote lock system of the present invention, the communication terminal is positioned relative to the communication network at least one of when the communication terminal is powered on or when the communication terminal moves between cells. A means for making a registration request is provided.

  With this configuration, each time the power is turned on to the PC and the communication terminal attached to the PC, or each time the communication terminal moves between cells, the communication terminal issues a location registration request to the communication network. Like that. Thereby, it is possible to perform PC lock (stopping the function of the PC) more quickly and reliably to the stolen PC.

  In the remote lock system according to the present invention, a timer for measuring a time during which communication by the PC has not been performed is provided in the communication terminal for a predetermined time, and when the measurement time of the timer expires, the communication network On the other hand, there is provided a means for making a transmission request.

  With such a configuration, a timer is provided in the communication terminal for measuring the time during which communication by the PC has not been performed for a certain period of time. To do. Thereby, it is possible to perform PC lock (stopping the function of the PC) more quickly and reliably to the stolen PC. In addition, it is not necessary to periodically send a use prohibition signal from another communication terminal or base station to a stolen PC, and the load on the communication network can be reduced.

  In the remote lock system of the present invention, a timer is provided in the PC for measuring a time during which the PC has not communicated for a certain period of time, and when the measurement time of the timer expires, the communication terminal is connected. And means for making a call origination request to the communication network.

  With such a configuration, a timer is provided in the PC for measuring the time during which the PC has not communicated for a certain period of time, and when the measured time of this timer expires, a call is transmitted to the communication network via the communication terminal. Make a request. Thereby, it is possible to perform PC lock (stopping the function of the PC) more quickly and reliably to the stolen PC. In addition, it is not necessary to periodically send a use prohibition signal from another communication terminal or base station to a stolen PC, and the load on the communication network can be reduced.

  The remote lock system according to the present invention further comprises means for detecting that the communication terminal is out of the range of the communication network and, if it is out of range, controlling stoppage of the operation of the PC by inputting a password. It is characterized by.

  With such a configuration, even when a PC with a PHS data communication card is stolen and taken out of the communication range, the PC lock (the PC function is stopped) more quickly and securely against the stolen PC. Can do).

  The remote lock system according to the present invention is characterized in that the communication terminal is a PHS data communication card that can be attached to and detached from the PC.

  With such a configuration, when a PC equipped with a PHS data communication card is stolen, the PC can be locked (stopping the PC function) more quickly and surely. it can.

  The communication terminal of the present invention is configured to be detachable or connectable to a PC, and a communication terminal having a hard key function for giving an operation permission to the PC, and the PC via the communication terminal. A communication network for performing data communication and transmitting a stop request signal for stopping the operation of the PC to the communication terminal, and the communication terminal in a remote lock system comprising: When performing at least one of a call origination request or a location registration request to the communication network, a signal received from the communication network when the key information holding unit holding key information for granting operation permission is sent to the communication network. Stop request signal presence / absence determining means for determining whether or not a stop request signal for instructing to stop the function of the PC is included; If it is determined that contains the stop request signal by a request signal presence determining means, characterized in that it comprises a key information control means for stopping to give the key information to the PC.

  With such a configuration, the communication terminal holds key information for granting operation permission to the PC, and from the communication network when making a call request or a location registration request to the communication network. It is determined whether or not the received signal includes a stop request signal (signal for locking the PC) instructing to stop the function of the PC. If it is determined that the stop request signal is included, the key information is stopped from being given to the PC, and the hard key function for the PC is stopped.

  As a result, the PC can be locked more quickly and reliably with respect to the stolen PC. In addition, it is not necessary to periodically send a use prohibition signal from another communication terminal or base station to a stolen PC, and the load on the communication network can be reduced.

  In the communication terminal of the present invention, the subscriber information holding means for holding the subscriber information and the stop request signal presence / absence determining means determine that the stop request signal is included in the received signal from the communication network. And a subscriber information control means for prohibiting the use of the subscriber information.

  With such a configuration, when the communication terminal receives a stop request signal for locking the PC from the communication network, the communication terminal prohibits the use of the subscriber information held in the communication terminal.

  As a result, authentication to the communication network cannot be performed, and access to the communication network can be prohibited.

  The communication terminal of the present invention is characterized in that the stop request signal from the communication network is received in an authentication phase with the communication network.

  With this configuration, the communication terminal receives a stop request signal for locking the PC from the communication network in the authentication phase. This makes it possible to lock the PC at the initial stage when the stolen PC accesses the communication network.

  In addition, the communication terminal of the present invention is characterized by comprising means for making a location registration request to the communication network at least one of when the power is turned on or when moving between cells.

  With such a configuration, each time the communication terminal mounted on the PC is turned on or the communication terminal moves between cells, the communication terminal makes a location registration request to the communication network. . Thereby, it is possible to perform PC lock (stopping the function of the PC) more quickly and reliably to the stolen PC.

  Further, the communication terminal of the present invention is provided with a timer for measuring a time during which communication by the PC has not been performed for a certain period of time, and means for making a transmission request to the communication network when the measurement time of the timer expires It is characterized by providing.

  With such a configuration, a timer is provided in the communication terminal for measuring the time during which communication by the PC has not been performed for a certain period of time. To do. Thereby, it is possible to perform PC lock (stopping the function of the PC) more quickly and reliably to the stolen PC. In addition, it is not necessary to periodically send a use prohibition signal from another communication terminal or base station to a stolen PC, and the load on the communication network can be reduced.

  The communication terminal of the present invention is characterized in that the communication terminal is a PHS data communication card that can be attached to and detached from the PC.

  With such a configuration, when a PC equipped with a PHS data communication card is stolen, the PC can be locked (stopping the PC function) more quickly and surely. it can.

  The remote lock method of the present invention includes a PC, a communication terminal configured to be detachable or connectable to the PC, and a communication network in which the PC performs packet data communication via the communication terminal. A remote lock method in the remote lock system, wherein the computer in the communication terminal holds a key information holding procedure for holding key information for granting an operation permission to the PC; Presence / absence of a stop request signal for determining whether or not a stop request signal instructing to stop the function of the PC is included in a signal received from the communication network when performing at least one of location registration requests When it is determined that the stop request signal is included by the determination procedure and the stop request signal presence / absence determination procedure, A key information control procedure for stopping giving the key information to the PC, and a key information detection procedure for detecting the key information in the communication terminal by the computer in the PC, and the key information detection procedure, If the key information can be acquired from the communication terminal, the PC operation is continued, and if the key information cannot be acquired, a PC lock procedure is performed to stop the PC operation. According to the procedure for recording subscriber information of the communication terminal in a subscriber information database, and when receiving at least one of a transmission request or a location registration request from the communication terminal, refer to the subscriber information database, The communication terminal is not recorded in the subscriber information database or the use of the communication terminal is prohibited in the subscriber information database That if the information is registered, the generates a stop request signal, characterized in that the stop request signal generating procedure to be transmitted to the communication terminal is performed.

  By such a procedure, when the communication terminal makes at least one of a call origination request and a location registration request to the communication network, a signal received from the communication network is stopped to stop the operation of the PC. It is determined whether or not a request signal (a signal for instructing PC lock) is included. If a stop request signal is included, the hard key function for the PC is stopped. Further, the PC continues the operation when the key information can be acquired from the communication terminal, and stops the operation when the key information cannot be acquired. Further, when receiving at least one of a call origination request and a location registration request from a communication terminal, the communication network side refers to the subscriber information database and determines whether or not the communication terminal is genuine. If it is illegal, a stop request signal is generated and transmitted to the communication terminal.

  As a result, when there is at least one of a transmission request and a location registration request from the communication terminal, a stop request signal (PC lock signal for stopping the PC function) can be transmitted from the communication network side. For this reason, it is possible to lock the PC that has been stolen more quickly and reliably. In addition, it is not necessary to periodically send a use prohibition signal from another communication terminal or base station to a stolen PC, and the load on the communication network can be reduced.

  The communication network server of the present invention is a PC, a communication terminal configured to be attachable to and detachable from the PC, and a communication network in which the PC performs data communication via the communication terminal. The communication network refers to the subscriber information database when receiving at least one of a subscriber information database for recording subscriber information of the communication terminal and a call origination request or a location registration request from the communication terminal. Is not recorded in the subscriber information database, or when the information prohibiting the use of the communication terminal is registered in the subscriber information database, a stop request signal is generated and the communication terminal And a stop request signal generating means for transmitting.

  As a result, the communication network that has received at least one of the transmission request and the location registration request from the communication terminal can transmit a stop request signal (PC lock signal for stopping the PC function). For this reason, it is possible to lock the PC that has been stolen more quickly and reliably. In addition, it is not necessary to periodically send a use prohibition signal from another communication terminal or base station to a stolen PC, and the load on the communication network can be reduced.

  In the present invention, it is possible to perform PC locking (stopping the function of the PC) more quickly and reliably to a stolen PC. In addition, it is not necessary to periodically send a use prohibition signal from another communication terminal or base station to a stolen PC, and the load on the communication network can be reduced.

  The present invention disables the hard key function immediately when the communication terminal A attached (or connected) to the stolen PC performs communication, thereby allowing the communication network side of another communication terminal B or a base station or the like. This makes it unnecessary to make regular calls from. As a function on the communication network side, upon request from a contract user of the communication terminal A, the communication terminal A rejects the connection by authentication when establishing a connection to the rope (transmission, location registration, etc.) and joins the communication terminal A A function to instruct the suspension of use of personal data.

  Also, when the use of subscriber data is stopped as a function of the communication terminal A, a mechanism for invalidating the hard key function is provided. With these functions, the hard key function can be stopped when the communication terminal A accesses the communication network.

  In the case of invalidating subscriber data, for example, when a user cancels due to loss of a communication terminal, a signal for invalidating subscriber data is sent to the cancellation terminal to suppress unnecessary communication. Some are prepared for the purpose. In the present invention, this function can be set as one of the hard key operating conditions of the communication terminal A, whereby a quick PC lock can be realized.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram for explaining an outline of a remote lock system according to the present invention.

  In the remote lock system 1 shown in FIG. 1, the PC 10 is a stolen personal computer, 20 is a communication terminal (for example, PHS data communication card) attached to the PC 10 (or USB connection), 51 is a base station (CS), 52 Indicates an authentication server. Note that the base station 51 and the authentication server 52 are devices belonging to the communication network side.

  Hereinafter, the flow of the process will be described with reference to FIG.

  First, in response to a user request, the rope manager performs a setting for rejecting authentication of the communication terminal 20 in the subscriber information database 46 of the authentication server 52 (step S1).

  Next, it is assumed that a network connection request (transmission request) is generated from the communication terminal 20 (step S2). In order to authenticate whether or not the connection source communication terminal 20 is valid in the connection sequence, an authentication request is issued to the communication terminal 20 (step S3). The communication terminal 20 returns an authentication response to the authentication request (step S4).

  The authentication server 52 confirms the contents of the authentication response of the communication terminal 20, but since authentication rejection is set in the subscriber information database 46 in step S 1, a subscriber data stop request (stop request signal) is sent to the communication terminal 20. ) Is issued (step S5).

  Since the communication terminal 20 has received the subscriber data stop request (stop request signal), the communication terminal 20 stores the invalid setting of the subscriber data 33. Thereafter, the subscriber data 33 is not set. With this as an opportunity, the PC 10 side is prohibited from providing the key information (information that constitutes the hard key information) 31, and the hard key function is stopped (step S6). The PC 10 detects that the hard key function of the communication terminal 20 has become invalid, and locks the PC (step S7).

  FIG. 2 is a diagram showing a hardware configuration example of the remote lock system 1 of the present invention. In FIG. 2, the remote lock system 1 includes a PC 10, a communication terminal 20, and a communication network 40. The communication network 40 is shown as the communication network 40 including the functions of the base station 51 and the authentication server 52 shown in FIG.

  The key information detection unit (key information detection unit) 11 of the control unit 13 of the PC 10 is a processing unit that detects key information (information that forms a hard key) 31 in the communication terminal 20. The PC lock function unit (PC lock means) 12 performs a process of locking the operation of the PC 10 when the key information detection unit 11 does not detect valid key information.

  The communication terminal 20 includes a control unit 21 and a nonvolatile memory 30. In the nonvolatile memory 30, key information (key information holding means) 31, a stop request reception flag 32, and subscriber data (subscriber information) 33 are recorded.

  The transmission / reception control unit 22 in the control unit 21 is a processing unit for performing wireless data transmission / reception with the communication network 40. The stop request presence / absence determination unit (stop request signal presence / absence determination means) 23 determines whether or not a stop request signal (signal for instructing PC lock) is included in the signal received from the communication network 40 via the transmission / reception control unit 22. The process which discriminates is performed.

  The stop request presence / absence determination unit 23 performs on / off control of the switch (SW1) 26 and the switch (SW2) 27. In this case, when it is determined that the stop request signal is included, the switch (SW1) 26 and the switch (SW2) 27 are turned off. Further, when it is determined that the stop request signal is included, the stop request presence / absence determination unit 23 performs a process of turning on the stop request reception flag 32 and determines that the stop request signal is not included. In this case, a process of turning off (OFF) is performed.

  When the switch (SW1) 26 is off (OFF), the key information control unit (key information control means) 24 refuses to provide key information to the PC 10 and stops the hard key function. Further, when the switch (SW1) 26 is on, the key information 31 is read, and the validity of the key information is confirmed with the key information detection unit 11 of the PC 10. There are several methods for confirming the key information. For example, the key information on the PC 10 side and the key information on the communication terminal 20 side are collated, and the communication terminal 20 is locked from the PC 10 side. There is a method for detecting whether or not there is.

  The subscriber data control unit (subscriber information control means) 25 reads the subscriber data (subscriber information) 33 in the nonvolatile memory (subscriber information holding means) 30, and communicates with the communication network via the transmission / reception control unit 22. The process which transmits to 40 is performed. The subscriber information is information used for authentication processing with the communication network 40 and the like.

  The communication network 40 includes a control unit 41 and a nonvolatile memory 45. The transmission / reception control unit 42 in the control unit 41 is a processing unit for performing transmission / reception of packet data wirelessly with the communication terminal 20. When the subscriber information control unit 44 receives a call request from the communication terminal 20, the subscriber information control unit 44 refers to the subscriber information database 46 in the non-volatile memory 45 and authenticates whether or not the communication terminal is a valid subscriber. Process to do.

  Further, the stop request generation unit (stop request signal generation unit) 43 determines that the communication terminal 20 that has issued the transmission request is not valid as a result of referring to the subscriber information database 46 by the subscriber information control unit 44. In such a case, a process for generating a stop request signal for performing PC lock is performed. The generated stop request signal is transmitted to the communication terminal 20 via the transmission / reception control unit 42.

  FIG. 8 is a diagram illustrating an example of the subscriber information database 46. As shown in FIG. 8, in the subscriber information database 46, telephone numbers, stop instructions, and other necessary information (for example, the type of contract service) are recorded using the subscriber ID as an index. Note that the stop instruction is information for the line manager to make a setting for rejecting authentication of the communication terminal 20 when there is a request to stop using the communication terminal 20 due to a request from a legitimate user. For example, a case of “x” is a subscriber ID for which authentication is denied. Note that the subscriber ID and the telephone number itself may be deleted in response to a request from a legitimate user so that authentication based on subscriber information cannot be performed.

[Description of First Processing Method in Remote Lock System 1]
In the above-described configuration example of the remote lock system 1, the call request from the communication terminal 20 to the communication network 40 includes not only the call operation by the user (in this case, the person who uses the stolen PC 10) but also location registration. And This is because there are cases where a call operation by an unauthorized user cannot be expected, and it is preferable that there are many connection requests.

  FIG. 3 is a flowchart showing a first processing method in the remote lock system 1 of the present invention. This flowchart shows the flow of processing in the communication terminal 20 and shows the most basic method of PC lock processing in the communication terminal 20. Hereinafter, the flow of the process will be described with reference to FIG.

  Initially, the remote lock system 1 is in a standby state (step S11). Then, the communication terminal 20 detects a communication request from the PC 10 (step S12). If a communication request is detected, the process proceeds to step S14. If no communication request is detected, the start of location registration of the communication terminal 20 itself is detected (step S13). If the start of location registration is detected, the process proceeds to step S14. If the start of location registration is not detected, the process returns to step S12.

  If a communication request is detected in step S12 or the start of location registration is detected in step S13, communication between the communication terminal 20 and the communication network 40 is started (step S14). With the start of communication, an authentication phase is performed between the communication terminal 20 and the communication network 40. In this authentication phase, the communication terminal 20 determines whether or not a stop request signal has been received from the communication network 40 (step). S15). If the communication terminal 20 does not receive the stop request signal, the communication is continued as it is (step S16). When the communication is completed (step S17), the communication terminal 20 returns to step S12 and enters the standby state again.

  If it is determined in step S15 that the communication terminal 20 has received the stop request signal from the communication network 40, the communication terminal 20 immediately ends the communication (step S18) and turns on the stop request reception flag 32 (ON). Then, the switch (SW2) 27 is turned off (step S19), and the use of the subscriber data 33 is stopped (step S20). Further, the switch (SW1) 26 is turned off (OFF), the use of the key information 31 is stopped, and the hard key function is stopped (step S21). As a result, the standby state is terminated and the PC 10 is locked (step S22).

  With such a processing procedure, when there is a transmission request and a location registration request from the communication terminal 20, a stop request signal (PC lock signal for stopping the function of the PC 10) can be transmitted from the communication network 40 side. For this reason, the PC lock can be performed more quickly and reliably on the stolen PC 10. Further, it is not necessary to periodically send a use prohibition signal from another communication terminal or base station to the stolen PC 10, and the load on the communication network 40 can be reduced.

[Description of Second Processing Method in Remote Lock System 1]
Further, the execution timing of the start of location registration can be performed not only when moving between cells but also when the communication terminal 20 is turned on. Accordingly, it is possible to receive from the subscriber information database 46 whether or not there is a use stop request generated during a period in which the power supply of the communication terminal 20 is off.

  FIG. 4 is a flowchart showing a second processing method in the remote lock system 1 of the present invention. This flowchart shows the flow of processing in the communication terminal 20, and as the execution timing of the location registration start in the communication terminal 20, not only when moving between cells but also when the communication terminal 20 is turned on. It is.

  In the flowchart shown in FIG. 4, the portions surrounded by broken lines (steps S11 to S22) are common to the flowchart shown in FIG. 3, and steps S31 to S36 are newly added to the flowchart shown in FIG. Part. Hereinafter, the processing flow will be described with reference to the flowchart shown in FIG. 4, focusing on the newly added steps S31 to S36.

  First, the PC 10 and the communication terminal 20 are turned on (step S31). In the communication terminal 20, it is determined whether or not the stop request reception flag 32 in the nonvolatile memory 30 is on (ON) (step S32). When the stop request reception flag 32 is on (ON), the process proceeds to step S20, the switch (SW2) 27 is turned off (OFF), and the use of the subscriber data 33 is stopped. Further, the switch (SW1) 26 is turned off (OFF), the use of the key information 31 is stopped, and the hard key function is stopped (step S21). As a result, the standby state is terminated and the PC 10 is locked (step S22).

  If it is determined in step S32 that the stop request reception flag 32 is off (OFF), the communication terminal 20 starts location registration (step S33). The communication terminal 20 determines whether or not a stop request signal is received from the communication network 40 in the authentication phase in this location registration (step S34). If it is determined that the stop request signal has been received, the process proceeds to step S18, where the communication is terminated and the PC is locked (steps S19 to S22).

  If it is determined in step S34 that the stop request signal has not been received, the communication terminal 20 continues the location registration process (step S35). Then, when the position registration process is finished, the communication is finished (step S36), and the standby state is entered (step S11). In addition, the process after step S11 becomes the flow of the same process as the flowchart shown in FIG.

  With such a processing procedure, the communication terminal 20 can make a location registration request to the communication network 40 every time the PC 10 and the communication terminal 20 attached to the PC 10 are powered on. As a result, the PC lock can be performed more quickly and reliably on the stolen PC 10.

  In step S31, instead of turning on the power, the movement between the cells is performed, so that the location registration is performed when the communication terminal 20 moves between the cells.

[Description of Third Processing Method in Remote Lock System 1]
In addition, a timer for measuring a communication time interval may be provided in the communication terminal 20 so that when the communication request from the PC 10 is not made for a certain period of time, the communication terminal 20 voluntarily makes a call request. As a result, access to the communication network 40 occurs within a certain time, and the use prohibition signal can be transmitted from the communication network 40 to the communication terminal 20.

  FIG. 5 is a flowchart showing a third processing method in the remote lock system 1 of the present invention. This flowchart shows the flow of processing in the communication terminal 20, and shows the flow of processing when the communication terminal 20 voluntarily makes a call request.

  In the flowchart shown in FIG. 5, Step S13A and Step S17A are newly added to the flowchart shown in FIG. 3, and the other processing steps are the same as those in the flowchart shown in FIG. Hereinafter, the newly added processing steps will be described.

  In step S13A, when there is no communication request from the PC 10, the communication terminal 20 starts communication with the communication network 40 when the measurement time of the communication interval measurement timer expires. . In step S17A, when communication is terminated without receiving a stop request signal from the communication network 40 (step S17), the communication interval measurement timer is restarted.

  By such a processing procedure, a timer is provided in the communication terminal 20 that measures the time during which no communication request is made by the PC 10 for a certain period of time. It is possible to make a call request to the user. Thereby, PC lock (stopping the function of PC10) can be performed to the stolen PC10 more quickly and reliably. Further, it is not necessary to periodically send a use prohibition signal from another communication terminal or base station to the stolen PC 10, and the load on the communication network 40 can be reduced.

[Description of Fourth Processing Method in Remote Lock System 1]
Furthermore, as a method of increasing the call opportunity of the communication terminal 20, it can be combined with other security functions. For example, by using a timer and setting the PC 10 to be locked after a certain period of time, and periodically accessing the communication network 40 (or a separately prepared security server or the like) through the communication terminal 20. Prepare a mechanism to update the time until PC lock. As a result, access to the communication network 40 occurs at regular time intervals, so that a use prohibition signal can be transmitted to the communication terminal 20 within a certain time period.

  FIG. 6 is a flowchart showing a fourth processing method in the remote lock system 1 of the present invention. This flowchart shows the flow of processing in the PC 10 and the communication terminal 20, and when a communication request from the PC 10 is not made, a timer is used and the PC 10 is set to be locked after a predetermined time has elapsed. It is a flowchart which shows the flow of the process in the case of doing.

  In the flowchart shown in FIG. 6, the portions surrounded by broken lines (steps S11 to S22) are common to the flowchart shown in FIG. 3, and steps S41 to S49 are newly added to the flowchart of FIG. It is. Hereinafter, with reference to the flowchart shown in FIG. 6, the flow of the processing will be described focusing on the newly added steps S <b> 41 to S <b> 49.

  The PC 10 starts counting a timer that measures the time during which the PC 10 itself has not made a communication request for a certain time (step S41). While the timer is measured, the PC 10 performs a normal operation (step 42). Next, it is determined whether or not the timer measurement time has expired (step S43). If it is determined that the timer measurement time has not expired, the process proceeds to step S41, and the PC 10 performs normal operation. Do.

  If it is determined in step S43 that the timer has expired, a call request is made to the communication terminal 20 (step S44). Thereafter, the PC 10 receives communication end information from the communication terminal 20 (step S45). When receiving the communication end information from the communication terminal 20, the PC 10 reads the key information in the communication terminal 20 and confirms the hard key function (step S46).

  Then, it is determined whether or not the PC is locked (step S47). When the key information cannot be obtained or when it is confirmed that the communication terminal 20 is in the locked state, the PC function is stopped and the PC is locked (step S48). If the PC is not locked, the timer is restarted (step S49) and the process returns to the first step S41.

  By such a processing procedure, a timer that measures the time during which the PC 10 has not made a communication request for a certain time is provided in the PC 10, and when the measurement time of this timer expires, the communication network 40 is connected via the communication terminal 20. Can make a call request. As a result, the PC lock can be performed more quickly and reliably on the stolen PC 10. In addition, it is not necessary to periodically send a use prohibition signal from another communication terminal or base station to the stolen PC 10, and the load on the communication network 40 can be reduced.

[Description of processing method on the communication network 40 side in the remote lock system 1]
Next, a processing flow on the communication network 40 side in the remote lock system 1 will be described. FIG. 7 is a flowchart showing a processing flow on the communication network 40 side in the remote lock system 1 of the present invention. Hereinafter, the processing flow will be described with reference to FIG.

  Initially, the communication network 40 is in a standby state (step S51). When a regular user receives a communication request to stop using the communication terminal 20 (step S52), the subscriber information of the communication terminal 20 of the target user is deleted from the subscriber information database 46 (step S53). . In addition to the method of deleting subscriber information from the subscriber information database 46, stop instruction information may be recorded in the subscriber information database 46 as shown in FIG.

  Thereafter, a communication request from the communication terminal 20 is detected (step S54). When there is a communication request, communication with the communication terminal 20 is started (step S55), and an authentication request is transmitted to the communication terminal 20. (Step S56), an authentication response is received from the communication terminal 20 (Step S57). In the communication network 40, based on the authentication response information received from the communication terminal 20, the subscriber information database 46 is referred to and it is determined whether the communication terminal 20 is a regular contract terminal (steps S58 and S59).

  If it is determined in step S59 that the terminal is an authorized contract terminal, the communication process is continued as it is (step S60). When the communication is completed, the communication with the communication terminal 20 is ended (step S62). If it is determined in step S59 that the terminal is not a regular contract terminal, a stop request signal is transmitted to the communication terminal 20 (step S61), and the communication process is terminated (step S62).

  As described above, the embodiment of the present invention has been described. If the PC 10 with the communication terminal 20 is left out of service area where communication with the communication network 40 is not possible, a stop request signal is transmitted from the communication network 40 to the communication terminal 20. Can not. As a security measure in this case, password information may be held in the communication terminal 20, and a password input may be requested when the PC 10 is used. As a result, when the communication terminal 20 is within a communicable area, a stop request signal is transmitted to perform PC lock, and when the communication terminal 20 is out of the area, a password input is requested to further increase security. .

  FIG. 10 is a diagram showing a hardware configuration example of a PC and a communication terminal for realizing the above operation of the remote lock system of the present invention. In FIG. 10, the description of the same components as those in FIG. 2 is omitted here. For the same reason, description of the communication network 40 is also omitted.

  The base station detection unit 28a in the control unit 21a of the communication terminal 20a is a reception state detection unit that detects the success or failure of detection of the base station, the response to the remote lock of the communication network 40, and the presence or absence of a stop request from the communication nutwork 40 29. The reception state detection unit 29 receives a command from the reception state reading unit 14 in the control unit 13a of the PC 10a, determines whether the detection of the base station is successful, the remote lock of the communication network 40, and the stop from the communication nutwork 40 Answer whether the request has been received. The reception state reading unit 14 determines the answer from the reception state detection unit 29. For example, when the communication terminal 20a has not found a base station, it is determined that the communication terminal 20a and the PC 10a are outside the communication range of the communication network 40.

  When the reception state reading unit 14 detects that the communication terminal 20a is out of the communication range or in the communication network range that does not support remote lock, the control unit 13a allows the user to be out of range or in the communication range not compatible with remote lock. Announce it, and display it on a screen to prompt you for a password. The user who has been notified that the communication area is out of the communication area or in the communication area not compatible with the remote lock uses the same password as the password stored in the password storage section 34 of the communication terminal 20a by the password output control section 16 of the PC 10a in advance. The password is input to the PC 10a by the password input unit 15 comprising authentication data input means. The input password is determined by the password input control unit 17 and the password read from the password storage unit 34 of the communication terminal 20 a by the password determination unit 18. The entered password and the stored password are compared, and if the entered password is authentic, the PC 10a performs a normal operation.

  On the other hand, if the input password is an unauthorized password, the password determination unit 18 determines that the password is an unauthorized password, and outputs the result to the PC lock function unit 12. When an illegal password input is detected from the password determination unit 18, the PC lock function unit 12 locks various operations of the PC 10a so that the PC 10a cannot be used.

  When the reception status reading unit 14 does not detect the reception of the stop request from the communication network 40, the key information 31 in the communication terminal 20 a is transmitted via the switch (SW 1) 26 and the key information control unit 24. The information is input to the key information detection unit 11 of the PC 10 a and is compared with the key information 19 in the PC 10 a by the key information determination unit 110. As a result, if the key information 19 in the PC 10a and the key information 31 in the communication terminal 20a are verified, the PC 10a performs normal operation. On the other hand, if the result of the collation is invalid, the PC lock function unit 12 disables the use of the PC 10a.

  FIG. 11 is a flowchart showing a schematic operation of the present invention in the case of out of service area. This flowchart is shown with reference to the most basic PC lock processing method in the communication terminal 20 shown in FIG.

  After the power is turned on in the communication terminal 20, a base station search is started (step S300). If a base station can be found by the base station search in step S300, normal communication is started (steps 301 and 302). If the base station is not found in step 301, or if the communication range is not compatible with remote lock, the user is prompted to input a password (step S303). When the user who is prompted to input a password inputs a predetermined password, it is determined whether or not the input password is authentic (step S304). In step S304, if the input password is valid, the PC 10 performs the normal operation as it is (step S305). On the other hand, if it is determined that the input password is not a legitimate one but an illegal one, the PC function is stopped (step S306).

  FIG. 12 is a flowchart for explaining in detail the operation shown in FIG.

  First, the PC 10a and communication terminal 20a are powered on (step S401). In the communication terminal 20a, it is determined whether or not the stop request reception flag 32 in the nonvolatile memory 30a is on (step S402). If the stop request reception flag 32 is on (ON), the switch (SW2) 27 is turned off (OFF), and the use of the subscriber data 33 is stopped (step S471). Further, the switch (SW1) 26 is turned off (OFF), the use of the key information 31 is stopped, and the hard key function is stopped (step S472). As a result, the standby state is terminated and the PC 10 is locked.

  In step S402, after the stop request reception flag 32 is determined to be off (OFF), the PC 10a starts a timer (step S403), determines whether the timer has expired (step S404), and the communication terminal receives the time up. A command for inquiring the reception state to 20a is output (step S405).

  After determining that the stop request reception flag 32 is off (OFF), the communication terminal 20a starts a base station search (step S460). In step S460, the success or failure of the base station search is determined in step S461. If the base station cannot be found, it is determined that the base station search result is unsuccessful (step S462). On the other hand, when the base station is found in step S461, it is determined that the base station search is successful (step S463). If the base station search is successful in step S463, a location registration operation is started (step S464), and it is determined whether or not the communication network of the base station that has succeeded in the search is compatible with remote lock (step S465). . If the communication network of the base station that has succeeded in the search does not support remote lock in step 464, the location registration is continued as it is (step S467), and the communication is terminated (step S468).

  On the other hand, if the communication network of the base station that has succeeded in the search supports remote lock, it is determined whether or not a stop request is received in the authentication phase (step S466). If the stop request is not received, location registration is performed. The operation is continued (step S467), and the communication is terminated (step S468). If it is determined in step S466 that a stop request has been received, communication is terminated (step S469), and the stop request reception flag 32 is turned on (step S470). Next, the switch (SW2) 27 is turned off (OFF), and the use of the subscriber data 33 is stopped (step S471). Further, the switch (SW1) 26 is turned off (OFF), the use of the key information 31 is stopped, the hard key function is stopped (step S472), the standby state is terminated, and the PC 10 is locked.

  The communication state of the communication terminal 20a shown in steps S462, S465, S468, and S472 is sequentially stored in step S450. For example, the reception state of the communication terminal 20a is “base station search unsuccessful”, “remote lock not supported”, “stop request received”, “stop request not received”. Although the base station search is described as being performed once here, it may be performed at regular intervals using a timer or the like.

  The reception state detection unit 29 of the communication terminal 20a that has input a command for inquiring the reception state from the reception state reading unit 14 of the PC 10a in step S405 (step S451) indicates the reception state of the communication terminal 20a stored in step S450. A command to answer to the PC 10a is output (step S452).

  In step S452 of the communication terminal 20a, the PC 10a that has input the reception state of the communication terminal 20a from the reception state detection unit 29 to the reception state reading unit 14 with an answer command (step S416) determines the reception state of the communication terminal 20a (step S416). S417) As a result, when it is determined that the result of the reception state is not output, the timer is reset and restarted (step S418), and the process returns to step S404.

  On the other hand, when it is determined that the command input from the communication terminal 20a has a reception result, it is determined whether the reception is successful and whether the remote lock is supported as a result of the base station search. (Step S419). In step S419, if the communication state of the communication terminal 20a is base station search unsuccessful or even if base station search is successful, if the remote lock is not supported, a display screen prompting the user to input a predetermined password The password input request is displayed on the screen (step S420). Next, the presence / absence of a password input is detected (step S421), and if the password is not input, the function of the PC 10a is stopped (step S424).

  When the password is input from the user, the password is collated with a previously stored password (step S422). If the input password is correct, the PC 10a is normally operated (step S423). On the other hand, if it is determined in step S422 that the input password is illegal compared to the stored password, the function of the PC 10a is stopped (step S424).

  If it is determined in step S419 that the communication state of the communication terminal 20a has succeeded in the base station search corresponding to the remote lock, it is next determined whether or not a stop request has been received (step S425). When the stop request is received, the function of the PC 10a is stopped (step S430). When the stop request is not received, the key information 31 is read from the communication terminal 20a, the key information 19 is read from the PC 10a (step S426), and the respective key information is inquired (step S427). As a result, when it is determined that both pieces of key information are authentic (step S428), the PC 10a is normally operated (step S429). On the other hand, if it is determined in step S429 that the key information is not authentic as a result of the collation in step S428, the function of the PC 10a is stopped (step S430).

  The configuration of the above embodiment has been described based on the embodiment of the present invention shown in FIG. 3. However, this configuration is not limited to the embodiment of the present invention shown in FIG. Needless to say, this embodiment can be similarly implemented.

  In the embodiment of FIG. 10, the password storage unit is provided in the communication terminal 20a and the password determination unit is provided in the PC 10a. However, the configuration is not limited to that in FIG.

  FIG. 13 is a hardware configuration diagram illustrating an example in which a password storage unit is provided in a PC.

  A password storage unit 111 is provided in the control unit 13b of the PC 10b. Similarly to the password storage unit 34 of FIG. 10, the password storage unit 111 stores a password in advance by a user or the like, and when the communication state reading unit 14 detects out of communication range or remote lock incompatibility, The password input from 15 is compared with the password determination unit 18.

  FIG. 14 is a hardware configuration diagram illustrating an example in which a password storage unit and a password determination unit are provided in a communication terminal.

  The communication terminal 20 c includes a password storage unit 34 and a password determination unit 200. In the password storage unit 34, a password is previously stored by a user or the like by the password output control unit 16 of the PC 10c. When the reception state detection unit 29c of the communication terminal 20c detects that the communication network outside the communication range or the detected base station communication network is not compatible with remote lock, the switch (SW1) 26c is turned off ( OFF) and the use of the key information 31 is stopped. When the switch (SW1) 26c is off (OFF), the key information control unit 24 refuses to provide key information to the key information detection unit 11 of the PC 10c, and the PC lock function unit 12 locks the PC 10c. When the communication status reading unit 14c detects that the communication state reading unit 14c is out of the communication range or the detected communication network by the base station is a communication network that does not support remote lock, the PC 10c requests the user to input a password. The password input from the password input unit 15 is output by the password output control unit 16c to the password determination unit 200 in the control unit 21c of the communication terminal 20c. The password determination unit 200 compares the input password with the password stored in the password storage unit 34. If the password is a legitimate password, the switch (SW1) 26c is turned on (ON), and the key information of the PC 10c The key information is supplied to the detection unit 11, the PC lock function unit 12 unlocks the PC 10c, and the PC 10c performs a normal operation. On the other hand, if the input password is illegal compared to the password stored in the password storage unit 34, the switch (SW1) 26c remains off (OFF) and the key information 31 is used. Stop and stop the function of the PC 10c.

  The example of controlling the remote lock of the PC 10 by inputting the password has been described above. However, as the password here, a predetermined character string input from the keyboard or biometric authentication information such as a fingerprint can be used. Furthermore, the password is not limited to the type of information, and various types of authentication information and combinations thereof can also be used.

  If the PC is stolen, the confidential information may be decrypted by removing the hard disk. Therefore, as a countermeasure in this case, the encryption key information is held in the communication terminal 20 and recorded on the hard disk using this encryption key. The information may be encrypted, and when the communication terminal 20 receives a stop request signal from the communication network 40 side, the encryption key information may be locked or deleted.

  FIG. 15 is a diagram showing a hardware configuration example of the remote lock system 1 when information to be recorded on the hard disk is encrypted. In addition, description of the part which overlaps with FIG. 2 is abbreviate | omitted here.

  The encryption key information reading unit 60 of the control unit 13d of the PC 10d is a processing unit that detects the encryption key information 34 in the communication terminal 20d. In the data storage unit 62 constituted by a hard disk or the like, the data encrypted by the data encryption unit 61 is stored according to the encryption key detected by the encryption key information reading unit 60.

  Normally, the encrypted data is decrypted by the data decryption unit 63 in accordance with the encryption key detected by the encryption key information reading unit 60 and can be used by the user.

  The communication terminal 20d includes a control unit 21d and a nonvolatile memory 30d. In the nonvolatile memory 30d, key information (key information holding means) 31, a stop request reception flag 32, subscriber data (subscriber information) 33, and encryption key information 35 are recorded.

  The transmission / reception control unit 22d in the control unit 21d is a processing unit for wirelessly transmitting / receiving data to / from the communication network. The stop request presence / absence determining unit (stop request signal presence / absence determining means) 23d determines whether or not a stop request signal (signal for instructing PC lock) is included in a signal received from the communication network 40 via the transmission / reception control unit 22d. The process which discriminates is performed.

  The stop request presence / absence determining unit 23d performs on / off control of the switch (SW1) 26, the switch (SW2) 27, and the switch (SW3) 201. In this case, when it is determined that the stop request signal is included, the switch (SW1) 26, the switch (SW2) 27, and the switch (SW3) 201 are turned off. Further, when it is determined that the stop request signal is included, the stop request presence / absence determination unit 23d performs a process of turning on the stop request reception flag 32 and determines that the stop request signal is not included. In this case, a process of turning off (OFF) is performed. At this time, encryption information may be erased.

  When the switch (SW3) 201 is off (OFF), the encryption key information control unit 202 refuses to provide the encryption key information to the PC 10d. If the switch (SW3) 201 is on, the encryption key information 35 is read and sent to the encryption key information detection unit 60 of the PC 10d.

  FIG. 16 is a flowchart showing a processing method in the remote lock system of the present invention for encrypting data. This flowchart shows the processing after the end of communication in step S18 of the flowchart shown in FIG. 3, and the other processing is the same as that in FIG. 3, so description thereof is omitted here.

  When it is determined that the communication terminal 20d has received the stop request signal from the communication network, the communication terminal 20d immediately ends the communication (step S18), and turns on the stop request reception flag 32 (step S500). The switch (SW2) 27 is turned off (OFF), and the use of the subscriber data 33 is stopped (step S501). Further, the switch (SW1) 26 is turned off (OFF), the use of the key information 31 is stopped, and the hard key function is stopped (step S502). As a result, the standby state is terminated, and the PC 10d is locked (step S22). Further, the switch (SW3) 201 is turned off (OFF), the use of the encryption key information 35 is stopped, and the decryption of the data stored in the data storage unit 52 of the PC 10d is stopped.

  With such a processing procedure, when there is a transmission request and a location registration request from the communication terminal 20d, a stop request signal, that is, a PC lock signal for stopping the function of the PC 10d can be transmitted from the communication network side. In addition, it becomes impossible to decrypt the storage data encrypted in the hard disk or the like in the PC 10d, and it is possible to improve the confidentiality of the data with respect to the stolen PC 10d.

  The embodiment of the present invention has been described above. However, the remote lock system and the communication terminal of the present invention are not limited to the above illustrated examples, and various modifications can be made without departing from the gist of the present invention. Of course, can be added. For example, the present invention is not limited to a PHS communication network, and can be implemented in a communication network using another similar wireless communication method.

  In the present invention, a PC can be locked (stopping the function of the PC) more quickly and reliably with respect to a stolen PC, and a stolen PC can be obtained from another communication terminal or base station. On the other hand, since it is not necessary to periodically transmit a use prohibition signal and the load on the communication network can be reduced, the present invention is useful for a remote lock system, a communication terminal, a remote lock method, and the like.

It is a figure for demonstrating the outline | summary of the remote lock system of this invention. It is a figure which shows the hardware structural example of the remote lock system of this invention. It is a flowchart which shows the 1st processing method in the remote lock system of this invention. It is a flowchart which shows the 2nd processing method in the remote lock system of this invention. It is a flowchart which shows the 3rd processing method in the remote lock system of this invention. It is a flowchart which shows the 4th processing method in the remote lock system of this invention. It is a flowchart which shows the flow of a process by the side of the communication network in the remote lock system of this invention. It is a figure which shows the example of a subscriber information database. It is a figure for demonstrating a communication terminal. It is a figure which shows the other hardware structural example of the remote lock system of this invention. It is a flowchart which shows the other processing method in the remote lock system of this invention. It is a flowchart which shows the other processing method in the remote lock system of this invention. It is a figure which shows the other hardware structural example of the remote lock system of this invention. It is a figure which shows the other hardware structural example of the remote lock system of this invention. It is a figure which shows the other hardware structural example of the remote lock system of this invention. It is a flowchart which shows the other processing method in the remote lock system of this invention.

Explanation of symbols

1 Remote lock system 10 PC (personal computer)
DESCRIPTION OF SYMBOLS 11 Key information detection part 12 PC lock function part 13 Control part 14 Reception state reading part 15 Password input part 16 Password output control part 17 Password input control part 18,200 Password determination part 19,31 Key information 110 Key information determination part 111, 34 Password storage unit 20 Communication terminal 21 Control unit 22 Transmission / reception control unit 23 Stop request presence / absence determination unit 24 Key information control unit 25 Subscriber data control unit 26, 27, 201 Switch 28 Base station detection unit 29 Reception state detection unit 201 Encryption Key information control unit 30 Non-volatile memory 32 Stop request reception flag 33 Subscriber data 40 Communication network 41 Control unit 42 Transmission / reception control unit 43 Stop request generation unit 44 Subscriber information control unit 45 Non-volatile memory 46 Subscriber information database 51 Base station 52 Authentication server 60 Encryption Key information reading unit 61 Data encryption unit 62 Data storage unit 63 Data decryption unit 100, 100a Communication terminal (PHS data communication card)

Claims (17)

A remote lock system comprising a PC, a communication terminal configured to be detachable or connectable to the PC, and a communication network in which the PC performs data communication via the communication terminal,
In the communication terminal,
Key information holding means for holding key information for granting operation permission to the PC;
When at least one of a call origination request and a location registration request is made to the communication network, a signal received from the communication network includes a stop request signal for instructing to stop the function of the PC A stop request signal presence / absence judging means for judging whether or not
A key information control unit that stops giving the key information to the PC when the stop request signal presence / absence determining unit determines that the stop request signal is included, and
In the PC,
Key information detecting means for detecting key information in the communication terminal;
PC lock means for continuing the operation of the PC when the key information can be obtained from the communication terminal by the key information detection means, and stopping the operation of the PC when the key information cannot be obtained,
On the communication network side, a subscriber information database that records subscriber information of communication terminals, and
When at least one of a call origination request and a location registration request is received from the communication terminal, the subscriber information database is referred to and the communication terminal is not recorded in the subscriber information database, or the subscriber information A remote lock system comprising: a stop request signal generating unit configured to generate the stop request signal and transmit the stop request signal to the communication terminal when information prohibiting the use of the communication terminal is registered in the database. . In the communication terminal,
Subscriber information holding means for holding subscriber information of the communication terminal;
A subscriber information control unit for prohibiting the use of the subscriber information when the stop request signal presence / absence determining unit determines that a stop request signal is included in the received signal from the communication network; The remote lock system according to claim 1. The remote lock system according to claim 1 or 2, wherein the stop request signal is received in the communication terminal in an authentication phase with the communication network. The communication terminal comprises means for making a location registration request to the communication network at least one of when the communication terminal is powered on or when the communication terminal moves between cells. The remote lock system according to any one of claims 1 to 3. In the communication terminal, there is provided a timer for measuring a time during which communication by the PC has not been performed for a certain time, and means for making a transmission request to the communication network when the measurement time of the timer expires The remote lock system according to any one of claims 1 to 4, further comprising: In the PC, a timer is provided for measuring a time during which the PC has not communicated for a certain period of time. The remote lock system according to any one of claims 1 to 4, further comprising: The communication terminal detects that the communication network is out of service area or the detected communication network does not support remote lock, and if the communication network is out of service area or the detected communication network does not support remote lock, the authentication information The remote lock system according to any one of claims 1 to 6, further comprising means for controlling stop of the operation of the PC by an input. The remote lock system according to any one of claims 1 to 7, wherein the communication terminal is a data communication card that is detachable from the PC. A PC, a communication terminal configured to be attachable / detachable or connectable to the PC, and having a hard key function for granting operation permission to the PC, the PC performs packet data communication via the communication terminal, and A communication network for transmitting a stop request signal for stopping the operation of the PC to the communication terminal, and the communication terminal in the remote lock system,
Key information holding means for holding key information for granting operation permission to the PC;
When at least one of a call origination request and a location registration request is made to the communication network, a signal received from the communication network includes a stop request signal for instructing to stop the function of the PC A stop request signal presence / absence judging means for judging whether or not
A communication terminal comprising: key information control means for stopping giving the key information to the PC when the stop request signal presence / absence determining means determines that the stop request signal is included. Subscriber information holding means for holding subscriber information;
A subscriber information control unit for prohibiting the use of the subscriber information when the stop request signal presence / absence determining unit determines that a stop request signal is included in the received signal from the communication network; The communication terminal according to claim 9. The communication terminal according to claim 9 or 10, wherein reception of the stop request signal from the communication network is performed in an authentication phase with the communication network. The device according to any one of claims 9 to 11, further comprising means for making a location registration request to the communication network at least one of when the power is turned on or when moving between cells. The communication terminal described in 1. A timer for measuring a time during which communication by the PC has not been performed is provided for a predetermined time, and means for making a transmission request to the communication network when the measurement time of the timer expires. The communication terminal according to any one of claims 9 to 12. The communication terminal detects that the communication network is out of service area or the detected communication network does not support remote lock, and if the communication network is out of service area or the detected communication network does not support remote lock, the authentication information The communication terminal according to any one of claims 9 to 13, further comprising means for controlling stop of the operation of the PC by an input. The communication terminal according to any one of claims 9 to 14, wherein the communication terminal is a data communication card that is detachable from the PC. A remote lock method in a remote lock system comprising a PC, a communication terminal configured to be detachable or connectable to the PC, and a communication network in which the PC performs data communication via the communication terminal. ,
By the control unit in the communication terminal,
A key information holding procedure for holding key information for granting operation permission to the PC;
When making at least one of a call origination request and a location registration request to the communication network, a signal received from the communication network includes a stop request signal instructing to stop the function of the PC A stop request signal presence / absence determination procedure for determining whether or not
A key information control procedure for stopping giving the key information to the PC when it is determined by the stop request signal presence determination procedure that the stop request signal is included;
By the control unit in the PC
A key information detection procedure for detecting key information in the communication terminal;
When the key information is obtained from the communication terminal by the key information detection procedure, the PC operation is continued, and when the key information cannot be obtained, the PC lock procedure is performed to stop the PC operation. ,
By the computer on the communication network side,
Recording subscriber information of the communication terminal in a subscriber information database;
When at least one of a call origination request and a location registration request is received from the communication terminal, the subscriber information database is referred to, the communication terminal is not recorded in the subscriber information database, or the subscription When the information prohibiting the use of the communication terminal is registered in the user information database, a stop request signal generation procedure is performed in which the stop request signal is generated and transmitted to the communication terminal. Remote lock method. A PC, a communication terminal configured to be attachable to or detachable from the PC, and a server in a communication network in which the PC performs data communication via the communication terminal,
The server refers to the subscriber information database when receiving at least one of a subscriber information database that records subscriber information of a communication terminal and a call origination request or a location registration request from the communication terminal. Is not recorded in the subscriber information database, or when information prohibiting the use of the communication terminal is registered in the subscriber information database, a stop request signal is generated and the communication terminal A communication network server comprising: a stop request signal generating means for transmitting.

Images