JP4224282B2 - Function control method of information communication terminal - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a function control how to control the value-added functions such as data encryption function in the information communication terminal such as a mobile phone.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, information communication terminals such as mobile phones that have a data encryption function for encrypting data using an encryption algorithm using an encryption key are known. This data encryption is executed, for example, when content data such as images, music, and programs downloaded from an information providing site on the Internet is stored in a memory card that can be attached to and detached from the information communication terminal (for example, Patent Documents). 1). Many of the content data downloaded from the above information providing sites are often protected by copyright. Therefore, by encrypting these content data and storing them in a memory card, it is possible to prevent the content data from being copied without permission or transferred to a third party and used on an external personal computer or the like. .
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-171251
[Problems to be solved by the invention]
However, there is a problem that an encryption key and an encryption algorithm used for data encryption in the information communication terminal such as the mobile phone may be decrypted. If the encryption key or encryption algorithm is decrypted in this way, even if the data is encrypted and stored in the memory card, the content data in the memory card may be illegally decrypted and used on a personal computer or the like. . Therefore, in order to prevent unauthorized use of content data due to the decryption of the encryption key, etc., it is necessary to prohibit the use of the decrypted encryption key, etc. at the same time for a plurality of information communication terminals or to replace it with another encryption key, etc. Sex came out.
Here, a method of using a communication service such as SMS (Short Messaging Service) is conceivable in order to simultaneously prohibit or replace the encryption key or the like. However, this method establishes a communication line for all of a plurality of information communication terminals and individually transmits use prohibition information such as an encryption key and switching information, which increases the load on the communication network. There's a problem.
[0005]
In recent years, in addition to the data encryption function, information communication terminals such as mobile phones having additional functions such as an imaging function such as a camera, an execution function of an application program, and a recording function are also used. It has become to. In some cases, all the information communication terminals having such value-added functions are desired to control the value-added functions all at once.
[0006]
The present invention has been made under the above background, and its object is as follows. It is an object of the present invention, without increasing the load of the communication network is to provide a function control how the information communication terminal capable of controlling a value-added function of a plurality of information communication terminals.
[0007]
[Means for Solving the Problems]
To achieve the above object, the invention of claim 1, a function control method of the information communication terminal and an information acquisition function and other value-added functions, terminal call system, for call communication network A call signal including emergency information presence / absence identification data is simultaneously transmitted to a plurality of information communication terminals via a channel, and the information providing system on the communication network side transmits the call information via the information providing channel of the communication network. The call signal received from the terminal call system on the communication network side by transmitting an information transmission signal including function control information for controlling the value-added function in the information communication terminal as the emergency information. The presence / absence of the emergency information is determined based on the presence / absence identification data included in the information communication terminal. When the information communication terminal determines that the emergency information is present, the information provision is performed via the information provision channel of the communication network. System , The function control information receives the information transmission signal including the said emergency information, the information communication terminal, based on said function control information included in the information transmission signal, the control value-added function of said information communication terminal It is characterized by doing.
Further, the invention of claim 2, in function control method of the information communication terminal 請 Motomeko 1, the value-added functionality is the ability to encrypt data by the encryption algorithm using an encryption key, the additional The control of the value function is control for switching at least one of the encryption key and the encryption algorithm.
The invention of claim 3 is the function control method of the information communication terminal according to claim 2, in the information communication terminal, and wherein the to be incorporated in advance a plurality of at least one of the encryption key and the encryption algorithm Is.
According to a fourth aspect of the present invention, in the function control method of the information communication terminal according to the first aspect, the value-added function is an imaging function, an application program execution function, or a recording function. .
[0014]
The "information communication terminal" includes a PDC (Personal Digital Cellular) method, a GSM (Global System for Mobile Communication) method, a TIA (Telecommunications Industry Association) method, etc. having an added value function such as a data encryption function. In addition to mobile phones, mobile phones standardized by IMT (International Mobile Telecommunications) -2000, PHS (Personal Handyphone Service), telephones such as car phones, etc., information communication terminals to which a mobile phone module is added are also included. In addition, the “information communication terminal” may be a mobile information communication terminal such as the mobile phone, or a fixed information communication terminal such as a fixed telephone, as long as it has the value-added function. Also good.
In addition to the data encryption function, the “value added function” includes a function for using content data such as an image, music, and an application program, an imaging function, a recording function, and the like. In addition, to use the content data, it is possible to display content data of an image such as a still image or a moving image on the display unit of the information communication terminal, or output a content of sound information such as music from the information communication terminal. included. Furthermore, starting content data of a program such as a game or a standby screen is also included. Moreover, outputting these content data from the main body of an information communication terminal to the recording medium with which the main body was mounted | worn is also included. Here, examples of the “recording medium” include an SD memory card, a CF (compact flash: registered trademark) memory card, a smart media, a memory stick, and an MMC (multimedia card).
The control in the information communication terminal can also be realized by executing a predetermined program on a computer provided in the information communication terminal. Delivery of the program used in the computer may be performed using a recording medium such as a ROM, FD, or CD-ROM in which the program is recorded as digital information, or may be performed using a communication network such as a computer network.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
The function control method according to the present embodiment is a method for simultaneously switching the encryption keys used in the data encryption processing for a plurality of information communication terminals having a data encryption processing function. The data encryption process is executed when content data downloaded for a fee from an information providing site on the Internet is transferred to a memory card. Examples of the content data include image data such as a standby screen, music data such as a ringing melody, application program data such as game software, and the like.
The simultaneous switching of the encryption key is executed at a timing when it is found that the encryption key used in common in each mobile phone is decrypted, for example. By simultaneous switching of the encryption key, unauthorized use of the content data encrypted and stored in the memory card can be prevented. The simultaneous switching of the encryption key may be periodically executed at a predetermined timing set in advance. In this case, unauthorized use of the encrypted content data stored in the memory card can be prevented.
[0016]
FIG. 1 is an explanatory diagram of a function control system for realizing the function control method of the present embodiment. This function control system is configured by using a terminal call control system 40 as terminal call control means and an information providing system 50 as information providing means.
The terminal call control system 40 is provided in a mobile phone communication network (including a wireless communication network) 70 as a communication network, and transmits terminal call signals to a plurality of mobile phones 60 through a terminal call physical channel. Since this terminal call signal has a smaller amount of data than in the case of normal message transmission, an increase in the load on the cellular phone communication network 70 can be suppressed even when it is transmitted to a large number of cellular phones all at once. The terminal call control system 40 includes, for example, a signal generation unit that generates a terminal call signal, a transmission schedule management unit that manages timing for transmitting the terminal call signal, a transmission unit, and the like. The transmission unit transmits terminal call signals all at once to all mobile phones to be called through the mobile phone communication network 70 including a base station and an exchange.
The information providing system 50 is provided in the cellular phone communication network 70, and repeatedly transmits an information transmission signal including information to be provided for each of a plurality of regions A, B, C,. It is. Since the information providing physical channel through which the information transmission signal is transmitted does not require establishment of a communication line with each mobile phone 60, an increase in the load on the mobile phone communication network information providing physical channel 70 can be suppressed. The information providing system 50 includes, for example, a database for managing information to be transmitted, a database for managing a transmission area, a transmission schedule management unit for managing information transmission timing, a reception unit, a transmission unit, and the like. The receiving unit receives information to be provided from a content provider or the like. The transmission unit transmits information to be provided via a mobile phone communication network 70 including a base station and an exchange.
The cellular phone communication network 70 includes a terminal call control system 40 and an information providing system 50, as well as a base station, an exchange, and the like.
[0017]
FIG. 2 is a sequence diagram of transmission / reception of various signals in the function control system of the present embodiment.
First, as emergency information for all mobile phones 60, an information transmission signal including function control information for switching the encryption key is repeatedly transmitted from the information providing system 50 through the “information providing physical channel”.
Next, the call control system 40 adds emergency information presence / absence identification data indicating that the information transmission signal including the emergency information is transmitted to the terminal call signal. Then, a simultaneous call is performed in which this terminal call signal is transmitted to all the mobile phones 60 simultaneously through the “terminal call physical channel”.
[0018]
The “information providing physical channel” corresponds to both a full rate structure and a half rate structure. In the case of the full rate structure, the “information providing physical channel” is arranged in the first slot (TS1) and the fourth slot (TS4) in one frame composed of six slots. Then, the cellular phone 60 performs intermittent reception at the timing at which the slot for the “information providing physical channel” is arranged, and also receives the slot for the “terminal calling physical channel” at the time of standby, Measure the reception level of the surrounding zone for transition. On the other hand, in the case of the half rate configuration, the “information providing physical channel” is arranged in the first slot (TS1) in one frame composed of 6 slots, and the cellular phone 60 is connected to the “information providing physical channel”. In this case, intermittent reception is performed at the timing at which the slot is arranged, and a slot for “terminal call physical channel” is received at the time of standby, and a peripheral zone for zone transition is measured at a time following this slot.
As the logical channel of the “information providing physical channel”, an “information channel” including character information and a “control channel” including channel configuration information of the information channel are defined. In the case of a full rate configuration, one information providing physical channel has a “control channel” in the first two frames of the superframe, an “information channel” consisting of eight frames in the following 32 frames, and a dummy slot in the last two frames. Be placed. In the case of the half-rate configuration, a “control channel” is arranged in the first two frames of the superframe, and an “information channel” consisting of an 8-frame configuration is arranged in the following 16 frames. That is, the “information channel” is retransmitted four times in the case of the full rate configuration, and is retransmitted twice in the case of the half rate configuration. By retransmitting the “information channel”, reliability is improved by error correction at the time of reception in frame assembly in the mobile phone 60. All “information providing physical channels” are, for example, arranged in a CBS hyperframe in which a total of 64 channels from the 0th to the 63rd are composed of 70 superframes or the like. In the CBS hyperframe, the 0th and 1st channels, which are emergency information channels, are repeatedly arranged four times at equal intervals, for example.
[0019]
On the other hand, the “terminal call physical channel” is also called a “broadcast channel”. An operator-specific definition area is set in an area following the information element of this “terminal call physical channel”, network number, restriction information,..., Location registration timer. In this provider-specific definition area, an extension information element length area and an extension information area are provided in order to receive the “information providing physical channel”. In the extended information element length area, the length of the information providing physical channel indicating element is set, and in the extended information area, the information providing physical channel indicating element is set. That is, the extension information length 1 (octet) is set in the extension information element length area following the information element of “terminal call physical channel”, network number, restriction information,..., Location registration timer. . In the extended information area, various identification bits are set as information providing physical channel instruction elements.
For example, the identification bits of the “information providing physical channel” are set in the fifth and fourth bits (I1 and I2) in one octet. In addition, a bit for identifying whether the “information providing physical channel” is a half-rate configuration or a full-rate configuration is set in the third bit (P1) in the one octet. Further, a bit corresponding to presence / absence identification data for identifying presence / absence of emergency information is set in the second bit (P2) in the one octet. When “I1I2” is “00”, “information provision physical channel” is not present, and when “11” is “11”, “information provision physical channel” is present. Further, when “P1” is “0”, the half rate is set, and when “P1” is “1”, the full rate is set. Further, when “P2” is “0”, there is no emergency information, and when “P2” is “1”, the emergency information is set.
When the second bit (P2) of the extension information area (1 octet) of the “terminal calling physical channel” is “1”, the mobile phone 60 determines that there is emergency information, and the “information providing physical channel” The reception of the information transmission signal transmitted on the “channel” is started.
[0020]
FIG. 3 is a block diagram of a cellular phone 60 that can switch an encryption key or an encryption algorithm used for data encryption processing in response to a signal from the function control system. The main body portion 100 of the cellular phone 60 includes a control unit 111, an internal memory 112, a wireless communication unit 113, and an antenna 114. In addition, a microphone 116 and a speaker 117 are connected to the control unit 111 through an audio processing unit 115, a display unit 119 is connected through an image processing unit 118, and a key operation unit 120 is further connected.
Further, the mobile phone is configured such that a memory card 121 as an external storage device and a USIM (User Subscriber Identity Module) 122 as a recording medium for storing user information are detachable.
[0021]
The control unit 111 includes, for example, a CPU, a cache memory, a system bus, and the like, and by executing a predetermined control program, data is transmitted to and received from each unit such as the internal memory 112 and the wireless communication unit 113. Or control. The control unit 111 also performs data encryption processing for encrypting content data using a single encryption key selected from a plurality of encryption keys stored in the internal memory 112 and a predetermined encryption algorithm. Used. Further, the control unit 111 is also used as a control unit that performs control such as reception of a terminal call signal (to be described later), reception of an information transmission signal, acquisition of function control information, and switching of an encryption key.
[0022]
The internal memory 112 is composed of a semiconductor memory such as a RAM or a ROM, and stores a control program executed by the control unit 111 and various data. The internal memory 112 is also used as content data storage means for storing content data such as images, music, and programs downloaded from information providing sites. Further, the internal memory 112 is also used as a storage unit for encryption processing data for storing a plurality of encryption keys used for the data encryption.
[0023]
The wireless communication unit 114 is controlled by the control unit 111, and performs wireless communication with the base station of the mobile phone communication network through the antenna 114 by a predetermined communication method. Through this wireless communication, voice telephone communication can be performed with a specific mobile phone or the like, and data communication such as transmission / reception of e-mails or content download from an information providing site can be performed.
The voice processing unit 115 encodes the transmission voice signal input from the microphone 116 by a predetermined method and sends the encoded signal to the control unit 111. Also, the voice processing unit 115 decodes the received voice signal received by the wireless communication unit 113 and outputs it from the speaker 117. Further, the voice processing unit 115 outputs a sound signal such as a sound effect used in an incoming melody or an application program stored in the internal memory 112 from the speaker 117.
The image processing unit 118 processes image data received by the wireless communication unit 113 and image data such as icons and menus stored in the internal memory 112, and displays the processed data on a display unit such as a liquid crystal display (LCD). .
The key operation unit 120 includes a data input key (ten key, * key, # key), a call start key, an end key, a scroll key, a multi-function key, and the like. Used for scrolling and selecting displayed information.
[0024]
The memory card 121 is detachable from a memory card slot (not shown) of the mobile phone. As this memory card 121, for example, an SD memory card can be used. In addition to this SD memory card, a CF (Compact Flash: registered trademark) memory card, smart media, memory stick, MMC (multimedia card), or the like can be used.
[0025]
The USIM 122 is composed of an IC card, for example, and is detachable from a USIM slot (not shown) of the mobile phone. The USIM 122 is issued by, for example, a mobile phone carrier, and records information on a user (mobile phone contractor) who uses the mobile phone. By attaching the USIM 122 to a mobile phone, the mobile phone can be used with a predetermined contract. Further, by using this USIM 122 by replacing it with a plurality of mobile phones having similar functions, it is possible to use the plurality of mobile phones as the same contractor.
[0026]
FIG. 4 is a flowchart showing a procedure of function control processing in the mobile phone 60 having the above-described configuration.
The terminal call signal transmitted from the terminal call control system 40 is received by all the mobile phones 60 (step 1). When the mobile phone 60 receives the terminal call signal, the content of the emergency information presence / absence identification data added to the terminal call signal is determined (step 2). If the emergency information presence / absence identification data indicates that an information transmission signal including emergency information is transmitted from the information providing system 50, the information transmission signal transmitted on the information providing physical channel is used. Receive (step 3). Then, function control information as emergency information is acquired from the received information transmission signal (step 4). Based on the function control information acquired from the information transmission signal, the encryption key used in the mobile phone 60 is switched (step 5).
[0027]
As described above, according to the present embodiment, the encryption keys used in the plurality of mobile phones 60 can be switched at the same time without increasing the load on the mobile phone communication network 70. Accordingly, it is possible to prevent unauthorized use of the content data encrypted and transferred to the memory card.
Also, according to the present embodiment, since a plurality of encryption keys are stored and incorporated in the internal memory 112 of each mobile phone 60, there is no need to receive a new encryption key when switching between encryption keys, and the communication network An increase in load can be further suppressed.
[0028]
In the above embodiment, the reception / non-reception of the information transmission signal including the function control information is switched by the terminal call signal. However, the reception / non-reception of the information transmission signal is switched regardless of the terminal call signal. May be. For example, an information transmission signal including the function control information may be received at a reception timing preset in the mobile phone 60.
[0029]
Further, although the encryption key is switched in the above embodiment, the encryption algorithm may be switched instead of or in addition to the encryption key. The present invention can also be applied to control of other value-added functions such as an imaging function such as a camera of a mobile phone, an execution function of an application program, and a recording function, and similar effects can be obtained.
[0030]
In the above embodiment, the case where the information communication terminal is a mobile phone has been described. However, the present invention can also be applied to other information communication terminals such as a PHS, a car phone, a portable personal computer, and a fixed phone. Similar effects can be obtained.
[0031]
【The invention's effect】
According to the present invention, there is an excellent effect that it is possible to control added value functions of a plurality of information communication terminals without increasing the load on the communication network .
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a function control system for implementing a function control method according to an embodiment of the present invention.
FIG. 2 is a sequence diagram of transmission / reception of various signals in the function control method.
FIG. 3 is a schematic configuration diagram of a mobile phone that switches encryption keys by the function control method.
FIG. 4 is a flowchart showing a procedure of function control processing in the mobile phone.
[Explanation of symbols]
40 terminal call control system 50 information providing system 60 mobile phone 70 mobile phone communication network 111 control unit 112 internal memory 121 memory card

Claims (4)

A function control method of the information communication terminal and an information acquisition function and other value-added functions,
A terminal call system transmits a call signal including emergency information presence / absence identification data to a plurality of information communication terminals simultaneously via a call channel of a communication network,
The information providing system on the communication network side transmits an information transmission signal including function control information for controlling the value-added function in the information communication terminal as the emergency information via the information providing channel of the communication network. Send
The information communication terminal determines the presence / absence of the emergency information based on the presence / absence identification data included in the call signal received from the terminal call system on the communication network side,
When the information communication terminal determines that the emergency information is present, the information communication terminal receives an information transmission signal including the function control information as the emergency information from the information providing system via the information providing channel of the communication network.
A function control method for an information communication terminal, characterized in that the information communication terminal controls a value-added function of the information communication terminal based on the function control information included in the information transmission signal . In function control method of the information communication terminal 請 Motomeko 1,
The above value-added function is a function of encrypting data by an encryption algorithm using an encryption key,
The function control method for an information communication terminal, wherein the control of the value-added function is control to replace at least one of the encryption key and the encryption algorithm. In the function control method of the information communication terminal of Claim 2 ,
A function control method for an information communication terminal, wherein a plurality of at least one of the encryption key and the encryption algorithm is previously incorporated in the information communication terminal.   In the function control method of the information communication terminal of Claim 1,
  A function control method for an information communication terminal, wherein the value-added function is an imaging function, an application program execution function, or a recording function.

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