JP6215675B2 - COMMUNICATION SYSTEM, COMMUNICATION METHOD, AND CLIENT DEVICE - Google Patents

Description

  The present invention relates to a technique for transmitting data.

  There is a sensor network system that collects data from sensors and measuring devices installed at remote locations. Remote meter reading, vending machine inventory management, truck delivery management, greenhouse temperature monitoring, substation equipment monitoring, structure monitoring, etc. for the purpose of improving business efficiency, improving serviceability, and ensuring safety and security Various services are being developed.

  In recent years, with the growing awareness of energy conservation even in ordinary households, the use of sensor information such as current sensors, temperature sensors, humidity sensors, illuminance sensors, human sensors, etc. Demonstration experiments are being conducted.

  A sensor is mounted on the sensor terminal, and sensor data detected by the sensor is transmitted to the server via the network. In general, sensor data is provided with a terminal ID for identifying the sensor terminal of the transmission source and attribute information indicating an attribute of the sensor data. According to Patent Document 1, a system is disclosed in which a user sensor device ID is generated from a sensor device ID and a user ID, and the user sensor device ID and sensor data are associated and managed. Here, the sensor data transmitted from the sensor device includes a sensor device ID and a device format ID indicating information on the device attribute and data format.

JP 2011-76129 A

  In the sensor network system described above, since the size of sensor data is relatively small, when sensor terminals that are widely spread and managed by the sensor network system increase, the ID area and attribute information area occupy most of the packet data as overhead. It becomes like this. In particular, when the frequency of data transmission is high, traffic on the sensor network is squeezed or power consumption required for transmission is increased.

  The present invention has been made in view of the above circumstances, and an object thereof is to improve the size of packet data.

The communication system according to claim 1 is a communication system including a client device and a server device, wherein the client device stores predetermined information, reads the predetermined information from the storage unit, A control unit that divides the predetermined information into a plurality of pieces of partial information and assigns the pieces of data to a plurality of pieces of data; and a communication unit that transmits the plurality of pieces of data to which the pieces of partial information are attached to the server device. device includes communication means for receiving said plurality of data, and each acquiring the partial information from a plurality of the received data, and reconstruction means for reconstructing to a predetermined information before division, a predetermined There are at least two pieces of information, and the control means assigns partial information of the first predetermined information and partial information of the second predetermined information to the plurality of data, respectively. A plurality of subject matter to grant the order of the partial information of the first partial information and the second predetermined information in a predetermined information are different in one of the data group and another data group of the data.

The communication system according to claim 2 is a communication system including a client device and a server device, wherein the client device stores predetermined information, and reads the predetermined information from the storage unit. A control unit that divides the predetermined information into a plurality of pieces of partial information and assigns the pieces of data to a plurality of pieces of data; and a communication unit that transmits the plurality of pieces of data to which the pieces of partial information are attached to the server device. The apparatus includes: a communication unit that receives the plurality of data; and a reconstructing unit that obtains the partial information from the received plurality of data and reconstructs the partial information into predetermined information before the division. The means changes the arrangement position of the plurality of pieces of partial information arranged in the predetermined information, and attaches each piece of partial information to the plurality of data in order in the arrangement order after the change. And it is required to.

The communication system according to claim 3 is the communication system according to claim 1 or 2, wherein the reconstructing means receives a plurality of data received at that time after the number of received data reaches a threshold value. The gist is to perform the reconfiguration using

The communication system according to claim 4 is the communication system according to any one of claims 1 to 3, wherein the predetermined information is an identifier of the client device and attribute information of the data, and the data is sensor data. It is a summary.

The communication method according to claim 5 is a communication method performed between a client device and a server device, wherein the client device stores predetermined information in a storage unit, and reads the predetermined information from the storage unit. Performing a control step of dividing the predetermined information into a plurality of pieces of partial information and assigning the pieces of data to a plurality of pieces of data, and a communication step of sending a plurality of pieces of data to which the pieces of partial information have been attached to the server device, The server device performs a communication step for receiving the plurality of data, and a reconstruction step for acquiring the partial information from the received plurality of data and reconstructing the partial information into predetermined information before division. The information is at least two, and in the control step, the partial information of the first predetermined information and the partial information of the second predetermined information are Respectively granted over data, summarized in that impart order partial information of the first partial information and the second predetermined information in a predetermined information in one data group and another data group among the plurality of data is different And

The communication method according to claim 6 is a communication method performed between a client device and a server device, wherein the client device stores predetermined information in a storage unit, and reads the predetermined information from the storage unit. Performing a control step of dividing the predetermined information into a plurality of pieces of partial information and assigning the pieces of data to a plurality of pieces of data, and a communication step of sending a plurality of pieces of data to which the pieces of partial information have been attached to the server device, The server device performs a communication step of receiving the plurality of data, and a reconstruction step of acquiring the partial information from the received plurality of data and reconstructing the partial information into predetermined information before division, and performing the control In the step, the arrangement position of the plurality of pieces of partial information arranged in the predetermined information is changed, and each piece of partial information is moved forward in the arrangement order after the change. And gist of imparting to a plurality of data.

The client device according to claim 7, a storage unit that stores predetermined information, and the predetermined information is read from the storage unit, and the predetermined information is divided into a plurality of pieces of partial information and assigned to a plurality of pieces of data. And a communication means for transmitting a plurality of data assigned with the partial information to a server device, the predetermined information is at least two, and the control means has a first predetermined information. The partial information of the information and the partial information of the second predetermined information are respectively given to the plurality of data, and the partial information of the first predetermined information in one data group and the other data group among the plurality of data The gist is that the order of provision of the partial information of the second predetermined information is different .

The client device according to claim 8, a storage unit that stores predetermined information, and the predetermined information is read from the storage unit, and the predetermined information is divided into a plurality of pieces of partial information and assigned to a plurality of pieces of data. And a communication unit that transmits a plurality of pieces of data to which the partial information is assigned to a server device, wherein the control unit arranges the plurality of partial information arranged in the predetermined information. The gist is to change the position and assign each partial information to the plurality of data in order in the arrangement order after the change .

  According to the present invention, the size of packet data can be reduced.

It is a figure showing the whole sensor network system composition concerning a 1st embodiment. It is a figure which shows the operation | movement flow of a sensor terminal. It is a figure which shows the example of a format of packet data. It is a figure which shows the operation | movement flow of a management server. It is a figure which shows the example of registration of sensor information. It is a figure which shows the example of a format of the packet data which concerns on 2nd Embodiment. It is a figure which shows the example of a format of the packet data which concerns on 3rd Embodiment. It is a figure which shows the example of a format of the packet data which concerns on 4th Embodiment. It is a figure which shows the whole structure of the sensor network system which concerns on 5th Embodiment. It is a figure which shows the operation | movement flow of a management server.

  Hereinafter, an embodiment for carrying out the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a diagram showing an overall configuration of a sensor network system 1 according to the first embodiment. The sensor network system 1 includes a sensor terminal 100 that transmits sensor data measured by a sensor, and a management server 300 that manages sensor data received via the network 500.

  First, the function of the sensor terminal 100 will be described. The sensor terminal 100 includes a sensor 11, a control unit 12, a communication unit 13, and a data storage unit 14.

  The data storage unit 14 stores a terminal ID for uniquely identifying the sensor terminal 100, attribute information indicating the attribute of the sensor data, and preliminary information for use in various additional functions. The attribute information is, for example, information such as the type of sensor, the country or place where the sensor data is generated, and the business operator. The preliminary information is, for example, an authentication code for sensor data.

  The sensor 11 measures, detects, and detects current, temperature, and the like, and outputs the measured physical quantity data to the control unit 12 as sensor data. For example, a current sensor, a temperature sensor, a humidity sensor, an illuminance sensor, a human sensor, and the like.

  The control unit 12 acquires the terminal ID, the attribute information, and the preliminary information from the data storage unit 14, divides each bit string into a plurality of fragment data, and assigns each of the plurality of sensor data measured by the sensor 11 To do.

  The communication unit 13 transmits, to the management server 300, packet data in which each piece of data including the terminal ID, attribute information, and preliminary information is added to the sensor data.

  Next, functions of the management server 300 will be described. The management server 300 includes a communication unit 31, a packet storage unit 32, an ID reconstruction unit 33, a data authentication unit 34, and a sensor information database 35.

  The communication unit 31 sequentially receives a plurality of packet data transmitted from the sensor terminal 100 and accumulates them in the packet accumulation unit 32 in time series.

  The ID reconstruction unit 33 sequentially acquires packet data from the packet storage unit 32, and reconstructs (reconstructs) the terminal ID, attribute information, and preliminary information from each piece of fragment data in each packet data.

  The data authentication unit 34 authenticates the validity of the received packet data using the reconstructed preliminary information.

  The sensor information database 35 stores packet data whose validity is authenticated as sensor information of the sensor terminal 100.

  Next, the operation of the sensor network system 1 will be described. In this operation example, the terminal ID data length is 32 bits, the attribute information data length is 24 bits, and the spare information data length is 16 bits.

  First, the operation of the sensor terminal 100 will be described. FIG. 2 is a diagram illustrating an operation flow of the sensor terminal 100.

  First, in step S <b> 101, the sensor 11 measures current, temperature, and the like, and the control unit 12 receives sensor data SIG measured by the sensor 11. Hereinafter, it is assumed that the first sensor data SIG1 to the nth sensor data SIGn (n: natural number) are received.

  Next, in step S102, the control unit 12 acquires the terminal ID, the attribute information, and the preliminary information from the data storage unit 14, and divides each into a plurality of pieces of fragment data. For example, the terminal ID is divided into 32 pieces of fragment data ID_b1 to ID_b32 in units of 1 bit, the attribute information is similarly divided into 24 pieces of piece of data P_b1 to P_b24 in units of 1 bit, and the spare information is also formed in units of 1 bit. Is divided into 16 pieces of fragment data R_b1 to R_b16.

  Next, in step S103, the control unit 12 performs the terminal ID fragment data ID_b, the attribute information fragment data P_b, and the spare information fragment data for the first sensor data SIG1 to the nth sensor data SIGn. R_b, respectively, to construct a plurality of packet data.

  Specifically, first, the 32-bit fragment data ID_b32 that is the most significant bit of the terminal ID is assigned to the first sensor data SIG1, and then the 24th bit that is the most significant bit of the attribute information. Fragment data P_b24 is added, and subsequently, 16th bit fragment data R_b16 which is the most significant bit of the preliminary information is added.

  Subsequently, the fragment data ID_b31 of the 31st bit that is the next upper bit of the terminal ID is assigned to the second sensor data SIG2, and the fragment data P_b23 of the 23th bit that is the next upper bit of the attribute information is subsequently added. Further, the 15th bit fragment data R_b15, which is the next higher order bit of the preliminary information, is added.

  Subsequently, the same processing is executed for the third sensor data SIG3 to the nth sensor data SIGn. After the least significant bit fragment data is added, the most significant bit fragment data is added. For example, regarding the preliminary information, the 16th bit fragment data R_b16 which is the most significant bit is assigned to the seventeenth sensor data SIG17.

  Finally, in step S104, the communication unit 13 transmits to the management server 300 packet data in which each piece of fragment data including the terminal ID, the attribute information, and the preliminary information is added to the sensor data SIG. A plurality of packet data is received by the management server 300 via the network 500. The format of the packet data at this time is shown in FIG. In FIG. 3 and FIGS. 5 to 8 to be described later, reference numerals are shown in parentheses.

  Next, the operation of the management server 300 will be described. FIG. 4 is a diagram illustrating an operation flow of the management server 300.

  First, in step S <b> 301, the communication unit 31 sequentially receives the first packet data to the n-th packet data transmitted from the sensor terminal 100 and temporarily stores them in the packet storage unit 32.

  Next, in step S302, the ID restructuring unit 33 sequentially acquires the first packet data to the nth packet data from the packet storage unit 32, and uses the reconstruction guide information that defines a method for restructuring. Based on each piece of fragment data included in each packet data, each bit string pattern of terminal ID, attribute information, and preliminary information is reconstructed.

  Specifically, referring to the reconstruction guide information, 1-bit fragment data relating to the terminal ID included in each of the first packet data to the n-th packet data is cut out, and fragment data ID_b32 to fragment data ID_b1 are extracted. Reconstruct as a repeated bit string. The attribute information and the preliminary information are reconstructed by performing the same processing. Note that the most construction guide information defines the data length of the terminal ID, the number of bits of each piece of fragment data, the position of the terminal ID, etc. in the packet data.

  Next, in step S303, the ID reconstruction unit 33 extracts the terminal ID, the attribute information, and the preliminary information from each reconstructed bit string pattern.

  Next, in step S304, the data authentication unit 34 determines whether the extracted preliminary information (the authentication code in this operation example) matches the authentication code registered in the management server 300 (OK) or not (NG). Determine.

  Finally, in step S305, when the determination result is OK, the data authentication unit 34 uses the sensor data included in the first packet data to the nth packet data as sensor information, and the terminal ID and attribute information. And the preliminary information are registered in the sensor information database 35. An example of the database is shown in FIG. On the other hand, if the determination result is NG, in step S306, it is regarded as invalid data and the associated packet data is discarded.

  The sensor network system 1 has been described above. The fragment data may be 2 bits or more, or a different number of bits may be used among the terminal ID, the attribute information, and the spare information. Further, the data lengths of the terminal ID, the attribute information, and the preliminary information may be the same among them. Further, the number of bits and the data length may be set in advance, or may be set in the sensor terminal 100 locally using a setting device, or a setting message transmitted from an external server May be set remotely.

[Second Embodiment]
Next, a second embodiment will be described. As shown in FIG. 6, in this embodiment, each piece of fragment data of each bit string of terminal ID, attribute information, and preliminary information is serially assigned to each sensor data SIG.

  Specifically, for example, terminal data fragment data ID_b32 to ID_b1 are assigned to 32 pieces of sensor data SIG from the beginning. Then, the pieces of preliminary data fragment data R_b16 to R_b1 are assigned to the next 16 pieces of sensor data SIG. Further, attribute data fragment data P_b24 to P_b1 are assigned to the next 24 sensor data SIG, respectively.

  That is, in the present embodiment, one piece of fragment data is assigned to one sensor data, and each piece of fragment data of the same information is continuously assigned to a plurality of continuous sensor data.

  Note that processing procedures other than those described above are the same as those in the first embodiment. Whether to fragment in parallel as in the first embodiment or in serial as in the present embodiment can be set in advance. You may set to the sensor terminal 100 locally using a setting device, and you may set remotely by the setting message transmitted from an external server.

[Third Embodiment]
Next, a third embodiment will be described. As shown in FIG. 7, in the present embodiment, each piece of fragment data of each bit string of terminal ID, attribute information, and preliminary information is given to each sensor data SIG so as to be random or nested.

  Specifically, for example, for the first 16 pieces of sensor data SIG, terminal ID fragment data is assigned, followed by preliminary information fragment data, followed by attribute information fragment data. Is granted. Then, for the next eight pieces of sensor data SIG, the attribute information fragment data is added, followed by the terminal ID fragment data, followed by the preliminary information fragment data. . Further, the next eight pieces of sensor data SIG are assigned with terminal ID fragment data, followed by preliminary information fragment data, and subsequently attribute information fragment data. To do.

  That is, in the present embodiment, the order in which each piece of fragment data is assigned to the terminal ID, attribute information, and spare information and the arrangement position in the packet data are random or nested. The order of grant can be set in advance. You may set to the sensor terminal 100 locally using a setting device, and you may set remotely by the setting message transmitted from an external server.

[Fourth Embodiment]
Next, a fourth embodiment will be described. As shown in FIG. 8, in this embodiment, in the first to third embodiments, each piece of bit data of each bit string of terminal ID, attribute information, and preliminary information is added, and dummy information Data (dummy packet) is inserted or substituted. For example, 1-bit empty data or random value data is inserted.

  Specifically, for example, for the first 16 pieces of sensor data SIG, terminal ID fragment data is assigned, followed by dummy information data, and then attribute information fragment data. Give. Then, for the next eight pieces of sensor data SIG, the attribute information fragment data is added, followed by the terminal ID fragment data, followed by the preliminary information fragment data. . Further, the next eight pieces of sensor data are provided with terminal ID fragment data, followed by preliminary information fragment data, and subsequently dummy information data.

  That is, in this embodiment, dummy data irrelevant to the terminal ID or the like is added to the sensor data SIG. The giving position can be set in advance. You may set to the sensor terminal 100 locally using a setting device, and you may set remotely by the setting message transmitted from an external server.

  According to the present embodiment, since dummy data is given, it is difficult to decipher the terminal ID, attribute information, and preliminary information even when intercepted by a malicious third party, and the confidentiality of the data is increased. improves.

[Fifth Embodiment]
Next, a fifth embodiment will be described. As shown in FIG. 9, the management server 300 according to the present embodiment further includes a packet number calculation unit 36 that counts the number of received packets. Hereinafter, the operation of the management server 300 will be described. FIG. 10 is a diagram showing an operation flow of the management server 300 in the present embodiment.

  First, in step S <b> 501, the communication unit 31 receives packet data transmitted from the sensor terminal 100 and temporarily stores it in the packet storage unit 32.

  Next, in step S502, the packet number calculation unit 36 counts the number of packet data received so far.

  In step S503, the packet number calculation unit 36 determines whether the count value of the number of packet data has reached a preset specified value (OK) or not (NG). And when the determination result is OK, it progresses to step S503 and performs step S503-step S507. Each process of step S503 to step S507 is the same operation as step S302 to step S306.

  On the other hand, if the determination result is NG, the process returns to step S501, and steps S501 to S502 are repeatedly executed until the number of received packet data reaches a specified value.

  According to the present embodiment, the terminal ID and the like are reconstructed at the timing when the number of received packet data reaches the specified value. Therefore, even when the data transmission cycle is long to some extent, the terminal ID and the attribute are appropriately timed. Information and preliminary information can be extracted.

[Sixth Embodiment]
Next, a sixth embodiment will be described. In the present embodiment, the position of each bit constituting each bit string of the terminal ID, the attribute information, and the preliminary information is randomly changed and then divided and added to the sensor data.

  In the third embodiment, the example in which the assignment order and the arrangement position of the terminal ID, the attribute information, and the preliminary information are changed so as to be random or nested is described, but in this embodiment, the bit string that forms the terminal ID The position of each bit is changed randomly. The same applies to attribute information and preliminary information.

  Such randomization can be performed by, for example, a scramble process. The scrambler can be realized by applying, for example, an M-sequence generator or a Gold sequence generator that generates a pseudo-random sequence. Hereinafter, a randomizing method will be described.

  First, the sensor terminal 100 performs an exclusive OR (XOR) with a pseudo-random sequence for each bit string of the terminal ID, attribute information, and spare information, and pseudo-randomly changes the position of each bit in the bit string. After that, the data is divided into fragment data, each fragment data is assigned to the sensor data in the order of the changed position, and the packet data is transmitted to the management server 300.

  Thereafter, after receiving the packet data, the management server 300 reconstructs and extracts each bit string of the terminal ID, the attribute information, and the preliminary information. Then, for each bit string, XOR is performed with the same pseudo-random sequence as that used in the sensor terminal 100, and the randomized data sequence is restored by performing a descrambling process.

  Note that the initial value of the register in the scrambler process is reset when, for example, the counter reaches a set value, and is synchronized between the sensor terminal 100 and the management server 300. This set value may be set locally in the sensor terminal 100 using a setting device, or may be set remotely by a setting message transmitted from an external server.

  According to the present embodiment, since the position of the bits constituting each bit string of the terminal ID, the attribute information, and the preliminary information is randomly changed, even if it is intercepted by a malicious third party The terminal ID, the attribute information, and the preliminary information are difficult to decipher, and the confidentiality of the data is improved.

  The embodiments have been described above.

  As described above, according to each embodiment, the terminal ID, the attribute information, and the preliminary information are divided into a plurality of pieces, and each piece of fragment data is assigned to the sensor data to construct packet data. Can be reduced. As a result, even when the number of sensor terminals to be managed is enormous and packet data is frequently transmitted, it is possible to reduce the power consumption required for transmission without imposing a load on the traffic of the network 500. Become.

  Finally, the sensor terminal 100 and the management server 300 described in this embodiment can be realized by a computer having a memory and a CPU. In addition, each operation of the sensor terminal 100 and the management server 300 can be constructed as a program, installed in a computer and executed, or distributed via a communication network.

1. Sensor network system (communication system)
100: Sensor terminal (client device)
DESCRIPTION OF SYMBOLS 11 ... Sensor 12 ... Control part 13 ... Communication part 14 ... Data storage part 300 ... Management server (server apparatus)
DESCRIPTION OF SYMBOLS 31 ... Communication part 32 ... Packet storage part 33 ... ID reconstruction part 34 ... Data authentication part 35 ... Sensor information database 36 ... Packet number calculation part 500 ... Network ID_b ... Fragment data (fragment bit) of terminal ID
P_b: Attribute information fragment data (fragment bit)
R_b: Preliminary information fragment data (fragment bit)
SIG ... sensor data S101 to S104, S301 to S306, S501 to S507 ... step

Claims (8)

In a communication system including a client device and a server device,
The client device is
Storage means for storing predetermined information;
A control unit that reads the predetermined information from the storage unit, divides the predetermined information into a plurality of pieces of partial information, and assigns them to a plurality of pieces of data;
Communication means for transmitting a plurality of data given the partial information to the server device,
The server device
Communication means for receiving the plurality of data;
Reconstructing means for obtaining the partial information from the plurality of received data and reconstructing the partial information into predetermined information before the division ,
The predetermined information is at least two,
The control means assigns the partial information of the first predetermined information and the partial information of the second predetermined information to each of the plurality of data,
A communication system characterized in that the order in which the partial information of the first predetermined information and the partial information of the second predetermined information are applied differs between one data group and another data group of the plurality of data . In a communication system including a client device and a server device,
The client device is
Storage means for storing predetermined information;
A control unit that reads the predetermined information from the storage unit, divides the predetermined information into a plurality of pieces of partial information, and assigns them to a plurality of pieces of data;
Communication means for transmitting a plurality of data given the partial information to the server device,
The server device
Communication means for receiving the plurality of data;
Reconstructing means for obtaining the partial information from the plurality of received data and reconstructing the partial information into predetermined information before the division,
The control means includes
A communication system, wherein an arrangement position of the plurality of pieces of partial information arranged in the predetermined information is changed, and each piece of partial information is sequentially assigned to the plurality of data in the changed arrangement order. The reconstruction means includes
The communication system according to claim 1, wherein the reconfiguration is performed using a plurality of data received at that time after the number of received data reaches a threshold value. The communication system according to claim 1, wherein the predetermined information is an identifier of the client device and attribute information of the data, and the data is sensor data. In a communication method performed between a client device and a server device,
The client device is
A storage step for storing predetermined information in a storage means;
A control step of reading the predetermined information from the storage means, dividing the predetermined information into a plurality of pieces of partial information, and assigning the plurality of pieces of data respectively;
A communication step of transmitting a plurality of data provided with the partial information to the server device,
The server device
A communication step of receiving the plurality of data;
Obtaining each of the partial information from the plurality of received data, reconstructing the predetermined information before the division, and
The predetermined information is at least two,
In the control step, the partial information of the first predetermined information and the partial information of the second predetermined information are respectively given to the plurality of data,
A communication method characterized in that the order of provision of partial information of the first predetermined information and partial information of the second predetermined information differs between one data group and another data group of the plurality of data. In a communication method performed between a client device and a server device,
The client device is
A storage step for storing predetermined information in a storage means;
A control step of reading the predetermined information from the storage means, dividing the predetermined information into a plurality of pieces of partial information, and assigning the plurality of pieces of data respectively;
A communication step of transmitting a plurality of data provided with the partial information to the server device,
The server device
A communication step of receiving the plurality of data;
Obtaining each of the partial information from the plurality of received data, reconstructing the predetermined information before the division, and
In the control step,
A communication method, wherein an arrangement position of the plurality of pieces of partial information arranged in the predetermined information is changed, and each piece of partial information is sequentially given to the plurality of data in the changed arrangement order. Storage means for storing predetermined information;
A control unit that reads the predetermined information from the storage unit, divides the predetermined information into a plurality of pieces of partial information, and assigns them to a plurality of pieces of data;
Communication means for transmitting a plurality of data provided with the partial information to a server device,
The predetermined information is at least two,
The control means assigns the partial information of the first predetermined information and the partial information of the second predetermined information to each of the plurality of data,
The client apparatus, wherein the order of provision of the partial information of the first predetermined information and the partial information of the second predetermined information differs between one data group and the other data group among the plurality of data. Storage means for storing predetermined information;
A control unit that reads the predetermined information from the storage unit, divides the predetermined information into a plurality of pieces of partial information, and assigns them to a plurality of pieces of data;
Communication means for transmitting a plurality of data provided with the partial information to a server device,
The control means includes
A client apparatus, wherein the arrangement position of the plurality of pieces of partial information arranged in the predetermined information is changed, and each piece of partial information is given to the plurality of data in order in the changed arrangement order.

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