JP2014155149A - Behavior detection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a secure behavior detection system in which a processing load is reduced.SOLUTION: Each of a plurality of transmission devices 1 generates and transmits a pseudo-random number r on the basis of a secret key s corresponding to an identifier ID of the transmission device 1 and time t. A receiving device 2 records a plurality of pseudo-random numbers r respectively transmitted from the plurality of transmission devices 1 as recorded pseudo-random numbers and transmits a recorded pseudo-random number R in accordance with a request from an inspection device 3. The inspection device 3 requests the recorded pseudo-random number R to the receiving device 2, receives the recorded pseudo-random number R transmitted from the receiving device 2 and extracts the identifier ID of the transmission device 1 and the time t from the recorded pseudo-random number R by using a pseudo-random number table including the pseudo-random number r corresponding to the identifier ID of the transmission device 1 and the time t to detect behavior of the receiving device 2.

Description

  The present invention relates to a behavior detection system that performs behavior detection.

  In a system for recording personal actions, a mobile terminal transmits authentication information and position information and time information acquired from a satellite to a server, and the server authenticates the mobile terminal, and the position information and time A technique for recording information has been proposed (see Patent Document 1).

JP 2008-72205 A

However, the technique described in Patent Document 1 may cause a behavior to be camouflaged when a mobile terminal receives a radio wave camouflaged as position information. On the other hand, if priority is given to robustness against impersonation, the system tends to increase the processing load and make the configuration complicated.
The present invention has been made in view of the above problems, and an object thereof is to provide a secure behavior detection system with a small processing load.

  In order to achieve the above object, a first aspect of the present invention is an action detection system including a plurality of transmission devices, a reception device, and an inspection device, wherein each of the plurality of transmission devices is the transmission device. A pseudo-random number generating unit that generates a pseudo-random number based on a secret key corresponding to the identifier of the device and a time; and a pseudo-random number transmitting unit that transmits the pseudo-random number generated by the pseudo-random number generating unit, An apparatus includes: a pseudo-random number recording unit that records a plurality of pseudo-random numbers respectively transmitted by the plurality of transmission devices as recording pseudo-random numbers; and a recording pseudo-random number transmission that transmits the recording pseudo-random numbers in response to a request from the inspection device A recording pseudo-random number requesting unit that requests the recording device for the recording pseudo-random number; and a recording pseudo-random number receiving unit that receives the recording pseudo-random number transmitted by the receiving device; By using the pseudo random number table having the pseudo random number corresponding to the identifier and time of the transmitting device, and using the pseudo random number table, extracting the identifier and time of the transmitting device from the recorded pseudo random number, The gist of the invention is an action detection system including an action detection unit that detects an action of a receiving device.

  The behavior detection system according to the first aspect of the present invention further includes a stay time calculation unit that calculates a stay time of the reception device in the transmission device from the identifier and time extracted by the behavior detection unit. Can do.

  Further, in the behavior detection system according to the first aspect of the present invention, it is determined whether or not the receiving device is compatible with a predetermined condition from at least one of the identifier and time extracted by the behavior detection unit. A conformity determination unit can be further provided.

  Further, in the behavior detection system according to the first aspect of the present invention, a stay time calculation unit that calculates a stay time of the reception device in the transmission device from the identifier and time extracted by the behavior detection unit, and the transmission An allowable stay time table having an allowable stay time of the receiving device in an area corresponding to a device, and the conformity determining unit uses the stay time calculated by the stay time calculating unit to determine the allowable stay time. , It can be determined whether or not the receiving apparatus can be adapted.

  In the behavior detection system according to the first aspect of the present invention, the behavior detection system further includes an attribute information table having attribute information of each of the plurality of transmission devices, and the conformity determination unit is based on an identifier extracted by the behavior detection unit. As for the attribute information, it can be determined whether or not the receiving apparatus can be adapted.

  In the behavior detection system according to the first aspect of the present invention, the attribute information can be the importance of the area corresponding to the transmission device.

  According to the present invention, it is possible to provide a secure behavior detection system with a small processing load.

It is a typical figure explaining the composition of the action detection system concerning an embodiment of the invention exemplarily. It is a block diagram explaining the basic composition of the transmitting device with which the action detection system concerning an embodiment of the invention is provided. It is a table | surface explaining the pseudorandom numbers used for the action detection system which concerns on embodiment of this invention. It is a block diagram explaining the fundamental structure of the receiver with which the action detection system which concerns on embodiment of this invention is provided. It is a block diagram explaining the basic composition of the inspection device with which the action detection system concerning an embodiment of the invention is provided. It is a table | surface explaining the pseudorandom number table used for the action detection system which concerns on embodiment of this invention. It is a table | surface explaining the allowable stay time table used for the action detection system which concerns on embodiment of this invention. It is an example which illustrated the action of the receiver with which the action detection system concerning an embodiment of the invention is provided. It is a sequence diagram explaining basic operation | movement of the action detection system which concerns on embodiment of this invention. It is a flowchart explaining operation | movement of the transmitter with which the action detection system which concerns on embodiment of this invention is provided. It is a flowchart explaining operation | movement of the receiver with which the action detection system which concerns on embodiment of this invention is provided. It is a flowchart explaining operation | movement of the test | inspection apparatus with which the action detection system which concerns on embodiment of this invention is provided. It is a figure explaining the application example of the action detection system which concerns on other embodiment of this invention.

  Next, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals, and redundant description is omitted. However, the embodiment described below exemplifies an apparatus and method for embodying the technical idea of the present invention, and a system using these apparatuses, and is exemplified in the following embodiment. It does not specify the configuration of the apparatus, method, or system using these apparatuses. The technical idea of the present invention can be variously modified within the technical scope described in the claims.

(Behavior detection system)
As shown in FIG. 1, the behavior detection system according to the embodiment of the present invention includes a plurality of transmission devices 1-1 to 1-8, a reception device 2, and an inspection device 3. A plurality of transmission apparatuses 1-1 to 1-8 are respectively placed in correspondence with the plurality of regions _D 1 to D _8. Inspection apparatus 3 is installed in the region _{D 8.} In the following description of the behavior detection system according to the embodiment of the present invention, as shown in FIG. 1, as an example, the user enters the region D ₁ with the receiving device 2 and exits from the region D _8. I will explain it.

A plurality of transmission apparatuses 1-1 to 1-8 each have an identifier _ID 1 _{~ID 8,} the pseudo-random number _r 1 ~r ₈ wirelessly transmits. The receiving device 2 sequentially passes the regions D ₁ , D ₂ , D ₃ , D ₆ , D ₇ , D ₈ and receives pseudo-random numbers r ₁ , r ₂ , r ₃ , r ₆ , r ₇ , r ₈ in order. And record sequentially. Receiving apparatus 2, during exit region D _8, by requiring a recorded pseudorandom number from the inspection device 3 is detected the action to the inspection apparatus 3.

As illustrated in FIG. 2, each of the transmission devices 1-1 to 1-8 includes a processing unit 10 and a communication unit 11 that performs wireless communication with the outside. Each of the processing units 10 has a pseudo random number generation unit 101 and a pseudo random number transmission unit 102 as logical structures. Transmission apparatus 1-1 to 1-8 has a secret key _s 1 ~s ₈ corresponding to each identifier _ID 1 _{~ID 8,} and current time t acquired from the clock or an external device. The time t is, for example, date information. In addition, the processing unit 10 can temporarily store calculations and information necessary for processing performed by the transmission apparatuses 1-1 to 1-8.

As shown in FIG. 3, the pseudo random number generator 101 generates pseudo random numbers r _{1 to} r ₈ based on the secret keys s _{1 to} s ₈ and the current time t. For example, pseudo-random number generator 101 of the transmitting apparatus 11, and a current time t secret key s ₁ corresponding to its own identifier ID _1, using a predetermined function (hash function) h (s, t) , Pseudo random number r ₁ = h (s ₁ , t) is generated.

The pseudo random number transmission unit 102 transmits the pseudo random numbers r _{1 to} r ₈ generated by the pseudo random number generation unit 101 within a predetermined range via the communication unit 11. Since the pseudo random number generation unit 101 and the pseudo random number transmission unit 102 generate and transmit the pseudo random number r at the same time, the time t included in the pseudo random number r becomes the transmission time of the pseudo random number r. The transmission time t can be set at a predetermined interval, for example.

As illustrated in FIG. 4, the receiving device 2 includes a processing unit 20, a communication unit 21 that performs wireless communication with the outside, and a pseudo-random number recording unit 22. The receiving device 2 has an identifier N that identifies the receiving device 2. The processing unit 20 includes a pseudo-random number receiving unit 201 that receives the pseudo-random numbers r _{1 to} r ₈ transmitted by the transmitting devices 1-1 to 1-8 via the communication unit 21, a request-response processing unit 202, and a record The pseudo random number transmission unit 203 has a logical structure. In addition, the processing unit 20 can temporarily store calculations and information necessary for processing performed by the receiving device 2.

The pseudorandom number receiving unit 201 causes the pseudorandom number recording unit 22 to record the received pseudorandom numbers r _{1 to} r ₈ as needed. The pseudo random number recording unit 22 records the pseudo random numbers r _{1 to} r ₈ as the recording pseudo random number R every time the pseudo random number receiving unit 201 receives the pseudo random numbers r _{1 to} r ₈ .

  The request response processing unit 202 receives a request signal for requesting the recorded pseudorandom number R transmitted from the inspection device 3 via the communication unit 21, and the recorded pseudorandom number transmitting unit 203 requests the received request signal in response to the received request signal. Process to respond to. The recorded pseudorandom number transmission unit 203 reads the recorded pseudorandom number R recorded by the pseudorandom number recording unit 22 in accordance with the processing of the request response processing unit 202, and reads the recorded pseudorandom number R read as a response to the request from the inspection device 3. Is transmitted to the inspection device 3.

  As shown in FIG. 5, the inspection device 3 includes a processing unit 30, a communication unit 31 that wirelessly communicates with the outside, a pseudo random number table storage unit 32, an allowable stay time table storage unit 33, and an attribute information table storage unit 34. And an action recording unit 35, an input unit 36, and an output unit 37. The input unit 36 is an input device that inputs a signal output in response to a user operation, a signal output from an external device, and the like to the processing unit 30. The output unit 37 is an output device that outputs electric signals and the like for controlling external devices in addition to voice, characters, light, and images.

  The processing unit 30 includes a pseudo random number table generation unit 301, an allowable stay time table generation unit 302, a recorded pseudo random number request unit 303, a recorded pseudo random number reception unit 304, an action detection unit 305, and a stay time calculation unit 306. And a conformity determination unit 307. In addition, the processing unit 30 can temporarily store calculations and information necessary for processing performed by the inspection apparatus 3.

The pseudo random number table generation unit 301 uses a function h (s, t) from the secret keys s _{1 to} s ₈ corresponding to the identifiers ID _{1 to} ID ₈ of the transmission devices 1-1 to _1-8 and the time t. , Pseudo random number r is calculated. As shown in FIG. 6, the pseudo random number table generation unit 301 generates a pseudo random number table having identifiers ID _{1 to} ID ₈ , time t, and pseudo random numbers r corresponding to the identifiers ID _{1 to} ID ₈ and time t. To do. The pseudo random number table generated by the pseudo random number table generation unit 301 is stored in the pseudo random number table storage unit 32. The pseudo random number table stored in the pseudo random number table storage unit 32 may be acquired from the outside.

The allowable stay time table generating unit 302 has an allowable stay time having the allowable stay time of the receiving device 2 in the areas D _{1 to} D ₈ corresponding to the transmitting devices 1-1 to 1-8, respectively, based on preset conditions. Generate a table. As shown in FIG. 7, the allowable stay time table includes an allowable ID corresponding to the identifier ID _x of the transmission device 1 corresponding to the movement source region D and the identifier ID _y of the transmission device 1 corresponding to the movement destination region D. It has a stay time T _{(x, y)} (ID _x , ID _y ). For example, the allowable residence time T _{(1, 2)} shown in FIG. 7 shows a time allowed to the receiving apparatus 2 in a case of moving from region D ₁ in the region D _2.

The function for calculating the allowable stay time T _{(x, y)} or the allowable stay time T _{(x, y)} in the allowable stay time table can be appropriately set by an input from the input unit 36, for example. The allowable stay time table generated by the allowable stay time table generation unit 302 is stored in the allowable stay time table storage unit 33.

The allowable stay time table generation unit 302 may calculate the allowable stay time T _{(x, y)} using the attribute information table stored in the attribute information table storage unit 34. The attribute information table stored in the attribute information table storage unit 34 has attribute information for each of the identifiers ID _{1 to} ID ₈ of the transmission apparatuses 1-1 to 1-8. The attribute information is, for example, the importance of each of the areas D _{1 to} D ₈ corresponding to the transmission apparatuses 1-1 to 1-8.

For example, in the example shown in FIG. 1, the areas D ₄ and D ₅ are considered as areas to be warned, and the allowable stay time T _{(x (x)} in the areas D ₄ and D ₅ is used as attribute information of the transmission devices 1-4 and 1-5. _{, y)} is set to be shorter than the others. In this case, the allowable stay time table generation unit 302 reads the attribute information table stored in the attribute information table storage unit 34, and in the areas D ₄ and D ₅ according to the attribute information of the transmission devices 1-4 and 1-5. The allowable stay time T _{(x, y)} is calculated so as to be shorter than others.

  The recording pseudo random number requesting unit 303 transmits a request signal for requesting the recording pseudo random number R recorded in the pseudo random number recording unit 22 to the receiving device 2 to the receiving device 2 via the communication unit 31. The recording pseudo-random number receiving unit 304 receives the recording pseudo-random number R transmitted by the recording pseudo-random number transmitting unit 203 of the receiving device 2 in response to a request from the recording pseudo-random number requesting unit 303 via the communication unit 31.

The behavior detection unit 305 extracts identifiers ID _{1 to} ID ₈ and time t from the recorded pseudo random number R received by the recorded pseudo random number receiving unit 304 using the pseudo random number table stored in the pseudo random number table storage unit 32. Thus, the behavior of the receiving device 2 is detected. For example, in the example illustrated in FIG. 6, when the recorded pseudorandom number R received by the recorded pseudorandom number receiving unit 304 includes the pseudorandom number r = h (s ₄ , t ₀ ), the behavior detecting unit 305 determines that the identifier ID ₄ to extract a time _{t 0.} In this way, the behavior detection unit 305 extracts each identifier ID and each time t using the recorded pseudorandom number R as an index. The identifiers ID _{1 to} ID ₈ and time t extracted by the behavior detection unit 305 are recorded in the behavior recording unit 35 as behavior information.

The stay time calculation unit 306 is based on the identifiers ID _{1 to} ID ₈ extracted by the behavior detection unit 305 and the time t, and the stay time of the reception device 2 in the areas D _{1 to} D ₈ corresponding to the transmission devices 1-1 to 1-8. T _real is calculated. The stay time calculation unit 306 includes a time t _y when the transmission device 1 corresponding to the destination area D _y transmits the pseudo random number, and a time t when the transmission device 1 corresponding to the movement source area D _x transmits the pseudo random number. the difference between the _x, calculated as an area _{D x} and region _{D y} residence time of the receiving apparatus 2 in T _real.

For example, as illustrated in FIG. 8, when the receiving device 2 is in the region D ₁ corresponding to ID ₁ at time t ₀ and time t ₁ , the stay time T _real of the receiving device 2 in the region D ₁ is T _real = t ₁ −t ₀

The suitability determining unit 307 determines whether or not the receiving device 2 is compatible with a predetermined condition from at least one of the identifiers ID _{1 to} ID ₈ extracted by the behavior detecting unit 305 and the time t. For example, the suitability determination unit 307 uses the stay time T _real calculated by the stay time calculation unit 306 from the identifiers ID _{1 to} ID ₈ extracted by the behavior detection unit 305 and the time t, and the allowable stay time T _{(x, y )} For the receiving device 2 is determined. That is, the conformity determining unit 307 determines that the receiving device 2 in certain regions D _{1 to} D ₈ is conforming to the receiving device 2 when T _real <T _{(x, y)} is satisfied, and T _real ≦ When T _{(x, y)} is satisfied, it is determined that the receiving apparatus 2 is incompatible.

Alternatively, the conformity determining portion 307, from the identifier _ID 1 _{~ID 8} the action detection unit 305 extracts, for the attribute information of the transmission apparatus 1-1 to 1-8, so as to determine whether the adaptation to the receiving apparatus 2 It may be. For example, in the example illustrated in FIG. 1, it is assumed that entry to the areas D ₄ and D ₅ is prohibited as attribute information of the transmission devices 1-4 and 1-5. In this case, as shown in FIG. 8, the conformity determination unit 307 determines that the receiver 2 that has transmitted the recorded pseudorandom number R including the pseudorandom number r from which the identifier ID ₄ of the transmitter 1-4 is extracted is not suitable. judge.

  Further, the attribute information table storage unit 34 may store a different attribute information table for each identifier N of the receiving device 2. Thereby, for example, when the behavior detection system according to the embodiment of the present invention is applied to a building such as a building as a multi-hop network, an attribute information table is easily set for each user of the receiving device 2. Access for each user can be managed.

  When the conformity determination unit 307 determines that the reception device 2 is incompatible, the output unit 37 sounds an alarm, for example. In addition, the output unit 37 can control to open and close the gate or turn on a warning lamp together with an alarm according to the determination result of the conformity determination unit 307.

(Behavior detection method)
An example of a behavior detection method using the behavior detection system according to the embodiment of the present invention will be described using the sequence diagram shown in FIG. In the description of the behavior detection method below, when the receiving device 2 receives the pseudo-random numbers r _{0 to} r ₂ from the three transmission devices 1-0 to 1-2, the behavior is detected by the inspection device 3. An example will be described.

In step S1, the transmission device 1-0 generates and transmits a pseudo-random number r ₀ = h (s ₀ , t) from the secret key s ₀ corresponding to its own identifier ID ₀ and the current time t. The receiving device 2 receives and records the pseudorandom number r ₀ transmitted by the transmitting device 1-0. Similarly to step S1, in steps S2 and S3, the transmission devices 1-1 and 1-2 sequentially transmit pseudo-random numbers r ₁ and r ₂ , and the reception device 2 receives pseudo-random numbers r ₁ and r ₂ , Record.

  In step S <b> 4, the inspection device 3 requests the reception device 2 for the recorded pseudorandom number R recorded by the reception device 2. In step S <b> 5, the receiving device 2 transmits the recorded recorded pseudorandom number R to the inspection device 3 in response to a request from the inspection device 3. The inspection device 3 receives the recorded pseudorandom number R transmitted by the receiving device 2.

In step S6, the inspection apparatus 3, the recording pseudo-random number R received by extracting the identifier ID ₀ ~ID ₂ and each time t, detects the behavior of the receiving apparatus 2. The inspection device 3 determines whether or not the receiving device 2 is compatible with a predetermined condition from at least one of the extracted identifiers ID _{0 to} ID ₂ and time t.

-Operation of transmitter-
An example of the operation of the transmission device 1 provided in the behavior detection system according to the embodiment of the present invention will be described using the flowchart of FIG.

First, in step S11, the pseudo random number generation unit 101 acquires the current time t from a clock or an external device provided in the transmission device 1. In step S12, the pseudo random number generation unit 101 generates a pseudo random number r using the hash function h (s, t) from the secret key s corresponding to each identifier ID and the current time t acquired in step S11. To do. In step S <b> 13, the pseudo random number transmission unit 102 transmits the pseudo random numbers r _{1 to} r ₈ generated by the pseudo random number generation unit 101 in step S <b> 11 within a predetermined range via the communication unit 11.

-Operation of receiving device-
An example of the operation of the reception device 2 provided in the behavior detection system according to the embodiment of the present invention will be described using the flowchart of FIG.

  First, in step S <b> 21, the pseudo random number receiving unit 201 receives the pseudo random number r transmitted from the transmission device 1 via the communication unit 21. In step S21, the pseudo random number recording unit 22 records the pseudo random number r received by the pseudo random number receiving unit 201 in step S21 as a recording pseudo random number R.

  In step S <b> 23, the request response processing unit 202 determines whether or not a request signal for requesting the recorded pseudorandom number R has been received from the inspection device 3. If it is determined that the request signal has been received, the process proceeds to step S24. If it is not determined that the request signal has been received, the process returns to step S21 again, the pseudorandom number receiving unit 201 receives the pseudorandom number r, and in step S22, the pseudorandom number recording unit 22 is received in the immediately preceding step S21. The pseudorandom number r is added as a recorded pseudorandom number R.

  In step S24, the recorded pseudo-random number transmission unit 203 reads the recorded pseudo-random number R recorded by the pseudo-random number recording unit 22 in response to the request from the inspection device 3 in step S23, and the read recorded pseudo-random number R is read by the inspection device 3. Send to.

-Operation of the inspection device-
An example of the operation of the inspection apparatus 3 included in the behavior detection system according to the embodiment of the present invention will be described using the flowchart of FIG.

First, in step S31, the pseudo-random number table generating unit 301 generates a pseudo-random number table having an identifier ID, a time t, and a pseudo-random number r corresponding to the identifier ID and the time t as a preset, and the pseudo-random number table. The data is stored in the storage unit 32. In addition, the allowable stay time table generation unit 302 generates an allowable stay time table having the allowable stay time T _{(x, y)} of the receiving device 2 in the region D corresponding to the transmitting device 1 as a preset, and the allowable stay time The data is stored in the table storage unit 33. The prior setting in step S31 is omitted when it is not necessary thereafter.

  In step S <b> 32, the recording pseudorandom number requesting unit 303 requests the receiving device 2 for the recording pseudorandom number R recorded in the pseudorandom number recording unit 22. In step S <b> 33, the recording pseudorandom number receiving unit 304 receives the recording pseudorandom number R that the receiving device 2 transmits in response to a request from the recording pseudorandom number requesting unit 303. If the recorded pseudorandom number R is not received in step S33, the process returns to step S31.

  In step S34, the behavior detection unit 305 uses the pseudo-random number table stored in the pseudo-random number table storage unit 32 to obtain the identifier ID and the recorded pseudo-random number R from the recorded pseudo-random number R received by the recorded pseudo-random number receiving unit 304. The transmitted transmission time t is extracted.

In step S <b> 35, the stay time calculation unit 306 calculates the stay time T _real of the reception device 2 in the transmission device 1 area D from the identifier ID extracted by the behavior detection unit 305 and the transmission time t.

In step S _<b > 36, the suitability determining unit 307 uses the stay time T _real calculated by the stay time calculating unit 306 to determine whether the receiving device 2 is compatible with the allowable stay time T _{(x, y)} .

  According to the behavior detection system according to the embodiment of the present invention, the receiving device 2 receives the pseudo random number r from the transmitting device 1, and the inspection device 3 uses the pseudo random number table to identify the identifier ID and the pseudo value of the transmitting device 1. The transmission time t of the random number r is extracted. For this reason, the behavior detection system according to the embodiment of the present invention has a simple configuration, can conceal the behavior of the reception device 2 from others, and is secure with a small processing load.

  Further, according to the behavior detection system according to the embodiment of the present invention, various conditions can be set for the receiving device 2 using the attribute information of the transmitting device 1, and a complicated configuration can be easily constructed. It is.

(Other embodiments)
As described above, the present invention has been described according to the first and the embodiments. However, it should not be understood that the description and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

For example, in the above-described embodiment, each transmission device 1 may use the identifier ID as position information of each transmission device 1 acquired by the global positioning system (GPS). For example, as illustrated in FIG. 13, in a region where pseudorandom numbers corresponding to identifiers ID _{0 to} ID ₃ are transmitted between times t _{0 to} t ₃ , the receiving device 2 is located at positions x _{0 to} x ₃ . Suppose you move to. In this case, the action trajectory of the receiving device 2 can be mapped on the map from the recorded pseudorandom number R of the receiving device 2.

  Further, in the first and the above-described embodiments, the behavior detection system does not necessarily include the behavior detection unit 305, the conformity determination unit 307, and the like. May be provided.

  In addition to the above, the present invention includes various embodiments that are not described here, such as a configuration to which the first and the embodiments are applied. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

DESCRIPTION OF SYMBOLS 1 Transmission apparatus 2 Reception apparatus 3 Inspection apparatus 22 Pseudorandom number recording part 32 Pseudorandom number table storage part 33 Permissible stay time table storage part 34 Attribute information table storage part 101 Pseudorandom number generation part 102 Pseudorandom number transmission part 203 Recording pseudorandom number transmission part 303 Recorded pseudorandom number requesting unit 304 Recorded pseudorandom number receiving unit 305 Action detecting unit 306 Stay time calculating unit 307 Conformity determining unit

Claims (6)

A behavior detection system comprising a plurality of transmission devices, reception devices, and inspection devices,
Each of the plurality of transmitting devices is
A pseudo-random number generating unit that generates a pseudo-random number based on a secret key and time corresponding to the identifier of the transmitting device;
A pseudo-random number transmission unit that transmits the pseudo-random number generated by the pseudo-random number generation unit, and
The receiving device is:
A pseudo-random number recording unit that records a plurality of the pseudo-random numbers respectively transmitted by the plurality of transmitting devices as recording pseudo-random numbers;
A recording pseudo-random number transmission unit that transmits the recording pseudo-random number in response to a request from the inspection device,
The inspection device includes:
A recording pseudorandom number requesting unit for requesting the recording pseudorandom number to the receiving device;
A recording pseudo-random number receiving unit for receiving the recording pseudo-random number transmitted by the receiving device;
A pseudo-random number table having the pseudo-random numbers corresponding to the identifier and time of the transmitting device;
A behavior detection system comprising: a behavior detection unit that detects the behavior of the reception device by extracting the identifier and time of the transmission device from the recorded pseudo-random number using the pseudo-random number table. .   The behavior detection system according to claim 1, further comprising a stay time calculation unit that calculates a stay time of the reception device in the transmission device from an identifier and time extracted by the behavior detection unit.   2. The apparatus according to claim 1, further comprising: a conformity determination unit configured to determine whether the reception apparatus is compatible with a predetermined condition from at least one of an identifier extracted by the behavior detection unit and a time. Behavior detection system. From the identifier and time extracted by the behavior detection unit, a stay time calculation unit that calculates the stay time of the reception device in the transmission device;
An allowable staying time table having an allowable staying time of the receiving device in an area corresponding to the transmitting device;
4. The behavior according to claim 3, wherein the conformity determination unit determines whether the reception device is compatible with the allowable stay time using the stay time calculated by the stay time calculation unit. Detection system. An attribute information table having attribute information of each of the plurality of transmission devices;
The behavior detection system according to claim 3, wherein the conformity determination unit determines whether the attribute information is compatible with the receiving device from the identifier extracted by the behavior detection unit.   The behavior detection system according to claim 5, wherein the attribute information is importance of an area corresponding to the transmission device.

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