JP4395144B2 - Data creation time certification system - Google Patents

Description

  The present invention relates to a time stamp technique used for performing time certification for content data.

  When a picture is taken with a portable terminal capable of taking a picture, the time is usually stored together with the created picture data. However, since this time is based on the time of a clock built in the portable terminal, it is easy for the user to intentionally manipulate and tamper with the time.

  In order to prevent such tampering, there is a time stamp technology as a technology for performing time certification on content data such as photographs and sounds created by a computer (see Patent Documents 1 and 2). According to this time stamp technology, it is possible to prove that the content data existed at a specific time, and it is also possible to prove that the data has not been changed after that time.

JP 2003-16028 A

JP 2000-305007 A

  However, the time stamp techniques of Patent Documents 1 and 2 merely indicate that the content data existed at a specific time, and do not prove that the data was created immediately before the time stamp time. There is a problem that the accuracy of time certification is low. That is, in these conventional techniques, since a time stamp time is added to the created content data afterwards, it is impossible to prove when the content data was created.

  An object of the present invention is to provide a data creation time certification system that can solve the above problems and can prove the creation time of content data with high reliability and accuracy.

(1)-(5) (22) The data creation time certification system according to the present invention includes:
A data creation time certification system in which a terminal device provided with a data creation program, a data creation time certification server, and a time stamp server that issues a time stamp are connected via a network,
The terminal device is
Communication start means for starting communication with the data creation time certification server;
First time measuring means for measuring, as a first time, a time from when a communication start response is received from the data creation time certification server to when the data creation program is activated;
Feature data transmission means for transmitting at least feature data of content data generated by the data creation program to the data creation time certification server,
Second time measuring means for measuring the time from the end of the data creation program to the start of transmission by the feature data transmitting means as the second time;
A measurement time transmitting means for transmitting the first time and the second time to a data creation time certification server;
With
The data creation time certification server is
Third time measuring means for measuring, as a third time, a time from when the communication start request is received from the terminal device to at least receiving the feature data from the terminal device;
Feature data transfer means for transmitting feature data received from the terminal device to a time stamp server;
A time stamp receiving means for receiving a time stamp for the characteristic data transmitted by the characteristic data transferring means from the time stamp server;
A fourth time measuring means for measuring a time from when the characteristic data is transmitted to the time stamp server until the time stamp is received from the time stamp server as a fourth time;
With
The time stamp server is
Time stamp generating means for generating a time stamp including a time stamp time for the feature data received from the data creation time certification server,
A time stamp transmitting means for transmitting a time stamp to the data creation time certification server;
In the data creation time certification system with
The data creation time certification server is
A first time and a second time received from the terminal device; a third time measured by the third time measuring means; a fourth time measured by the fourth time measuring means; Data creation time proof generating means for generating a data creation time proof based on the time stamp time received from the time stamp server;
With
It is characterized by that.

  Accordingly, it is possible to provide a data creation time system that can prove the creation time with high reliability and accuracy for content data such as photographs.

(6) The data creation time certification system of the present invention is:
The data creation time is composed of a data creation start time and a data creation end time,
The data creation time proof generating means is
The data creation start time is calculated by subtracting the third time and the fourth time from the time stamp time, and further adding the first time,
Calculating the data creation end time by subtracting a second time from the time stamp time;
It is characterized by that.

  Accordingly, it is possible to provide a data creation time system that can prove the creation time with higher reliability and accuracy for content data such as photographs.

(7) The data creation time certification system of the present invention is:
The measurement of the second time is started when the process of creating the content data is performed by the data creation program.
It is characterized by that.

  As a result, it is possible to generate a content creation time certificate that accurately calculates the content creation end time.

(8) The data creation time certification system of the present invention is:
There are a plurality of content data generated by the data creation program,
The second time measuring means measures, for each content data, the time from when the data creation program created each content data until the start of transmission by the feature data transmitting means as the second time.
It is characterized by that.

  Thereby, it is possible to generate a content creation time proof generation in which the content creation end time is accurately calculated for each of the plurality of content data.

(9) The data creation time certification system of the present invention is:
The feature data transmission means transmits only the feature data of the content data generated by the data creation program to the data creation time certification server;
It is characterized by that.

  Thereby, the content creation time certificate can be generated quickly.

(10) The data creation time certification system of the present invention is:
The feature data transmitting means transmits an identification number of the terminal device together with the feature data;
It is characterized by that.

  As a result, it is possible to generate content creation time certification generation that identifies the terminal device.

(11) The data creation time certification system of the present invention is:
The feature data transmitting means transmits location information of the terminal device together with the feature data;
It is characterized by that.

  As a result, it is possible to generate content creation time certification generation that specifies the position of the terminal device that generated the content data.

(12) The data creation time certification server of the present invention is:
Communication start means for starting communication with the data creation time certification server;
First time measuring means for measuring, as a first time, a time from when a communication start response is received from the data creation time certification server to when the data creation program is activated;
Feature data transmission means for transmitting at least feature data of content data generated by the data creation program to the data creation time certification server,
Second time measuring means for measuring the time from the end of the data creation program to the start of transmission by the feature data transmitting means as the second time;
A measurement time transmitting means for transmitting the first time and the second time to a data creation time certification server;
A data creation time certification server connected via a network to a terminal device equipped with a data creation program,
The data creation time certification server is
Third time measuring means for measuring, as a third time, a time from when the communication start request is received from the terminal device to at least receiving the feature data from the terminal device;
Time stamp generation means for generating a time stamp including a time stamp time for the feature data received from the terminal device,
Data creation based on the first time and the second time received from the terminal device, the third time measured by the third time measuring means, and the time stamp time received from the time stamp server Data creation time proof generating means for generating time proof,
With
It is characterized by that.

  As a result, the data creation time certificate can be generated by only one server having the time stamp server function.

(13)-(15) (23) The data creation time certification system of the present invention includes:
A data creation time certification system in which a terminal device having a content data creation function, a data creation time certification server, and a time stamp server that issues a time stamp are connected via a network,
The terminal device
Communication start means for starting communication with the data creation time certification server;
Content data creation means for creating content data;
Feature data transmission means for creating feature data of the content data and transmitting the created feature data of the content data to the data creation time certification server;
The timestamp server is
A time stamp generating means for receiving a request from the data creation time certification server and generating a time stamp including a time stamp time;
A time stamp transmitting means for transmitting a time stamp to the data creation time certification server,
The data creation time certification server is:
Communication starting means for starting communication with the terminal device;
Feature data transfer means for receiving feature data from the terminal device and transferring it to the time stamp server;
A time stamp receiving means for receiving a time stamp from a time stamp server;
A third time measuring means for measuring, as a third time, a time from a communication start related time related to the start of communication by the communication start means to a feature data generation related time related to the feature data reception by the feature data transfer means;
Data with the time after the time obtained by subtracting the third time from the time stamp time by the received time stamp as the data creation start time, and with the time before the time stamp time and after the data creation start time as the data creation end time A data creation time certificate generating means for generating a creation time certificate;
It is provided with.

  Thereby, it is possible to generate a data creation time proof in consideration of at least the third time.

(18) The data creation time certification system of the present invention is:
The terminal device
First time measuring means for measuring, as a first time, a time from when the communication start is related to when the data creating means can create content data;
A measurement time transmitting means for transmitting the first time to a data creation time certification server;
The data creation time certification generating means of the data creation time certification server subtracts the third time from the time stamp time and sets the time obtained by adding the first time as the data creation start time.

  Thereby, the data creation time proof considering the first time can be generated.

(19) The data creation time certification system of the present invention is:
The terminal device
A second time measuring means for measuring the time from when the data creating means completes the creation of the content data to when the feature data is related to the second time,
A measurement time transmitting means for transmitting the second time to the data creation time certification server;
The data creation time certification generating means of the data creation time certification server has a data creation end time that is a time obtained by subtracting a second time from the timestamp time.
It is characterized by that.

  Thereby, the data creation time proof considering the second time can be generated.

(20) The data creation time certification system of the present invention is:
A fourth time measuring means for measuring a time from when the time stamp receiving means makes a request until the time stamp is received as a fourth time;
The data creation time proof generating means subtracts a fourth time from the calculated data creation start time to obtain a data creation start time.
It is characterized by that.

  Thereby, the data creation time proof considering the fourth time can be generated.

(21) The data creation time certification system of the present invention is:
The data creation certification server is
Providing proof completion data transmitting means for transmitting proof completion data to the terminal device when generating the data creation time proof,
The terminal device is
A certified content data generation unit is provided for synthesizing the received certification completion data and the content data to generate certified content data.

  This makes it possible to easily provide certified content data to a third party.

(24) (25) The data creation time certification verification system according to the present invention includes:
A data creation time certification verification system in which a terminal device provided with a data creation program, a data creation time certification server, a time stamp server that issues a time stamp, and a data creation time validation terminal are connected via a network. ,
The terminal device is
Communication start means for starting communication with the data creation time certification server;
First time measuring means for measuring, as a first time, a time from when a communication start response is received from the data creation time certification server to when the data creation program is activated;
Feature data transmission means for transmitting at least feature data of content data generated by the data creation program to the data creation time certification server,
Second time measuring means for measuring the time from the end of the data creation program to the start of transmission by the feature data transmitting means as the second time;
A measurement time transmitting means for transmitting the first time and the second time to a data creation time certification server;
With
The data creation time certification server is
Third time measuring means for measuring, as a third time, a time from when the communication start request is received from the terminal device to at least receiving the feature data from the terminal device;
Feature data transfer means for transmitting feature data received from the terminal device to a time stamp server;
A time stamp receiving means for receiving a time stamp for the characteristic data transmitted by the characteristic data transferring means from the time stamp server;
A fourth time measuring means for measuring a time from when the characteristic data is transmitted to the time stamp server until the time stamp is received from the time stamp server as a fourth time;
A first time and a second time received from the terminal device; a third time measured by the third time measuring means; a fourth time measured by the fourth time measuring means; Data creation time proof generating means for generating a data creation time proof based on the time stamp time received from the time stamp server;
With
The time stamp server is
Time stamp generating means for generating a time stamp including a time stamp time for the feature data received from the data creation time certification server,
A time stamp transmitting means for transmitting a time stamp to the data creation time certification server;
In the data creation time certification verification system with
The data creation time verification terminal is
Content data transmitting means for transmitting at least content data to the data creation time certification server;
Verification result display means for displaying the verification result received from the data creation time certification server;
With
The data creation time certification server is
Feature data verification means for calculating feature data from the content data received from the data creation time certification verification terminal and comparing and comparing with the feature data of the data creation time certification;
Verification result transmission means for transmitting the result of comparing the feature data to the data creation time verification terminal together with the data creation time proof,
With
It is characterized by that.

  Thereby, the verifier can verify the reliable time at which the content is considered to be created together with the presence or absence of falsification of the image data.

  In this embodiment, “data creation time certification” refers to data for certifying the time at which content data was created within a certain time interval, calculated based on a time stamp time. Specifically, The data stored in the data creation time certificate storage table 52b shown in FIG.

  In this embodiment, “feature data” refers to data representing the content characteristics of content data. In addition to entity data itself created by software, the data is compressed and converted by compressed data, encrypted data, and one-way functions. This includes data such as the generated hash value.

  In this embodiment, “content data creating means” (FIG. 1b, B2 in FIG. 17) of the terminal device corresponds to step S24 in FIG. “Communication start means” (FIG. 1b, B4 in FIG. 17) corresponds to step S12 in FIG. “Characteristic data transmission means” (FIG. 1b, B6 in FIG. 17) corresponds to step S34 in FIG. The “first time measuring means” (B8 in FIG. 1b) corresponds to steps S18, S20, and S22 in FIG. The “second time measuring means” (B10 in FIG. 1b) corresponds to steps S26, S28, and S32 in FIG. "Measurement time transmission means" (B12 in FIG. 1b) corresponds to step S34 in FIG.

  In this embodiment, “communication start means” (B5 in FIG. 17) of the data creation time certification server 6 corresponds to step S14 in FIG. The “fourth time measuring means” (B14 in FIG. 1b) corresponds to steps S42, S48, and S52 in FIG. “Characteristic data transfer means” (FIG. 1b, B16 in FIG. 17) corresponds to step S40 in FIG. "Time stamp receiving means" (B18 in FIG. 1b and FIG. 17) corresponds to step S48 in FIG. The “third time measuring means” (B20 in FIGS. 2 and 17) corresponds to step S14 in FIG. 7 and S36 in FIG.

  In this embodiment, “data creation time proof generating means” (B22 in FIGS. 2 and 17) corresponds to step S52 in FIG.

  In this embodiment, “time stamp generating means” (B24 in FIGS. 2 and 17) of the time stamp server 8 corresponds to step S44 in FIG. "Time stamp transmission means" (B26 in FIGS. 2 and 17) corresponds to step S46 in FIG.

[System configuration]
FIG. 1a is a diagram showing a configuration of a data creation time certification system according to the present invention. In this embodiment, a case where the user 3 generates a data creation time certificate for content data (image data) of a photograph taken using the mobile phone 2 will be described as an example.

  As shown in FIG. 1a, a data creation time certification system 100 according to the present invention includes a mobile phone 2, which is a terminal device, a data creation time certification server 6, and a time stamp server 8, via the Internet 10 which is a communication line. Connected. The data creation time certification server 6 shown in FIG. 1 a obtains a reliable time (time stamp time) obtained from the time stamp server 8, and the data creation time of the photo data created by the mobile phone 2 based on this time Proof will be generated.

  FIG. 1b is a diagram showing functional means provided in the cellular phone 2, the data creation time certification server 6, and the time stamp server 8 of the data creation time certification system shown in FIG. 1a.

  As shown in FIG. 1b, the terminal device 2 starts the data creation program from the communication start means B4 for starting communication with the data creation time certification server and the communication creation response from the data creation time certification server 6 First time measuring means B8 for measuring the time until the first time as the first time, feature data transmitting means B6 for transmitting at least the feature data of the content data generated by the data creation program to the data creation time certification server, Second time measuring means B10 for measuring the time from the end of the data creation program to the start of transmission by the feature data transmission means as the second time, and the first time and the first time to the data creation time certification server Measurement time transmission means B12 for transmitting the second time.

  In addition, the data creation time certification server 6 measures a time from when the communication start request is received from the terminal device 2 until at least the feature data is received from the terminal device 2 as a third time measurement. Means B20, characteristic data transfer means B16 for transmitting the characteristic data received from the terminal device 2 to the time stamp server 8, and time for receiving the time stamp for the characteristic data transmitted by the characteristic data transfer means B16 from the time stamp server 8. A stamp receiving unit B18, and a fourth time measuring unit B14 that measures a time from when the characteristic data is transmitted to the time stamp server 8 to when the time stamp is received from the time stamp server 8 as a fourth time. ing. Furthermore, the data creation time certification server 6 includes the first time and the second time received from the terminal device 2, the third time measured by the third time measuring means B20, and the following fourth time measurement. Data creation time proof generating means for generating a data creation time proof based on the fourth time measured by the means and the time stamp time received from the time stamp server 8 is also provided.

  Further, the time stamp server 8 includes time stamp generation means B24 for generating a time stamp including the time stamp time for the feature data received from the data creation time certification server 6, and a time for transmitting the time stamp to the data creation time certification server. Stamp transmitting means B26.

[Hardware configuration]
As shown in FIG. 1 a, the mobile phone 2 is a terminal that can be connected to a network 10 such as the Internet via an antenna 5 included in the mobile phone host server 4. FIG. 2 shows a hardware configuration of the mobile phone 2.

  As shown in FIG. 2, the mobile phone 2 includes a CPU 20, a display 22, a flash memory 24, a RAM 26, a camera 27, an input device (input key, cursor key, etc.) 28, a microphone / speaker 29, a communication circuit 30, and a storage media slot. 32, a timer 36, and the like, which are connected via a bus line.

  The flash memory 24 of the mobile phone 2 shown in FIG. 2 stores a data creation program (image creation application) 40 for creating image data captured by the camera 27. Further, the data creation program 40 has a function of acquiring the time measured by the timer 36, and encryption processing and the like are performed so that a third party cannot modify the program. The data creation program 40 can be installed by downloading via the communication circuit 30 or connecting the storage medium 34 to the storage medium slot 32.

  The data creation program (image creation application) 40 also stores the image data captured by the camera 27 in the content data storage DB 42 shown in FIG. FIG. 3 shows a specific example of data stored in the content data storage DB 42. A detailed description of each data item of the content data 001 (type: image) stored when the photograph is taken by the mobile phone 2 shown in FIG. 3 will be described later.

  In the data creation time certification server 6 shown in FIG. 1a, the data creation time certification of the photo data created by the mobile phone 2 is generated based on the reliable time (time stamp time Ts) acquired from the time stamp server 8. .

  Here, the mechanism of the time stamp technology in which the time stamp server 8 shown in FIG. 1a provides a reliable time will be described with reference to FIG.

  As shown in FIG. 4, a time stamp is issued by a time certification authority (TSA) 14 that issues a time stamp token based on an authentication technique such as a public key cryptosystem (PKI), and a standard time distribution authority (time distribution authority (TSA) 14 that distributes and audits time). TA) 12, national time standard time organization (NTA) 16, which is a national organization, and PKI certification authority (CA) are mainly involved. A time stamp server 8, which is a device that issues a time stamp token, is installed in a time certificate authority (TSA) 14. The standard time distribution station (TA) 12 performs accurate time distribution synchronized with the time from the national time standard time agency (NTA) 16 which is a national institution, and the time certification authority (TSA) 14 A time stamp is issued with reference to the time distributed from the distribution station (TA) 12, that is, a time stamp token is generated. The time stamp token is provided from the time stamp server 8 as an electronic signature by adding reliable time information (time stamp time) or the like to the characteristic data of the content data. Note that the PKI certificate authority (CA) 18 shown in FIG. 4 issues a public key certificate for digital signature to the time certificate authority (TSA) 14, so that the time certificate authority (TSA) 14 has a time certification capability. It plays a role to guarantee.

  FIG. 5 shows a hardware configuration of the data creation time certification server 6 (FIG. 1a). As shown in FIG. 5, the data creation time certification server 6 includes a CPU 120, a display 122, a hard disk 125, a RAM 126, an input device (keyboard, mouse, etc.) 128, a communication circuit 130, a clock / timer 135, and a CD-ROM drive 137. These are connected via a bus line. The clock / timer 135 of the data creation time certification server 6 has not only a function for measuring time but also a clock function for providing time.

  As shown in FIG. 5, the data creation time certificate for generating the data creation time certificate is stored in the hard disk 125 of the data creation time certificate server 6 based on the reliable time (time stamp time Ts) acquired from the time stamp server 8. A program 50 is stored. The data creation time certification program 50 can be installed by downloading via the communication circuit 130 or reading the CD-ROM 138 with the CD-ROM drive 137.

  Further, as shown in FIG. 5, the data creation time certification program 50 has a data creation time certification DB 52. In this embodiment, for the sake of explanation, the data creation time certification DB 52 will be described separately as a data creation time calculation table 52a shown in FIG. 6 and a data creation time certification storage table 52b shown in FIG. May be stored integrally or may be stored separately. A detailed description of each data item shown in FIGS. 6 and 9 will be described later.

[Data creation time proof generation process]
7 and 8 are flowcharts showing processing in the data creation time certification system 100 of the present invention. Note that α, β, and γ at the lower end of the flowchart in FIG. 7 are connected to each of the portions α, β, and γ in FIG.

  As shown in FIG. 7, first, the mobile phone 2 determines whether or not there is a standby input (step S10). The standby input refers to, for example, an operation such as pressing a standby button via the input device 28 of the mobile phone 2 performed by the user when considering to acquire time certification for image data to be taken.

  If there is a standby input (Yes in step S10), the mobile phone 2 requests the data creation time certification server 6 to start communication (step S12). The data creation time certification server 4 that has received the communication start request from the mobile phone 2 establishes the communication protocol, acquires the communication start time from the clock / timer 135, and stores it in the data creation time certification DB 52 ( Step S14). For example, as indicated by data1 in FIG. 6, the communication start time is stored as “20060201 15:29:13” for the content data 001.

  When receiving the response (step S16) from the data creation time certification server 6, the CPU 20 of the mobile phone 2 starts measurement by the timer 36 (step S18). Next, when the user 3 presses the button of the input device 28 to start the image creation application, the CPU 20 stops the measurement by the timer 36 (Yes in step S20), and starts image measurement after starting measurement in step S18. The time until the start of the application is completed, that is, the time until the image data can be created is measured as the first time t1 (step S22). Also, the first time t1 is stored in the content data storage DB 42 (step S22). For example, “23” seconds are stored as the first time t1 for the content data 001 shown in FIG. 3 (data2 in FIG. 3). In step S20, the application is manually activated based on the input operation of the user 3, but may be automatically activated based on the standby input in step S10.

  After the image creation application is activated (Yes in step S22), the user presses the shutter button of the input device 28 to actually take a picture, thereby creating content data, adding a file name, and flash memory. 24 is stored in the content data storage DB 42 (step S24). For example, when the user 3 takes a picture using the mobile phone 2, the file name “100106.jpg” is stored for the content data 001 as indicated by data 3 in the content data storage DB 42 of FIG. 3.

  When the photographing is finished, the CPU 20 of the portable terminal 2 determines whether or not the user 3 has pushed the button of the input device 28 and finished the image creation application (step S26). When the image creation application ends (Yes in step S26), the CPU 20 of the portable terminal 2 starts measurement by the timer 36 (step S28). In step S26, the image creation application is manually terminated based on the input operation of the user 3, but may be automatically terminated when content data is created in step S24.

  Thereafter, the CPU 20 of the terminal device 2 calculates the hash value of the content data (step S30), and then stops the measurement by the timer 36, and the time from the start of the measurement in step S28 until immediately before the hash value is transmitted. Is measured as the second time t2 (step S32). Further, the second time t2 is stored in the content data storage DB 42 (step S32). For example, for the content data 001 shown in FIG. 3, “10” seconds are stored as the second time t2 (data5 in FIG. 3). In step S32, the time from the start of measurement in step S28 to just before the hash value is transmitted (hereinafter, step S34) is measured as the second time t2, but the transmission of the hash value is performed. It is also possible to measure the time until the completion of the second time t2. However, in this case, after transmitting the hash value, it is necessary to transmit the second time (data5 in FIG. 3) to the data creation time certification server 6 again.

  The CPU 20 of the terminal device 2 uses the hash value calculated in step S30, the first time t1 (data2 in FIG. 3), the second time t2 (data5 in FIG. 3), and accompanying information (for example, terminal identification ID). Data such as “350111” (see FIG. 1a) is transmitted to the data creation time certification server 6 (step S34).

  As shown in FIG. 8, the CPU 120 of the data creation time certification server 6 first acquires the time at which the hash value was received from the clock / timer 135 and stores it in the data creation time calculation table 52a (step S36). Further, the first time t1 and the second time t2 received from the terminal device 2 are stored in the data creation time calculation table 52a (step S38), and the hash value is sent to the time stamp server 8 to request the issuance of the time stamp. (Step S40). The received hash value is also stored in the data creation time certificate storage table 52b shown in FIG.

  For example, as indicated by data4 in FIGS. 6 and 9, in steps S36 to S40, the content reception time is “20060201 15:29:54” in the data creation time calculation table 52a for the content data 001, the first time. The t1 is stored as “23” seconds, and the second time t2 is stored as “10” (data4, 6 in FIG. 6). Further, the hash is stored as “ihuhh... H84u3” or the like in the data creation time proof storage table 52b (data4 in FIG. 9).

 Further, the CPU 120 of the data creation time certification server 6 starts a timer in order to measure the time until the time stamp is received from the time stamp server 8 (step S42).

  The time stamp server 8 requested to issue a time stamp generates a time stamp token including a reliable time stamp time ts in response to the request (step S44), and transmits the time stamp token to the data creation time certification server 6 (step S44). Step S46).

  When the data creation time certification server 6 receives the time stamp token from the time stamp server 8 (Yes in step S48), the time stamp token is stored in the data creation time calculation table 52a (step S50). Further, the timer is stopped and the time from when the time stamp server 8 is requested to issue the time stamp until the time stamp token is received is measured as the fourth time t4 and stored in the data creation time calculation table 52a. (Step S52).

  For example, as shown in the data creation time calculation table 52a in FIG. 6, the fourth time t4 “12” seconds is stored for the content data 001 (data7 in FIG. 6). For the content data 001, a time stamp token “100106.tst” is stored (data8 in FIG. 6).

  Thereafter, the data creation time certification server 6 performs a process of generating a data creation time certification for the content data (step S54). FIG. 10 is a flowchart showing details of the process of generating the data creation time proof based on the time stamp time Ts (step S54 in FIG. 8).

  As shown in FIG. 10, first, the CPU 120 of the data creation time certification server 6 calculates a third time t and stores it in the data creation time calculation table 52a (step S500). For example, “41” seconds (data 12 in FIG. 6) which is the difference between the communication start time “20060201 15:29:13” and the content reception time “20060201 15:29:54” shown in FIG. 6 is the third time t3. Is calculated and stored.

  Further, based on the read time stamp time Ts, first, a data creation start time Ta is calculated (step S502). The data creation start time calculated here is stored in the data creation time certificate storage table 52b (step S508). Specifically, the data creation start time Ta is calculated by Ta = time stamp time Ts−fourth time t4−third time t3 + first time t1. For example, the time stamp time “20060201 15:30:00” (data 9 in FIG. 6) to “12” seconds (data 7 in FIG. 6) and “41” seconds (data 12 in FIG. 6), the communication start time “ 20060201 15:29:13 ”and the content reception time“ 20060201 15:29:54 ”) are subtracted, and“ 23 ”seconds (first time t1 in FIG. 3) seconds are added. The time “20060201 15:29:50” is calculated as the data creation start time Tb.

  Similarly, a data creation end time Tb is calculated based on the time stamp time Ts (step S506), and the calculated data creation end time Tb is stored in the data creation time certification storage table 52b shown in FIG. 9 (step S506). S508). FIG. 9 shows an example of data stored in the data creation time certificate storage table 52b. Specifically, the data creation end time Tb is calculated by the formula Tb = time stamp time Ts−second time t2. For example, the time “20060201 15:29:50” obtained by subtracting “10” seconds (data6 in FIG. 6) from the time stamp time “20060201 15:30:00” (data9 in FIG. 6) shown in FIG. 6 is created. It is calculated as the end time and stored in the data creation time certification storage table 52b (data10 in FIG. 9).

  FIG. 11A shows a time table for calculating the data creation start time Ta and the data creation start time Tb calculated as described above. As shown in FIG. 11a, the data creation start time Ta constituting the data creation time certification is represented by a time stamp time Ts and arrows t4, t3, and t1. The data creation start time Ta constituting the data creation time certification is represented by a time stamp time Ts and an arrow t2. That is, the data creation time certification (FIG. 9) proves that the content data has been created between the data creation start time Ta and the data creation start time Tb shown in FIG. 11a.

  FIG. 11b is a diagram in which the time table shown in FIG. 11a is displayed on the flowcharts shown in FIGS. As shown in FIG. 11b, the timing for ending the measurement of the second time t2 (the start point of the arrow t2 shown in FIG. 11a) is when the hash value upload is started (step S34 in FIG. 8), and thereafter The time stamp time Ts issued at the time actually has a time lag Δt2. That is, the calculated data creation end time Tb (= Ts−t2) is calculated so that the time lag Δt2 is delayed. Thereby, it can be proved that the application is ended at least before the data creation end time Tb.

  Similarly, the timing for ending the measurement of the fourth time t4 (the start point of the arrow t4 shown in FIG. 11a) is when the data creation time certification server 6 has completed receiving the time stamp (steps S48 and S52 in FIG. 8). The time stamp time Ts issued at the previous time and the time lag Δt1 actually occur. That is, the calculated data creation start time Ta (= Ts−t4−t3 + t1) is calculated so that the time lag Δt1 is earlier. Thereby, it can be proved that the application is started at least after the data creation end time Tb.

  After the data creation time proof is generated in step S54, the data creation time proof server 6 further generates a content ID and a verification code, stores them in the data creation time proof storage table 52b, and stores these data as proof completion data. Is transmitted to the mobile phone 2 (step S56, data13 in FIG. 9). This “certification completion data” includes, in addition to a message indicating completion of certification, supplementary information such as a content ID as necessary. The verification code can be generated by generating a random number, for example.

  The mobile phone 2 stores the content ID and verification code received from the data creation time certification server 6 in the content data storage DB 42 (step S58). For example, as indicated by data 14 in FIG. 3, a verification code “12345678” and a content ID “100106” are stored for the content data 001.

  Further, the cellular phone 2 combines the data in the content data storage DB 42 to generate an electronic certificate X (certified content data) as shown in FIG. 12 (step S59). The content ID is used to search for a data creation time certificate at the time of verification described below, and the verification code is used as a password when a third party views the data creation time certificate. become.

  FIG. 12 shows a display example of the electronic certificate X synthesized from the data stored in the data creation time certificate storage table 52b shown in FIG. The third party can obtain the electronic certificate X by receiving the data of the electronic certificate X from the mobile phone 2 of the user 3 who owns the mobile phone 2 that generated the electronic certificate X, for example. it can.

  The third party who acquired the data of the electronic certificate X reads the electronic certificate X as shown in FIG. 12 and displays it on the computer, so that the contents P of the image data and the creation time (creation start time) of the image data are displayed. Ta to creation end time Tb) and accompanying information D (whether or not falsification or verification code, etc.) can be known.

  For example, from the electronic certificate X shown in FIG. 12, the persons H1 and H2 shown in the image P are placed in front of the building B from “February 1, 2006 15:29:30” to “February 1, 2006 15 : 29: 50 "can be known. Further, when it is desired to confirm the validity of the information known from the electronic certificate X, it is possible to verify whether or not the electronic certificate X has been falsified in the data creation time certification server 6, as will be described later. .

[Verification process using data creation time proof]
A verification process performed on the content data using the data creation time certificate will be described with reference to FIGS.

  First, verification processing in the case where the verifier has photo image data will be described with reference to FIGS. 13 and 14. FIG. 13 is a diagram showing a system configuration at the time of verification. FIG. 14 is a flowchart illustrating processing when a verifier having image data of a photo verifies from the terminal device 2a.

  In this embodiment, as a premise of verification, as shown in FIG. 13, the verifier 7 a receives at least image data from the user 3 and data necessary for verification (content ID, verification code, data creation time certification for performing verification work). It is assumed that the storage medium 34 storing the URL for connecting to the server 6 is received and verified from the terminal device (client PC 2a) connected to the data creation time certification server 6. The client PC 2a can be connected to the network 10 via the Internet connection server 4a as shown in FIG.

  As shown in FIG. 14, the verifier 7a first inserts the storage medium 34 into the client PC 2a, reads the image ID and the image data, and transmits them to the data creation time certification server 6 (step S60). In the case where the data creation time certificate is searched from the image data in the following step S64, only the image data can be transmitted here.

  The data creation time certification server 6 that has received the image ID and the image data from the client PC 2a calculates a hash value from the received image data (step S62), and further searches the data creation time certification from the image ID (step S64). .

  The data creation time certification server 6 compares the hash value calculated from the received image data with the hash value stored in the retrieved data creation time certification, and transmits the verification result (step S68). On the client PC 2a, the received verification result and data creation time proof are displayed (step S70). For example, if the hash values are different in step S68, a display indicating that the image has been tampered is displayed in the accompanying information D of the data creation time certificate shown in FIG.

  Thereby, the verifier can confirm the reliable time considered that the image was taken together with the presence or absence of falsification of the image data.

  Next, the case of a verifier who does not have image data will be described with reference to FIGS. 15 and 16. FIG. 15 is a diagram showing a system configuration at the time of verification. FIG. 16 is a flowchart showing processing when a verifier who does not have photo image data performs verification from the terminal device (client PC 2b).

  As shown in FIG. 15, in this embodiment, the verifier 7b receives the printout 60 on which the photograph, the image ID, and the verification code are printed from the user 3 shown in FIG. 1a, and sends the client PC 2b via the Internet connection server 4b. Will be used for verification.

  Note that, as in this embodiment, when there is no photo image data, a verification code is requested. This is because a person who is not authorized in the verification of only the image ID can also browse.

  As shown in FIG. 16, first, an image ID and a verification code are transmitted from the client PC 2b (step S80). The data creation time certification server 6 searches for the data creation time certification from the received image ID (step S82), and transmits the search result to the terminal device if the verification codes match (step S84). The client PC 2b displays a data creation time certificate as shown in FIG. 12 as the received verification result (step S86).

  Thereby, the verifier 7b can confirm the reliable time when the printed photograph is considered to be taken. However, in this verification method, the verifier 7b cannot know whether the image data has been tampered with.

[Other embodiments]
In the above embodiment, the data creation time certificate is generated based on the time stamp time Ts in consideration of all of the first time t1, the second time t2, and the fourth time t4. It is also possible to generate the data creation time certificate based on the time stamp time Ts considering only the time t3 of 3. In this case, the time stamp time Ts is the data creation end time Tb, and the data creation start time Ta is obtained by subtracting the third time t3 from the time stamp time Ts. In addition to the third time t3, the data creation time proof may be generated based on the time stamp time Ts by combining the first time t1, the second time t2, and the fourth time t4.

  FIG. 17 shows functional units provided in the mobile phone 2, the data creation time certification server 6, and the time stamp server 8 when the data creation time certification is generated based on the timestamp time Ts considering only the third time t 3. FIG.

  As shown in FIG. 17, the terminal device 2 creates communication start means B4 for starting communication with the data creation time certification server 6, content data creation means B2 for creating content data, and feature data of content data. , Feature data transmission means for transmitting the feature data of the created content data to the data creation time certification server 6 and B6.

  In addition, the time stamp server 8 shown in FIG. 17 receives a request from the data creation time certification server 6 and generates a time stamp generation unit B24 that generates a time stamp including the time stamp time. Time stamp transmission means B26 for transmitting the stamp.

  Furthermore, the data creation time certification server 6 shown in FIG. 17 receives the feature data from the communication start means B5 for starting communication with the terminal device 2 and the terminal device 2, and transfers the feature data to the time stamp server 8. The transfer means B16, the time stamp receiving means B18 for receiving a time stamp from the time stamp server 8, and the communication start related time at the start of communication by the communication start means 5, the characteristic data transfer means B16 related at the time of receiving characteristic data. A third time measuring means B20 that measures the time until the feature data generation related time as a third time, and a time after the time obtained by subtracting the third time from the time stamp time by the received time stamp is the data creation start time And the time before the time stamp and after the data creation start time And a data creation time certification generating unit B22 for generating data creation proof was. Note that the “communication start related time” is, for example, after the communication start request from the terminal device 2 and before the response from the data creation time certification server 6 to the communication start request from the terminal device 2 Any time between. The “related to feature data generation” is, for example, any time after the time when the feature data is generated by the terminal device 2 and before the time stamp request to the time stamp server 8 is made.

  In the above embodiment, as shown in FIG. 1a, the data creation time certification server 6 and the time stamp server 8 are provided independently. However, the data creation time certification server 6 is provided with the function of the time stamp server 8. It can also be realized by one server. As described above, when the data creation time certification server 6 has the function of the time stamp server 8, it is not necessary to measure the fourth time as in the above embodiment (time stamp generation processing in the one server). Although the time from the start to the end can be measured as the fourth time), the data creation time proof can be generated without taking the fourth time into account.

  In the above embodiment, the verifier requests the data creation time certification for the content data from the data creation time certification server 6 shown in FIG. 1a, but the data creation time certification storage table shown in FIG. A verification server storing 52b may be separately provided, and a data creation time certificate may be requested from the server.

  In the above embodiment, when the data creation end time Tb is calculated based on the time stamp time Ts (step S506), the third time t3 (data 12 in FIG. 6) is stored using the clock function. Although it is obtained from the difference between the start time and the content reception time, it may be obtained by measuring using a timer function by starting the timer measurement at the communication start time, ending the timer measurement at the content reception time.

  In the above embodiment, the time for starting the second time measurement is set to the end of the data generation program (steps S26 and S28 in FIG. 7), but at the end of the generation of content data (step S24 in FIG. 7). ).

  In the above embodiment, the case where there is one content data created by the data generation program has been described, but a plurality of content data may exist. Alternatively, the measurement may be started from the completion of the generation of each content data for creating a plurality of second time measurements (step S24 in FIG. 7). Thereby, it is possible to measure the second time for each content data.

  In the above embodiment, the identification information of the terminal device is transmitted as accompanying information together with the hash value from the mobile phone 2 to the data creation time certification server 6 (step S34 in FIG. 7). You may make it transmit.

  In the above embodiment, the terminal device identification information is transmitted from the mobile phone 2 to the data creation time certification server 6 as supplementary information together with the hash value (step S34 in FIG. 7). It is not necessary to send information.

  In the above embodiment, the identification information of the terminal device is transmitted from the mobile phone 2 to the data creation time certification server 6 as supplementary information together with the hash value (step S34 in FIG. 7). Information may be transmitted as incidental information.

  In the above embodiment, the mobile phone 2 is used as the terminal device. However, any terminal that can create content data may be used, and a client that can connect to the Internet 10 via the Internet connection server 4b shown in FIG. A terminal (not shown) such as the PC 2b, PDA, or recorder may be used as the terminal device.

  In the above-described embodiment, the content data is image data, but other data such as moving images, sounds, and sentences may be used as content data. Further, although the data creation program 40 is an application (image creation application) having an image creation function, an application having a moving image creation function, a sentence creation function, and a recording function may be used as the data creation program.

  For example, when the content data is moving image data, from the reception of the response (corresponding to step S16 shown in FIG. 7) from the data creation time certification server 6 until the start of the image creation application is completed (step shown in FIG. 7). The time corresponding to S20 may be measured as the first time t1. Further, the time from the end of the moving image creation application (corresponding to step S26 shown in FIG. 7) to the start of transmission (upload) of the hash value may be measured as the second time t2. In addition, when the content data is data such as sound and text, it can be handled basically in the same manner.

  However, if the content data is a sentence, it often takes a long time to start creating the sentence once the sentence creation application is started. Therefore, if the same processing is performed as described above, the measurement of the first time t1 is completed. It is also conceivable that the interval between the measurement start time and the first time t2 is more than necessary. For this reason, when the content data is a sentence, processing after the response from the data creation time certification server 6 (corresponding to step S16 shown in FIG. 7) is received and the activation of the sentence creation application is completed. For example, the time until the file overwrite saving process is completed or the printout process is completed (corresponding to step S20 shown in FIG. 7) may be measured as the first time t1.

  The present invention can also be used to prove the date and time when performing specific processing on content data (for example, when a document generated by word processing software or the like is converted to PDF). For example, when the terminal device performs PDF conversion processing in the above embodiment, conversion processing to a PDF document (creation instruction) after receiving a response (corresponding to step S16 shown in FIG. 7) from the data creation time certification server 6 The time until input is performed (corresponding to step S20 shown in FIG. 7) may be measured as the first time t1. Also, from the time when conversion processing to a PDF document is completed (that is, when the CPU determines that a data file such as PDF has been created) (corresponding to step S26 shown in FIG. 7), transmission of a hash value (upload). What is necessary is just to measure time until it starts as 2nd time t2.

  Note that the method of stopping the measurement of the first time t1 by the creation instruction input and starting the measurement of the second time t2 by the end of the creation process as described above is not limited to the PDF document, but to other content data. Can also be used. For example, when taking a picture as in the above-described embodiment, the measurement of the first time t1 is stopped when the user presses the shooting key, and the second time when the shot image data is generated. You may make it start the measurement of time t2.

  In the above embodiment, as shown in FIG. 2, the data creation program 40 is stored in the flash memory 24. However, in order to prevent external control and to make sure that content data cannot be modified. Alternatively, the data creation program 40 may be configured as a dedicated module and mounted on the portable terminal. The same applies to the creation time certification program stored in the data hard disk 25 (FIG. 5) of the data creation time certification server 6.

It is a figure which shows the structure of the data creation time proof system of this invention. It is a figure which shows the function means in the data creation time proof system of this invention. 2 is a diagram showing a hardware configuration of a mobile phone 2. FIG. It is a figure which shows the specific example of the content data memorize | stored in content data storage DB42. It is a figure which shows the structure of the time stamp technique in which the time stamp server 8 provides the reliable time. 2 is a diagram illustrating a hardware configuration of a data creation time certification server 6. FIG. It is a figure which shows the specific example of the data memorize | stored in data creation time certification DB34. It is a figure which shows the flowchart of the process in the data creation time proof system 100 of this invention. It is a figure which shows the flowchart of the process in the data creation time proof system 100 of this invention. It is a figure which shows the data structure of data creation time certification. It is a flowchart which shows the detail of the process (step S50 of FIG. 8) which produces | generates data creation time proof. It is a figure which shows the time table of data creation start time Ta and data creation start time Tb. It is a figure which shows the time table of data creation start time Ta and data creation start time Tb in the flowchart of FIG. 7 and FIG. It is a figure which shows the example of a display of data creation time proof. It is a figure which shows the system configuration | structure at the time of verification. It is a flowchart which shows a process in case the verifier who has image data verifies from a terminal device. It is a figure which shows the system configuration | structure at the time of verification. It is a flowchart which shows a process in case the verifier who does not have image data verifies from a terminal device. It is a figure which shows the function means in the data creation time proof system of this invention.

Explanation of symbols

2 ... Terminal device 6 ... Data creation time certification server 8 ... Time stamp server 10 ... Network

Claims (25)

A data creation time certification system in which a terminal device provided with a data creation program, a data creation time certification server, and a time stamp server that issues a time stamp are connected via a network,
The terminal device is
Communication start means for starting communication with the data creation time certification server;
First time measuring means for measuring, as a first time, a time from when a communication start response is received from the data creation time certification server to when the data creation program is activated;
Feature data transmission means for transmitting at least feature data of content data generated by the data creation program to the data creation time certification server,
Second time measuring means for measuring the time from the end of the data creation program to the start of transmission by the feature data transmitting means as the second time;
A measurement time transmitting means for transmitting the first time and the second time to a data creation time certification server;
With
The data creation time certification server is
Third time measuring means for measuring, as a third time, a time from when the communication start request is received from the terminal device to at least receiving the feature data from the terminal device;
Feature data transfer means for transmitting feature data received from the terminal device to a time stamp server;
A time stamp receiving means for receiving a time stamp for the characteristic data transmitted by the characteristic data transferring means from the time stamp server;
A fourth time measuring means for measuring a time from when the characteristic data is transmitted to the time stamp server until the time stamp is received from the time stamp server as a fourth time;
With
The time stamp server is
Time stamp generating means for generating a time stamp including a time stamp time for the feature data received from the data creation time certification server,
A time stamp transmitting means for transmitting a time stamp to the data creation time certification server;
In the data creation time certification system with
The data creation time certification server is
A first time and a second time received from the terminal device; a third time measured by the third time measuring means; a fourth time measured by the fourth time measuring means; Data creation time proof generating means for generating a data creation time proof based on the time stamp time received from the time stamp server;
With
This is a data creation time certification system. A data creation time certification server connected via a network to a terminal device provided with a data creation program and a time stamp server that issues a time stamp,
Third time measuring means for measuring, as a third time, a time from when the communication start request is received from the terminal device to at least receiving the feature data from the terminal device;
Measuring time receiving means for receiving the first and second times measured by the terminal device;
Feature data transfer means for transmitting feature data received from the terminal device to a time stamp server;
A time stamp receiving means for receiving a time stamp for the characteristic data transmitted by the characteristic data transferring means from the time stamp server;
A fourth time measuring means for measuring a time from when the characteristic data is transmitted to the time stamp server until the time stamp is received from the time stamp server as a fourth time;
A first time and a second time received from the terminal device; a third time measured by the third time measuring means; a fourth time measured by the fourth time measuring means; Data creation time proof generating means for generating a data creation time proof based on the time stamp time received from the time stamp server;
With
A data creation time certification server. A program for realizing a data creation time certification server connected via a network to a terminal device having a data creation program, a time stamp server for issuing a time stamp, and using a computer,
Third time measuring means for measuring, as a third time, a time from when the communication start request is received from the terminal device to at least receiving the feature data from the terminal device;
Measuring time receiving means for receiving the first and second times measured by the terminal device;
Feature data transfer means for transmitting feature data received from the terminal device to a time stamp server;
A time stamp receiving means for receiving a time stamp for the characteristic data transmitted by the characteristic data transferring means from the time stamp server;
A fourth time measuring means for measuring a time from when the characteristic data is transmitted to the time stamp server until the time stamp is received from the time stamp server as a fourth time;
A first time and a second time received from the terminal device; a third time measured by the third time measuring means; a fourth time measured by the fourth time measuring means; Data creation time proof generating means for generating a data creation time proof based on the time stamp time received from the time stamp server;
A program characterized by comprising: A terminal device having a data creation program connected to a data creation time certification server and a time stamp server that issues a time stamp via a network,
Communication start means for starting communication with the data creation time certification server;
First time measuring means for measuring, as a first time, a time from when a communication start response is received from the data creation time certification server to when the data creation program is activated;
Feature data transmission means for transmitting at least feature data of content data generated by the data creation program to the data creation time certification server,
Second time measuring means for measuring the time from the end of the data creation program to the start of transmission by the feature data transmitting means as the second time;
A measurement time transmitting means for transmitting the first time and the second time to a data creation time certification server;
With
A terminal device characterized by that. A program for realizing, using a computer, a terminal device provided with a data creation program, connected to a data creation time certification server and a time stamp server that issues a time stamp via a network,
Communication start means for starting communication with the data creation time certification server;
First time measuring means for measuring, as a first time, a time from when a communication start response is received from the data creation time certification server to when the data creation program is activated;
Feature data transmission means for transmitting at least feature data of content data generated by the data creation program to the data creation time certification server,
Second time measuring means for measuring the time from the end of the data creation program to the start of transmission by the feature data transmitting means as the second time;
A measurement time transmitting means for transmitting the first time and the second time to a data creation time certification server;
A program characterized by comprising: In the system, server, terminal device or program according to any one of claims 1 to 5,
The data creation time is composed of a data creation start time and a data creation end time,
The data creation time proof generating means is
The data creation start time is calculated by subtracting the third time and the fourth time from the time stamp time, and further adding the first time,
Calculating the data creation end time by subtracting a second time from the time stamp time;
It is characterized by that. In the system, server, terminal device or program according to any one of claims 1 to 6,
The measurement of the second time is started when the process of creating the content data is performed by the data creation program.
It is characterized by that. In the system, server, terminal device or program of claim 7,
There are a plurality of content data generated by the data creation program,
The second time measuring means measures, for each content data, the time from when the data creation program created each content data until the start of transmission by the feature data transmitting means as the second time.
It is characterized by that. In the system, server, terminal device or program according to any one of claims 1 to 8,
The feature data transmission means transmits only the feature data of the content data generated by the data creation program to the data creation time certification server;
It is characterized by that. In the system, server, terminal device or program according to any one of claims 1 to 8,
The feature data transmitting means transmits an identification number of the terminal device together with the feature data;
It is characterized by that. In the system, server, terminal device or program according to any one of claims 1 to 8,
The feature data transmitting means transmits location information of the terminal device together with the feature data;
It is characterized by that. Communication start means for starting communication with the data creation time certification server;
First time measuring means for measuring, as a first time, a time from when a communication start response is received from the data creation time certification server to when the data creation program is activated;
Feature data transmission means for transmitting at least feature data of content data generated by the data creation program to the data creation time certification server,
Second time measuring means for measuring the time from the end of the data creation program to the start of transmission by the feature data transmitting means as the second time;
A measurement time transmitting means for transmitting the first time and the second time to a data creation time certification server;
A data creation time certification server connected via a network to a terminal device equipped with a data creation program,
The data creation time certification server is
Third time measuring means for measuring, as a third time, a time from when the communication start request is received from the terminal device to at least receiving the feature data from the terminal device;
Time stamp generation means for generating a time stamp including a time stamp time for the feature data received from the terminal device,
Data creation based on the first time and the second time received from the terminal device, the third time measured by the third time measuring means, and the time stamp time received from the time stamp server Data creation time proof generating means for generating time proof,
With
A data creation time certification server. A data creation time certification system in which a terminal device having a content data creation function, a data creation time certification server, and a time stamp server that issues a time stamp are connected via a network,
The terminal device
Communication start means for starting communication with the data creation time certification server;
Content data creation means for creating content data;
Feature data transmission means for creating feature data of the content data and transmitting the created feature data of the content data to the data creation time certification server;
The timestamp server is
A time stamp generating means for receiving a request from the data creation time certification server and generating a time stamp including a time stamp time;
A time stamp transmitting means for transmitting a time stamp to the data creation time certification server,
The data creation time certification server is:
Communication starting means for starting communication with the terminal device;
Feature data transfer means for receiving feature data from the terminal device and transferring it to the time stamp server;
A time stamp receiving means for receiving a time stamp from a time stamp server;
A third time measuring means for measuring, as a third time, a time from a communication start related time related to the start of communication by the communication start means to a feature data generation related time related to the feature data reception by the feature data transfer means;
Data with the time after the time obtained by subtracting the third time from the time stamp time by the received time stamp as the data creation start time, and with the time before the time stamp time and after the data creation start time as the data creation end time A data creation time certificate generating means for generating a creation time certificate;
A data creation time certification system characterized by comprising: A data creation time certification server connected via a network to a terminal device having a content data creation function and a time stamp server that issues a time stamp,
Communication starting means for starting communication with the terminal device;
Feature data transfer means for receiving feature data from the terminal device and transferring it to the time stamp server;
A time stamp receiving means for receiving a time stamp from a time stamp server;
A third time measuring means for measuring, as a third time, a time from a communication start related time related to the start of communication by the communication start means to a feature data generation related time related to the feature data reception by the feature data transfer means;
Data with the time after the time obtained by subtracting the third time from the time stamp time by the received time stamp as the data creation start time, and with the time before the time stamp time and after the data creation start time as the data creation end time A data creation time certificate generating means for generating a creation time certificate;
A data creation time certification server characterized by comprising: A program for realizing a data creation time certification server connected via a network to a terminal device having a content data creation function, a time stamp server for issuing a time stamp, and using a computer,
Communication starting means for starting communication with the terminal device;
Feature data transfer means for receiving feature data from the terminal device and transferring it to the time stamp server;
A time stamp receiving means for receiving a time stamp from a time stamp server;
A third time measuring means for measuring, as a third time, a time from a communication start related time related to the start of communication by the communication start means to a feature data generation related time related to the feature data reception by the feature data transfer means;
Data with the time after the time obtained by subtracting the third time from the time stamp time by the received time stamp as the data creation start time, and with the time before the time stamp time and after the data creation start time as the data creation end time A data creation time certificate generating means for generating a creation time certificate;
A program characterized by comprising: In the system, server, terminal device or program according to any one of claims 13 to 15,
The communication start related time is after the communication start request from the terminal device and before the response to the communication start request from the terminal device. In the system, server, terminal device or program according to any one of claims 13 to 16,
The feature data generation related time is after the feature data generation time by the terminal device and before the time stamp request to the time stamp server. In the system, server, terminal device or program according to any one of claims 13 to 17,
The terminal device
First time measuring means for measuring, as a first time, a time from when the communication start is related to when the data creating means can create content data;
A measurement time transmitting means for transmitting the first time to a data creation time certification server;
The data creation time certification generating means of the data creation time certification server subtracts the third time from the time stamp time and sets the time obtained by adding the first time as the data creation start time. In the system, server, terminal device or program according to any one of claims 13 to 18,
The terminal device
A second time measuring means for measuring the time from when the data creating means completes the creation of the content data to when the feature data is related to the second time,
A measurement time transmitting means for transmitting the second time to the data creation time certification server;
The data creation time certification generating means of the data creation time certification server uses a time obtained by subtracting a second time from the time stamp time as a data creation end time. In the system, server, terminal device or program according to any one of claims 13 to 19,
The data creation time certification server is:
A fourth time measuring means for measuring a time from when the time stamp receiving means makes a request until the time stamp is received as a fourth time;
The data creation time certification generating means subtracts a fourth time from the calculated data creation start time to obtain a data creation start time. The system, server, terminal device or program according to any one of claims 13 to 20,
The data creation certification server
Providing proof completion data transmitting means for transmitting proof completion data to the terminal device when generating the data creation time proof,
The terminal device
A certified content data generating means for generating certified content data by synthesizing the received certification completion data and content data. A data creation time certification method in which a terminal device provided with a data creation program, a data creation time certification server, and a time stamp server that issues a time stamp are connected via a network,
The terminal device is
A communication start step for starting communication with the data creation time certification server;
A first time measurement step of measuring, as a first time, a time from when a communication start response is received from the data creation time certification server to when the data creation program is activated;
A feature data transmission step of transmitting at least the feature data of the content data generated by the data creation program to the data creation time certification server;
A second time measuring step of measuring, as a second time, a time from the end of the data creation program to the start of transmission in the feature data transmission step;
A measurement time transmission step of transmitting the first time and the second time to a data creation time certification server;
With
The data creation time certification server is
A third time measuring step of measuring, as a third time, a time from when a communication start request is received from the terminal device to at least receiving feature data from the terminal device;
A feature data transfer step of transmitting the feature data received from the terminal device to a time stamp server;
A time stamp receiving step of receiving a time stamp for the feature data transmitted by the feature data transfer means from the time stamp server;
A fourth time measuring step of measuring a time from when the characteristic data is transmitted to the time stamp server until the time stamp is received from the time stamp server as a fourth time;
With
The time stamp server is
A time stamp generating step for generating a time stamp including a time stamp time for the feature data received from the data creation time certification server;
A time stamp transmission step of transmitting a time stamp to the data creation time certification server;
In the data creation time certification method with
The data creation time certification server is
A first time and a second time received from the terminal device; a third time measured by the third time measuring means; a fourth time measured in the fourth time measuring step; A data creation time certificate generation step for generating a data creation time certificate based on the timestamp time received from the timestamp server;
With
A data creation time certification method characterized by that. A data creation time certification method in which a terminal device having a content data creation function, a data creation time certification server, and a time stamp server that issues a time stamp are connected via a network,
The terminal device is
A communication start step for starting communication with the data creation time certification server;
A content data creation step for creating content data;
Creating feature data of the content data, and sending the created feature data of the content data to the data creation time certification server,
The timestamp server is
In response to a request from the data creation time certification server, a time stamp generation step for generating a time stamp including a time stamp time;
A time stamp transmission step of transmitting a time stamp to the data creation time certification server,
The data creation time certification server is:
A communication start step for starting communication with the terminal device;
A feature data transfer step of receiving feature data from the terminal device and transferring the feature data to a time stamp server;
A time stamp receiving step of receiving a time stamp from the time stamp server;
A third time measuring step for measuring, as a third time, a time from a communication start related time related to the start of communication by the communication start step to a feature data generation related time related to the feature data reception by the feature data receiving step;
Data with the time after the time obtained by subtracting the third time from the time stamp time by the received time stamp as the data creation start time, and with the time before the time stamp time and after the data creation start time as the data creation end time A data creation time certificate generation step for generating a creation time certificate;
A data creation time certification method characterized by comprising: A data creation time certification verification system in which a terminal device provided with a data creation program, a data creation time certification server, a time stamp server that issues a time stamp, and a data creation time validation terminal are connected via a network. ,
The terminal device is
Communication start means for starting communication with the data creation time certification server;
First time measuring means for measuring, as a first time, a time from when a communication start response is received from the data creation time certification server to when the data creation program is activated;
Feature data transmission means for transmitting at least feature data of content data generated by the data creation program to the data creation time certification server,
Second time measuring means for measuring the time from the end of the data creation program to the start of transmission by the feature data transmitting means as the second time;
A measurement time transmitting means for transmitting the first time and the second time to a data creation time certification server;
With
The data creation time certification server is
Third time measuring means for measuring, as a third time, a time from when the communication start request is received from the terminal device to at least receiving the feature data from the terminal device;
Feature data transfer means for transmitting feature data received from the terminal device to a time stamp server;
A time stamp receiving means for receiving a time stamp for the characteristic data transmitted by the characteristic data transferring means from the time stamp server;
A fourth time measuring means for measuring a time from when the characteristic data is transmitted to the time stamp server until the time stamp is received from the time stamp server as a fourth time;
A first time and a second time received from the terminal device; a third time measured by the third time measuring means; a fourth time measured by the fourth time measuring means; Data creation time proof generating means for generating a data creation time proof based on the time stamp time received from the time stamp server;
With
The time stamp server is
Time stamp generating means for generating a time stamp including a time stamp time for the feature data received from the data creation time certification server,
A time stamp transmitting means for transmitting a time stamp to the data creation time certification server;
In the data creation time certification verification system with
The data creation time verification terminal is
Content data transmitting means for transmitting at least content data to the data creation time certification server;
Verification result display means for displaying the verification result received from the data creation time certification server;
With
The data creation time certification server is
Feature data verification means for calculating feature data from the content data received from the data creation time certification verification terminal and comparing and comparing with the feature data of the data creation time certification;
Verification result transmission means for transmitting the result of comparing the feature data to the data creation time verification terminal together with the data creation time proof,
With
A data creation time proof verification system characterized by that. A data creation time certification verification system in which a terminal device provided with a data creation program, a data creation time certification server, a time stamp server that issues a time stamp, and a data creation time validation terminal are connected via a network. ,
The terminal device
Communication start means for starting communication with the data creation time certification server;
Content data creation means for creating content data;
Feature data transmission means for creating feature data of the content data and transmitting the created feature data of the content data to the data creation time certification server;
The timestamp server is
A time stamp generating means for receiving a request from the data creation time certification server and generating a time stamp including a time stamp time;
A time stamp transmitting means for transmitting a time stamp to the data creation time certification server,
The data creation time certification server is:
Communication starting means for starting communication with the terminal device;
Feature data receiving means for receiving feature data from the terminal device;
Time stamp receiving means for making a time stamp request to the time stamp server and receiving the time stamp for the received feature data;
A third time measuring means for measuring, as a third time, a time from a communication start related time related to the start of communication by the communication start means to a feature data generation related time related to the feature data reception by the feature data transfer means;
Data with the time after the time obtained by subtracting the third time from the time stamp time by the received time stamp as the data creation start time, and with the time before the time stamp time and after the data creation start time as the data creation end time In a data creation time proof verification system comprising a data creation time proof generating means for generating a creation time proof,
The data creation time certification server is
Feature data verification means for calculating feature data from the content data received from the data creation time certification verification terminal and comparing and comparing with the feature data of the data creation time certification;
Verification result transmission means for transmitting the result of comparing the feature data to the data creation time verification terminal together with the data creation time proof,
With
A data creation time proof verification system characterized by that.

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